1. Manuals
  2. Brands
  3. Toshiba Manuals
  4. Air Conditioner
  5. MD-VNK802HEXE
  6. Service manual

Toshiba MD-VNK802HEXE Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

AIR CONDITIONER (MULTI TYPE)

SERVICE MANUAL

Air to Air Heat Exchanger with DX Coil Unit
Model name:
Model with a humidifier
MMD-VNK502HEXE
MMD-VNK802HEXE
MMD-VNK1002HEXE
MMD-VNK1002HEXE2
MMD-VNK502HEXE-TR
MMD-VNK802HEXE-TR
MMD-VNK1002HEXE-TR
This Service Manual describes contents of the Air to Air Heat Exchanger with DX Coil Unit.
For the outdoor unit, refer to the Manual with FILE NO. A10-005, A05-004-1.
FILE No. A10-022-2
Revised Sep. 2011
REVISION 2 : Mar.2012
Re-edit version.( file volume down)
Contents have NOT been changed.
Model without a humidifier
MMD-VN502HEXE
MMD-VN802HEXE
MMD-VN1002HEXE
MMD-VN1002HEXE2
MMD-VN502HEXE-TR
MMD-VN802HEXE-TR
MMD-VN1002HEXE-TR
PRINTED IN JAPAN, Sep, 2011, TDOC

Advertisement

Table of Contents
loading

Related Manuals for Toshiba MD-VNK802HEXE

Summary of Contents for Toshiba MD-VNK802HEXE

  • Page 1: Service Manual

    FILE No. A10-022-2 Revised Sep. 2011 REVISION 2 : Mar.2012 Re-edit version.( file volume down) AIR CONDITIONER (MULTI TYPE) Contents have NOT been changed. SERVICE MANUAL Air to Air Heat Exchanger with DX Coil Unit Model name: Model with a humidifier Model without a humidifier MMD-VNK502HEXE MMD-VN502HEXE...

  • Page 2: Table Of Contents

    Contents Original instruction ........... . 1 Warning indications on the Air to Air Heat Exchanger with DX Coil Unit .

  • Page 3: Original Instruction

    • The qualified installer who is allowed to work at heights has been trained in matters relating to working at heights with the Air to Air Heat Exchanger with DX Coil Unit made by Toshiba Carrier Corporation or, alternatively, he or she has been instructed in such matters by an individual or individuals who have been trained and is thus thoroughly acquainted with the knowledge related to this work.
  • Page 4 Definition of Protective Gear When the Air to Air Heat Exchanger with DX Coil Unit is to be transported, installed, maintained, repaired or removed, wear protective gloves and ‘safety’ work clothing. In addition to such normal protective gear, wear the protective gear described below when undertaking the special work detailed in the table below.

  • Page 5: Warning Indications On The Air To Air Heat Exchanger With Dx Coil Unit

    Warning indications on the Air to Air Heat Exchanger with DX Coil Unit [Confirmation of warning label on the main unit] Confirm that labels are indicated on the specified positions If removing the label during parts replace, stick it as the original. Warning indication Description WARNING...

  • Page 6: Precautions For Safety

    Precautions for safety The manufacturer shall not assume any liability for the damage caused by not observing the description of this manual. WARNING Before starting to repair the Air to Air Heat Exchanger with DX Coil Unit, read carefully through the Service Manual, and repair the Air to Air Heat Exchanger with DX Coil Unit by following its instructions.
  • Page 7 DANGER Before carrying out the installation, maintenance, repair or removal work, be sure to set the circuit breaker for Air to Air Heat Exchanger with DX Coil Unit to the OFF position. Otherwise, electric shocks may result. Before opening the electrical control cover, inspection cover and maintenance cover of the Air to Air Heat Exchanger with DX Coil Unit, set the circuit breaker to the OFF position.
  • Page 8 WARNING After completing the repair or relocation work, check that the earth wires are connected properly. Be sure to connect earth wire. (Grounding work) Incomplete earthing causes an electric shock. Check earth Do not connect earth wires to gas pipes, water pipes, and lightning rods or earth wires for telephone wires. wires.
  • Page 9 The refrigerant used by this Air to Air Heat Exchanger with DX Coil Unit is the R410A. Check the used refrigerant name and use tools and materials of the parts which match with it. For the products which use R410A refrigerant, the refrigerant name is indicated at a position on the outdoor unit where is easy to see.
  • Page 10 Once the repair work has been completed, check for the insulation resistance. Then perform a trial run to check that the Air to Air Heat Exchanger with DX Coil Unit is running properly. After repair work has finished, check there is no trouble. If check is not executed, a fire, electric shock or injury may be caused.
  • Page 11 Only a qualified installer (*1) or qualified service person (*1) is allowed to install the Air to Air Heat Exchanger with DX Coil Unit. If the Air to Air Heat Exchanger with DX Coil Unit is installed by an unqualified individual, a fire, electric shocks, injury, water leakage, noise and / or vibration may result.

  • Page 12: Specifications

    Specifications Model with a humidifier MMD-VNK502HEXE MMD-VNK802HEXE MMD-VNK1002HEXE MMD-VNK1002HEXE2 Function Cooling and heating dual purpose type Type Unit configuration Discrete type 220-240 V~, 50 Hz / 220-240 V~, 50 Hz / Voltage 220-240 V~, 50 Hz 220 V~, 60 Hz 220 V~, 60 Hz 220 V~, 60 Hz Equivalent HP...
  • Page 13 Model with a humidifier MMD-VNK502HEXE-TR MMD-VNK802HEXE-TR MMD-VNK1002HEXE-TR Function Cooling and heating dual purpose type Type Unit configuration Discrete type Voltage 220-240 V~, 50 Hz 220-240 V~, 50 Hz 220-240 V~, 50 Hz Equivalent HP Refrigerant R410A cooling Outdoor air 4.10 (1.30) 6.56 (2.06) 8.25 (2.32) capacity...
  • Page 14 MMD-VN1002HEXE-TR MMD-VN1002HEXE2 Commercial name: TOSHIBA Air to Air Heat Exchanger with DX Coil Unit Complies with the provisions of the “Machinery” Directive (Directive 2006/42/EC) and the regulations transposing into national law. Must not be put into service until the final machinery into which it is to be incorporated has been declared in conformity with the provisions of Machinery Directive.

  • Page 15: Construction Views (External Views)

    Construction views (external views) MMD-VNK502HEXE (-TR), VNK802HEXE (-TR), VNK1002HEXE (-TR), VNK1002HEXE2 MMD-VN502HEXE (-TR), VN802HEXE (-TR), VN1002HEXE (-TR), VN1002HEXE2 (Exhaust air) (Return air) (TRA) (Outdoor air) (Supply air) (TOA) (TSA) (TFA) Applicable Refrigerant Refrigerant duct pipe size pipe size Nominal Gas side Liquid side diameter MMD-VNK502HEXE (-TR)

  • Page 16: Wiring Diagram

    Wiring diagram MMD-VNK502HEXE (-TR), MMD-VNK802HEXE (-TR), MMD-VNK1002HEXE (-TR), MMD-VNK1002HEXE2...
  • Page 17 Code Parts name Code Parts name Code Parts name CN** Connector TFA sensor DMV1 Decompression magnetic valve Fuse (printed circuit board) TCJ, TC1, TC2 Indoor coil sensor Pulse modulating valve Fuse (motor) Terminal block (power source) SW701 Dip switch Air supplying motor Terminal block (communication) 43F11, 43F12 Relay for air supplying motor Air exhausting motor...
  • Page 18 MMD-VN502HEXE (-TR), MMD-VN802HEXE (-TR), MMD-VN1002HEXE (-TR), MMD-VN1002HEXE2...
  • Page 19 Code Parts name Code Parts name Code Parts name CN** Connector TSA sensor SW701 Dip switch Fuse (printed circuit board) TFA sensor 43F11, 43F12 Relay for air supplying motor Fuse (motor) TCJ, TC1, TC2 Indoor coil sensor 43F21, 43F22 Relay for air exhausting motor Air supplying motor Terminal block (power source) RY701, RY702 Relay for air supplying motor...

