Hitachi UTOPIA RAS-4HVRP2E Service Manual
  1. Manuals
  2. Brands
  3. Hitachi Manuals
  4. Air Conditioner
  5. RAS-4HVRP2E
  6. Service manual

Hitachi UTOPIA RAS-4HVRP2E Service Manual

Hide thumbs Also See for UTOPIA RAS-4HVRP2E:
Table of Contents

Advertisement

Quick Links

–
SERVICE
MANUAL
–
UTOPIA
R32 SERIES
R410A SERIES
MODELS
RAS-3HVRC2
RAS-(4-6)H(V)RC2E - RAS-(4-6)H(V)RP2E
RAS-(4-6)H(V)NC2E - RAS-(4-6)H(V)NP2E
SMGB0136 rev.0 - 07/2021

Advertisement

Table of Contents
loading

Related Manuals for Hitachi UTOPIA RAS-4HVRP2E

Summary of Contents for Hitachi UTOPIA RAS-4HVRP2E

  • Page 1 – SERVICE MANUAL – UTOPIA R32 SERIES R410A SERIES MODELS RAS-3HVRC2 RAS-(4-6)H(V)RC2E - RAS-(4-6)H(V)RP2E RAS-(4-6)H(V)NC2E - RAS-(4-6)H(V)NP2E SMGB0136 rev.0 - 07/2021...
  • Page 3 Contents C o n t e n t s General Information Optional parts and installation Piping work and refrigerant charge Electrical and control settings Control System Optional functions Commissioning Electrical checks of main parts Servicing Troubleshooting Maintenance notes SMGB0136 rev.0 - 07/2021...

  • Page 5: Table Of Contents

    General Index General Information ....................11 General information ..........................12 1.1.1 Introduction ..............................12 Applied symbols ............................ 13 Norms and Regulations ......................... 13 Product guide ............................14 1.4.1  Classification of outdoor unit models ......................14 1.4.2  Classification of indoor unit models ....................... 14 1.4.3 Product line-up: Outdoor units ........................15 1.4.4 Outdoor unit accessory code list ........................
  • Page 6 Piping work and refrigerant charge ............... 41 General notes before performing pipe work ..................42 3.1.1 Piping Materials ............................. 42 3.1.2 Three principles on refrigerant piping work ....................44 3.1.3 Suspension of refrigerant piping ........................44 3.1.4 Brazing work ..............................45 Piping connection for outdoor unit ......................
  • Page 7 Control System ......................79 Device control system ........................... 80 5.1.1 RAS-3HVRC2 ..............................80 5.1.2 RAS-(4-6)H(V)(R/N)(C/P)2E ......................... 81 5.1.3 Outline of the control system ......................... 82 Outdoor units Printed circuit board (PCB) ..................... 84 5.2.1 RAS-3HVRC2 ..............................84 5.2.2 RAS-(4-6)H(V)(R/N)(P/C)2E ......................... 85 5.2.2.1 RAS-(4-6)HV(R/N)(C/P)2E (PCB1) ....................
  • Page 8 6.1.3.5 Cancellation of the outdoor ambient temperature limit (GS) ............116 6.1.3.6 Change of defrost condition (Jo) ....................117 6.1.3.7 SLo defrost setting (bJ) ........................118 6.1.3.8 Priority capacity mode setting (nU) ....................118 6.1.3.9 Priority Cooling Capacity mode (Hc) ....................118 6.1.3.10 Priority Heating Capacity mode (Hh) ....................118 6.1.3.11 Change the opening degree of the Expansion Valve (Si) ............118 6.1.3.12 ...
  • Page 9 6.2.4 Power saving function from wired controller ....................140 6.2.4.1 Power Saving Guide ........................140 6.2.4.2 Outdoor Unit Capacity Control ....................... 140 6.2.4.3 Rotation control function ........................ 141 6.2.4.4 Intermittent control function ......................141 6.2.4.5  Power Saving Schedule Function ....................142 6.2.4.6 Operation noise reduction schedule function ................. 142 6.2.4.7 ...
  • Page 10 Servicing ......................... 175 Safety Introduction ..........................176 RAS-3HVRC2............................177 9.2.1 Removing the pipe cover ..........................177 9.2.2 Removing the front cover ..........................177 9.2.3 Removing the outdoor fan ........................... 178 9.2.4 Removing the compressor .......................... 179 9.2.5 Removing the high pressure switch and pressure switch for control ............181 9.2.6 Removing the 4-way valve coil ........................
  • Page 11 10.1.2.4 Abnormal transmission between remote control switch and indoor unit ........222 10.1.2.5 Abnormal operation of the devices ....................223 10.2 Troubleshooting procedure ......................... 234 10.2.1 RAS-3HVRC2 ............................234 10.2.1.1 Alarm codes for the outdoor units ....................234 10.2.1.2 Troubleshooting by alarm code ....................236 10.2.2 RAS-(4-6)H(V)(R/N)(C/P)2E ........................
  • Page 12 11.4 Service and maintenance record using the 7-segment display ............328 11.4.1 Information of Indoor unit ........................... 330 11.4.2 Information of cause code of alarm ......................330 11.4.3 Information of cause code of alarm record ....................330 11.5 Service and maintenance table through the remote control switch ............. 331 11.5.1 RAS-3HVRC2 ............................
  • Page 13 1 General Information G e n e r a l I n f o r m a t i o n Index General information ..........................12 1.1.1 Introduction ..............................12 Applied symbols ............................ 13 Norms and Regulations ......................... 13 Product guide ............................14 1.4.1 ...

  • Page 14: Introduction

    1.1.1 Introduction Hitachi UTOPIA Prime/ UTOPIA IVX Prime series is an outdoor unit series designed with the goal to cover the requirements of the split and multisplit systems, for installations where from one indoor unit (single system) to up to 4 indoor units, are connected to the same UTOPIA outdoor unit (depending on model).

  • Page 15: Applied Symbols

    Tn of CO  equivalent of fluorinated greenhouse gases contained is calculated by indicated GWP * Total Charge (in kg)  indicated in the product label and divided by 1000. Appropriate refrigerant The refrigerant used in each unit is identified on the specification label and manuals of the unit. Hitachi shall not be held  liable for any failure, trouble, malfunction or accident caused by units illegally charged with refrigerants other than the specified one.  Consequences of charging non-specified refrigerant IIt may cause mechanical failure, malfunction and other accidents.

  • Page 16: Product Guide

    1 General Information Product guide 1.4 Product guide 1.4.1 Classification of outdoor unit models Unit type (Outdoor unit): RAS Position-separating hyphen (fixed) Capacity (HP): 3, 4, 5, 6 H = Heat pump V = Single phase unit (1~ 230V 50Hz) - = Three phase unit (3N~ 400V 50Hz) R = R32 refrigerant N = R410A refrigerant C: Simultaneous operation mode P: Individual operation mode 2 = series 2...

  • Page 17: Product Line-Up: Outdoor Units

    1 General Information Product guide 1.4.3 Product line-up: Outdoor units  UTOPIA Prime R410A 1~ 230V 50Hz 3N~ 400V 50Hz 1~ 230V 50Hz 3N~ 400V 50Hz Unit Code Unit Code Unit Code Unit Code Unit Code RAS-3HVRC2 60289185 RAS-4HVRC2E 7E303034 RAS-4HRC2E 7E303134 RAS-4HVNC2E...

  • Page 18: Outdoor Unit Accessory Code List

    60291947 ASG-SP10BTBS (Half) RAS-3HVRC2 60292353 Air inlet of rear side ASG-SP10BES2 RAS-(4-6)H(V)(R/N)(C/P)2E 60291943 ASG-SP10LTBS (Half) RAS-3HVRC2 60292354 Air inlet of left side ASG-SP10LES2 RAS-(4-6)H(V)(R/N)(C/P)2E 60291944 Drain Heater DH-SP63A RAS-3HVRC2 60292335 N O T E Hitachi has a range of accessories and remote control systems that can be used with the UTOPIA Prime and UTOPIA IVX Prime series outdoor units. Please, refer to the Controls Technical Catalogue. SMGB0136 rev.0 - 07/2021...

  • Page 19: Product Line-Up: Indoor Units

    1 General Information Product guide 1.4.5 Product line-up: indoor units N O T E • The indoor unit models and codes are the last updated at time of publication; other previous models and coming developments could be available for combination with the outdoor unit series. • Check the exact classification for each unit (model, type, power and series) in “1.4.1 Classification of outdoor unit models”.  RCI and RCIM indoor units ( R32 / R410A ) RCIM ( R32 / R410A ) 4-way cassette 4-way cassette (compact) Unit Code Unit...
  • Page 20 1 General Information Product guide  RCD and RPC indoor units ( R32 / R410A ) ( R32 / R410A ) 2-way cassette Ceiling type Unit Code Unit Code Unit Code RCD-0.8FSR (*) 60279168 RCD-1.0FSR (*) 60279169 RCD-1.5FSR (*) 60279170 RPC-1.5FSR 60279267 RCD-2.0FSR (*) 60279171 RPC-2.0FSR 60279268...
  • Page 21 1 General Information Product guide  RPI indoor units DUCTED INDOOR UNIT ( R32 / R410A ) RPIL-FSRE RPI-FSRE RPIH-FSRE Unit Code RPIL-0.4FSRE(*1) 7E426048 RPIL-0.6FSRE (*2) 7E426037 RPIL-0.8FSRE 7E426013 RPIL-1.0FSRE 7E426014 RPIL-1.5FSRE 7E426002 RPI-1.5FSRE 7E426015 RPI-2.0FSRE 7E426016 RPI-2.5FSRE 7E426017 RPI-3.0FSRE 7E426018 RPI-4.0FSRE 7E426020 RPIH-4.0FSRE...
  • Page 22 1 General Information Product guide  RPK, RPF and RPFI indoor units ( R32 / R410A ) ( R410A ) RPFI ( R410A ) Wall type Floor type Floor concealed type Unit Code Unit Code Unit Code RPK-0.4FSRM (*1) 60279204 RPK-0.4FSRHM (*1) 60279221 RPK-0.6FSRM (*2) 60279205 RPK-0.6FSRHM (*2) 60279222 RPK-0.8FSRM...

  • Page 23: Product Line-Up: Kpi Energy Recovery Unit

    1 General Information Product guide 1.4.6 Product line-up: KPI energy recovery unit Energy recovery Active (Energy Recovery+ R410A DX section) Unit Code Unit Code KPI-252E4E 70603000 KPI-502E4E 70603001 KPI-502X4E 70603201 KPI-802E4E 70603002 KPI-802X4E 70603202 KPI-1002E4E 70603003 KPI-1002X4E 70603203 KPI-1502E4E 70603004 KPI-2002E4E 70603005 1.4.7 Product line-up: DX-Interface...

  • Page 24: Multi-Kits

    1 General Information Product guide 1.4.9 Multi-Kits Name Description Code Figure E-102SN4 70524201 Branch Pipe E-162SN4 70524202 MH-84AN1 Header Branch 70522009 1.4.10 Individual remote controls Name Description Code Figure PC-ARFP1E Remote control with timer 70510003 PC-ARH1E Simplified remote control 70510004 PC-AWR Wireless remote control 60291969 SMGB0136 rev.0 - 07/2021...

  • Page 25: Receiver Kit For Combination With Wireless Remote Control Switch

    1 General Information Product guide 1.4.11 Receiver kit for combination with wireless remote control switch Receiver kit Compatible wireless remote Indoor unit application Code Figure name control on the panel PC-ALH3  RCI-FSR  PC-AWR 60291767 PC-ALHC1 RCIM-FSRE PC-AWR 70590906 PC-ALHD1  RCD-FSR PC-AWR 60292053 PC-ALHP1...

  • Page 26: Centralised Remote Controls

    1 General Information Product guide 1.4.12 Centralised remote controls Name Description Code Figure PSC-A64GT Touch screen central station 60291730 PSC-A32MN Touch screen central station mini 60291966 PSC-A64S Centralised remote control 60291479 PSC-A16RS Centralised ON/OFF control 60291484 1.4.13 Building air conditioning controls Name Description Code Figure...

  • Page 27: Gateways For Building Management Systems (Bms)

    1 General Information Product guide 1.4.14 Gateways for building management systems (BMS) Name Description Code Figure Integration with installation with intelligent control (Building HC-A16MB Management System) Gateway Interface to MODBUS 7E513210 systems (Max. 16 indoor units). Integration with installation with intelligent control (Building HC-A64MB Management System) Gateway Interface to MODBUS 7E513205 systems (Max. 64 indoor units).

  • Page 28: Control Accessories

    1 General Information Product guide Name Description Code Figure THM-R2AE Remote temperature sensor (THM4) 7E299907 1.4.16 Control accessories Name Description Code Figure Wall mounted support Wall support 2 7E512302 (for both CSNET Manager 2 T10 / T15) Stand mounted support Stand support 7E512301 (for both CSNET Manager 2 T10 / T15)
  • Page 29 2 Optional parts and installation O p t i o n a l p a r t s a n d i n s t a l l a t i o n Index Optional parts and installation for RAS-3HVRC2 .................. 28 2.1.1 ...

  • Page 30: Optional Parts And Installation For Ras-3Hvrc2

    2 Optional parts and installation Optional parts and installation for RAS-3HVRC2 2.1 Optional parts and installation for RAS-3HVRC2  Air flow guide wind guard and snow protection hood Optional parts Model Air flow guide AG-264 Wind guard WSP-264 ASG-SP10FTB (Half) Air outlet  ASG-SP11FTB (Full) Zinc Plate Air inlet of rear side ASG-SP10BTB Air inlet of side face ASG-SP10LTB...

  • Page 31: Wind Guard Wsp-264

    2 Optional parts and installation Optional parts and installation for RAS-3HVRC2 2.1.2 Wind guard WSP-264  Specifications Material Galvanized sheet metal + baked painting Color UTOPIA Beige (Mussel code: 2.5Y8/2) Weight 4.0 kg Unit fixing 4 x [M5 (SUS) x 30] screw Accessories Wind guard 10 x [M5 (SUS) x 12] fixing screw Installation manual “Guard net” “Air flow guide” or “Snow  Installation restriction protection hood” is not available to install  with Wind guard 4-6x10 Long Hole 5 (Both Sides) - M5 Screw (attachement) ...

  • Page 32: Snow Protection Hood

    2 Optional parts and installation Optional parts and installation for RAS-3HVRC2 2.1.3 Snow protection hood 2.1.3.1 Air discharge hood ASG-SP10FTB (Half) (1) ASG-SP10FTBS (Half) (1) Product name ASG-SP11FTB (Full) (2) ASG-SP11FTBS (Full) (2) Stainless Material Bonderized steel sheet  (NSSC 180) Color Gray (1.0Y8.5/0.5) — (1) 1.9 kg Weight (1) 1.9 kg...

  • Page 33: Rear Suction Hood

    2 Optional parts and installation Optional parts and installation for RAS-3HVRC2 2.1.3.2 Rear suction hood Product name ASG-SP10BTB ASG-SP10BTBS Stainless Material Bonderized steel sheet  (NSSC 180) Color Gray (1.0Y8.5/0.5) — Weight 3.9 kg 3.9 kg Assembling Assembly on site Components For rear side air intake x 1 Hood (Upper side x 1 lower side x 1) Fixing screw 4 x [M5x12] Hood fixing screw (SUS) 10 x [M5x12] 12 x [M5x14] Self-screw 2 x (M4x13) Installation restriction...

  • Page 34: Left Suction Hood

    2 Optional parts and installation Optional parts and installation for RAS-3HVRC2 2.1.3.3 Left suction hood Product name ASG-SP10LTB ASG-SP10LTBS Stainless Material Bonderized steel sheet  (NSSC 180) Color Gray (1.0Y8.5/0.5) — Weight 2.5 kg 2.5 kg Assembling Assembly on site Components Hood For left side air intake x 1 Fixing screw 6 [M5x12]  Hood fixing screw (SUS) 6 x [M5x12] 8 x [M5x14] Self-screw 2 (M4x13) Installation restriction Installation with “Guard net” is not available...

  • Page 35: Assembly Of Snow Protection Hood

    2 Optional parts and installation Optional parts and installation for RAS-3HVRC2 2.1.3.4 Assembly of snow protection hood A. Rear side B. Left side C Front side 1 Fixing screw 2 Air inlet hood 3 Wire rope (optional for over turning protection) 4 Air discharge hood 5 Outdoor unit a  > Maximum snowfall height N O T E The holes locations marked with a mark shall be made by using self screw (M4x13) and later shall be used SUS Screw for fixing protec- tion hood.

