Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model names]
PKFY-P24NKMU-E
PKFY-P30NKMU-E
[Service Ref.]
PKFY-P24NKMU-E.TH
PKFY-P30NKMU-E.TH
R410A
R22
CONTENTS
1. PART NAMES AND FUNCTIONS .......... 2
2. SPECIFICATION ..................................... 4
3. OUTLINES AND DIMENSIONS .............. 6
4. WIRING DIAGRAM ................................. 7
5. REFRIGERANT SYSTEM DIAGRAM .......... 8
6. MICROPROCESSOR CONTROL ........... 9
7. TROUBLESHOOTING .......................... 14
8. DISASSEMBLY PROCEDURE ............. 21
PARTS CATALOG (OCB462)
May 2011
No. OCH462
REVISED EDITION-A
Revision:
• 3. OUTLINES AND
DIMENSIONS has been modi-
fied in REVISED EDITION-A.
• Some descriptions have been
modified.
• Please void OCH462.
Note:
• This manual describes only
service data of the indoor
units.
• RoHS compliant products
have <G> mark on the spec
name plate.
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Related Manuals for Mitsubishi Electric CITY MULTI PKFY-P24NKMU-E
Summary of Contents for Mitsubishi Electric CITY MULTI PKFY-P24NKMU-E
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Page 1: Table Of Contents
REVISED EDITION-A TECHNICAL & SERVICE MANUAL R410A Indoor unit Revision: [Model names] [Service Ref.] • 3. OUTLINES AND DIMENSIONS has been modi- PKFY-P24NKMU-E.TH fied in REVISED EDITION-A. PKFY-P24NKMU-E • Some descriptions have been modified. PKFY-P30NKMU-E.TH PKFY-P30NKMU-E • Please void OCH462. Note: •... -
Page 2: Part Names And Functions
Use the specifi ed refrigerant only. Never use any refrigerant other than that specifi ed. Doing so may cause a burst, an explosion, or fi re when the unit is being used, serviced, or disposed of. Correct refrigerant is specifi ed in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. -
Page 3: Wired Remote Controller
Wired remote controller Display Section “Sensor” indication Day-of-Week Displays when the remote controller Shows the current day of the week. sensor is used. For purposes of this explanation, Time/Timer Display all parts of the display are shown. Shows the current time, unless the simple or Auto Off During actual operation, only “Locked”... -
Page 4: Specification
SPECIFICATION 2-1. Specifi cations PKFY-P30NKMU-E PKFY-P24NKMU-E Model Power source 1-phase 208-230V 60Hz Cooling capacity (Nominal) Btu/h 24,000 30,000 0.04 Power input 0.06 0.29 0.43 Current input Heating capacity 10.0 (Nominal ) Btu/h 27,000 34,000 0.04 0.06 Power input 0.29 0.43... -
Page 5: Sound Levels
2-2. Electrical parts specifi cations Service Ref. Symbol PKFY-P24NKMU-E.TH PKFY-P30NKMU-E.TH Parts name Room temperature Resistance 30°F/15.8k , 50°F/9.6k , 70°F/6.0k , 80°F/4.8k , 90°F/3.9k , 100°F/3.2k TH21 thermistor Liquid pipe thermistor Resistance 30°F/15.8k , 50°F/9.6k , 70°F/6.0k , 80°F/4.8k , 90°F/3.9k , 100°F/3.2k... -
Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS PKFY-P24NKMU-E.TH Unit : inch (mm) Top side 16-11/16(423.7) 17(431.7) PKFY-P30NKMU-E.TH Left side Right side Front side Mount board Knockout hole for left piping 9-1/2(241) 2-29/32(74) 33-21/32(855) 3/16(5) 11-5/8(295) 46-1/16(1170) Operation lamp Front side(Grille open) Knockout hole for right piping... -
Page 7: Wiring Diagram
WIRING DIAGRAM PKFY-P24NKMU-E.TH PKFY-P30NKMU-E.TH SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD ROOM TEMP. DETECTION TH21 THERMISTOR CN24 CONNECTOR (32°F/15kΩ, 77°F/5.4kΩ) EXTERNAL HEATER PIPE TEMP. DETECTION/LIQUID CN32 REMOTE SWITCH TH22 (32°F/15kΩ, 77°F/5.4kΩ) CN51 CENTRALLY CONTROL CN52 REMOTE INDICATION PIPE TEMP. DETECTION/GAS1... -
Page 8: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PKFY-P24NKMU-E.TH PKFY-P30NKMU-E.TH Gas pipe thermistor (1) TH23 Strainer (#50mesh) Gas pipe Gas pipe thermistor (2) TH24 Flare connection Liquid pipe thermistor TH22 Heat exchanger Liquid pipe Linear expansion valve Room temparature thermistor TH21 Strainer1 (#50mesh) Strainer2 (#100mesh) -
Page 9: Microprocessor Control
MICROPROCESSOR CONTROL INDOOR UNIT CONTROL 6-1. COOL OPERATION <How to operate> Press POWER ON/OFF button. TIME SUN MON TUE WED THU FRI SAT TIMER Press the operation MODE button to display COOL. AFTER AFTER ERROR CODE FUNCTION û Fû C FILTER û... -
Page 10: Dry Operation
6-2. DRY OPERATION <How to operate> Press POWER ON/OFF button. TIME SUN MON TUE WED THU FRI SAT TIMER AFTER AFTER Press the operation MODE button to display DRY. ERROR CODE FUNCTION û Fû C FILTER û Fû C Press the TEMP. button to set the desired temperature. WEEKLY SIMPLE ONLY1Hr. -
Page 11: Fan Operation
6-3. FAN OPERATION <How to operate> Press POWER ON/OFF button. TIME SUN MON TUE WED THU FRI SAT Press the operation MODE button to display FAN. TIMER AFTER AFTER ERROR CODE FUNCTION û Fû C FILTER û Fû C WEEKLY SIMPLE ONLY1Hr. -
Page 12: Heat Operation
6-4. HEAT OPERATION <How to operate> Press POWER ON/OFF button. Press the operation MODE button to display HEAT. TIME SUN MON TUE WED THU FRI SAT Press the TEMP. button to set the desired temperature. TIMER AFTER AFTER ERROR CODE FUNCTION NOTE: The set temperature changes 2°F when the button is... - Page 13 From the preceding page Control modes Control details Remarks 2-3. Thermo OFF mode 2. Fan When the thermoregulating function changes to OFF, the indoor fan operates in [Extra low]. 2-4. Heat defrosting mode The indoor fan stops. (1) Initial setting: OFF → HEAT···[last setting] 3.