  • Page 20: Refrigerating Cycle Diagram

    Refrigerating cycle diagram Indoor unit Liquid side side Sensor (TFA) Strainer Capillary Indoor Heat Exchanger (Expansion coil) Pulse modulating valve Sensor Strainer (TCJ) Sensor (TC2) Sensor (TC1) Sensor (TSA) Fan motor Component Description (Connector CN82 (6P): Blue) 1.Super heat control function in cooling Pulse modulating 2.Under cool control function in heating valve...

  • Page 21: Part Rating

    Part rating Air to Air Heat Exchanger with DX Coil Unit VNK502HEXE (-TR) VNK802HEXE (-TR) VNK1002HEXE (-TR) VNK1002HEXE2 Model MMD- VN502HEXE (-TR) VN802HEXE (-TR) VN1002HEXE (-TR) VN1002HEXE2 Supply air fan motor 4-pole induction motor Exhaust air fan motor 4-pole induction motor Capacitor for supply air 450 V, 5 F 450 V, 10 F...

  • Page 22: Control Outline

    Control outline Indoor unit (Air to Air Heat Exchanger with DX Coil Unit) Control specifications Item Specification outline Remarks When the 1) Judge the outdoor unit power is The outdoor unit is judged when the power is reset. The control is switched reset depending on the judgment result.
  • Page 23 Item Specification outline Remarks Ventilation 2) Without remote controller, RBC-AMT32 remote controller compatible mode switch • The ventilation mode can be switched depending on CODE (DN) [EA] (Continued) SET DATA Heat Ventilation mode Automatic exchange Ventilation 1) The ventilation fan speed is switched by the request from the remote controller. CODE No.
  • Page 24 Item Specification outline Remarks Auto 1) The outdoor unit determines the operational performance of the indoor unit Ts: Temperature setting capacity according to the difference between TRA and Ts. control * Ts refers to a value corrected in 6. Cool Heat PMV control 1) The Air to Air Heat Exchanger with DX Coil Unit performs PMV control using the...
  • Page 25 Item Specification outline Remarks Forced fan 2) During forced fan OFF, the operation is performed depending on the met condition 1 to 3. (Continued) • Condition 3 is met There is a possibility of condensation on the heat exchange element. Only the exhaust fan is operated for a given time to dry the heat exchange element.
  • Page 26 Item Specification outline Remarks Automatic 1) When the ventilation mode is "Automatic", the Heat Exchange or Bypass is mode control automatically selected depending on the operation mode and TRA, TOA, and TSA. " " Heat exchange Bypass Undefined zone Undefined zone Bypass Heat exchange TRA: Return air temperature (°C)
  • Page 27 Item Specification outline Remarks " " Automatic Heat mode control (Continued) Undefined zone Bypass Temperature setting: 25 °C Bypass Undefined zone Heat exchange TRA: Return air temperature (°C) 2) If the operation mode is changed, the Heat Exchange mode continues for 10 minutes.
  • Page 28 Item Specification outline Remarks Freeze 2) In Cool operation, the operation is performed depending on the temperature protection detected by TC2 or TCJ sensor. control • The thermo is turned off forcedly if the "M" zone is detected for 45 minutes. •...
  • Page 29 Item Specification outline Remarks Nighttime 5) During nighttime heat purge operation heat purge • The ventilation mode (fixed to Bypass mode) cannot be changed, and it is not displayed. (Continued) • The ventilation fan speed can be changed with CODE No. (DN) [47]. SET DATA Setting Low fixed (default)
  • Page 30 Item Specification outline Remarks Humidifying 3) Humidifying setting items control 1) Operation mode (Continued) Set the operation mode for humidifying depending on CODE (DN) [08]. SET DATA Operation mode Heating (default) Heating, Fanning 2) Humidity judgment by outdoor temperature Set whether to judge humidifying by outdoor air temperature TOA depending on CODE (DN) [BB].
  • Page 31 Item Specification outline Remarks Short 1) The operation continues for 5 minutes even if a thermo OFF condition is met. intermittent 2) The Cool / Heat switch, operation preparation, and protection control are given operation priority, and the thermo is turned off. guarantee control Retained...
  • Page 32 Item Specification outline Remarks Central 1) Depending on the central control device setting, the functions that can be operated • "Central control" appears (lights up) in control mode by the indoor unit remote controller can be changed. central control mode. switch 2) Settings •...

  • Page 33: Applied Control And Functions (Including Circuit Configuration)

    Applied control and functions (including circuit configuration) 8-1. Heat exchanger controller block diagram 8-1-1. When the main (sub) remote controller is connected Main (sub) header remote controller Schedule timer (up to 2 units) (when in weekly timer mode) Display Display driver Display Function setting...
  • Page 34 8-2. Indoor printed circuit board MMC-1615...
  • Page 35 8-3. Functions at test operation Checking COOL / HEAT test operation The COOL / HEAT test operation can be performed using the indoor remote controller or outdoor interface circuit board. ◆ Starting and stopping test operation Performing test operation from the indoor remote controller ▼...
  • Page 36 Indoor unit operation checking function (of the indoor unit) This function allows you to check the operations using the indoor unit only without communicating with the remote controller or outdoor unit. This function is available even while the system is running or stopped. However, if it is used for a long period of time, a malfunction may occur.
  • Page 37 8-4. Specifications of optional connectors on the Air to Air Heat Exchanger with DX Coil Unit board Connector Function Specification Note 0 V (COM) Remote controller Remote controller prohibition input (ON: Prohibited, OFF: prohibition input Allowed) External input Ventilation fan speed CN705 Ventilation fan speed change input (ON: LOW, OFF: HIGH) No-voltage contact a...
  • Page 38 8-5. Configuring the function settings of the indoor unit (When configuring the settings, use the wired remote controller.) <Procedure> Perform while the unit is stopped. Press and hold the button + button + button for 4 seconds or longer. The first displayed UNIT No. is the header unit address in the group control.
  • Page 39 Codes (DN codes) for changing settings (Necessary for local advanced control) Item Content Factory setting 0000: None 0001: 150 H 0002: 2500 H Filter sign lighting time 0002: 2500 H 0003: 5000 H 0004: 10000 H 0000: Normal 0001: High degree of dirt 0000: Normal Filter clogging (Half of standard time)
  • Page 40 Model Code : 10 Model name SET DATA Model (abbreviation) Air to Air Heat Exchanger MMD-VNK✽✽✽ series 0050 with DX Coil Unit MMD-VN✽✽✽ series Higher – Capacity of the Air to Air Heat Exchanger with DX Coil Unit Code : 11 SET DATA Type 0000*...
  • Page 41 8-6. Applied control of the indoor unit Control system using the remote control interface (TCB- IFCB4E2) [Wiring and settings] • In group control, the system works when connected to any indoor unit (control circuit) in the group. For the operation / error signals of other units, receive them from the units individually. (1) Control items 1) ON / OFF input Turn on / off the unit...