  • Page 36: Optional Parts And Installation Ras-(4-6)H(V)(R/N)(C/P)2E

    2 Optional parts and installation Optional parts and installation RAS-(4-6)H(V)(R/N)(C/P)2E  2.2 Optional parts and installation RAS-(4-6)H(V)(R/N)(C/P)2E  Air flow guide wind guard and snow protection hood Optional parts Model Air flow guide AG-335A Wind guard WSP-335A ASG-NP335F1 (Half) Air outlet  ASG-SP11FB (Full) Zinc plate Air inlet of rear side ASG-SP10BE Air inlet of side face ASG-SP10LE ASG-NP335FS4 (Half) Air outlet Snow protection  ASG-SP11FBS2 hood Air inlet of rear side...

  • Page 37: Wind Guard Wsp-335A

    2 Optional parts and installation Optional parts and installation RAS-(4-6)H(V)(R/N)(C/P)2E   Service space (In case of upward air discharge) •  In case of right and left sides air discharge enough space for air  Min.200 mm discharge is required. •  The downward air discharge is also available. In such case install  the base under the unit to secure enough space for air discharge. •  In case of serial units installation air discharge should be upward. 2.2.2 Wind guard WSP-335A  Specifications Material Galvanized sheet metal + baked painting Color Gray (1.0Y8.5/0.5) Weight 8 kg 4x 7 Accessories Fixing screw 4 x [M5 (SUS) x 12] Installation manual “Guard net” “Air flow guide” or “Snow protection ...

  • Page 38: Snow Protection Hood

    2 Optional parts and installation Optional parts and installation RAS-(4-6)H(V)(R/N)(C/P)2E  2.2.3 Snow protection hood 2.2.3.1 Air discharge hood ASG-NP335F1 (Half) (1) ASG-NP335FS4 (Half)(1) Product name ASG-SP11FB (Full) (2) ASG-SP11FBS2 (Full) (2) Stainless Material Bonderized steel sheet  (NSSC 180) Color Gray (1.0Y8.5/0.5) — (1)  3 kg (1)  3 kg Weight (2)  8 kg (2)  8 kg Assembling Assembly on site Components Hood...

  • Page 39: Rear Suction Hood

    2 Optional parts and installation Optional parts and installation RAS-(4-6)H(V)(R/N)(C/P)2E  2.2.3.2 Rear suction hood Product name ASG-SP10BE ASG-SP10BES2 Stainless Material Bonderized steel sheet  (NSSC 180) Color Gray (1.0Y8.5/0.5) — Weight 11 kg 11 kg Assembling Assembly on site Components For rear side air intake x 1 Hood (Upper side x 1 lower side x 1) Fixing screw 9 x [M5x12] Hood fixing screw (SUS) 14 x [M5x12] 16 x [M5x14] Self-screw Installation restriction Installation with “Guard net” is not available Safety wire rope ASG-SW20A (for overturning prevention (optional parts)) (763) 2 x I8 Nº...

  • Page 40: Left Suction Hood

    2 Optional parts and installation Optional parts and installation RAS-(4-6)H(V)(R/N)(C/P)2E  2.2.3.3 Left suction hood Product name ASG-SP10LE ASG-SP10LES2 Stainless Material Bonderized steel sheet  (NSSC 180) Color Gray (1.0Y8.5/0.5) — Weight 6.5 kg 6.5 kg Assembling Assembly on site Components Hood For left side air intake x 1 Fixing screw 10 x [M5x12] Hood fixing screw (SUS) 12 x [M5x12] 14 x [M5x14] Self-screw Installation manual Installation restriction Installation with “Guard net” is not available Safety wire rope ASG-SW20A (for overturning prevention (optional parts)) (300) Enlarged view of A ...

  • Page 41: Assembly Of Snow Protection Hood

    2 Optional parts and installation Optional parts and installation RAS-(4-6)H(V)(R/N)(C/P)2E  2.2.3.4 Assembly of snow protection hood A. Rear side B. Left side C Front side 1 Fixing screw 2 Rear suction hood 3 Wire rope (optional for over turning protection) 4 Air discharge grille 5 Left suction hood 6 Air discharge hood 7 Outdoor unit a  > Maximum snowfall height (370) (950) N O T E The holes locations marked with a mark shall be made by using self screw (M4X13) and later shall be used SUS Screw for fixing protec- tion hood.

  • Page 43: Piping Work And Refrigerant Charge

    3 Piping work and refrigerant charge P i p i n g w o r k a n d r e f r i g e r a n t c h a r g e Index General notes before performing pipe work ..................42 3.1.1 Piping Materials .............................

  • Page 44: General Notes Before Performing Pipe Work

    3 Piping work and refrigerant charge General notes before performing pipe work 3.1 General notes before performing pipe work 3.1.1 Piping Materials 1 In order to avoid supply problems in terms of local regulations and quality, prepare locally-supplied copper pipes. N O T E In case of using copper pipes for piping sections bigger than Ø19.05 mm (3/4 inches), flaring work cannot be performed.
  • Page 45 3 Piping work and refrigerant charge General notes before performing pipe work C A U T I O N • Cap the end of the pipe when pipe is to be inserted through a wall hole. • Do not put pipes on the ground directly without a cap or vinyl tape at the end of the pipe. •...

  • Page 46: Three Principles On Refrigerant Piping Work

    3 Piping work and refrigerant charge General notes before performing pipe work 3.1.2 Three principles on refrigerant piping work In order to avoid oxidation, pay much careful attention to basic piping work control to avoid infiltration of moisture or dust  during the refrigerant piping work. Three principles Cause of failure Presumable failure Preventive action •  Water infiltration due to  Icing inside tube at expansion Pipe protection valve 1 Pinching...

  • Page 47: Brazing Work

    3 Piping work and refrigerant charge General notes before performing pipe work 3.1.4 Brazing work The most important work in the refrigerant piping installation work is the brazing of the pipes. If it accidentally occurs a leakage due to a careless brazing process, it will cause clogged capillary pipes or serious compressor failure. In order to guarantee a proper brazing neck between different pipes surfaces, accurate pipe dimensions after the expansion process (see the table below): It is important to control the clearance of the pipe fitting portion as shown below. In the case that a cooper tube expansion ...

  • Page 48: Piping Connection For Outdoor Unit

    3 Piping work and refrigerant charge Piping connection for outdoor unit 3.2 Piping connection for outdoor unit 3.2.1 RAS-3HVRC2 1 Take the piping cover away from the unit. Then fetch the pipes through the rear side and route piping according to the installation place as shown in the figure. Make holes by cutting along the guideline at the rear of the cover or ...

  • Page 49: Ras-(4-6)H(V)(R/N)(C/P)2E

    3 Piping work and refrigerant charge Piping connection for outdoor unit 3.2.2 RAS-(4-6)H(V)(R/N)(C/P)2E 1 The pipes can be connected from 4 directions. Make holes in the piping cover or cabinet for taking out pipes. Nº Description  Rear side piping work ...
  • Page 50 3 Piping work and refrigerant charge Piping connection for outdoor unit  For the front and side piping Select the correct knock-out size depending on whether it is for power wiring or transition wiring Front piping hole Rigth side piping hole To use racking or conduit tubes, check the size and remove part following the slit.
  • Page 51 3 Piping work and refrigerant charge Piping connection for outdoor unit 6 Check to ensure that the stop valves are completely closed before connecting pipes. 7 Connect the field supplied refrigerant pipes to the indoor unit and outdoor unit. Apply the oil thinly at the seat flare nut  and pipe before tightening. The required tightening torque is as follows: Pipe Size Tightening Torque (Nm) Ø...

  • Page 52: Outdoor Unit Stop Valve

    3 Piping work and refrigerant charge Piping connection for outdoor unit 3.2.3 Outdoor unit stop valve 1 Remove the stop valve cap before performing the air tight test after connecting the flare nut. Tighten the spindle valve  in clockwise according to the following table “Tightening Torque of Stop Valves.” 2 Tighten the flare nut according the specified torque. If the tightening torque is excessive, it may cause refrigerant  leakage from the spindle part. 3 Perform the air tight test after the tightening work. It is more effective to perform this work after fix the flare nuts for  the piping connection to the stop valves. 4 Use the charging hose for the check joint connection. When removing the charging hose from the check joint, a ...
  • Page 53 3 Piping work and refrigerant charge Piping connection for outdoor unit Do not apply two spanners at Use two spanners  this position. If applied, here for pipe leakage will occur. Stop valve connection (Spindle type) Do not work with two spanners Flare nut here.

  • Page 54: Refrigerant Piping Range

    3 Piping work and refrigerant charge Refrigerant piping range 3.3 Refrigerant piping range 3.3.1 Refrigerant piping length The refrigerant piping between the indoor unit and the outdoor unit should be designed using the following chart. Keep the design point within the area of the chart, which is showing the applicable height difference according to piping length.

  • Page 55: Maximum Lenght Of Refrigerant Piping

    3 Piping work and refrigerant charge Refrigerant piping range 3.3.3 Maximum lenght of refrigerant piping Outdoor Unit 3 HP 4 HP 5 HP 6 HP Maximum piping length between Actual length (L) the outdoor unit and the farthest Equivalent length (EL) indoor unit 2 units (A+B+C) 3 units (A+B+C+D)

  • Page 56: Combinations Of Piping Size And Piping Length

    3 Piping work and refrigerant charge Refrigerant piping range 3.3.4 Combinations of piping size and piping length Liquid Ø6.35 Ø9.52 Ø12.70 Ø15.88 Ø9.52 Ø12.70 Ø15.88 Ø19.05 Ø12.70 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø15.88 Ø19.05 Ø22.20 Ø25.40 Ø28.58 Ø22.20 Ø25.40 Ø28.58 3 HP (1) (2) 4 - 5 - 6 HP (3) (4)
  • Page 57 If the capacity ratio of branch of indoor units 1 and 2 is bigger than 60% of total capacity of the system or capacity ratio of branch of indoor units 3 and 4 is bigger than 60 % of total capacity of the system, please contact with your Hitachi Dealer or Hitachi Customer Service Department.

  • Page 58: System Installation

    3 Piping work and refrigerant charge Refrigerant piping range 3.3.6 System installation N O T E • Pipe connection size on outdoor units, indoor units and the multikit or distributor vary according to the system. • The sizes of the indoor and outdoor units could be different. Adjust the flare adapter (accessory) to the indoor pipe connection in these cases.
  • Page 59 All pictures are as example. Branch and headers are not showed as real sizes or real picture, for the installation of this components fol- low the technical documentation.  Installing Distributor 1 Install the distributor supplied by Hitachi on request. A tee can not be installed instead of a branch pipe. 2 Installing the distributor Fix the branch pipe horizontally to the pillar, wall or ceiling. Piping must not be fixed rigidly to the wall as thermal ...
  • Page 60 3 Piping work and refrigerant charge Refrigerant piping range Horizontal Horizontal To Indoor unit To indoor Vertical unit Horizontal Fixing the branch pipe to  To outdoor unit Fixing the branch pipe to the  ceiling or beam surface of pillar or wall N O T E Fix the piping from outside of insulation or inserting absorber between the pipe and a fixing metal. 3 Correct position of distributor (available also for quad installation) This is the correct position This is wrong position...

  • Page 61: Refrigerant Charge

    3 Piping work and refrigerant charge Refrigerant charge 3.4 Refrigerant charge C A U T I O N • Do not charge OXYGEN, ACETYLENE, or other flammable and poisonous gases into the refrigerant, as an explosion could occur. It is recommended that oxygen free nitrogen be charged for these types of test cycles when performing a leakage test or an airtight test. These types of gases are extremely dangerous.

  • Page 62: Caution Of The Pressure By Check Joint

    • The refrigerant used in each unit is identified on the specification label and manuals of the unit. Hitachi shall not be held liable for any failure, trouble, malfunction or accident caused by units illegally charged with refrigerants other than the specified one.

  • Page 63: Refrigerant Charge Before Shipment (W (Kg))

    3 Piping work and refrigerant charge Refrigerant charge 3.4.3 Refrigerant charge before shipment (W (kg)) is the outdoor unit refrigerant charge before shipment explained before, and it’s shown in the following table: UTOPIA series 2 Refrigerant charge before Additional refrigerant charge Maximum additional charge Model shipment (W...
  • Page 64 3 Piping work and refrigerant charge Refrigerant charge  Step 4: Record the refrigerant charge Fill the “F-Gas Label” with the refrigerant charge quantity in order to facilitate maintenance and servicing activities:  Factory Charge  Additional Charge  Total Charge  t CO SMGB0136 rev.0 - 07/2021...

  • Page 65: Caution In Case Of Refrigerant Leakage

    3 Piping work and refrigerant charge Caution in case of refrigerant leakage 3.5 Caution in case of refrigerant leakage D A N G E R • Fitters and the designers of the installations must strictly observe local and national legislation, and local codes regarding safety requirements in the event of refrigerant leaks.

  • Page 66: Countermeasure For R410A Refrigerant Leakage

    3 Piping work and refrigerant charge Caution in case of refrigerant leakage = (m */(2.5*LFL^ (5/4) Installation restrictions for indoor units using R32 refrigerant • A : Minimum installation area of an Indoor unit for a given refrigerant charge m (kg) and considering the installation height h • h : Installation height of the bottom side of the indoor...

  • Page 67: Drain Piping

    3 Piping work and refrigerant charge Drain piping 3.6 Drain piping 3.6.1 Drain discharging boss When the base of the outdoor unit is temporarily utilized as a drain receiver and the drain water in it is discharged, this drain boss is utilized to connect the drain piping. Model Applicable Model DBS-12L...

  • Page 69: Electrical And Control Settings

    4 Electrical and control settings E l e c t r i c a l a n d c o n t r o l s e t t i n g s Index General notes ............................68 4.1.1 General check ............................... 68 4.1.2 LED’s indication .............................

  • Page 70: General Notes

    4 Electrical and control settings General notes 4.1 General notes D A N G E R • Do not connect of adjust any wiring or connections unless the main power switch is OFF. • Use an earth leakage breaker with medium sensitivity, and an activation speed of 0.1 sec or less. If this is not fitted, there is a risk of electric shock and/or fire. • Install an earth leakage breaker, fuse and circuit breaker for each outdoor unit power line. Not fitting it may cause an electric shock or fire. • Never connect the earth cable to the refrigerant pipes. Fire can may occur. • Do not connect the earth cable to the lighting arrest system. The electrical potential of earth would increase abnormally. C A U T I O N • Before any electrical wiring work or regular inspections, switch off the main power supply switches of the indoor and outdoor units. Wait three minutes before starting installation or maintenance work. • Make sure that the indoor and outdoor are completely stopped before starting work on the electrical wiring or regular inspections. •...

  • Page 71: Electrical Wiring Connection For The Outdoor Unit

    4 Electrical and control settings Electrical wiring connection for the outdoor unit 4.2 Electrical wiring connection for the outdoor unit The correct electrical wiring connection for the outdoor unit is shown below. 1 Ensure the connection of the three-phase power supply source wires L1, L2, L3 and N (for 400V/50Hz) or L1 and N (for 230V/50Hz ) to the terminal board.

  • Page 72: Electrical Settings

    4 Electrical and control settings Electrical settings 4 When routing out cable, make sure that it does not obstruct mounting of the outdoor service cover. Rear cover Earth screw Wiring Method Wiring method with clamp Keep a distance between each wiring Insert the wires into the cord clamp and terminal and attach insulation tape or clamp them as shown in the figure.

  • Page 73: Wire Size

    4 Electrical and control settings Electrical settings Power source from the outdoor unit to the indoor unit Independent power source of outdoor unit and indoor unit Number 0 System Number 0 System L1 L2 L3 L1 L2 L3 Outdoor unit Outdoor unit L1 L2 L3 Operating line...
  • Page 74 4 Electrical and control settings Electrical settings  Main switch protection Select the main switches in according to the next table: Model Power supply Max. current (A) CB (A) ELB (no.poles/A/mA) 1~ 230V 50Hz All Indoor Units (except 8, 10, 16 and 2/40/30 1~220-240V 50Hz (depending on 20HP)

  • Page 75: Electrical Wiring Diagrams

    4 Electrical and control settings Electrical wiring diagrams 4.4 Electrical wiring diagrams 4.4.1 RAS-3HVRC2 A10596430A SMGB0136 rev.0 - 07/2021...
  • Page 76 4 Electrical and control settings Electrical wiring diagrams Mark Name Motor for Compressor Motor for Outdoor Fan Reversing Valve Relay EFR1, Fuse on PCB PF1,3 Micro-Computer Control Expansion Valve Terminal Board PCB1,2 Printed Circuit Board THM7~10 Thermistor High Pressure Switch for Protection Pressure Switch for Control Oil heater Reactor...