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Page 14: Troubleshooting
TROUBLESHOOTING 7-1. HOW TO CHECK THE PARTS PKFY-P24NKMU-E.TH PKFY-P30NKMU-E.TH Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH21) (At the ambient temperature 50°F~86°F) Liquid pipe temperature Normal Abnormal thermistor (TH22) Refer to 7-1-1. - Page 15 <Output pulse signal and the valve operation> Closing a valve : 1 → 2 → 3 → 4 → 1 Output Output Opening a valve : 4 → 3 → 2 → 1 → 4 (Phase) The output pulse shifts in above order. Note: •...
- Page 16 7-1-3. DC Fan motor (fan motor/indoor controller circuit board) Check method of DC fan motor (fan motor/indoor controller circuit board) Notes · High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNMF) for the motor with the power supply on. board and fan motor.) (It causes trouble of the indoor controller circuit Self check...
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Page 17: Function Of Dip Switch
7-2. Function of Dip switch PKFY-P24NKMU-E.TH PKFY-P30NKMU-E.TH Operation by switch Effective Switch Pole Function Remarks timing Thermistor<Room temperature> Built-in remote controller Indoor unit Address board position Filter clogging detection Provide Not provide <Initial setting> Filter cleaning sign 2,500 hr 100 hr... - Page 18 Effective Operation by switch Remarks Switch timing SW11 Address board SW12 SW11 How to set addresses 1s digit Example : If address is "3", remain SW12 address <Initial setting> (for over 10) at "0", and match SW11 (for 1 to 9) setting SW12 SW11...
- Page 19 7-3. TEST POINT DIAGRAM 7-3-1. Indoor controller board CNMF PKFY-P24NKMU-E.TH Connect to the fan motor (MF) PKFY-P30NKMU-E.TH 1-3 : DC294~325V 4-3 : DC15V FUSE 5-3 : DC0~6V 3.15A 250V 6-3 : DC0 or DC15V (Stop) DC7.5V (Operation) (12VDC pluse) Power supply for...
- Page 20 7-3-2. Wireless remote controller board PKFY-P24NKMU-E.TH PKFY-P30NKMU-E.TH LD101 Connect to the indoor controller board (I.B) 7-3-3. Address board PKFY-P24NKMU-E.TH PKFY-P30NKMU-E.TH Function setting SW12 SW11 SW14 Address setting Address setting Branch No. 10ths DIGIT 1s DIGIT...
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Page 21: Disassembly Procedure
DISASSEMBLY PROCEDURE PKFY-P24NKMU-E.TH PKFY-P30NKMU-E.TH Be careful when removing heavy parts. OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS 1. REMOVING THE PANEL Photo 1 Front grille Screws (1) Press and unlock the knobs on both sides of the front grille and lift the front grille until it is level. Pull the hinges forward to remove the front grille. -
Page 22: Operation Procedure
OPERATION PROCEDURE PHOTOS 3. REMOVING THE ELECTRICAL BOX Photo 4 Connect for ground Fixture (1) Remove the panel and the corner box. (Refer to 1.) (2) Remove the screw and hook of address board case. (3) Remove the front and side electrical box covers (each 1 screw). - Page 23 OPERATION PROCEDURE PHOTOS 6. REMOVING THE INDOOR FAN MOTOR AND THE Photo 7 LINE FLOW FAN Screw of the motor band (1) Remove the panel and the corner box. (Refer to 1.) Lead wire of pipe thermistor (2) Remove the electrical box (Refer to 2.) and the nozzle assembly (Refer to 3.).
- Page 24 Room temp. thermistor (TH21) HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU TOKYO 100-8310, JAPAN Copyright 2009 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in May 2011 No. OCH462 REVISED EDITION-A Distributed in May 2009 No. OCH462 PDF 6 New publication, effective May 2011...