  • Page 42: Demand Control

    Off control [Function] • Controls the indoor units individually. Connect the wires to the control circuit board of the indoor unit. • In group control, connect the wires to the control circuit board of the indoor unit, and then set the CODE No. to the connected indoor unit.
  • Page 43 How to set the address manually using the remote controller To specify the indoor unit address first when the indoor wiring has been completed and outdoor wiring has not (Manually set using the remote controller) Make a pair of the indoor unit and remote (Wiring example for two lines) controller.
  • Page 44 Checking the address and main unit position using the remote controller ▼ Checking the indoor unit No. position (1) When you know the indoor unit position but want to know the address • Individual operation (a pair of wired remote controller and indoor unit) or group control <Procedure>...
  • Page 45 • Checking all the UNIT No. using a wired remote controller <Procedure> Perform while the unit is stopped. You can check the indoor unit No. and position in the same refrigerant piping. Select an outdoor unit. The indoor unit No. in the same refrigerant piping appear one by one.
  • Page 46 Changing the indoor address using the remote controller Changing the indoor address using the wired remote controller • Changing the indoor address in the individual operation (a pair of wired remote controller and indoor unit) or group control (Available when the address has already been set) <Procedure>...
  • Page 47 • Checking all the indoor unit addresses using a wired remote controller (Available when the address has already been set) <Content> You can change the indoor unit addresses in the same refrigerant piping using a wired remote controller • Enter the address check / change mode to change the address. <Procedure>...
  • Page 48 Error clearing function How to clear the error using the wired remote controller ▼ Clearing an error of the outdoor unit Clear the currently detected outdoor unit for each refrigerant line to which the indoor unit controlled by the remote controller is connected.
  • Page 49 Monitoring function of wired remote controller The following monitoring function is available if the remote controller of NRC-01HE or RBC-AMT32E is used. Display <Content> Enter the service monitoring mode using the remote controller to check the sensor temperature or operation status of the remote controller, indoor unit, and outdoor unit.
  • Page 50 CODE No. Remote controller display Data Format Unit example U1 U2 U3 U4 40 Detection pressure of high-pressure sensor (Pd) x 100 [0123] = 1.23 MPa 41 Detection pressure of low-pressure sensor (Ps) x 100 42 Discharge temperature of compressor 1 (Td1) °C 43 Discharge temperature of compressor 2 (Td2) °C...
  • Page 51 LED display of circuit board (1) D501 (Red) • Lights up when the power is turned on (Microcomputer works) • Blinks at 1-second intervals (0.5-second): No EEPROM, or writing error • Blinks at 10-second intervals (5-second): During DISP mode • Blinks at 2-second intervals (1-second): Function change being set (EEPROM) (2) D403 (Red) •...

  • Page 52: Troubleshooting

    Troubleshooting 9-1. Failure diagnosis (1) Before diagnosing failure (a) Model All models of Modular Multi Type (SMMS-i) All models of Air to Air Heat Exchanger with DX Coil Unit (MMD-VNK✽✽✽, MMD-VN✽✽✽) (b) Necessary tools / measuring instruments • Phillips-head driver, flat-head driver, spanner, pliers, nipper, thumbtack for reset switch, etc. •...
  • Page 53 9-2. How to check for errors The remote controller (local remote controller or central control) is equipped with an LCD that displays the operation status. If an error has occurred, see the following tables to check the error of the Air to Air Heat Exchanger with DX Coil Unit using the failure diagnosis function.
  • Page 54 (Local remote controller) Check code 7-segment display of Typical cause of error Description Local remote outdoor unit controller Sub code No header remote controller, Remote No signal can be received from the indoor unit. The header remote – – controller communication (reception) error controller has not been set (including double remote controllers).
  • Page 55 Check code list (Outdoor) (Example: Detected on the SMMS-i standard & thermal outdoor interface) Check code 7-segment display of outdoor unit Local remote Typical cause of error Description controller & TCC-LINK Sub code central controller Number of indoor units for normal No communication can be established any more.
  • Page 56 Check code 7-segment display of outdoor unit Local remote Typical cause of error Description controller & TCC-LINK Sub code central controller Outdoor discharge temperature Open-circuit or short-circuit of the outdoor discharge temperature – sensor (TD3) error sensor (TD3) was detected. –...
  • Page 57 Check code 7-segment display of outdoor unit Local remote Typical cause of error Description controller & TCC-LINK Sub code central controller 00: Open phase detected Open phase error / Blackout error Open phase error was detected when the power is turned on. 01: Compressor 1 Overvoltage / Undervoltage was detected in the inverter DC 02: Compressor 2...
  • Page 58 9-3. Troubleshooting Main remote controller (NRC-01HE) (1) Checking When an error occurred in the Air to Air Heat Exchanger with DX Coil Unit, the check code and the unit No. of Air to Air Heat Exchanger with DX Coil Unit appear on the display part of the remote controller.
  • Page 59 TCC-LINK central control remote controller (TCB-SC642TLE2) (1) Checking UNIT No. display Check code display When an error occurred in the Air to Air Heat Exchanger with DX Coil Unit, the check code and the unit No. of Air to Air Heat Exchanger Blinks alternately with DX Coil Unit appear on the display part of the remote controller.
  • Page 60 9-4. Check codes displayed on the remote controller and SMMS-i outdoor unit (I/F 7-segment display) and locations to be checked For other outdoor units, refer to the corresponding service manuals. Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local...
  • Page 61 Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local outdoor unit name remote detection controller Check Sub code code Automatic All stopped • The automatic indoor address Set the address again after Central control address start start setting has been configured...
  • Page 62 Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local outdoor unit name remote detection controller Check Sub code code Detected outdoor Terminal All stopped The center outdoor unit has • Check the check code of the unit No.
  • Page 63 Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local outdoor unit name remote detection controller Check Sub code code TO sensor error All stopped The sensor resistance is infinite or • Check the connector connection zero (open circuit or short circuit).
  • Page 64 Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local outdoor unit name remote detection controller Check Sub code code Pd sensor error All stopped The output voltage of the Pd sensor •...
  • Page 65 Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local outdoor unit name remote detection controller Check Sub code code Lower oil level All stopped The running compressor has <Check for all outdoor units in the detection detected low oil level for line>...
  • Page 66 Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local outdoor unit name remote detection controller Check Sub code code Oil detection All stopped The temperature change of TK1 • Check the TK1 sensor TK1 oil circuit circuit error cannot be detected even after...
  • Page 67 Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local outdoor unit name remote detection controller Check Sub code code Indoor Outdoor unit Only the target An error was found on the outdoor •...
  • Page 68 Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local outdoor unit name remote detection controller Check Sub code code Detect indoor Indoor External Only the target Signals are input into the external If an external device is connected addresses interlock for...
  • Page 69 Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local outdoor unit name remote detection controller Check Sub code code Detect indoor Indoor Indoor overflow All stopped • The float switch has worked. •...
  • Page 70 Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local outdoor unit name remote detection controller Check Sub code code High-pressure All stopped The Pd sensor detected a value • Check the Pd pressure sensor protection over 3.6 MPa.
  • Page 71 Check code 7-segment display of Location Check code System status Error detection conditions Items to check (locations) Local outdoor unit name remote detection controller Check Sub code code Indoor Other indoor Only the target Another indoor unit in the group is Check the indoor PC board.
  • Page 72 Notes on the compressor service When checking the inverter output, remove all the compressor wires. Checking the inverter output Shut down the power. Remove all the leads from the compressor. Turn on the power, and then start cooling or heating. Be careful not to touch the fasten terminals of the compressor leads or other parts of the set box.
  • Page 73 9-5. Diagnosis procedure for each check code...