  • Page 77: Ras-(4-6)Hv(R/N)(C/P)2E (1~ 230V 50Hz)

    4 Electrical and control settings Electrical wiring diagrams 4.4.2 RAS-(4-6)HV(R/N)(C/P)2E (1~ 230V 50Hz) XEKS2001 SMGB0136 rev.0 - 07/2021...
  • Page 78 4 Electrical and control settings Electrical wiring diagrams MARK NAME Crank-case Heater Aerial Connectors 16-17 Reactor Electric Motor (for the compressor) Electric Motor (for the outdoor fan) Electronic expansion valve Noise Filter (Ring core) 1~2,4~8 PCB for control PCB for Dip Switch PCB for Fan Pressure sensor (discharge side) High pressure breaker Device...

  • Page 79: Ras-(4-6)Hv(R/N)(C/P)2E (3N~ 400V 50Hz)

    4 Electrical and control settings Electrical wiring diagrams 4.4.3 RAS-(4-6)HV(R/N)(C/P)2E (3N~ 400V 50Hz) XEKS2002 SMGB0136 rev.0 - 07/2021...
  • Page 80 4 Electrical and control settings Electrical wiring diagrams MARK NAME Terminating connector 1,2,3 Crank-case Heater Aerial Connectors 16-17 Reactor Electric Motor (for the compressor) Electric Motor (for the outdoor fan) Electronic expansion valve Noise Filter (Printed board) Noise Filter (Ring core) PCB for control PCB for Inverter PCB for Fan...

  • Page 81: Control System

    5 Control System C o n t r o l S y s t e m Index Device control system ........................... 80 5.1.1 RAS-3HVRC2 ..............................80 5.1.2 RAS-(4-6)H(V)(R/N)(C/P)2E ......................... 81 5.1.3 Outline of the control system ......................... 82 Outdoor units Printed circuit board (PCB) ..................... 84 5.2.1 RAS-3HVRC2 ..............................

  • Page 82: Device Control System

    5 Control System Device control system 5.1 Device control system The figure below shows the outline of the control system. 5.1.1 RAS-3HVRC2 Multiple signals Single signals Operation signals Wireless remote control switch Thermistor for inlet air Thermistor of discharge air Thermistor for gas pipe Thermistor for outdoor temperature Thermistor for liquid pipe...

  • Page 83: Ras-(4-6)H(V)(R/N)(C/P)2E

    5 Control System Device control system 5.1.2 RAS-(4-6)H(V)(R/N)(C/P)2E Cooling operation Control device Control Category Purpose of Control To determine the compressor frequency depending on: - Difference between Indoor Inlet Air Temperature and Setting Compressor inverter Total indoor units Operating Temperature frequency Capacity - Amount of Temperature Difference Change...

  • Page 84: Outline Of The Control System

    5 Control System Device control system Defrosting (Dry operation is included in the cooling operation) Control device Condition Compressor inverter SVA: ON (during operation stop) frequency Electronic Expansion To determine the IU electronic expansion valve opening depending on the temperature at the top of the Valve for indoor unit Heat compressor (Td).
  • Page 85 5 Control System Device control system The figure below shows the outline of the control system for RAS-(4-6)H(R/N)(C/P)2E Multiple signals Suction gas pressure sensor Single signals Wireless remote control switch Thermistor for inlet air Discharge gas pressure sensor Thermistor of discharge air Thermistor for outdoor temperature Operation signals Discharge gas thermistor...

  • Page 86: Outdoor Units Printed Circuit Board (Pcb)

    5 Control System Outdoor units Printed circuit board (PCB) 5.2 Outdoor units Printed circuit board (PCB) 5.2.1 RAS-3HVRC2 Switch indication PCB1 LED indication DSW1 No setting required LED1 Power source for the PCB DSW2 Function selection This LED indicates the inverter LED2 Green transmission status...

  • Page 87: Ras-(4-6)H(V)(R/N)(P/C)2E

    5 Control System Outdoor units Printed circuit board (PCB) 5.2.2 RAS-(4-6)H(V)(R/N)(P/C)2E RAS-(4-6)HV(R/N)(C/P)2E (PCB2) RAS-(4-6)H(R/N)(C/P)2E (PCB) Display Display (7SEG) (7SEG) DSW3 DSW1 DSW2 DSW6 SEG1 DSW2 DSW4 DSW1 PSW1 PSW2 PSW3 SEG1 DSW3 PSW1 PSW2 PSW3 DSW4 RSW1 DSW7 DSW6 DSW5 RSW1 DSW7 DSW1 and PSW can be operated while power source is ON.

  • Page 88: Ras-(4-6)H(R/N)(C/P)2E (Pcb)

    5 Control System Outdoor units Printed circuit board (PCB) 5.2.2.2 RAS-(4-6)H(R/N)(C/P)2E (PCB) Item Part Name LED1, LED2, LED3, LED4, LED6 Connector PCN***, CN*** Fuse EFR1, EFS1 Check Point P1, GND, VCC05, VCC13, VDC-1 VDC1 LED6 VCC13 LED2 EFR1 LED3 LED1 VCC05 LED4 EFS1...

  • Page 89: Protection Control

    5 Control System Protection control 5.3 Protection control 5.3.1 Protection control code on 7-segment display 1 Protection control code is displayed on 7-segment when a protection control is activated. 2 Protection control code is displayed while function is working, and goes out when released. 3 When several protection control are activated, code number with higher priority will be indicated (see below for the priority order).

  • Page 90: Activating Condition Of Protection Control Code

    5 Control System Protection control 5.3.2 Activating condition of protection control code To monitor the conditions such as the temperature change and others, the control of the frequency and other controls are performed by the protection control in order to prevent the abnormal operations. The activating conditions of protection control are shown in the table below: Code Protection Control...
  • Page 91 5 Control System Protection control  P02: High pressure protection control The high pressure protection control is carried out to prevent the protection device from being activated due to an increase in high pressure during an anomaly and protect the compressor from excessive high pressure increases. Normal operation Not allowing frequency increases (only frequency decreases Pd ≤...
  • Page 92 5 Control System Protection control  P04: Inverter fin temperature increase protection control The inverter fin temperature increase protection control is carried out to prevent the damage of the inverter caused by the increase in inverter fin temperature. Normal operation Not allowing frequency increases (only frequency decreases are allowed) Forced decrease in frequency (0.125 Hz/s)
  • Page 93 5 Control System Protection control  P0A: Demand current control The compressor operation frequency is controlled to set at the setting value of the outdoor unit inverter primary current (40% to 100% of rated current of cooling operation). This function is detailed in the “External Input and Output Setting”. Refer to the Service Manual for details.
  • Page 94 5 Control System Protection control Related protection control a. Pressure ratio decrease protection control (P1). b. Discharge pressure increase protection control (P2). c. Inverter overcurrent protection control (P3). d. Inverter fin temperature increase protection control (P4). e. Discharge temperature increase protection control (P5). Example of discharge temperature increase protection control for RAS-(4-6)H(V)(R/N)(C/P)2E: Normal operation...

  • Page 95: Control And Safety Devices

    5 Control System Control and safety devices 5.4 Control and safety devices 1 Compressor protection: the compressor is protected by High Pressure switch, this switch stops the compressor when the discharge pressure exceeds the set value. 2 Oil heater: this band-type heater protects against the formation of foam on the oil during cold starts and remains enabled when the compressor is at a standstill.

  • Page 96: Standard Operation Sequence Ras-3Hvrc2 And Ras-(4-6)H(V)(R/N)(C/P)2E

    5 Control System Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E 5.5 Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E 5.5.1 Cooling operation Indoor Unit I.U. : Outdoor Unit O.U. : : Actuator ≥ 86°F (30°C) or ≥ Outdoor Temp. 77°F (25°C) Temperature at Power to Power to Power to...
  • Page 97 5 Control System Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E Cooling operation (continued) I.U. : Indoor Unit O.U. : Outdoor Unit : Actuator Inverter: OFF MC Operation: OFF < 77°F (25°C) Temp. at Top < Outdoor Temp. +68°F (+20°C) Power to CH : ON of Compressor >...

  • Page 98: Dry Operation

    5 Control System Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E 5.5.2 Dry operation I.U. : Indoor Unit Outdoor Unit O.U. : Actuator ≥ 86°F (30°C) or ≥ Outdoor Temp. 77°F (25°C) Power to OU PCB: Temp. at Top of Power to OU: ON Power to CH : ON Compressor <...
  • Page 99 5 Control System Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E Dry operation (continued) I.U. : Indoor Unit O.U. : Outdoor Unit Actuator Inverter: OFF MC Operation: OFF < 77°F (25°C) < Outdoor Temp. +68°F (+20°C) Temp. at Top of Power to CH : ON Compressor >...

  • Page 100: Heating Operation

    5 Control System Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E 5.5.3 Heating operation I.U. : Indoor Unit O.U. : Outdoor Unit Actuator ≥ 86°F (30°C) or ≥ Outdoor Temp. 77°F (25°C) Power to OU PCB: Temp. at Top of Power to OU: ON Power to CH : ON Compressor <...
  • Page 101 5 Control System Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E Heating operation (continued) I.U. : Indoor Unit O.U. : Outdoor Unit Actuator Inverter: OFF MC Operation: OFF < 77°F (25°C) < Outdoor Temp. +68°F (+20°C) Temp. at Top of Power to CH : ON Compressor >...

  • Page 102: Defrost Operation Ras-3Hvrc2

    5 Control System Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E 5.5.4 Defrost operation RAS-3HVRC2 I.U: Indoor Unit : Actuator Four-way valve (21) Energization OFF Heating Operation Display during defrosting Auxiliary Electric heater (H) (Y52H) Energize (52H) Energize Defrosting operation Start Condition is approved Indoor fan (MFE) Stop Outdoor fan (MFC) Stop...

  • Page 103: Defrost Operation Ras-(4-6)H(V)(R/N)(C/P)2E

    5 Control System Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E 5.5.5 Defrost operation RAS-(4-6)H(V)(R/N)(C/P)2E I.U. : Heating Indoor Unit Operation Actuator Defrosting Start Condition is approved Power to RVR : OFF "DEFROST" Indication MIF Operation: OFF MOF Operation: OFF Defrost Operation Defrosting Stop Condition is approved...
  • Page 104 5 Control System Standard operation sequence RAS-3HVRC2 and RAS-(4-6)H(V)(R/N)(C/P)2E  Standard Defrost 1 Temperature Condition Defrost Operation Stop Area (15) Temperature Conditions under Defrost Operation (-2) Defrost (-10) Operation Start Area (-21) (-15) (-5) (10) Outdoor Temperature [°F (°C)] 2 Conditioning of Operating Time for Defrost Operation Start The defrost operation starts when the temperature condition shown in “(a) Temperature Condition”...

  • Page 105: Standard Control Functions

    5 Control System Standard control functions 5.6 Standard control functions 5.6.1 Freezing protection during cooling process or dry operation Power supply Cooling or dry operation compressor operated for more than 30min. : The check interval differs depending on the conditions Cooling or dry operation or liquid...

  • Page 106: Prevention Control For Excessively High Discharge Gas Temperature

    5 Control System Standard control functions 5.6.2 Prevention control for excessively high discharge gas temperature Heating operation < 65ºC air outlet temperature ≥ 65ºC CMC: OFF Compressor: progress ≥ 65ºC outlet temperature < 65ºC temp is lower than air intake temp CMC: ON Compressor:...

  • Page 107: Optional Functions

    6 Optional functions O p t i o n a l f u n c t i o n s Index RAS-3HVRC2............................106 6.1.1 Menu mode accessing (by 7-segment display) ................... 106 6.1.2 External input and output setting (by 7-segment display) ................107 6.1.3 Function setting (by 7–segment display) ......................110 RAS-(4-6)H(V)(R/N)(C/P)2E .......................

  • Page 108: Ras-3Hvrc2

    6 Optional functions RAS-3HVRC2 6.1 RAS-3HVRC2 6.1.1 Menu mode accessing (by 7-segment display) Make sure to perform external input/output and setting while the outdoor unit is stopped. It cannot be set while the outdoor is operating or check mode. PCB1 PCB2 7-segment display, DSWs and PSWs location.

  • Page 109: External Input And Output Setting (By 7-Segment Display)

    6 Optional functions RAS-3HVRC2 6.1.2 External input and output setting (by 7-segment display) 6.1.2.1 Available control functions The outdoor unit PCB1 has three input terminals (CN1, CN2) that receive external signals and two output terminals (CN7) that send signals to the exterior. The control functions are available by setting input and output terminals as shown below: Control function number Setting of input functions Configuration of output functions...

  • Page 110: Setting Of External Input And Output

    6 Optional functions RAS-3HVRC2 6.1.2.2 Setting of external input and output If the initial setting has to be modified, the following instructions must be followed: 1 DSW301 PIN4 of the outdoor unit PCB must be set to “ON” before the modification in order to prevent activation of the compressor.

  • Page 111: Available Ports

    6 Optional functions RAS-3HVRC2 N O T E • Do not set same function to multiple output ports. If set, the setting of the higher output number is cleared to 6.1.2.4 Available ports The system has the following output ports. Content Setting of the port in the PCB of the indoor unit Remarks Outlet 1-2 of CN7 DC 12V 1 Outputs 1-3 of CN7 DC 12V...

  • Page 112: Available Output Signals

    6 Optional functions RAS-3HVRC2 6.1.2.5 Available output signals Ind. Output signal Application Port Nº setting application Nº setting Operation signal This signal allows to pick up the machine’s operation signal. Alarm signal This signal picks up the machine’s alarm. Compressor ON signal This single allows to pick up the compressor’s operation signal.
  • Page 113 6 Optional functions RAS-3HVRC2 DSW301 PIN4 ON DSW2 PIN5 ON Outdoor expansion valve Circulator function at heating Effectivity of initial opening for heating Thermo-OFF Alternation Defrost Mode Low Noise Setting Night-Shift No Function Demand function setting Cancellation of outdoor ambient No Function temperature limit Wave function setting...

  • Page 114: Function Setting

    6 Optional functions RAS-3HVRC2 6.1.3.2 Function setting 7-Segment Setting Item Contents Display Not available (default setting) Circulator function at heating Thermo- Heating Thermo-OFF fan intermittent operation Not available (default setting) Night-shift (low noise) Night-shift Not available (default setting) For heating Cancellation of outdoor ambient temperature limit For cooling...
  • Page 115 6 Optional functions RAS-3HVRC2 7-Segment Setting Item Contents Display Not available (default setting) No Function No setting No setting Not available (default setting) No Function No setting Not available (default setting) Thermo-OFF Setting for Outdoor Unit after Defrosting Operation Forced stop upon return from defrosting Not available (default setting) Outdoor Fan Star/Stop Operation 1 Intermitent operation of outdoor fan...
  • Page 116 6 Optional functions RAS-3HVRC2  Record settings Fill out the selected function setting number in the space of the table as shown (SET). Item SEG2 SEG1 Circulator function at heating Thermo-OFF Night-shift (low noise) Cancellation of outdoor ambient temperature limit Defrost J...

  • Page 117: Circulator Function At Heating Thermo-Off (Fa)

    6 Optional functions RAS-3HVRC2 6.1.3.3 Circulator function at heating Thermo-OFF (FA) Press PSW1 and select the setting of the condition “0” to “1” of the indoor unit fan control during the Thermo-OFF in heating mode “FA”. Normally, the fan speed is changed to “LOW” at heating Thermo-OFF. (There is a case that the room temperature is too high at the heating Thermo-OFF.) However, the indoor fan motor is operated at “LOW”...

  • Page 118: Cancellation Of The Outdoor Ambient Temperature Limit (Gs)

    6 Optional functions RAS-3HVRC2 6.1.3.5 Cancellation of the outdoor ambient temperature limit (GS) Press PSW1 and select the setting condition “0” to “3” at the cancellation of outdoor ambient temperature limit of G5. Then this function can be set. The heating operation is continued under a high outdoor temperature or the cooling operation is continued under a low temperature.

  • Page 119: Change Of Defrost Condition (Jo)

    6 Optional functions RAS-3HVRC2 6.1.3.6 Change of defrost condition (J) These optional function is available for being selected using the PSW switches and 7-segment on the PCB: This function allows to shift the temperature conditions in order to cause an earlier defrosting. It is useful in installations placed in very cold regions, where frost generates continuously;...

  • Page 120: Slo Defrost Setting (Bj)

    6 Optional functions RAS-3HVRC2 6.1.3.7 SLo defrost setting (bJ) Press PSW1 and select the settings condition “0” to “1” at the SLo defrost setting “bJ”. The indoor fan stops during the defrost operation and starting of heating operation. However, the indoor fan can operate at low speed during the defrosting operation and starting of heating operation.

  • Page 121: Change Of Heating Thermo-Off Opening Degree Of The Expansion Valve (So)

    6 Optional functions RAS-3HVRC2 6.1.3.12 Change of heating Thermo-OFF opening degree of the Expansion Valve (S) The opening degree of the expansion valve of the heating Thermo-OFF unit can be changed by setting the heating Thermo-OFF opening degree “S” to “1” or “2” in the function selection. Setting condition Operation mode Not available (default setting)

  • Page 122: Demand Function Setting (De)

    6 Optional functions RAS-3HVRC2 6.1.3.15 Demand function setting (dE) Demand current control is enabled even when no signal is input to the external input terminal of the outdoor PCB by setting “dE” to “1” for the demand function always enabled in the function selection setting. Press PSW1 and select the settings for conditions “0”...

  • Page 123: Wave Function Setting (Ue)

    6 Optional functions RAS-3HVRC2 6.1.3.16 Wave function setting (UE) Press PSW3 and select the settings condition “0” to “1” to set wave function setting “UE”. The maximum running current limit changes from 40% to 80%, as shown in the attached figure. N O T E In the case that the demand current control by external input is set and the external input signal is available,this function is not available even when the demand current control by external input signal is performed.

  • Page 124: Intermittent Operation Of Outdoor Fan (F1)

    6 Optional functions RAS-3HVRC2 6.1.3.19 Intermittent operation of outdoor fan (F1) It can be used as a simple snow prevention measure (auxiliary function) for outdoor fans. Intermittent operation of outdoor fan is enabled when external input function number “4” is set or when function selection setting “F1”...

  • Page 125: Cancellation Of Defrost At Absence Judgement (F9)

    6 Optional functions RAS-3HVRC2 N O T E This mode performs defrosting alternately for each combination of outdoor unit A (refrigerant system is even) and outdoor unit B (refriger- ant system is the refrigerant system of outdoor unit A + 1) connected by H-LINK II. 6.1.3.21 Cancellation of Defrost at Absence Judgement (F9) When “F9” is set to “1” in the function selection, this function allows the unit to continue defrosting or heating operation without defrosting even if the motion sensor determines that no one is present in the area during defrosting preparation. Setting condition Operation mode Not available (default setting)

  • Page 126: Ras-(4-6)H(V)(R/N)(C/P)2E

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2 RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.1 Menu mode accessing (by 7-segment display) Make sure to perform external input/output and setting while the outdoor unit is stopped. It cannot be set while the outdoor is operating or check mode. RAS-(4-6)HV(R/N)(C/P)2E (PCB2) RAS-(4-6)H(R/N)(C/P)2E (PCB1) 7-segment 7-segment...

  • Page 127: External Input And Output Setting (By 7-Segment Display)

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.2 External input and output setting (by 7-segment display) 6.2.2.1 Available control functions The outdoor unit PCB1 has three input terminals (CN1, CN2) that receive external signals and two output terminals (CN7) that send signals to the exterior. The control functions are available by setting input and output terminals as shown below: Control function number Setting of input functions Configuration of output functions...

  • Page 128: Setting Of External Input And Output

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.2.2 Setting of external input and output If the initial setting has to be modified, the following instructions must be followed: 1 DSW1 PIN4 of the outdoor unit PCB must be set to “ON” before the modification in order to prevent activation of the compressor.

  • Page 129: External Input Function Setting

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.2.3 External input function setting The following signals can be received by the outdoor unit PCB1.  Fixing heating operation mode (Control function nº 1) / Fixing cooling operation mode (Control function nº 2) When the input terminals for setting the operation mode of the outdoor unit PCB1 are short-circuited, the operation mode can be fixed for cooling or heating mode.
  • Page 130 6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E  Outdoor unit fan motor start/stop (Control function nº 4) This is an auxiliary function to protect the outdoor unit from snow. When the input terminals for Outdoor Fan Motor Start/ Stop on the outdoor unit PCB1 are short-circuited during the compressor stoppage, all the outdoor fan motors start operating.

  • Page 131: External Output Function Setting

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.2.4 External output function setting The following signals can be received by the outdoor unit PCB. Specification for the main component requirements: Components Specifications Auxiliary relay (*) High power relay, LY2F DC12V N O T E (*) Do not use the relays made with diodes.

  • Page 132: Function Setting (By 7-Segment Display)

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E  Defrosting signal (Control function nº4) This function is used to receive the defrosting signal. The auxiliary contact relay (RYa) is closed during defrosting. Setting example: Defrosting Stoppage at Output 2 (between 1 and 3 pins of CN7). Auxiliary relay 3-pin connector Connector CN7...

  • Page 133: Slo (Fan Speed)Defrost Setting

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E DSW1 PIN4 ON DSW2 PIN5 ON Indoor expansion valve Circulator function at heating initial opening during heating Not prepared Thermo-OFF Thermo-OFF Low Noise Setting Night-Shift Not prepared Demand function setting Cancellation of outdoor ambient High static pressure temperature limit mode setting Defrost for cold area (Change of...

  • Page 134: Function Setting

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.3.2 Function setting 7-Segment Setting Item Contents Display Initial setting Circulator function at heating Thermo- Heating Thermo-OFF fan intermittent operation Initial setting Night-shift (low noise) Night-shift Initial setting For heating Cancellation of outdoor ambient temperature limit For cooling For cooling/heating Initial setting...
  • Page 135 6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 7-Segment Setting Item Contents Display Initial setting Hot gas bypass control disabled Hot gas bypass control disabled Initial setting Thermo-OFF setting for outdoor unit after defrosting operation Forced stop upon return from defrosting Initial setting Intermittent fan operation (30[s] run / 570[s] stop) Intermitent operation of outdoor fan Intermittent fan operation (60[s] run / 540[s] stop) motor...
  • Page 136 6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E  Record settings Fill out the selected function setting number in the space of the table as shown (SET). Item SEG2 SEG1 Circulator function at heating Thermo-OFF Night-shift (low noise) Cancellation of outdoor ambient temperature limit Defrost for cold area (Change of defrost condition) J...

  • Page 137: Circulator Function At Heating Thermo-Off (Fa)

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.3.3 Circulator function at heating Thermo-OFF (FA) Press PSW1 and select the setting of the condition “0” to “1” of the indoor unit fan control during the Thermo-OFF in heating mode “FA”. Normally, the fan speed is changed to “LOW” at heating Thermo-OFF. (There is a case that the room temperature is too high at the heating Thermo-OFF.) However, the indoor fan motor is operated at “LOW”...

  • Page 138: Cancellation Of The Outdoor Ambient Temperature Limit (Gs)

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.3.5 Cancellation of the outdoor ambient temperature limit (GS) Press PSW1 and select the setting condition “0” to “3” at the cancellation of outdoor ambient temperature limit of G5. Then this function can be set. The heating operation is continued under a high outdoor temperature or the cooling operation is continued under a low temperature.

  • Page 139: Defrost For Cold Area (Jo)

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.3.6 Defrost for cold area (J) Press PSW1 and select the setting condition “0” to “2” at the defrost for the cold area “J” to change the temperature condition for starting defrost operation Standard specifications Cold area specifications Warm area specifications Setting When change of defrost condition...

  • Page 140: Low Noise Setting (Db)

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.3.9 Low noise setting (db) Press PSW1 and select the setting condition “0” to “9” at the low noise setting “db” to reduce the upper limit compressor frequency and the outdoor fan motor rotation frequency. N O T E •...

  • Page 141: Wave Function Setting (Ue)

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.3.11 Wave function setting (UE) Press PSW3 and select the settings condition “0” to “1” to set wave function setting “UE”. The maximum running current limit changes from 40% to 80%, as shown in the attached figure. N O T E In the case that the demand current control by external input is set and the external input signal is available,this function is not available even when the demand current control by external input signal is performed.

  • Page 142: Power Saving Function From Wired Controller

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.4 Power saving function from wired controller 6.2.4.1 Power Saving Guide Press “ECO” button then the power saving guide will be displayed to support the setting. Easy access to the confirmation and setting screen from the current setting status screen. 6.2.4.2 Outdoor Unit Capacity Control The demand function setting can be controlled from wired controller.

  • Page 143: Rotation Control Function

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.4.3 Rotation control function The rotation control switches multiple indoor unit operating mode to FAN mode (Thermo-OFF) in order one by one. Order of fan operation Fan operation Cooling operation Indoor unit 1 Order of fan operation The indoor unit fan operation is performed...

  • Page 144: Power Saving Schedule Function

    6 Optional functions RAS-(4-6)H(V)(R/N)(C/P)2E 6.2.4.5 Power Saving Schedule Function The power saving schedule function is utilized to set the power saving schedule on indoor unit capacity control and intermittent control up to five settings a day each day of the week. The display of Noise Reduction Schedule is the same.

  • Page 145: Commissioning

    7 Commissioning C o m m i s s i o n i n g Index Preliminary checks ..........................144 Before the test run ..........................145 Test run using the PC-ARFP1E remote control switch (example) ............146 Test run from the outdoor unit ......................148 Checking at test run ..........................

  • Page 146: Preliminary Checks

    7 Commissioning Preliminary checks 7.1 Preliminary checks The test run must be performed according to the instructions in this chapter. D A N G E R Do not use the system until all the checkpoints have been verified. • Make sure that the refrigerant pipes and the communication cables between the outdoor and indoor units are connected to the same refrigerant cycle.

  • Page 147: Before The Test Run

    7 Commissioning Before the test run 7.2 Before the test run C A U T I O N • Disconnect all the power supply switches. • Use a multimeter and check that all the switches are disconnected. Before carrying out the test run, check that the unit is properly installed in accordance with the Installation and Operation Manual.

  • Page 148: Test Run Using The Pc-Arfp1E Remote Control Switch (Example)

    7 Commissioning Test run using the PC-ARFP1E remote control switch (example) 7.3 Test run using the PC-ARFP1E remote control switch (example) TURN ON SET UP If no indication or "00" appears or the number of the units indicated is less than the actual number of the units, there is an abnormality.
  • Page 149 7 Commissioning Test run using the PC-ARFP1E remote control switch (example) Step 3 Checking procedure for abnormalities Remote control Fault Inspection points after the power source OFF switch indication 1. Connection between Connector and Wires The power source is not turned ON 2.

  • Page 150: Test Run From The Outdoor Unit

    7 Commissioning Test run from the outdoor unit (*) Procedures for recovery when transmitting circuit fuse is blown out: a. Correct the wiring for the terminal board. b. Setting positions of the model code are shown below. Outdoor unit PCB Outdoor unit PCB Indoor unit PCB RAS-3HVRC2...
  • Page 151 7 Commissioning Test run from the outdoor unit Setting the DSW DSW301 for 3HP Operation Remarks DSW1 for 4-6HP 1. Setting the operation mode. 1. The indoor unit automatically Note that the indoor units operate in starts operating when the test run conjunction with the test run operation of the outdoor unit is set.

  • Page 152: Checking At Test Run

    7 Commissioning Checking at test run 7.5 Checking at test run 1 Indoor and outdoor fan. Check that the indoor and outdoor fan rotate properly and the airflow is smooth. 2 Power supply voltage. Check the power supply. If the power supply is abnormal, contact the electric power company. Usually, voltage drop will occur when starting the operation as shown in the figure (V2). In order to protect the device, comply with the following normal range of the power supply voltage.

  • Page 153: Refrigerant Cycle Checklist

    7 Commissioning Refrigerant cycle checklist b. When the high pressure retry control is activated, alarm code “P13” will be indicated on the 7 segment display of the outdoor unit PCB1. If the high pressure retry control occurs 3 times or more in 30 minutes, alarm code “45” will be indicated on the remote control LCD screen or on the 7 segment display of the outdoor unit PCB1.
  • Page 154 7 Commissioning Refrigerant cycle checklist b. Data samples (cooling/heating, indoor temperature 21 – 30 °C) Check item Result Check the operating data after it has been operating for 20 minutes. Check Pd and Td. Is Td-SH between 15 and 55 ºC? Is Ps between 0.15 and 1.3 MPa? Is Pd between 1.0 and 3.6 MPa? (If the outdoor temperature is high, Pd becomes high).
  • Page 155 7 Commissioning Refrigerant cycle checklist b. Heating operation (this is applicable when the outdoor temperature is higher than 0 °C). Check item Standard Causes Result • Low: excessive refrigerant. Is TdSH “15 - 55 ºC”? • High: insufficient refrigerant. 15 - 55 ºC TdSH = Td - Saturated vapor refrigerant •...

  • Page 156: Test Run Check List

    7 Commissioning Test run check list 7.7 Test run check list MODEL: SERIAL No.: COMPRESSOR MFG No.: NAME AND CUSTOMER ADDRESS: DATE: 1 Does the indoor unit fan rotation in the correct direction? __________ 2 Does the outdoor unit fan rotation in the correct direction? __________ 3 Can you hear strange noises in the compressor? 4 Has the unit been operating for at least twenty (20) minutes? __________ 5 Check the temperature of the room:...

  • Page 157: Electrical Checks Of Main Parts

    8 Electrical checks of main parts E l e c t r i c a l c h e c k s o f m a i n p a r t s Index Inverter ..............................156 8.1.1 RAS-(4-6)HV(R/N)(C/P)2E .......................... 156 8.1.2 RAS-(4-6)H(R/N)(C/P)2E ..........................

  • Page 158: Inverter

    8 Electrical checks of main parts Inverter TROUBLESHOOTING 8.1 Inverter (3) Inverter Part of Outdoor Unit PCB 8.1.1 RAS-(4-6)HV(R/N)(C/P)2E ● Detail of Check Points LED5 CN42 PCN30 AC-L1 PCN8 L-COM AC-N AC-L CAUTION Applicable power source 1~ 230V 50Hz Maximum output voltage 415V (Depends on power source voltage) ●...
  • Page 159 8 Electrical checks of main parts Inverter 3 Remove all the terminals of the inverter module before check. If all the items (below table) are performed and all items are satisfied, the inverter module is non-defective. Test Point Analog Tester Result Digital Tester Result (+) Side of Tester (-) Side of Tester AC-L1/AC-N L-COM...

  • Page 160: Ras-(4-6)H(R/N)(C/P)2E

    8 Electrical checks of main parts Inverter 8.1.2 RAS-(4-6)H(R/N)(C/P)2E Applicable power source 3N~ 400V 50Hz Maximum output voltage 415V (Depends on power source voltage) Maximum output current Control method Vector control PWM (Pulse width modulator) 11Hz to 130Hz Output frequency range 0 to 21.7rps Frequency accuracy 0.01 Hz...
  • Page 161 8 Electrical checks of main parts Inverter  IPM Circuit of Driver Board (In case of using Digital Tester) •  The positive side (+) of tester: Red; The negative side (-) of tester: Black. •  Pre-charge circuit of the Inverter PCBA. If the positive side (+) of tester is connected to DCL1, and the negative side (-) of tester is connected to CN28(P).

  • Page 162: Specifications Of Inverter

    8 Electrical checks of main parts Inverter 8.1.3 Specifications of inverter Applicable RAS-3HVRC2 RAS-(4-6)HV(R/N)(C/P)2E RAS-(4-6)H(R/N)(C/P)2E model Applicable 1 Phase. 230V 50 Hz 3 Phase 400V 50 Hz power source Output current 10.5A 20.0A 20.0A Control Vector control Method Range output 11-125Hz 11-130Hz 11-130Hz...
  • Page 163 8 Electrical checks of main parts Inverter Protection function Applicable RAS-3HVRC2 RAS-(4-6)HVNC1E RAS-(4-6)HNC1E model Excessive low voltage at a voltage is Excessive high Excessive low voltage at a voltage is lower than 194 V DC lower than 350 V DC or low voltage Excessive high voltage at a voltage is higher than 400 V DC Excessive high voltage at a voltage is...

  • Page 164: Inverter Time Chart

    8 Electrical checks of main parts Inverter 8.1.4 Inverter time chart Frequency Frequency LOW Main Circuit Main circuit Frequency  Power Source Frequency All bit 1 Operation All bit 1 operation All bit 1 All bit 1 power source HIGH HIGH Frequency Frequency ...
  • Page 165 8 Electrical checks of main parts Inverter 2 Abnormality of current sensor a. Level of detection When current of the inverter compressor decreases lower than 1.5A during the inverter compressor frequency between 15Hz and 18Hz an abnormality is detected. b. Function When abnormalities are detected the inverter compressor is stopped and transmit the signal code of stoppage cause to PCB1.

  • Page 166: Overload Control

    8 Electrical checks of main parts Inverter 5 Fin temperature increase a. Level of detection When the temperature of internal thermistor exceeds more than 80ºC (for 3HP), 90ºC (for 4 to 6HP) an abnorma- lity is detected. b. Function When abnormalities are detected the inverter compressor is stopped and the signal code of stoppage cause is transmitted to PCB1. c. Cancellation of protection function Transmission for signal code of stoppage cause is cancelled when a stopping order is issued or main power sour- ce is cut off 6 Earth detection...

  • Page 167: Thermistor

    8 Electrical checks of main parts Thermistor 8.2 Thermistor 8.2.1 Thermistors for RAS-3HVRC2 Thermistor for outdoor ambient temperature (THM7) Thermistor for discharge gas temperature (THM9) Thermistor for evaporating temperature (THM8) Thermistor for condensing temperature (THM10)  Thermistor for discharge gas temperature (THM9) For prevention of discharge gas overheating Thermistor resistance characteristics 72.3...