  • Page 101: Segment Display Function

    9-6. 7-segment display function Outdoor unit 7-segment display (Interface board) The 7-segment display is equipped on the interface control board for checking the operation status. The display is changed by the combination of the setting numbers of the rotary switch on the board. Interface board Push switch 7-segment display [A]...
  • Page 102 (1)System data display (Displayed only on the center outdoor unit) SW01 SW02 SW03 Description Empty System capacity A […8] to [48]: 8 to 48 Horse power B [HP] Number of outdoor units A […1] to […4]: 1 to 4 B […P] Number of connected indoor units / A […0] to […48]: 0 to 48 (connected) Number of cooling-thermo-active...
  • Page 103 (2)Outdoor unit data display (Displayed on each outdoor unit) SW01 SW02 SW03 Description Error data A Displays outdoor unit No.: [U1] to [U4] B Displays the check code (Only the latest one). Displays [– – –] when there is no check code. If there is an auxiliary code, the check code [ ] appears for 3 seconds and the auxiliary code [–...
  • Page 104 (3)Outdoor cycle data display (Displayed on each outdoor unit) SW01 SW02 SW03 Description Pd pressure data Displays the Pd pressure data (MPaG) in decimal (MPaG: Approx. 1/10 of kg/cm P d. Ps pressure data Displays the Ps pressure data (MPaG) in decimal P S.
  • Page 105 (4)Outdoor cycle data display (Displayed on the center unit) * Used to display the terminal unit information on the 7-segment display of the center unit. SW01 SW02 SW03 Description Error data A [U. ] : SW03 setting No. + 1 (Outdoor unit No. U2 to U4) B Displays the check code (Only the latest one) When there is no check codee: [–...
  • Page 106 (5)Outdoor unit data display (Displayed only on the center outdoor unit) SW01 SW02 SW03 Description Indoor BUS communication B When received: [… … 1], When not received: [… … …] reception status Indoor check code B When there is no check code: [– – –] Indoor horse power B 0.2, 0.5, 0.8, …1, 1.2, 1.7, …2, 2.5, …3, 3.2, …4, …5, …6, …8, 1 0, 1 6, 2 0 Indoor request order...
  • Page 107 9-7. Oil judgment display You can check the current oil judgment results of the compressor using the switch setting of the outdoor unit interface board. Follow the procedure below. (1) Procedure Start running. Configure the switch setting of the interface board for the target outdoor unit as follows: Set [SW01 / 02 / 03] to [1 / 16 / 1].
  • Page 108 9-8. Leakage / Clogging of the refrigerant cycle circuit List of check codes displayed when a leakage / clogging error has occurred on the outdoor cycle component / oil circuit component <Clogging> Error location Unit where the Component Detected check code Phenomenon (See next page) error occurred...
  • Page 109 Fan motor Right side Heat exchanger Left side Heat exchanger Reducer Four-way valve Clack valve High-pressure sensor Low-pressure sensor Fusible plug separator Clack Clack valve valve High- High-pressure pressure Liquid tank Accumulator Compressor Compressor (Inverter) (Inverter) Clack Clack valve valve Oil header Clack valve Clack valve...
  • Page 110 List of check codes displayed when a leakage / clogging error has occurred on the outdoor cycle component / oil circuit component <Clogging> Error location Unit where the Component Detected check code Phenomenon (See next page) error occurred Outdoor PMV 1, 2, 4 Own unit High-pressure protection activation High-pressure rising...
  • Page 111 Fan motor Right side Main heat exchanger Right side sub heat exchanger Left side Main heat exchanger Clack valve Left side sub heat exchanger Clack valve Four-way valve High-pressure sensor Low-pressure Fusible plug sensor separator Accumulator Liquid tank High- High- High- pressure pressure...

  • Page 112: Sensor Characteristics

    9-9. Sensor characteristics (Outdoor unit) ▼ Temperature sensor characteristics Outdoor TS1, TE1, TE2, TL, TO sensor Temperature [°C] Resistance [k ] 114.8 83.9 62.1 46.5 35.2 Resistance 26.9 [k ] 20.7 (10 °C or lower) Resistance 16.1 [k ] 12.7 (10 °C or higher) 10.0 Temperature [°C]...
  • Page 113 (Outdoor unit) ▼ Pressure sensor characteristics • Input / Output combination table High-pressure (Pd) Low-pressure (Ps) Pin No. Input / Output name Lead color Input / Output name Lead color OUTPUT White — — — — OUTPUT White Black Black +5 V +5 V •...
  • Page 114 Indoor TC1 sensor Temperature [°C] Resistance [k ] 99.9 74.1 55.6 42.2 32.8 25.4 Resistance Resistance 19.8 [k ] [k ] (10 °C or higher) 15.6 (10 °C or lower) 14.2 10.0 Temperature [°C] Indoor TC2, TCJ sensor Temperature [°C] Resistance [k ] 115.2 84.2...

  • Page 115: Pressure Sensor Output Check

    9-10.Pressure sensor output check (Outdoor unit) ▼ Pd sensor characteristics 0 to 4.41 MPa (0.5 to 5 V output / 0 to 4.41 MPa) Indoor unit main board CN501: 2 – 3 pin voltage check (3 pin tester "–") VOLT VOLT VOLT VOLT...
  • Page 116 (Outdoor unit) ▼ Ps sensor characteristics 0 to 1.47 MPa (0.5 to 5 V output / 0 to 1.47 MPa) Indoor unit main board CN500: 2 – 3 pin voltage check (3 pin tester "–") VOLT VOLT VOLT VOLT VOLT (MPa) (kg/cm (MPa)

  • Page 117: Air To Air Heat Exchanger With Dx Coil Unit And Air-Conditioning System

    Air to Air Heat Exchanger with DX Coil Unit and air-conditioning system Examples of connections available when installing an Air to Air Heat Exchanger with DX Coil Unit (MMD-VNK✽✽✽, MMD-VN✽✽✽) Classified by specifications Remote controller line 1.Indoor unit compatible with Air 2.Indoor unit not yet compatible 3.Air to Air Heat Exchanger with * Adapter omitted...
  • Page 118 Pattern 3 Possible Pattern 4 Possible Pattern 5 Possible Pattern 6 Possible Pattern 7 Possible When linking a unit compatible with Air to Air Heat Exchanger with DX Coil Unit to one not yet compatible, you need to set a compatible unit as the group header unit.
  • Page 119 List of Indoor Units (SMMS Series) Compatible with the Air to Air Heat Exchanger with DX Coil Unit “ ” in the tables indicates an indoor unit compatible with the Air to Air Heat Exchanger with DX Coil Unit. * For the 4-way air discharge type, products produced in September 2010 or later are compatible. “...