  • Page 168: Thermistors For Ras-(4-6)H(V)(R/N)(C/P)2E

    8 Electrical checks of main parts Thermistor  Thermistor for evaporating temperature of outdoor unit in heating operation (for defrosting) (THM8) Thermistor resistance characteristics 78.0 58.3 44.0 33.7 26.0 20.2 15.9 12.6 10.0 8.05 6.52 5.31 4.36 3.60 2.99 2.49 -15 -10 35 40 Temperature (ºC)
  • Page 169 8 Electrical checks of main parts Thermistor  Thermistor for discharge gas temperature (THM9) 1 A thermistor for the upper part temperature of the Thermistor resistance characteristics compressor is installed to prevent discharge gas from overheating. If discharge gas temperature increases excessively lubricating oil deterioration occurs and lubricating properties deteriorate resulting in short compressor life.
  • Page 170 8 Electrical checks of main parts Thermistor  Thermistor for evaporating temperature of outdoor unit in heating operation (for defrosting) (THM8) Thermistor resistance characteristics 78.0 58.3 44.0 33.7 26.0 20.2 15.9 12.6 10.0 8.05 6.52 5.31 4.36 3.60 2.99 2.49 -15 -10 35 40 Temperature (ºC)

  • Page 171: Electronic Expansion Valve

    8 Electrical checks of main parts Electronic expansion valve 8.3 Electronic expansion valve Micro-computer Pulse signal 2-phase permanent magnetic pulse motor Control 0 to 500 pulse by 1 pulse Refrigerant flow control 1. Pulse motor. Precise control 2. Needle. Items Specifications Type UKV series Refrigerant R32 / R410A...

  • Page 172: High Pressure Protection Device

    8 Electrical checks of main parts High pressure protection device 8.4 High pressure protection device 8.4.1 RAS-3HVRC2 If the discharge pressure is excessively high the compressor and the component parts of the refrigeration cycle can be damaged. Therefore, in case that the discharge pressure is higher than 4.15 MPa the protection control is activated and the compressor is stopped.: In case that the discharge pressure is higher than 3.6 MPa the protection control might be performed.

  • Page 173: Noise Filter (Nf)

    8 Electrical checks of main parts Noise filter (NF) 8.5 Noise filter (NF) The noise filter decreases the noise caused by the inverter to the power supply line. The terminals that indicate “LOAD”  are connected to the inverter and terminals that indicate “LINE” are connected to the power supply line. RAS-(4-6)H(R/N)(C/P)2E Items Specifications Model NF167ES Rated Current AC 400 V Rated Current Circuit diagram Z1,2,3 R2 R3...

  • Page 174: Reactor (Dcl)

    8 Electrical checks of main parts Reactor (DCL) 8.6 Reactor (DCL) This part is used for changing alternating current to direct current for the inverter. 8.6.1 RAS-3HVRC2 Items Specifications Character 12 mH±15 (at 1 kHz) Rated current 15 A DC Resistance 160 mΩ (max.) Permissible temperature range -25ºC to 60ºC...

  • Page 175: Rotary Compressor

    8 Electrical checks of main parts Rotary compressor 8.7 Rotary compressor •  Low vibration and low noise design •  (i) The twin rotor crankshaft is arranged in a symmetrical type, which counteracts the centrifugal force produced by the rotation, and the vibration is smaller. • ...

  • Page 177: Servicing

    9 Servicing S e r v i c i n g Index Safety Introduction ..........................176 RAS-3HVRC2............................177 9.2.1 Removing the pipe cover ..........................177 9.2.2 Removing the front cover ..........................177 9.2.3 Removing the outdoor fan ........................... 178 9.2.4 Removing the compressor .......................... 179 9.2.5 Removing the high pressure switch and pressure switch for control ............

  • Page 178: Safety Introduction

    9 Servicing Safety Introduction 9.1 Safety Introduction D A N G E R DO NOT TOUCH THE ELECTRICAL COMPONENTS WHILE LEDS 1~4/351~353 on PCB1 or LD1~4 on PCB2 ARE ON, TO AVOID ELECTRICAL SHOCK. WAIT UNTIL ALL LEDS TURN OFF. D A N G E R •...

  • Page 179: Ras-3Hvrc2

    9 Servicing RAS-3HVRC2 9.2 RAS-3HVRC2 9.2.1 Removing the pipe cover Follow the procedure below to remove main parts and components. For mounting follow the reverse procedure of removal. Do not expose the refrigerant cycle to the atmosphere for a long period to avoid moisture or dust entering into the cycle. Be sure to replace parts immediately after removing.

  • Page 180: Removing The Outdoor Fan

    9 Servicing RAS-3HVRC2 9.2.3 Removing the outdoor fan 1 Remove the pipe cover following “9.2.1 Removing the pipe cover”. 2 Remove 3 fixing screws and remove the upper cover. 3 Remove the front cover following “9.2.2 Removing the front cover”. 4 To remove the propeller fan remove the cap nut which fixes the propeller fan onto the motor shaft. N O T E •...

  • Page 181: Removing The Compressor

    9 Servicing RAS-3HVRC2 9.2.4 Removing the compressor N O T E • Do not expose the refrigerant cycle to the atmosphere for a long period to avoid moisture or dust into the cycle. Be sure to replace the compressor immediately after removing. Seal to the suction and discharge pipes when the refrigerant cycle is left unattached for a prolonged time. • Remove the cap of new compressor right before the replacement. Before mounting the compressor seal the suction and discharge pipes with a tape to protect the compressor from dust. Remove the tape at pipe connection. • To connect wiring at reassembling ensure that the compressor terminal numbers and wiring mark band codes are matched. Incorrect wiring numbers may result in inverse rotation and damage the compressor. 1 Remove the pipe cover following “9.2.1 Removing the pipe cover”. When the outdoor unit is installed close to a wall move the unit from the wall removing the refrigerant piping. 2 Collect the refrigerant from the check joint.
  • Page 182 9 Servicing RAS-3HVRC2 7 Remove the suction and discharge pipes from the compressor. Be sure to separate the blazing burner flame sufficiently from the wires and electrical components around the brazed part in order to avoid burning. 1- Blazing Discharge pipe. 2 - Blazing Suction pipe. 8 Remove push nuts 1 and 2 which fixes the compressor. Lift the compressor and remove from the unit body. (3 in the figure does not have a push nut).

  • Page 183: Removing The High Pressure Switch And Pressure Switch For Control

    9 Servicing RAS-3HVRC2 9.2.5 Removing the high pressure switch and pressure switch for control 1 Remove the pipe cover following “9.2.1 Removing the pipe cover”. High pressure Pressure 2 Remove 5 fixing screws and remove the upper cover. switch switch for 3 Remove the front cover following control “9.2.2 Removing the front cover”.

  • Page 184: Removing The Electronic Expansion Valve Coil

    9 Servicing RAS-3HVRC2 9.2.7 Removing the electronic expansion valve coil 1 Remove the pipe cover following “9.2.1 Removing the pipe cover”. 2 Remove 5 fixing screws and remove the upper cover. 3 Remove the front cover following “9.2.2 Removing the front cover”. 4 Remove the electrical box cover. 5 Remove 8 fixing screws and remove the side cover.

  • Page 185: Removing Display Pcb

    9 Servicing RAS-3HVRC2 9.2.9 Removing Display PCB 1 Remove the pipe cover following “9.2.1 Removing the pipe cover”. 2 Remove 1 fixing screw and remove the terminal cover. 3 Disconnect all the wiring connected to the display PCB. 4 Hold the upper part of 4 holders with long nose pliers and remove the display PCB.

  • Page 186: Ras-(4-6)H(V)(R/N)(C/P)2E

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 9.3 RAS-(4-6)H(V)(R/N)(C/P)2E 9.3.1 Removing service cover N O T E • Follow the procedure below to remove main parts and components. For mounting follow the reverse procedure of removal. • Do not expose the refrigerant cycle to the atmosphere for a long period to avoid moisture or dust entering into the cycle. Be sure to replace parts immediately after removing. Seal the refrigerant cycle when left unattached for a long period. Service Cover 1 Pull downward and remove the service cover after removing 4 upper and lower fixing screws. • Pay attention not to drop the service cover. Service cover 9.3.2 Remove outlet grille Service Cover...

  • Page 187: Removing Bottom Service Cover And Rear Cover

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 9.3.4 Removing bottom service cover and rear cover 1 Remove 5 screws which fix the bottom service cover. 2 Pull and remove the bottom service cover. 3 Remove the upper cover following “9.3.3 Removing upper cover”. 4 Remove 8 screws which fix the rear cover. 5 Pull backward and remove the rear cover.

  • Page 188: Removing Electrical Box

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 7 Remove 4 screws which fix the motor. Model RAS-(4-6)H(V)(R/N)(C/P)2E Connector pin location Inverter PCB - CN406 Motor fixing screws 4x M5 screws 1. Motor clamp 2. Fan motor lead wire 3. Plastic band 4. Fan motor N O T E 1. To mount the motor be sure to place the lead wire outlet downward. (Adjust the propeller fan and shroud not to contact with each other).
  • Page 189 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E CN406 PCN8 PCN5 PCN100 PCN7 PCN10 CN5A THM9 THM7 THM8 C A U T I O N The electrical box is a heavy component, two personnel are recommended to handle it. SMGB0136 rev.0 - 07/2021...
  • Page 190 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 5 Pull up the electrical box -A- or -B- through the upper support -2- until it is free and can be removed from the front. 6 Disassembly the valve coils according to the items. “9.3.9 Removing 4-way valve coil” “9.3.10 Removing electronic expansion valve coil” “9.3.11 Removing solenoid valve coil (SVA)” 7 Disassembly the thermistors according to the items.

  • Page 191: Removing The Compressor

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E N O T E The figure corresponds to a RAS-(4-6)H(R/N)(C/P)2E unit. 11 Mount the 6 fixing screws -1- of the electrical box. 12 Assembly the service cover according to the item “9.3.1 Removing service cover”. 13 Assembly the upper cover according to the item “9.3.3 Removing upper cover”. 9.3.7 Removing the compressor 1 Disassembly the service cover according to the item “9.3.1 Removing service cover”.
  • Page 192 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 6 Identify and disconnect the compressor wires and the thermostat -2- in the terminal box on top of the compressor. 7 Remove the crankcase heater -4-. 8 Protect the nearest thermistor -5- with a wet cloth. 9 Close the check joints -2- and -6-. 10 Charge the check joint -1- with nitrogen and refill the compressor piping.
  • Page 193 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 15 Remove the vibration-proof rubber -2- and the vibration-proof rubber -3-. C A U T I O N • To remove the compressor the liquid stop valve pipe should be moved (bent) to the right side hand. PAY CLOSE ATTENTION not to crush to break the pipe. • The compressor is a heavy component, two personnel are recommended to handle it. 16 Remove the compressor by lifting it up with inclining forward. 17 Install the new vibration-proof rubber -3-. C A U T I O N •...
  • Page 194 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 23 Braze the connection -2- between the compressor and the pipes with a brazing unit. 24 Install the vibration-proof rubber and thigten the 2 nuts for fixing the compressor. Tightening Torque: 6 Nm C A U T I O N Incorrect wiring numbers may result in inverse rotation and damage of the compressor.

  • Page 195: Removing The High Pressure Switch And Pressure Switch For Control

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 9.3.8 Removing the High pressure switch and Pressure switch for control 1 Disassembly the service cover according to the item “9.3.1 Removing service cover”. 2 Disassembly the bottom service cover and rear cover according to the item “9.3.4 Removing bottom service cover and rear cover”. 3 Collect the refrigerant according to the item “3.4 Refrigerant charge”. If the outdoor unit is installed close to a wall remove the refrigerant piping and move the unit from the wall.
  • Page 196 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E i. Braze the connection -4- to the Discharge Pipe -2- until the sensor is properly installed. j. Allow the brazing to cool down for a few minutes. k. Remove all used protections and wet cloths. l. Move the cables until they are the same as they were originally. m.

  • Page 197: Removing 4-Way Valve Coil

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 9.3.9 Removing 4-way valve coil 1 Remove the service cover, the bottom service cover, the rear cover and the upper cover following “9.3.1 Removing service cover”, “9.3.4 Removing bottom service cover and rear cover” “9.3.3 Removing upper cover”. 2 Disconnect the connector on the control PCB of the electrical box.

  • Page 198: Removing Solenoid Valve Coil (Sva)

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 11 Assembly the rear cover according to the item “9.3.4 Removing bottom service cover and rear cover”. 12 Assembly the service cover according to the item “9.3.1 Removing service cover”. 9.3.11 Removing solenoid valve coil (SVA) 1 Disassembly the service cover according to the item “9.3.1 Removing service cover”. 2 Disconnect the PCN7 connector on the control PCB1 of the electrical box. 3 Cut the necessary plastic ties to remove the solenoid valve coil wire.

  • Page 199: Removing Electronic Expansion Valve

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 10 Remove the pipes from the reversing valve. 11 Seal the pipes with a tape to protect the reversing valve and the cycle assembly from dust. 12 Remove reversing valve -1- from the assemblies and install the new one. 13 Protect the new reversing valve -1- with a wet cloth.

  • Page 200: Removing Solenoid Valve

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 13 Braze the connections -3- between the expansion valve -2- and the piping until the valve is properly installed. 14 Allow the brazing to cool down for a few minutes. 15 Remove all used protections and wet cloths. 16 Assembly the Electronic expansion valve coil -1- according to the item “9.3.10 Removing electronic expansion valve coil”.

  • Page 201: Disassembly / Assembly The Electrical Components For Ras-(4-6)Hv(R/N)(C/P)2E

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 15 Remove all used protections and wet cloths. 16 Move the cables until they are the same as they were originally. 17 Assembly the solenoid valve coil -1- according to the item “9.3.11 Removing solenoid valve coil (SVA)”. 18 Charge new refrigerant according to the item “3.4 Refrigerant charge”. 19 Assembly the electrical box according to the item “9.3.6 Removing electrical box”.
  • Page 202 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E  Disassembly / Assembly the Inverter module (PCB1) 1 Disassembly the upper cover according to the item “9.3.3 Removing upper cover”. 2 Open the electrical box according to the item “Opening / Closing Electrical box (P plate)”. 3 Disconnect all the wiring connected to the control PCB. 4 Remove the 4 fixing screws -1-.
  • Page 203 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E  Disassembly / Assembly the PCB3 1 Disassembly the service cover according to the item “9.3.1 Removing service cover”. 2 Disconnect all the wiring connected to the PCB. 3 Remove the 4 fixing holders -2- and disassembly the PCB -1-. 4 Assembly the new control PCB -1- and fix it with 4 holders -2-.
  • Page 204 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E  Disassembly / Assembly the Terminal Board (TB) 1 Disassembly the service cover according to the item “9.3.1 Removing service cover”. 2 Disconnect the wirings of terminal board. 3 Remove the 2 fixing screws -2- and disassembly the terminal board -1-. 4 Assembly the new terminal board -1- and fix it with 2 screws -2-.
  • Page 205 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E  Disassembly / Assembly DCL 1 Open the electrical box according to the item “Opening / Closing Electrical box (P plate)”. 2 Disconnect the wirings and cut the plastic ties that fixes the lead wire from PCB1. L-COM 3 Remove the 5 fixing holders -2- and disassembly the DCL -1-. 4 Disassembly the DCL and the wiring.

  • Page 206: Disassembly / Assembly Electrical Components For Ras-(4-6)H(R/N)(C/P)2E

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 9.3.16 Disassembly / Assembly Electrical components for RAS-(4-6)H(R/N)(C/P)2E D A N G E R Check that all the LEDs on the inverter PCB (PCB2) are OFF. If necessary, wait a few minutes until all the LEDs are completely switched OFF.
  • Page 207 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E  Disassembly / Assembly the control PCB (PCB1) 1 Disassembly the service cover according to the item “9.3.1 Removing service cover”. 2 Disconnect all the wiring connected to the control PCB. 3 Remove the 6 fixing holders -2- and disassembly the control PCB -1-. 4 Assembly the new control PCB -1- and fix it with 6 holders -2-.
  • Page 208 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 7 Connect all the wiring desconnected to the control PCB as it was originally. 8 Close the electrical box according to the item “Opening / Closing Electrical box (P plate)”. 9 Assembly the upper cover according to the item “9.3.3 Removing upper cover”.  Disassembly / Assembly the PCB3 1 Open the electrical box according to the item “Opening / Closing Electrical box (P plate)”.
  • Page 209 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E  Disassembly / Assembly the terminal board (TB) 1 Disassembly the service cover according to the item “9.3.1 Removing service cover”. 2 Disconnect the wirings of terminal board -1-. 3 Remove the 2 fixing screws -2- and disassembly the terminal board -1-. 4 Assembly the new terminal board -1- and fix it with 2 screws -2-.
  • Page 210 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E C A U T I O N To connect wiring at reassembling, ensure that the terminal numbers and wiring mark band codes are matched. If connections are wrong, there is the possibility of wrong operation and to cause damage to electrical parts. 6 Connect all the wiring connected to the control PCB and fix it as it was originally. 7 Close the electrical box according to the item “Opening / Closing Electrical box (P plate)”.  Disassembly / Assembly the Noise filter 1 Open the electrical box according to the item “Opening / Closing Electrical box (P plate)”.

  • Page 211: Removing Pipe Thermistors

    9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E 9.3.17 Removing pipe thermistors  THM9 - Thermistor for discharge gas temperature (Td) 1 Disassembly the service cover according to the item “9.3.1 Removing service cover”. 2 Cut the plastic tie -1-. 3 Remove the butyl sheet -2-. 4 Pull out the thermo spring -3- from the feeler pipe. 5 Remove the aluminium tape -5- and disassembly the thermistor -4-.
  • Page 212 9 Servicing RAS-(4-6)H(V)(R/N)(C/P)2E  THM7 - Thermistor for outdoor ambient temperature (Ta) 1 Remove the fixing screw -1- of the thermistor plate -2-. 2 Unclip the thermistor -3- from the plate -4- and remove the thermistor plate -2-. 3 Disassembly the rear cover according to the item “9.3.4 Removing bottom service cover and rear cover”. 4 Disassembly the service cover according to the item “9.3.1 Removing service cover”.

  • Page 213: Troubleshooting

    10 Troubleshooting 1 0 . T r o u b l e s h o o t i n g Index 10.1 Initial troubleshooting .......................... 213 10.1.1 RAS-3HVRC2 ............................213 10.1.1.1 Simple checking procedure by means of the 7-segment display ..........213 10.1.1.2 Power supply failure to the indoor unit and the remote control switch (PC-ARFP1E) ....
  • Page 214 10 Troubleshooting 10.4.2 RSW, DSWs and LEDs functions RAS-(4-6)HV(R/N)(C/P)2E ..............316 10.4.2.1 Location of print circuit boards (PCBs) ..................316 10.4.2.2 Purpose ............................316 10.4.3 RSW, DSWs and LEDs functions RAS-(4-6)H(R/N)(C/P)2E ..............319 10.4.3.1 Location of print circuit boards (PCBs) ..................319 10.4.3.2 Purpose ............................

  • Page 215: Initial Troubleshooting

    10 Troubleshooting Initial troubleshooting 10.1 Initial troubleshooting 10.1.1 RAS-3HVRC2 10.1.1.1 Simple checking procedure by means of the 7-segment display 1 Turn on the indoor unit connected to the outdoor unit. 2 Turn on the outdoor unit 3 Auto-addressing starts. (Outdoor unit printed circuit board PCB1). During the auto-addressing, the following items can be checked by means of the 7-segment display of the outdoor unit.

  • Page 216: Abnormal Operation Of The Devices

    10 Troubleshooting Initial troubleshooting 10.1.1.3 Abnormal operation of the devices Action Phenomenon Cause Check item (Turn OFF the main switch) Failure of Failure of thermistor thermistor for outdoor Replace or correctly connect when it is abnormal Disconnected wire of evaporating thermistor temperature during heating...
  • Page 217 10 Troubleshooting Initial troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Clogging of the outdoor unit Remove the clogging heat exchanger? Obstacles at the inlet or the Insufficient air flow at outlet of the outdoor unit heat Remove the obstacles the outdoor unit heat exchanger exchanger...
  • Page 218 10 Troubleshooting Initial troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Indoor heat load is greater than the heating Replace the unit with a Calculate the heat load capacity bigger unit Gas leakage or Correctly charge the insufficient refrigerant Measure superheat refrigerant after the gas...

  • Page 219: Ras-(4-6)H(V)(R/N)(C/P)2E

    10 Troubleshooting Initial troubleshooting Action Phenomenon Cause Check item (Turn OFF the main switch) Foreign particles inside of the fan casing Visually inspect it Remove the foreign particles Outdoor unit propeller fan is hitting the Adjust the position of the Visually inspect it shroud propeller fan...

  • Page 220: Checking By 7-Segment Display

    10 Troubleshooting Initial troubleshooting 10.1.2.2 Checking by 7-segment display • Turn ON the main power supply. Wait for more than 20 seconds to start checking. • Checking Items Expansion Valve Opening Temperature Readings from Thermistors Number of Indoor Units Connecting in the Same System • Check the locations of 7-segment and push switches.
  • Page 221 10 Troubleshooting Initial troubleshooting  Checking of the alarm code history Abnormal Data Record “Abnormal Data Record” (n1 ~ n9) in checking item can record recent abnormal stoppages. (The maximum number of recordable is n9, n1 is the latest one.) In case of abnormal stoppage in following table, accumulated operation time when abnormality happened, alarm code/cause code of ID stoppage, and cause code of inverter/fan stoppage are recorded: For example:...
  • Page 222 10 Troubleshooting Initial troubleshooting  Alarm code history record Cause Code of Inverter/Fan Alarm Code or Stoppage Cause Code of I.D. Contents Stoppage Activation of protection device (High Pressure Cut) Abnormality communication between inverter PCB and outdoor unit PCB Abnormality of power supply phase Activation of inverter voltage increase/decrease protection 5, 6 d1-18...

  • Page 223: Failure Of The Power Supply To Indoor Units And The Remote Control Switch

    10 Troubleshooting Initial troubleshooting 10.1.2.3 Failure of the power supply to indoor units and the remote control switch • The lights and the LCD are not indicated. • Inoperative. If the fuses are blown or the circuit breaker is activated, investigate the cause of the excessive current and take the necessary measures.

  • Page 224: Abnormal Transmission Between Remote Control Switch And Indoor Unit

    10 Troubleshooting Initial troubleshooting 10.1.2.4 Abnormal transmission between remote control switch and indoor unit • The RUN indicator on the remote control: Flashes every two seconds. Action (Turn OFF Cause Phenomenon Check Item Main Switch) Check cables and Disconnection or contact failure of controller cable Replace or repair them connection Check it in self-checking...

  • Page 225: Abnormal Operation Of The Devices

    10 Troubleshooting Initial troubleshooting 10.1.2.5 Abnormal operation of the devices In the case no anomalies are detected (alarm codes) in the remote control switch, and normal operation is not available, carry out the required actions in accordance with the procedures described below. Action (Turn OFF Phenomenon Check Item...
  • Page 226 10 Troubleshooting Initial troubleshooting Action (Turn OFF Check Item Phenomenon Cause Main Switch) Check Setting Condition of “Thermistor of Remote Control Switch” by Optional Setting *Setting and Control “00”: Control by Indoor In case that thermistor of Thermistor for Suction Air Incorrect optional setting remote control switch is not used, set at “00”.
  • Page 227 10 Troubleshooting Initial troubleshooting Action (Turn OFF Phenomenon Cause Check Item Main Switch) Failure of Thermistor Failure of Discharge Air Check thermistor in check mode Replace or correctly connect Temperature of remote control switch (*) wiring when it is abnormal Disconnected Thermistor Wire of...
  • Page 228 10 Troubleshooting Initial troubleshooting Action (Turn OFF Phenomenon Cause Check Item Main Switch) Indoor heat load is larger than Calculate heat load Use larger unit cooling capacity Gas leakage Correctly charge refrigerant or shortage of Measure superheat after repairing gas leakage refrigerant Excessively small diameter...
  • Page 229 10 Troubleshooting Initial troubleshooting Action (Turn OFF Phenomenon Cause Check Item Main Switch) Check clogging of Outdoor Remove clogging Unit Heat Exchanger Obstacles at inlet or outlet of Remove obstacles Insufficient air outdoor unit heat exchanger? flow to outdoor unit heat Is service space for outdoor exchanger Secure service space unit sufficient?
  • Page 230 10 Troubleshooting Initial troubleshooting Action (Turn OFF Phenomenon Cause Check Item Main Switch) Transmission Check indoor unit indicating failure between Repair it according to alarm alarm code “03” on wired code “03” indoor unit and controller outdoor unit Insufficient Repair it according to Check wired controller LCD Insufficient Transmission...
  • Page 231 10 Troubleshooting Initial troubleshooting Action (Turn OFF Phenomenon Cause Check Item Main Switch) Indoor Heat Load is greater than Calculate heat load Use a bigger unit Heating capacity Gas leakage or insufficient Correctly charge refrigerant Measure superheat after repairing gas leakage refrigerant charge Excessively...
  • Page 232 10 Troubleshooting Initial troubleshooting Action (Turn OFF Cause Check Item Phenomenon Main Switch) Transmission Check indoor unit indicating failure between Repair it according to alarm alarm code “03” on wired indoor unit and code “03” controller outdoor unit Repair it according to Insufficient Check wired controller LCD Insufficient...
  • Page 233 10 Troubleshooting Initial troubleshooting Action (Turn OFF Phenomenon Cause Check Item Main Switch) Remove clogging Check for filter clogging Insufficient air flow to indoor Check for any obstacles at Remove obstacles unit heat inlet or outlet of indoor unit exchanger Check indoor fan speed Replace fan motor Excessively high air temperature Check short-circuited air to...
  • Page 234 10 Troubleshooting Initial troubleshooting Action (Turn OFF Check Item Phenomenon Cause Main Switch) Foreign particles inside of fan casing Check it by viewing Remove foreign particles Indoor unit fan runner is hitting casing Check it by viewing Adjust position of fan runner Outdoor unit propeller fan is hitting Check it by viewing Adjust position of propeller fan...
  • Page 235 10 Troubleshooting Initial troubleshooting Action (Turn OFF Cause / Check Item Phenomenon Main Switch) “Motion sensor is activated” is NOT indicated on wired Check connection of connector Connect it securely controller LCD. Check reaction rate (Check mode 1:q1) Replace motion sensor (reaction rate is always 0%: abnormal) Operation stops though someone is present...

  • Page 236: Troubleshooting Procedure

    10 Troubleshooting Troubleshooting procedure 10.2 Troubleshooting procedure 10.2.1 RAS-3HVRC2 10.2.1.1 Alarm codes for the outdoor units Retry Alarm stop Origin Detail of Abnormality Main Factors code code Activation of PSH, locked motor, abnormal operation in the power supply phase. Outdoor Activation of protection device (high Failure of fan motor, drain discharge, PCB, relay, float switch –...
  • Page 237 10 Troubleshooting Troubleshooting procedure  Cause of compressor stop When the compressor stops due any of the factors below, Stop Reason Code (d1 Code) is sent to Indoor Unit. The Code will be overridden when another Code is sent before it. Stop reason 52C1 Stop factors...

  • Page 238: Troubleshooting By Alarm Code

    10 Troubleshooting Troubleshooting procedure 10.2.1.2 Troubleshooting by alarm code Activation of the safety device (high pressure switch) in the outdoor unit (Except Alarm Alarm code codes 41 and 42) This alarm is indicated when one of the safety devices is activated during compressor running. Is it connected to Correctly plug connector connector PCN401 of...
  • Page 239 10 Troubleshooting Troubleshooting procedure Action (Turn OFF the Phenomenon Cause Check item main switch) Check the heat Remove the dust or the exchanger for dust or for clogging clogging Check the air filter for Remove the dust dust Outdoor Unit: Check for any obstacles Insufficient Air Flow to the Heat Exchanger (Outdoor at the inlet or the outlet of Remove the obstacles...
  • Page 240 10 Troubleshooting Troubleshooting procedure Alarm code Abnormal transmission between the indoor units and the outdoor unit • This alarm is displayed when an abnormal operation is maintained for three minutes after the normal transmission between the indoor units and the outdoor unit. Also, an abnormal operation is maintained for 30 seconds after the micro-computer is automatically reset.
  • Page 241 10 Troubleshooting Troubleshooting procedure Is DSW5-1P (terminal Set it correctly resistance on PCB1) ON? Is the voltage Check the fuses of the Is LED1 (red) on between the terminal outdoor unit power PCB1 ON? “1” and “3” of PCB1 220V supply or 240V? *2) Is connector (PCN2,...
  • Page 242 10 Troubleshooting Troubleshooting procedure Action Phenomenon Cause Check item (Turn OFF the main switch) Measure the voltage by means Power failure or power is not ON Supply the power of the tester Check the insulation material Remove the short-circuit and Short-circuit between the wires for breaks replace the fuse...
  • Page 243 10 Troubleshooting Troubleshooting procedure Alarm code Abnormal transmission between control PCB and inverter PCB in outdoor unit This alarm is displayed when the abnormal operation is maintained for 30 seconds after the normal transmission between the outdoor unit PCB1 and inverter PCB2. Also, the abnormal operation is maintained for 30 seconds after the micro-computer is automatically reset.
  • Page 244 10 Troubleshooting Troubleshooting procedure Alarm code Code abnormal operation of picking up phase signal This alarm is displayed when the main power source phase is reversely connected or one phase is not connected. Single phase and 3 phases Correctly connect each phase of the power source (Is there any phase which PCB1 is normal...
  • Page 245 10 Troubleshooting Troubleshooting procedure Alarm code Excessively low voltage or excessively high voltage for the inverter (RAS-3HVRC2) This alarm code is displayed when the voltage between terminal “P” and “N” of Inverter is insufficient and the alarm has three occurrences in 30 minutes. If the number of occurrences is smaller than two, the retry operation is performed. The alarm code “06.” Means fan controller Abnormal Operation. Restart the operation Is the power Check the wiring and...
  • Page 246 10 Troubleshooting Troubleshooting procedure Alarm code Decrease of Discharge Gas Superheat This alarm code is indicated as follows: The temperature on the top of the compressor is less than the target and also the IU expansion valve opening is under 300 pulses at cooling operation for 30 minutes. The temperature on the top of compressor is less than the target and also the OU expansion valve opening is under 70 pulses at heating operation for 30 minutes.
  • Page 247 10 Troubleshooting Troubleshooting procedure Action Phenomenon Cause Check item (Turn OFF the main switch) Refrigerant cycle is different from the Check refrigerant cycle and the Repair wiring electrical system electrical system Overcharged refrigerant Measure pressure Correctly charge refrigerant Check expansion valve. Refer to Replace expansion valve if Faulty Expansion Valve “8.3 Electronic expansion valve”...
  • Page 248 10 Troubleshooting Troubleshooting procedure Alarm code Excessively high discharge gas temperature at the top of compressor • The alarm appears during cooling operation when the compressor-top thermistor temperature remains at Tdc1 or above for 10 minutes, or at Tdc2 or above for 5 seconds. • The alarm appears during heating operation when the compressor-top thermistor temperature remains at Tdh1 or above for 10 minutes, or at Tdh2 or above for 5 seconds.
  • Page 249 10 Troubleshooting Troubleshooting procedure Abnormality of thermistor for discharge gas temperature (compressor Alarm code thermistor) • This alarm code is indicated when the thermistor is short-circuited (less than 1 kΩ) or cut (higher than 640 kΩ) during the cooling or the heating process. • This alarm forces all operations to stop (Outdoor &...
  • Page 250 10 Troubleshooting Troubleshooting procedure Abnormal operation of the thermistor for the outdoor temperature Alarm code (outdoor unit ambient thermistor) (THM7) • This alarm code is displayed when the thermistor is short-circuited (less than 0.2 kΩ) or cut (greater than 500 kΩ) during the operation. • This alarm forces all operations to stop (Outdoor & Indoor Units). • The unit should be stopped to release the alarm. Outdoor unit ambient thermistor (THM7) Is the thermistor THM7...
  • Page 251 10 Troubleshooting Troubleshooting procedure Abnormal operation of the thermistor for the evaporating temperature during the Alarm code heating process (outdoor unit) (THM8/THM10) The evaporating / condensing thermistor during the heating process is attached to the heat exchanger as shown in the figure below. If this thermistor is faulty, such as short-circuit (less than 0,2kΩ) or cut (more than 500kΩ) during eight minutes continuously, this alarm is displayed.
  • Page 252 10 Troubleshooting Troubleshooting procedure Incorrect capacity setting or combined capacity between indoor unit and outdoor Alarm code unit • This alarm code is indicated when the undefined setting is set to DSW3 on the outdoor unit PCB or to DSW2 on indoor unit PCB1. • This alarm code is indicated when the total indoor unit capacity is not equal to the combined outdoor unit capacity. Outdoor unit capacity setting is not correct.
  • Page 253 10 Troubleshooting Troubleshooting procedure Incorrect capacity setting or combined capacity between indoor unit and outdoor Alarm code unit • The alarm code appears from 3 to 5 minutes after the outdoor unit power activation if any inconsistency according to capacity is detected between indoor unit and outdoor unit. This applies when indoor unit capacity has no coincidence with outdoor unit capacity • This alarm forces all operations to stop (Outdoor &...
  • Page 254 10 Troubleshooting Troubleshooting procedure Activation to Protect System from Excessively Low Suction Pressure Alarm code (Protection from Vacuum Operation) • In the case that the evaporating temperature (Cooling: Liquid Refrigerant Piping Temperature of Indoor Unit, Heating: Evaporating Temperature of Outdoor Unit) is lower than -37 ºC (250~350 kΩ) and the thermistor on top of compressor is higher than 90 ºC for 10 minutes, retry operation is performed 3 minutes after compressor stoppage. However, when the state occurs more than 3 times including 3 in one hour, this alarm code is indicated.
  • Page 255 10 Troubleshooting Troubleshooting procedure Alarm code Overcurrent protection activation Turn OFF power and check LED1 is OFF. Disconnect relay Is there any cause of Restart operation. connectors from compressor. Check the instantaneous voltage Does it trip soon? Turn ON number 1 of DSW301 on compressor decrease? inverter PCB2 and restart.
  • Page 256 10 Troubleshooting Troubleshooting procedure Alarm code Abnormal operation of the current sensor. • This alarm code is displayed when the current transformer is abnormal (0 A detection or 3 A alarm condition) and the alarm has more than three occurrences in 30 minutes. • Condition of activation: When the frequency of compressor is maintained at 6 to 10Hz (3HP) after compressor is started, one of the absolute value of running current at each phase is ≤...
  • Page 257 10 Troubleshooting Troubleshooting procedure Alarm code Activation of transistor module • ISPM has a detection function of the abnormal operation. This alarm is displayed when the ISPM module detects the abnormal operation 7 times or more than 7 times in 30 minutes. The retry operation is performed six times. • Condition of activation: The abnormal current to the ISPM, such as short-circuited, grounded, overcurrent or control voltage decrease.
  • Page 258 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of the inverter fin temperature • This alarm code is indicated after the operation is stopped when the following conditions occur three times within 30 minutes. The retry operation is performed twice. • Conditions of activation: When the temperature of the thermistor for inverter fin exceeds 80 °C. • This alarm forces all operations to stop (Outdoor & Indoor Units). • The unit should be stopped to release the alarm.
  • Page 259 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of inverter module • Actual frequency from Inverter PCB is less than 10 Hz (after inverter frequency output form PCB1 to Inverter PCB). • This alarm is displayed when it occurs 3 times in 30 minutes. Retry operation is performed up to the occurrence of 2 times.
  • Page 260 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of fan motor protection (DC fan motor) • This alarm is indicated when the revolution pulse output from the fan motor is lower than 20min-1 during 30 seconds and it stops. Regarding stops, when less than 35 seconds have passed since fan start up, after the first abnormality is detected, if its occurs 4 times more within 5 minutes, it stops and alarm is displayed. Restart operation.
  • Page 261 10 Troubleshooting Troubleshooting procedure Alarm code "Momentary power interruption" or "Low voltage detected" • This alarm is displayed to indicate a momentary power interruption or a low voltage detected during compressor operation. A brief power interruption (which may not cause the reset of the microcomputer), may cause, instead, the relay Y52C or the CMC (Contactor for Compressor Motor) to release.