  • Page 120: Owner's Manual (Excerpt)

    Owner's Manual (Excerpt)

  • Page 121: Part Names

    Owner’s Manual Part Names Air to Air Heat Exchanger with DX Coil Unit Water supply hole for the humidification element (VNK type only) Maintenance cover for the humidification element EA (Exhaust air) Humidification element OA (Outdoor air) (VNK type only) RA (Return air) Inspection cover for the heat exchange element...
  • Page 122 Owner’s Manual System Configuration The control method of this product differs depending on the system configuration. Operate it following the methods explained in the system configuration examples below. • For the actual system configuration, ask your dealer or the installer of the product for information. •...
  • Page 123 Owner’s Manual System example Operation Note C. Central control system The central controller can be used to If two control devices are (When controlling the Air conditioner and the Air to Air Heat ON/OFF the whole system and used; the central controller Exchanger with DX Coil Unit separately) separately ON/OFF groups of Air and the remote controllers...

  • Page 124: Part Names And Functions Of The Remote Controller

    Owner’s Manual Part Names and Functions of the Remote Controller Remote controller for the Air to Air Heat Exchanger with DX Coil Unit (NRC-01HE) ◆ Operation section • One of these remote controllers can be used to control both indoor air conditioner units and Air to Air Heat Exchanger with DX Coil Units (up to 8 Display units in total).
  • Page 125 Owner’s Manual button (Swing / Louver direction button (Ventilation fan speed button) button) (*1) Used to select the ventilation fan speed Operation lamp button (Ventilation mode button) Lights up during operation. Used to select a ventilation mode. Blinks when an error occurs or the protective button (Filter elevating button) (*1) device activates.
  • Page 126 Owner’s Manual ◆ Display section All indicators are displayed on the display example below for explanation. In reality, only the selected options will be displayed. Indications concerning Display controlling the Air to Air Heat Exchanger with DX Coil Unit are explained here. section For indications concerning an air conditioner, refer to the owner's manuals supplied with the remote controller and the air conditioner.
  • Page 127 Owner’s Manual Louver Number display. (*1) FAN indicator appears (blinks) only when the button is pressed. Power saving mode display (High) Displayed during capacity saving mode. (Low) Louver lock indicator (*1) * Displayed when (SA > EA) (*2) UNIT No. indicator the setting is (SA <...
  • Page 128 Owner’s Manual How to Use When using the remote controller for the Air to Air Heat Exchanger with DX Coil Unit (NRC-01HE) When you use the Air to Air Heat Exchanger with DX Coil Unit for the first time or change the settings, operate the remote following the procedure below.
  • Page 129 Owner’s Manual About air volume imbalance ( CAUTION [SA>EA] / [SA<EA]) For normal ventilation (High or Low): If the outdoor temperature falls to 15 °C or below in The volumes of the indoor air supply and outdoor air [Automatic mode] the system will automatically start to run in [Heat exchange mode] regardless of the mode exhaustion are set to the same level.
  • Page 130 Owner’s Manual About nighttime heat purge operation The conditions to start the nighttime heat purge • Nighttime heat purge is a function to reduce the operation room air conditioning load in the morning in The unit compares temperatures indoor and outdoor summer by exhausting the air indoor which has using the monitoring operation (for about 5 minutes) become warm while the air conditioner is...
  • Page 131 Owner’s Manual About humidifying (VNK type only) Humidifying is available during heating. REQUIREMENT • When the humidifying season is over, perform the drying operation for the humidifier. Even during humidifying season, perform the drying operation if the unit is not used for a long period of time (over a couple of weeks).

  • Page 132: Timer Operation

    Owner’s Manual Timer Operation Select a timer type from the following three: (Max. 168 hours) OFF timer : Stops running after a specified period. Repeat-OFF timer : Stops running after a specified period every time you use the unit. On timer : Starts running after a specified period.
  • Page 133 Owner’s Manual Installation Location Be careful of operation sounds • Do not install the unit in places where the outside temperature falls below 5 °C. • Locate the unit in a place secure enough so that the • Avoid installing near machines emitting high sounds and vibrations do not increase.

  • Page 134: Air Conditioner Operations And Performance

    Owner’s Manual Air Conditioner Operations and Performance Check before operation The protective device may activate in the following cases: • Turn on the power switch at least 12 hours before During cooling starting operation. • When the air intake or air discharge of the outdoor •...

  • Page 135: Filter Maintenance

    Owner’s Manual Maintenance Maintenance of the filter, heat exchange element, and humidifier WARNING Cleaning the filter, heat exchange element, humidifier element and other parts involves dangerous work in high places. Ask a qualified installer or service person to do it. Do not attempt it by yourself.
  • Page 136 Owner’s Manual Maintenance of the humidifier element The replacement cycle of the humidifier element varies greatly depending on the conditions of use. Refer to the cycles below as general replacement cycles. (They are not the terms of guarantee.) When the water hardness is 25 mg/L Every 5 years When the water hardness is 50 mg/L Every 3 years...

  • Page 137: Installation Manual (Excerpt)

    Installation Manual (Excerpt)

  • Page 138: Warning Indications On The Air Conditioner Unit

    Installation Manual Work undertaken Protective gear worn Protective gloves All types of work ‘Safety’ working clothing Electrical-related Gloves to provide protection for electricians and from heat work Work done at heights Helmets for use in industry (50 cm or more) Transportation of Shoes with additional protective toe cap heavy objects...
  • Page 139 Installation Manual Precautions for Safety WARNING General • Before starting to install the Air to Air Heat Exchanger with DX Coil Unit, read carefully through the Installation Manual, and follow its instructions to install the Air to Air Heat Exchanger with DX Coil Unit. •...
  • Page 140 Installation Manual • Do not install the unit in a machinery factory or a chemical plant, where a toxic gas containing acid, alkali, an organic solvent, or paint, or a gas containing a corrosive substance is generated. Gas poisoning or a fire may result. •...
  • Page 141 Installation Manual • Install the ducts to the outside inclined downward so that rainwater does not enter the ducts. Otherwise, water will enter the room and household goods will become wet. • Insulate the ducts from heat using a heat insulator to prevent condensation. Otherwise, furniture may be damaged. •...
  • Page 142 Installation Manual CAUTION New Refrigerant Air to Air Heat Exchanger with DX Coil Unit Installation • THIS Air to Air Heat Exchanger with DX Coil Unit ADOPTS THE NEW HFC REFRIGERANT (R410A) WHICH DOES NOT DESTROY OZONE LAYER. • The characteristics of R410A refrigerant are; easy to absorb water, oxidizing membrane or oil, and its pressure is approx.

  • Page 143: Accessory Parts

    Installation Manual Accessory Parts Name Quantity Shape Usage Installation manual This manual (Be sure to hand it to the customers.) CD-ROM (For other languages that do not appear in this manual, (Owner’s manual, — please refer to the enclosed CD-ROM.) Installation manual) Owner’s manual —...

  • Page 144: Restrictions On System Construction

    Installation Manual Restrictions on System Construction System combinations available The Air to Air Heat Exchanger with DX Coil Unit can be connected to a Super Module Multi system -i. Range of combination 1. The Air to Air Heat Exchanger with DX Coil Unit can be connected with either one of the following multi systems: •...

  • Page 145: Selection Of Installation Place

    Installation Manual Selection of Installation Place more, or when the draining pipe is clogged, water CAUTION droplets may fall from the unit. • Place near a door or window exposed to humid • Do not install the Air to Air Heat Exchanger with outside air (Dew dropping may form.).
  • Page 146 Installation Manual Installation in high-humidity places • Do not use the unit in a kitchen or bathroom. If the unit is used in a place where much oil smoke is generated or a place with high humidity, the filter or the heat exchanging element will become clogged and the unit will not work.

  • Page 147: Installation Of Indoor Unit

    Installation Manual Installation of Indoor Unit WARNING • Install the air conditioner at enough strong place to withstand the weight of the unit. If the strength is not enough, the unit may fall down resulting in injury. • To provide against strong wind or an earthquake, install the unit appropriately. Inappropriate installation may result in the unit falling down and causing an accident.
  • Page 148 Installation Manual Unit: mm Model No. MMD-VNK502HEXE, VN502HEXE 1,690 1140 1140 MMD-VNK802HEXE, VN802HEXE 1,739 1189 1189 MMD-VNK1002HEXE, VN1002HEXE 1,739 1189 1189 MMD-VNK1002HEXE2, VN1002HEXE2 1,739 1189 1189 Diameter of Diameter of Duct refrigerant refrigerant Model No. diameter piping at the piping at the gas side (L) liquid side (M) MMD-VNK502HEXE, VN502HEXE...

  • Page 149: Installing The Indoor Unit

    Installation Manual Installing the indoor unit Attaching the duct connector Attach 4 duct connectors to the unit using the six screws supplied for each connector. Duct connector Screws Attaching the washers and nuts Procure the hanging bolts, nuts, and washers locally. Attach the washers and nuts to the hanging bolt (M12) as shown in the figure on the right.

  • Page 150: Drain Piping Work

    Installation Manual Drain Piping Work Connecting drain pipe CAUTION • Connect the elbow for vinyl chloride pipe VP25 Install drain pipes to drain water securely referring downward to the drain outlet. to the Installation Manual. In addition, insulate the • Position the tip of the drain pipe so that water can be pipes from heat to prevent condensation.
  • Page 151 Installation Manual Water Supply Piping for a Humidifier (VNK type only) CAUTION Install the water supply pipes after washing the inside of them with water. Install a drain valve on the water supply pipe, then drain the water until the drained water runs clear. Do not to allow cutting fluid or detergent to enter the pipes.

  • Page 152: Installation Of Ducts

    Installation Manual Installation of Ducts CAUTION Insulate the ducts to prevent condensation. Inappropriate installation results in water leaking into the room and furniture may be damaged. Suction duct length must be longer than 850 mm. Installing ducts Insert the duct into the duct connector, then fix the duct using aluminum tape to prevent air from leaking.
  • Page 153 Installation Manual Refrigerant Piping and Vacuuming WARNING • Ventilate the room if a refrigerant gas is leaking during the installation work. If the leaking refrigerant gas comes in contact with fire, a toxic gas is generated. • After installation, confirm that no refrigerant gas is leaking. If the leaking refrigerant gas comes in contact with fire from a fan heater, a stove, or a gas range, a toxic gas is generated.
  • Page 154 Installation Manual Flaring dia. meter size: A (Unit: mm) * In case of flaring for R410A with the Outer dia. of copper –0.4 conventional flare tool, pull it out approx. pipe R410A 0.5 mm more than that for R22 to adjust to the specified flare size.

  • Page 155: Heat Insulation

    Installation Manual Heat insulation Apply heat insulation for the pipes separately at liquid side and gas side. • For the heat insulation to the pipes at gas side, be sure to use the material with heat-resisting temperature 248 °F (120 °C) or higher. •...

  • Page 156: Electric Wiring

    Installation Manual Electric Wiring WARNING • Use predefined wires and connect them certainly. Keep the connecting terminals free from external force. Improper wire connection or clamping may result in exotherm, fire or malfunction. • Connect earth wire. (grounding work) Incomplete grounding cause an electric shock. Do not connect ground wires to gas pipes, water pipes, lightning rods or ground wires for telephone wires.
  • Page 157 Installation Manual Communication line Item Indoor / Outdoor inter-unit wiring (*2) (2 Model name cables) Remote controller wiring (*4) MMD- Central control line wiring (*3) (2 cables) VNK502HEXE VN502HEXE VNK802HEXE (Up to 1000 m) VN802HEXE Air to Air Heat 2-core, non-polarity shield wire: 1.25 mm Exchanger with 2-core, non-polarity: 0.5 to 2.0 mm VNK1002HEXE...

  • Page 158: Connection Diagram

    Installation Manual Connection diagram External output *5 External input (sold separately) (220-240V~, under 1A each) No voltage a-contact input 1 Common Operation output 2 Remote controller operation Connector Connector Common 3 Fan speed (White) (Black) External damper output Yellow Yellow Abnormal / Bypass 5 Operation mode output...
  • Page 159 Installation Manual Switches and connectors on the circuit board Remove the 4 screws to detach the cover. * Refer to “Advanced System” for how to set the switch. Changeover switch for pulse / static SW701 (No.1) Pulse: ON Static: OFF Connectors for the external input Connect the remote ON/OFF adapter (NRB-1HE: sold separately)

  • Page 160: Wiring Connection

    Installation Manual Wiring connection NOTE • When performing transition wiring for the remote controllers, polarity is not needed to be considered when connecting wires to the terminal A and B on the indoor unit terminal block. • Leave an extra length of 100 mm for each wiring so that servicing can be performed more easily. •...

  • Page 161: Remote Controller Wiring

    Installation Manual Remote controller wiring Wiring diagram Remote controller wire (locally procured) Indoor unit remote Remote controller unit controller terminal block Remote controller terminal block * Use a 0.5 mm to 2 mm wire. Address setting Refer to the Installation Manual of the outdoor unit for address setting. * When the Air to Air Heat Exchanger with DX Coil Unit system linked with indoor air conditioners is used, set the Air to Air Heat Exchanger with DX Coil Unit as “Follower”, referring to “Setting the address manually using the remote controller”...

  • Page 162: Wiring Example

    Installation Manual Wiring between indoor and outdoor units NOTE An outdoor unit connected with control wiring between indoor and outdoor units wire becomes automatically the header unit. Wiring example Outdoor Power supply Outdoor Power supply 380 V - 415 V ~, 50 Hz 380 V - 415 V ~, 50 Hz 380 V ~, 60 Hz 380 V ~, 60 Hz...
  • Page 163 Installation Manual System Configuration Settings and electric wiring differ depending on the system configuration. Perform electric wring according to the system examples shown in the table below. System example Operation A. Air to Air Heat Exchanger with DX Coil Unit system You can use the remote controller to ON/OFF running the Air to Air Heat Exchanger with DX Coil Unit.
  • Page 164 Installation Manual System example Operation C. Central control system The Central controller can be used to ON/OFF the whole system (When controlling groups of air conditioners and the Air to Air Heat and separately ON/OFF groups of air conditioners and the Air Exchanger with DX Coil Unit separately) to Air Heat Exchanger with DX Coil Unit.
  • Page 165 Installation Manual Installing two remote controllers for the Air to Air Heat Exchanger with DX Coil Unit For details on how to install the remote controller for the Air to Air Heat Exchanger with DX Coil Unit, refer to the Installation Manual accessory with the remote controller.