  • Page 262: Ras-(4-6)H(V)(R/N)(C/P)2E

    10 Troubleshooting Troubleshooting procedure 10.2.2 RAS-(4-6)H(V)(R/N)(C/P)2E 10.2.2.1 Alarm codes of wired controller • The RUN indicator (red) flashes on the remote control switch. • The unit number, the alarm code and the unit model code and the number of connected indoor units are alternatively displayed on the LCD, and the indoor unit number and the alarm code are displayed on the 7-segment display of outdoor unit PCB1.
  • Page 263 10 Troubleshooting Troubleshooting procedure Code Category Content of Abnormality Leading Cause Abnormality of Indoor Fan Motor (Step-Out), Abnormality of Indoor Fan System Indoor Fan Controller Failure Indoor Fan Motor Activation of Protection Device for Indoor Fan Motor Overheat, Lockup Abnormality of Fan Controller Fin Abnormality of Fin Thermistor or Fan Controller, Temperature Heat Exchanger Clogging, Abnormality of Fan Motor...
  • Page 264 10 Troubleshooting Troubleshooting procedure Code Category Content of Abnormality Leading Cause Driver IC Error Signal Detection (Protection for Overcurrent, Activation of Fan Controller Protection Voltage Decrease, Short Circuit), Instantaneous Overcurrent Abnormality of Fan Controller Fin Fin Thermistor Failure, Heat Exchanger Clogging, Fan Temperature Motor Failure Fan Controller...

  • Page 265: Troubleshooting By Alarm Code

    10 Troubleshooting Troubleshooting procedure 10.2.2.2 Troubleshooting by alarm code Alarm code Activation of the Indoor unit protection device (float switch) in indoor unit • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. Example of 4-way Cassette Type This alarm code is displayed when the contact between #1 and #2 of CN14 on the I.U. PCB is opened for more than 120 seconds during the cooling, dry, fan, or heating operation.
  • Page 266 10 Troubleshooting Troubleshooting procedure Activation of Protection Device (High Pressure Switch) in Outdoor Unit or Compressor thermostat Alarm code activation (High Temperature Cut) • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. Action (Turn OFF Cause Check Item Phenomenon...
  • Page 267 10 Troubleshooting Troubleshooting procedure Alarm code Abnormal Communication between Indoor Units and Outdoor Units • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. When fuses are blown, or the circuit breakers are activated, check the cause of overcurrent and take necessary action. This alarm code is displayed when an abnormal condition continues for three minutes after normal communication between indoor units and outdoor units, and also the abnormal condition continues for 30 seconds even after the micro- computer is automatically reset.
  • Page 268 10 Troubleshooting Troubleshooting procedure Alarm code Abnormal Communication between Inverter PCB and the Outdoor Unit PCB • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed after the operation is stopped when an abnormal communication occurs between the inverter PCB (Driver Board) and the outdoor unit PCB (Main Board).
  • Page 269 10 Troubleshooting Troubleshooting procedure Alarm code Abnormal Inverter voltage (Insufficient inverter voltage or over voltage) • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. If either insufficient voltage or overvoltage is detected between the terminal R-S on the inverter PCB (Driver Board) three times in 30 minutes, the operation stops and this alarm code is displayed. If this occurs less than three times in 30 minutes, the operation is automatically retried.
  • Page 270 10 Troubleshooting Troubleshooting procedure Alarm code Decrease in Discharge Gas Superheat • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. If either insufficient voltage or overvoltage is detected between the terminal R-S on the inverter PCB (Driver Board) three times in 30 minutes, the operation stops and this alarm code is displayed. If this occurs less than three times in 30 minutes, the operation is automatically retried.
  • Page 271 10 Troubleshooting Troubleshooting procedure Alarm code Excessively High Discharge Gas Temperature • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when the discharge temperature is too high during cooling/heating operation. Is thermistor THM9 Failure of Thermistor normal?
  • Page 272 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of Thermistor for Indoor Unit Inlet Air Temperatures (Inlet Air Thermistor) • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when a short circuit (0.24kΩ or less) or disconnection (840kΩ or more) of the thermistor is detected during a heating or cooling operation. The operation automatically restarts when the malfunction is removed. Is thermistor THM1 (for inlet Connect them air temperature) connected to...
  • Page 273 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of Thermistor for Indoor Unit Outlet Air Temperatures (Outlet Air Thermistor) • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when a short circuit (0.24kΩ or less) or disconnection (840kΩ or more) of the thermistor is detected during a heating or cooling operation. The operation automatically restarts when the malfunction is removed. Is thermistor THM2 (for outlet Connect them air temp.) connected to THM2...
  • Page 274 10 Troubleshooting Troubleshooting procedure Abnormality of Thermistor for Liquid Refrigerant Pipe Temperature at Indoor Unit Heat Exchanger Alarm code (Freeze Protection Thermistor) • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when a short circuit (0.24kΩ or less) or disconnection (840kΩ or more) of the thermistor is detected during a heating or cooling operation. The operation automatically restarts when the malfunction is removed. Is thermistor THM3 (for freeze Connect them protection) connected to...
  • Page 275 10 Troubleshooting Troubleshooting procedure Abnormality of Thermistor for Gas Refrigerant Pipe Temperature at Indoor Unit Heat Exchanger (Gas Alarm code Pipe Thermistor) • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when a short circuit (0.24kΩ or less) or disconnection (840kΩ or more) of the thermistor is detected during a heating or cooling operation. The operation automatically restarts when the malfunction is removed. Is thermistor THM5 (for gas Connect them pipe) connected to THM5 of...
  • Page 276 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of Thermistor for Outside Air Temperature (for Econofresh) • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when a short circuit (0.24kΩ or less) or disconnection (840kΩ or more) of the thermistor is detected during a heating or cooling operation. The operation automatically restarts when the malfunction is removed. Is resistance of THM4 (for Failure of Thermistor Outside Air Temperature)
  • Page 277 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of Discharge Gas Thermistor • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when a short circuit (0.9kΩ or less) or disconnection (5946kΩ or more) of the thermistor is detected during a heating or cooling operation. Is thermistor connected to THM9 Connect it of Outdoor Unit PCB? Is resistance of THM9 within...
  • Page 278 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of High Pressure Sensor • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when output voltage of the high pressure sensor decreases to 0.1V or less, or increases to 4.9V or more during operation.
  • Page 279 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of Outdoor Air Thermistor (Outdoor Unit Ambient Thermistor) • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when a short circuit (0.2kΩ or less) or disconnection (500kΩ or more) of the thermistor is detected during heating or cooling operation. Is thermistor THM7 connected to THM7 of Connect them Outdoor Unit PCB?
  • Page 280 10 Troubleshooting Troubleshooting procedure Abnormality of Thermistor for Evaporating Temperature during Heating Operation (Outdoor Unit Alarm code Evaporating Thermistor) • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when a short circuit (0.2kΩ or less) or disconnection (500kΩ or more) of the thermistor is detected during heating or cooling operation. Is thermistor connected to THM8 of Outdoor Unit Connect it...
  • Page 281 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of Low Pressure Sensor • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when output voltage of the high pressure sensor decreases to 0.1V or less, or increases to 4.9V or more during operation.
  • Page 282 10 Troubleshooting Troubleshooting procedure Alarm code Incorrect Capacity Setting of Outdoor Unit and Indoor Unit • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when an undefined setting is set to DSW3 (for capacity and power supply setting) on the service board or O.U.PCB (4~6HP). This alarm code is displayed when the total indoor unit capacity is outside the range of connectable indoor unit capacity ratio.
  • Page 283 10 Troubleshooting Troubleshooting procedure Alarm code Incorrect Setting of Indoor Unit Number • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed in 3 to 5 minutes after power-on of outdoor unit, when the indoor unit No. set by DSW6 and RSW1 on I.U.
  • Page 284 10 Troubleshooting Troubleshooting procedure Alarm code Problem with Picking Up Circuit for Protection in Outdoor Unit • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. This alarm code is displayed when the outdoor unit PCB detects that the protection device (PSH) is activated. Is DC12V applied to the terminals during Failure of driver board...
  • Page 285 10 Troubleshooting Troubleshooting procedure Alarm code Activation of Pressure Ratio Decrease Protection • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. If the pressure ratio ɛ is less than 1.5 for a minute, the compressor stops. It automatically restarts after three minutes. If this occurs again twice in the next 30 minutes, this alarm code is displayed.
  • Page 286 10 Troubleshooting Troubleshooting procedure Alarm code Activation of Low Pressure Increase Protection • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. If the pressure (Ps) of the compressor is more than 1.4 MPa for a minute, the compressor stops. The operation automatically restarts after three minutes.
  • Page 287 10 Troubleshooting Troubleshooting procedure Alarm code Activation of High Pressure Increase Protection • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. If the high pressure (Pd) of the compressor is more than 3.8 MPa for a minute, the compressor stops. The operation automatically restarts after three minutes.
  • Page 288 10 Troubleshooting Troubleshooting procedure Alarm code Activation of Low Pressure Decrease Protection • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. If the low pressure (Ps) of the compressor is less than 0.09 MPa for 12 minutes, the compressor stops. The operation automatically restarts after three minutes.
  • Page 289 10 Troubleshooting Troubleshooting procedure Alarm code Activation of Inverter Overcurrent Protection • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. If instantaneous overcurrent or electronic thermal protection occurs on inverter as follows, the compressor stops. The operation automatically restarts after three minutes. If this occurs again five times in the next 30 minutes, this alarm code is displayed.
  • Page 290 10 Troubleshooting Troubleshooting procedure Restart Operation Driver board is damaged, replace Check if compressor wirings are connected Does alarm code display the driver board reversely? immediately after compressor Is electric reactor wiring secure? started operation? Replace compressor, if faulty Fasten the wiring Is electric reactor wiring loose? Is the power supply voltage within the range of the rated voltage?
  • Page 291 10 Troubleshooting Troubleshooting procedure Alarm code Shortage of energy transfer at IDU and ODU side • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. If any of the following operating conditions occur during compressor operation, the compressor will stop and retry after 3 minutes.
  • Page 292 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of Current Sensor for Inverter • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. If abnormal current detection occurs, the compressor stops. The operation automatically restarts after three minutes. If this occurs again twice in the next 30 minutes, this alarm code is displayed.
  • Page 293 10 Troubleshooting Troubleshooting procedure Alarm code Inverter Error Signal Detection • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. If IPM (transistor module) error, ground fault detection or step-out detection occurs, the compressor stops. The operation automatically restarts after three minutes.
  • Page 294 10 Troubleshooting Troubleshooting procedure Restart Operation Does alarm code Check if compressor wirings are Driver board is damaged, display immediately replace the driver board connected reversely? after compressor started Is electric reactor wiring secure? operation? Replace compressor, if faulty Is electric reactor wiring loose? Fasten the wiring Is the power supply voltage within the range of the rated voltage?
  • Page 295 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of Inverter Fin Temperature • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. When the following condition occurs three times in 30 minutes, the operation stops and this alarm code is displayed. If this occurs less than three times in 30 minutes, the operation automatically restarts.
  • Page 296 10 Troubleshooting Troubleshooting procedure Alarm code Inverter Failure • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. When the following condition occurs three times in 30 minutes, the operation stops and this alarm code is displayed. If this occurs less than three times in 30 minutes, the operation automatically restarts.
  • Page 297 10 Troubleshooting Troubleshooting procedure Alarm code Abnormality of Fan Motor • The alarm code is flashed on the 7-segment display of the outdoor unit. • The alarm code is displayed on the wired controller of the indoor unit. If the revolution of the fan motor is less than 10rpm in 10 seconds after the fan motor starts operation, the fan motor stops.

  • Page 298: Troubleshooting In Check Mode

    10 Troubleshooting Troubleshooting in check mode 10.3 Troubleshooting in check mode 10.3.1 RAS-3HVRC2 10.3.1.1 Check mode display by Unit controller 10.3.1.2 Troubleshooting using the 7 segment display (Outdoor unit)  Simple checking by 7-segment display During auto-addressing, the following items can be checked using the Turn ON indoor unit connected to outdoor unit’s on-board 7-segment LED display: the outdoor unit...
  • Page 299 10 Troubleshooting Troubleshooting in check mode Item Indication data Item Check Indic. Indic. Contents number Input/output state of outdoor Indicates only for the segments corresponding to the equipment in micro-computer the figure. (See figure above) 00~199 Capacity of operating indoor unit In case that capacity is higher than 100, the last two digits flash Control Software No. in use is indicated. Alternately upper 2 digits Control software number 12↔34.
  • Page 300 10 Troubleshooting Troubleshooting in check mode  Cause of indoor unit stoppage ( Indication Contents Operation OFF, Power OFF Thermo-OFF Alarm Freeze protection overheating protection Instantaneous power failure at outdoor unit Instantaneous power failure at indoor unit Stoppage of Cooling Operation due to Low Outdoor Air Temperature Stoppage of Heating Operation due to High Outdoor Air Temperature Demand Retry due to compression ratio decrease...
  • Page 301 10 Troubleshooting Troubleshooting in check mode  i Cause of inverter stoppage ( Remark Cause of stoppage Code Cause for corresponding Indication Alarm Code unit during retry Automatic Stoppage of Transistor Module (DIP-IPM Error) (Overcurrent, Undercurrent, Temperature increase) Instantaneous Over Current Abnormal Inverter Fin Thermistor Electronic Thermal Activation (Inverter overcurrent) Inverter Voltage Decrease (Undervoltage)
  • Page 302 10 Troubleshooting Troubleshooting in check mode  Protection control code on 7-segment display 1 Protection control code is displayed on 7-segment when a protection control is activated. 2 Protection control code is displayed while function is working, and goes out when released. 3 When several protection control are activated, code number with higher priority will be indicated (see below for the priority order).