  • Page 166: Advanced System

    Installation Manual Advanced System WARNING • Use wiring that meets the specifications in the Installation Manual and the stipulations in the local regulations and laws. Use of wiring which does not meet the specifications may give rise to electric shocks, electrical leakage, smoking and / or a fire.
  • Page 167 Installation Manual Switching the remote controller between invalid / valid or low / high from an external device (separately sold External Input) * Perform connection with one of the units in the group. * Static signal only Insert the remote ON/OFF adapter NRB-1HE (sold separately) into connector CN705. •...
  • Page 168 Installation Manual 2) When switching between low / high from an external device Adapter for remote ON/OFF control (locally procured) NRB-1HE CN705 (1), (3) No voltage Green (1) a-contact Yellow (2) Red (3) White (4) Low is applied when SW2 is closed, and High when Black (5) it is open.
  • Page 169 Installation Manual Connecting an auxiliary fan or monitoring operation output (External Output) 220-240 V~, 50 Hz Power supply 220 V~, 60 Hz Auxiliary Contact If external devices is used working at a higher voltage and current than the rated values, install Lamp or management device a relay according to the diagram below.
  • Page 170 Installation Manual The electric damper (electric shutter) works during normal operation, and nighttime heat purge operation. • The electric damper (electric shutter) also works in the following circumstances: * While the operation is paused during nighttime heat purge operation * While operating in cold mode (Temperature is below 10 °C.) •...

  • Page 171: Advanced Control

    Installation Manual Advanced Control REQUIREMENT When using the Air to Air Heat Exchanger with DX Coil Unit for the first time, it will take some moments after the power has been turned on before the remote controller becomes available for operations: This is normal and is not indicative of trouble.
  • Page 172 Installation Manual Using TIMER time buttons, select SET DATA [ Push button. When the display changes from flashing to lit, the setup is completed. • To change settings of another indoor unit, repeat from Procedure • To change other settings of the selected indoor unit, repeat from Procedure button to clear the settings.
  • Page 173 Installation Manual Codes (DN codes) for changing settings Codes in the table below are necessary for local advanced control. Code Description SET DATA and description Factory default Note Lighting-up hours of 0000: None 0002: 2500 H Adjusting this setting is the Filter Sign necessary for the header unit.

  • Page 174: Group Control

    Installation Manual Group control In a group control, a remote controller can control up to maximum 8 units. • For wiring procedure and wiring method of the individual line (Identical refrigerant line) system, refer to “Electric Wiring” in this Manual. •...
  • Page 175 Installation Manual Setting the single operation of the Air to Air Heat Exchanger with DX Coil Unit (Setting for the header air conditioner) Single operation of the Air to Air Heat Exchanger with DX Coil Unit is possible when operation of the Air to Air Heat Exchanger with DX Coil Unit is linked with that of the air conditioners.

  • Page 176: Ventilation Mode Setting

    Installation Manual Nighttime heat purge setting Nighttime heat purge exhausts hot air in the room by bypass mode and reduces the cooling load in the morning. Monitoring operation starts after [Setting value] x 1 hour(s). (1 to 48 hours) * Adjust this setting for all the Air to Air Heat Exchanger with DX Coil Units in the group. (Only when the Air to Air Heat Exchanger with DX Coil Unit(s) operates link with air conditioners) * This setting is invalid for a system equipped with the Air to Air Heat Exchanger with DX Coil Unit only.
  • Page 177 Installation Manual Ventilation Fan speed setting The setting of the ventilation Fan speed can be changed when using the remote controller for air conditioners (RBC-AMT32E, RBC-AMS41E) or using the system without the remote controller. * Adjusting this setting is necessary for the header unit when using a system equipped with the Air to Air Heat Exchanger with DX Coil Unit only (RBC-AMT32E can not be used.), and for the Air to Air Heat Exchanger with DX Coil Unit with the smallest address number when using a system equipped with the Air to Air Heat Exchanger with DX Coil Unit and air conditioners.
  • Page 178 Installation Manual Abnormal signal / bypass mode signal output setting Terminals 3 to 5 for external output can be used to detect an abnormal signal / bypass mode signal output. Output signal to be detected can be selected. * Adjust this setting for the Air to Air Heat Exchanger with DX Coil Unit to which an external output is connected. * When [0000] is selected, signal transfer is on if one of the units in the group has trouble.

  • Page 179: Fan Characteristics

    Installation Manual Fan Characteristics ◆ MMD-VNK502HEXE Standard air volume: 500 m /h, Lower limit air volume: 330 m /h, Upper limit air volume: 600m 50 Hz 230 V 60 Hz 220 V Extra High High Extra High High High High Extra Extra High...
  • Page 180 Installation Manual MMD-VNK802HEXE ◆ Standard air volume: 800 m /h, Lower limit air volume: 480 m /h, Upper limit air volume: 960 m 50 Hz 230 V 60 Hz 220 V Extra High High Extra High High High High Extra High Extra High Air volume (m Air volume (m...
  • Page 181 Installation Manual MMD-VNK1002HEXE ◆ Standard air volume: 950 m /h, Lower limit air volume: 640 m /h, Upper limit air volume: 1140 m 50 Hz 230 V 60 Hz 220 V Extra High Extra High High High High High Extra High Extra High Air volume (m Air volume (m...

  • Page 182: Test Run

    Installation Manual Test Run Before test run Wired remote controller (NRC-01HE) • Before turning on the power supply, carry out the following procedure. 1. Using 500 V-megger, check that resistance of 1 M or more exists between the terminal block of the power supply and the earth (earthing).
  • Page 183 Installation Manual Use the [ VENT MODE] button to select “ Auto ventilation” or “ Total heat exchanging ventilation”. After the test run, push button to stop a test run. (Display part is same as procedure 1.) Push check button to cancel the test run mode.