  • Page 303: Ras-(4-6)H(V)(R/N)(C/P)2E

    10 Troubleshooting Troubleshooting in check mode  Activating condition of protection control code To monitor the conditions such as the temperature change and others, the control of the frequency and other controls are performed by the protection control in order to prevent the abnormal operations. The activating conditions of protection control are shown in the table below: Code Protection Control...
  • Page 304 10 Troubleshooting Troubleshooting in check mode  Location of the pushswitches and the 7-segment display The push-switches and the 7-segment display are located on PCB2 (RAS-(4-6)HV(R/N)(C/P)2E) and PCB1 (RAS-(4-6) H(R/N)(C/P)2E). 7-Segment Display 7-segment Display (RVR) Y20F (SVF) FAN2  Protection control code on the 7-segment display • A protection control code is displayed on the 7-segment display during the operation when the protection control has been activated.
  • Page 305 10 Troubleshooting Troubleshooting in check mode  Activation condition of the protection retry control code The protection control or the retry control is carried out to prevent abnormal operation. The activation conditions are listed in the following table. Code Protection control Activation conditions Notes Pressure ratio protection control...
  • Page 306 10 Troubleshooting Troubleshooting in check mode When activating three times in thirty Insufficient voltage in the Inverter circuit minutes, alarm code "06" is indicated. Inverter voltage anomaly retry When activating three times in thirty Excessive voltage in the Inverter circuit minutes, alarm code "06" is indicated. The actual Inverter frequency is 0 Hz more than 3 When activating three times in thirty Inverter failure retry...
  • Page 307 10 Troubleshooting Troubleshooting in check mode  Information for the outdoor unit Press PSW2 (▼) for forward of PSW3 (▲) to backward. The information will be alternately indicated as “Item” “Details” 7-Segment Display Item Details Output State of Outdoor Micro-Computer Indication Refer to Output State of Outdoor Micro-Computer “Arrangement of Push Switches and 7-Segment Display Total Capacity of Operated Indoor Units. Total Capacity of Operated Indoor Unit Refer to “Indoor Unit Capacity Table”...
  • Page 308 10 Troubleshooting Troubleshooting in check mode  Capacity table for the outdoor units Indication Capacity (kW) Horsepower (HP) 12.1 14.0 15.5  Capacity table for the indoor units Capacity Horsepower Capacity Horsepower Indication Indication (kW) (HP) ( kW) (HP) 11.2 14.0 16.0 ...
  • Page 309 10 Troubleshooting Troubleshooting in check mode  Cause of inverter stoppage (check the item) Code Cause Code Cause Abnormal compressor motor (Step-out) Driver IC Error Signal Detection Abnormal combination of PCB Instantaneous Overcurrent EPROM error Inverter fin temperature increase Abnormal compressor frequency Electronic Thermal Protection (Inverter Overcurrent) Beyond frequency scope Inverter voltage decrease...

  • Page 310: Checking Procedure For Main Parts

    10 Troubleshooting Checking procedure for main parts 10.4 Checking procedure for main parts 10.4.1 RAS-3HVRC2 10.4.1.1 Checking procedure for the PCB Turn ON outdoor unit  LED 4 is ON? Fuse PF1 / PF4 /EFR1 are Failure of AC Power Circuit of blowout OU PCB or fan motor Connect PCN406.

  • Page 311: Checking Procedeure For The Dc Fan Motor

    10 Troubleshooting Checking procedure for main parts Check Point Normal Range (V) (+) Side of Tester (-) Side of Tester Approx. 311VDC VDC-2 VCC15-1 13.5VDC ~ 16.5VDC VCC05 4.5VDC ~ 5.5VDC GND1 VCC12 11.9VDC ~14.3VDC C A U T I O N •...

  • Page 312: Checking Procedure For The Electronic Expansion Valve For Indoor And Outdoor Units

    10 Troubleshooting Checking procedure for main parts 10.4.1.3 Checking procedure for the electronic expansion valve for indoor and outdoor units Indoor unit electronic expansion valve Outdoor unit electronic expansion valve Check the liquid pipe temperature during the heating It is abnormal if the liquid pipe pressure does Locked with fully closed process.

  • Page 313: Checking Procedure For Other Parts

    10 Troubleshooting Checking procedure for main parts 10.4.1.4 Checking procedure for other parts Resistance (Ω) Part name Model code Resistance (Ω) 1473 VHV-01AP552B1 (at 20ºC) Reversing Valve Coil STF-G01AG579A1 (at 75ºC) (4-way solenoid valve) 1800 STF-H01AI1870A1 (at 20ºC) 1.138 EU1114D9 (at 75ºC) 1.138 EU140XA2...
  • Page 314 10 Troubleshooting Checking procedure for main parts Bistable solenoid operation type (pulse-activated) Operation Mode: Cooling → Heating Operation Mode: Cooling → Heating Reversing Valve: OFF → ON Reversing Valve: OFF → ON When current is applied to the reversing valve coil, an When current is applied to the reversing valve coil, an electromagnetic force headed in the same direction as the electromagnetic force headed in the direction opposite to the...

  • Page 315: Checking Procedure For The Inverter Pcb

    10 Troubleshooting Checking procedure for main parts 10.4.1.5 Checking procedure for the inverter PCB  Fault diagnosis of DC fan motor When Alarm 04 or 53 is indicated and some PCB is faulty, it may have been caused due to faulty fan motor. If PCB operates with a faulty fan motor, it can be damaged.

  • Page 316: Checking Procedure For The Compressor

    10 Troubleshooting Checking procedure for main parts 10.4.1.6 Checking procedure for the compressor  Check list on compressor Check list on compressor Client:___________________________ Model: __________________________ Date: ______________________ Serial Nº: _______________________ Production date: __________________ Checker: ___________________ Check item Check method Result Remarks 1.
  • Page 317 10 Troubleshooting Checking procedure for main parts  Additional Information for “Check list on compressor” Check item Additional information (mechanism of the compressor failure) The liquid refrigerant return volume to the compressor is controlled by the discharge gas temperature Td when compressor is operating.

  • Page 318: Rsw, Dsws And Leds Functions Ras-(4-6)Hv(R/N)(C/P)2E

    10 Troubleshooting Checking procedure for main parts 10.4.2 RSW, DSWs and LEDs functions RAS-(4-6)HV(R/N)(C/P)2E 10.4.2.1 Location of print circuit boards (PCBs) PCB3 PCB1 PCB2 10.4.2.2 Purpose Symbol Purpose 1. Transmission between the indoor and outdoor units. 2. Processing for sensor input. 3.
  • Page 319 10 Troubleshooting Checking procedure for main parts Printed circuit board for control: PCB1 LED5 LED10 LED1 LED7 LED9 LED4 LED3 LED2 LED11 LED6 LED8 Part name Contents of functions Power source indicator for main control of the PCB1 (5V). LED1 (Red) Normal condition: Activated / ON.
  • Page 320 10 Troubleshooting Checking procedure for main parts Inverter printed circuit board for control: PCB2 DSW3 DSW2 SEG1 DSW6 DSW4 PSW3 DSW1 PSW2 PSW1 RSW1 DSW7 DIP Switch Code Definition DIP Switch Code Definition DSW1 Test Run PSW1 Manual Defrosting (▼) DSW2 Function Setting PSW2...

  • Page 321: Rsw, Dsws And Leds Functions Ras-(4-6)H(R/N)(C/P)2E

    10 Troubleshooting Checking procedure for main parts 10.4.3 RSW, DSWs and LEDs functions RAS-(4-6)H(R/N)(C/P)2E 10.4.3.1 Location of print circuit boards (PCBs) PCB1 PCB2(INV) PCB3 10.4.3.2 Purpose Symbol Purpose 1. Transmission between the indoor and outdoor units. 2. Processing for sensor input. 3.
  • Page 322 10 Troubleshooting Checking procedure for main parts Printed circuit board for control: PCB1 SEG1 LED6 LED2 LED3 LED1 LED4 Part name Contents of functions Power source indicator for main board (Low Voltage). LED1 (Red) Normal condition: Activated / ON. Abnormal condition: Deactivated / OFF. It indicates the communication state between the Main Board and Driven Board.
  • Page 323 10 Troubleshooting Checking procedure for main parts Inverter printed circuit board for control: PCB2 DSW1 LED7 LED6 LED2 LED3 LED4 LED5 LED1 Part name Contents of functions Communication Indicator. LED1 (Green) Normal condition: Flashing. Abnormal condition: ON / OFF. Power Source Indicator for Driver Board LED7 (Red) Normal condition: Activated / ON.
  • Page 324 10 Troubleshooting Checking procedure for main parts Printed Circuit Board for Fan Control: PCB3 LED1 Part name Contents of functions PCB1 power indication LED1 (Red) Normal condition: Activated / ON. Abnormal condition: Deactivated / OFF. SMGB0136 rev.0 - 07/2021...

  • Page 325: Maintenance Notes

    11 Maintenance notes 11 . M a i n t e n a n c e n o t e s Index 11.1 General notes ............................326 11.1.1 Checking the power source and the wiring connection ................326 11.1.3  Insufficient cooling performance when a long piping is applied ..............326 11.1.4 ...

  • Page 326: General Notes

    11 Maintenance notes General notes 11.1 General notes 11.1.1 Checking the power source and the wiring connection Check the following items in the case of abnormal operation: Check item Procedure Is the breaker of the fuse cut out? Check the secondary voltage of the breaker and the fuse by means of a tester. Check the wiring connection on the PCB. •  Thermistor connectors Is the wiring loosened or •  Connector of the Unit controller cable incorrectly connected? • ...

  • Page 327: Abnormally High Operation Sound (In The Ceiling Type Indoor Unit)

    11 Maintenance notes General notes 11.1.4 Abnormally high operation sound (in the ceiling type indoor unit) Question and answer for the field work Example 3: Abnormally high operation sound (in-the-ceiling type indoor unit) Phenomenon The operation sound at the “HIGH” speed was abnormally high. The indoor units were installed without the ducts. Since there was any external static pressure a big air  volume was supplied. This resulted in a higher air speed through the heat exchanger. Damper Indoor unit Air filter Cause Countermeasure In order to reduce the airflow set the indoor unit at “Low static pressure” setting. 11.1.5 Alarm code “31” Question and answer for the field work Example 4: Alarm code “31”...

  • Page 328: Maintenance Work

    11 Maintenance notes Maintenance work 11.2 Maintenance work C A U T I O N • All inspections and checks of the outdoor unit and indoor unit have to be carried out by a licensed technician and never by the user itself.

  • Page 329: Service And Maintenance Record

    11 Maintenance notes Service and maintenance record 11.3 Service and maintenance record Check item Action Judgement Is the service area sufficient? — Is there a short circuit of the discharged air? — Any heat influence? — Is the earth wire connected? — Refrigerant piping. — Good Not Good Fixing the units. —...

  • Page 330: Service And Maintenance Record Using The 7-Segment Display

    11 Maintenance notes Service and maintenance record using the 7-segment display 11.4 Service and maintenance record using the 7-segment display  RAS-3HVRC2 Customer’s name: Date: Outdoor unit model (serial No. ) RAS- 1. Operation mode 2. Test run start time 3. Data collect start time 4. Read out data from 7-segment in outdoor unit 4.1 Protection control code 4.2 Total capacity of connected IU *...
  • Page 331 11 Maintenance notes Service and maintenance record using the 7-segment display  RAS-(4-6)(V)(R/N)(C/P)2E Customer’s name: ______________________________ Date: _______________________ Outdoor unit model RAS- RAS- (Serial number: _________________) (Serial number: ______________) (Serial number: ______________) 1. Operation mode 2. Test Run Start Time 3. Data Collect Start Time 4. Read Out Data from 7-Segment in Outdoor Unit 5. Protection Control Code (RVR) Y20F (SVF) Y20A Y52C Y20A Y52C (SVA) (RVR) (CMC) (CH) (SVA) (RVR)

  • Page 332: Information Of Indoor Unit

    11 Maintenance notes Service and maintenance record using the 7-segment display 11.4.1 Information of Indoor unit RAS- RAS- Indoor unit model (Serial number: _____________) (Serial number: _________________) 1. Test Run Start Time 2. Data Collect Start Time Indoor Unit Capacity Indoor Expansion Valve Opening Liquid Pipe Temperature of Indoor Unit Gas Pipe Temperature of Indoor Unit Indoor Unit Inlet Air Temperature Indoor Unit Outlet Air Temperature Cause Code of Indoor Unit Stoppage 11.4.2 Information of cause code of alarm 1. Test Run Start Time 2. Data Collect Start Time Alarm Cause Code...

  • Page 333: Service And Maintenance Table Through The Remote Control Switch

    11 Maintenance notes Service and maintenance table through the remote control switch 11.5 Service and maintenance table through the remote control switch 11.5.1 RAS-3HVRC2 Data sheet for the checks using the remote control switch:  Time IU model IU serial number IU number / Alarm code Check Check 1 · 2 1 · 2 1 · 2 1 · 2 1 ·...
  • Page 334 11 Maintenance notes Service and maintenance table through the remote control switch F Automatic louver state Louver sensor state H Pressure and frequency state indication Discharge pressure Suction pressure Control information Operating frequency J Indication of the IU capacity IU capacity (x 1/8 HP) OU code Refrigerant cycle number Refrigerant cycle number L Expansion valve opening IU expansion valve...

  • Page 335: Ras-(4-6)(V)(R/N)(C/P)2E

    11 Maintenance notes Service and maintenance table through the remote control switch 11.5.2 RAS-(4-6)(V)(R/N)(C/P)2E Data sheet for checking by remote control switch Time IU model IU serial number IU number / alarm code Check mode 1 Check  mode 2 1·2 1·2 1·2 1·2 1·2 B Temperature indication Set temperature Inlet air temperature Discharge air temperature Liquid pipe temperature Remote thermistor temperature Outdoor air temperature Gas pipe temperature Evaporating temperature at heating Condensing temperature at cooling Compressor top temperature Thermo temperature of remote  control switch Not prepared C Micro-computer state indication IU micro-computer...

  • Page 336: Refrigerant Collection Method

    11 Maintenance notes Refrigerant collection method 11.6 Refrigerant collection method 11.6.1 Refrigerant collection method when replacing the parts of outdoor unit Process Procedure Remarks Turn OFF the main switch of the outdoor unit. Make sure that the terminal part of the detached power  Remove the covers, the thermistor, the crankcase heater, the  supply wires is not exposed by the winding insulation  power wirings, and other items. tape and other items. Attach the manifold to the check joint of the high pressure side  and the low pressure side of the outdoor unit. Turn ON the main switch of the outdoor unit. In case that compressor operates Perform pre-refrigerant collection during cooling test run.
  • Page 337 11 Maintenance notes Refrigerant collection method Process Procedure Remarks Collect the refrigerant by means of the refrigerant collection: •  The discharge of the refrigerant in the atmosphere  Perform either A or B depending on the process 7. is strictly forbidden. Make sure that the refrigerant is  A. The leak rate at the process 7 is within the specification  collected by a refrigerant collector. →Collect the refrigerant only at the low-pressure side. B. The leak rate at the process 9 is greater than the  •  Measure the quantity of the collected refrigerant and  specification → Collect all the refrigerant of the outdoor unit  record it. side by means of the machine. After collecting the refrigerant, remove the charge hose at  Make sure that there is no pressure increase of the low the collector side of the low pressure side, so that the low  pressure side of the refrigerant cycle will be the atmosphere  pressure sides after collecting the refrigerant. pressure.

  • Page 338: Refrigerant Collection Method When Replacing Indoor Unit

    11 Maintenance notes Refrigerant collection method 11.6.2 Refrigerant collection method when replacing indoor unit Process Procedure Remarks Turn OFF the main switch of OU and I.U. Close all the gas stop valves (at low and high  pressure side) of OU and the liquid and gas stop valve  completely. •  The discharge of the refrigerant in the atmosphere  Collect the refrigerant by a refrigerant collector. Activate  is strictly forbidden. Make sure that the refrigerant is  forced open valve mode. Collect the refrigerant from the  collected by a refrigerant collector. gas stop valves (at low and high pressure sides) of OU  and the check joint of the liquid stop valve. Collect all  •  Measure the quantity of the collected refrigerant and  the refrigerant in the IU side by refrigerant collector. record it. •  Make sure that there is no pressure increase after collecting the refrigerant and then remove the charge ...

This manual is also suitable for:

Utopia ras-5hvrp2eUtopia ras-6hvrp2eUtopia ras-4hrp2eUtopia ras-5hrp2eUtopia ras-6hrp2eUtopia ras-4hvnp2e ... Show all

Table of Contents