  • Page 184: Exchanging And Assembling The Main Components

    Exchanging and assembling the main components Component Procedure Note Inspection cover 1.Remove the fixing cover, loosen the fixing screw, Fixing screw Fixing lever and then remove the inspection cover. Heat exchange 2.Hold the handle of the heat exchange element, and Handle of Heat exchanger then pull it out.
  • Page 185 Component Procedure Note Electrical control 5.Remove the four screws (M4 × 10) that fix the electrical control cover, and then remove the cover. cover Screws (M4 × 10) Removing 6.Open the electrical control cover, and disconnect the Push this part with two connectors (black, white) connected to the motor wire your nail to disconnect...
  • Page 186 Component Procedure Note 10. Remove the box nut, spring washer, and washer 800 / 1000 type that fix the fan, and then remove the fan. (Continued) 1. to 4., Note: Box nut 6. to 10. Do not lose the key and washer left in the motor Spring washer shaft.
  • Page 187 Component Procedure Note Motor holder 13. Remove the four screws (M4 × 6) that fix the motor 500 type holder and bell mouth, then pull the holder out. Bell mouth Screws (M4 × 6) 1. to 6., 8. to 11., 13. Exhaust casing 14.
  • Page 188 Component Procedure Note Lid holder 17. Remove the two screws (M4×6) that fix the lid holder, then remove the holder. 15., 17. Two screws per location (there are two locations). Screws (M4 × 6) Fixing lever 18. Widen the fixing lever to remove it from the gutter. 1., 18.
  • Page 189 Component Procedure Note Damper 23. Remove the damper from the damper motor Damper support holder. 1., 2., 19. to 23. Remove the louver motor, and then remove the damper from the damper support. Electrical control 24. Disconnect all the connectors from the PC board. base 5., 24.
  • Page 190 Component Procedure Note PC board 27. Remove the earth screws, and then remove the six spacers from the PC board. 5., 24., 27. Spacer Squeeze the lock to remove Earth Power supply 28. Remove the fasten terminals. Screws (M4 × 14) Pull out the Remove the screws that fix the power supply terminal block...
  • Page 191 Component Procedure Note Fuse 32. Pull out the fuse upward. 5., 32. Capacitor 33. Remove the fasten terminals. Screws (M4 × 14) Remove the screws that fix the capacitors, and 5., 24., 27., 33. then remove them. Note: Number of capacitors is different depending on the model.
  • Page 192 Component Procedure Note Sensor (TOA) 36. Disconnect the sensor (TOA) connectors from the Clamp PC board and clamp. (Continued) 1., 2., 5., 35., 36. Sensor (TOA, Brown) TA sensor (TRA) 37. Remove the two screws (M4 × 10) that fix the cover, and then remove the cover.
  • Page 193 Component Procedure Note Inspection cover 2 40. Loosen the six screws and then remove the inspection cover 2. Screws * The inspection cover and screws are a set. Spacer 41. Hold the handle of the spacer, and then pull it toward you.
  • Page 194 Component Procedure Note Humidifying element 44. Turn the cord clip to remove the sensor assembly Humidifying element reception reception Remove the two tapping screws (M4 × 10) that fix 40. to 44. the humidifying element reception, and lift it up then Cord clip pull it toward you.
  • Page 195 Component Procedure Note Supply water branch 47. Slide the hose band to remove the supply water Supply water branch hose. 40. to 42., 46., 47. <VNK type only> Supply water hose 3 Hose band Inspection cover 3 48. Remove the five truss head tapping screws (M4 × 10) that fix the inspection cover 3, and slide the cover to the left to remove the cover.
  • Page 196 Component Procedure Note Evaporator assembly 51. Remove the two truss head tapping screws (M4 × 10) that fix the evaporator assembly, and pull the 40., 41., 48. to 51. evaporator assembly toward you. Tapping screws (M4 × 10) Evaporator block 52.
  • Page 197 Component Procedure Note Separation board 55. Use pliers or the like to push inward the sensor assembly 1 fixed on the separation board. 40., 41., 48., 49., 54., Remove the three truss head tapping screws (M4 × 10) that fix the separation board. Push the lower part of the separation board deep to pull it toward you.
  • Page 198 Component Procedure Note Magnetic valve 59. Pull out the two fasten terminals coming from the Fasten terminal cord bush to the PC board (Lower protective tube: assembly Black). 1., 2., 5., 40., 41., 48., Remove the magnetic valve cord from the electrical 49., 54., 55., box clamp and from the clamp in the main unit on 57.
  • Page 199 Component Procedure Note Decompression 62. Remove the two truss head tapping screws (M4 × Decompression magnetic Decompression magnetic 10) on the side of the decompression magnetic magnetic valve valve cover (up) valve cover (side) valve assembly, and remove the decompression 40., 41., 48., 49., 54., magnetic valve covers (up and side).
  • Page 200 Component Procedure Note Hose band 67. Remove the hose band. (Supply water branch side) 40. to 42., 46., 47., <VNK type only> Hose band Hose band 68. Remove the hose band. (Decompression magnetic valve assembly side) 40., 41., 48., 49., 54., 55., 57., 61., 68.
  • Page 201 Component Procedure Note Sensor assembly 2 71. Remove the sensor assembly 2 connector coming Clamp Sensor assembly 2 (Green) from the cord bush to the PC board. 1., 2., 5., 40. to 45., Remove the sensor assembly 2 cord from the 48., 49., 71.
  • Page 202 Component Procedure Note Filter 73. Slide the filter horizontally to remove it from the heat exchange element. 1., 2., 73. * When attaching, be careful of the label direction of the filter side. Filter Heat exchange element Thermal insulation 74. Slide the thermal insulation cover along the thermal insulation pipe, and then pull it down to remove it.

  • Page 203: How To Replace The Pc Board For Service On The Air To Air Heat Exchanger With Dx

    How to replace the PC board for service on the Air to Air Heat Exchanger with DX Coil Unit <Model> 431-6V-456 MMD-VN(K)✽✽✽HEXE series (MCC-1615) Note on replacing the PC board for service on the Air to Air Heat Exchanger with DX Coil Unit Before replacing the PC board on the Air to Air Heat Exchanger with DX Coil Unit, non-volatile memory (hereinafter referred to as EEPROM (IC503)) on it stores the important data such as the model code, the capacity code (factory default), the group address, and the nighttime heat purge settings set automatically or manually (when installing the unit).
  • Page 204 *1 Reading the settings from the EEPROM (Read both the setting data adjusted locally and the factory default setting data.) (1) Press and hold the buttons for 4 seconds or longer. (this number indicates the one in "<Remote controller> NRC-01HE" on page 3) •...
  • Page 205 *3 Writing the settings into the EEPROM (The EEPROM settings on the PC board for service are the factory settings.) (1) Press and hold the buttons for 4 seconds or longer. (this number indicates the one in "<Remote controller> NRC-01HE") •...
  • Page 206 Notes on the setting items (Code list : Example) Item Memo Factory setting Filter sign lighting time 0002 : 2500 H Filter clogging 0000 : Normal Central address 0099 : Unfixed Specific indoor unit priority 0000 : No priority Heat intake temperature shift 0002 : +2 °C Cold only 0000 : Heat pump...

  • Page 207: Exploded Views And Parts List

    Exploded views and parts list Heat exchanger side MMD-VNK502HEXE, 802HEXE, 1002HEXE, 1002HEXE2, 502HEXE-TR, 802HEXE-TR, 1002HEXE-TR MMD-VN502HEXE, 802HEXE, 1002HEXE, 1002HEXE2, 502HEXE-TR, 802HEXE-TR, 1002HEXE-TR...
  • Page 208 Box elect MMD-VNK502HEXE, 802HEXE, 1002HEXE, 1002HEXE2, 502HEXE-TR, 802HEXE-TR, 1002HEXE-TR MMD-VN502HEXE, 802HEXE, 1002HEXE, 1002HEXE2, 502HEXE-TR, 802HEXE-TR, 1002HEXE-TR...
  • Page 209 Air conditioner side (VNK type) MMD-VNK502HEXE, 802HEXE, 1002HEXE, 1002HEXE2, 502HEXE-TR, 802HEXE-TR, 1002HEXE-TR...
  • Page 210 Air conditioner side (VN type) MMD-VN502HEXE, 802HEXE, 1002HEXE, 1002HEXE2, 502HEXE-TR, 802HEXE-TR, 1002HEXE-TR...

  • Page 211: Parts List

    Parts list Number of use Component Component Component Outline code HOLDER, LID 41112642 LEVER, LID 41112643 COUPLING 41112644 DAMPER 41118647 DAMPER 41118648 HEAT EXCHANGER 41119475 HEAT EXCHANGER 41119476 HOLDER, MOTOR 4111A534 CASE ASSY, EXHAUST 4111A570 CASE ASSY, EXHAUST 4111A571 BELL MOUTH 4111A572 STAY, DAMPER MOTOR 4111A573...
  • Page 212 Number of use Component Component Component Outline code LID, BOX ELECT 43162067 LID, BOX ELECT 43162068 LID, BOX ELECT 43162069 PC BOARD, MCC-1615 4316V456 CAPACITOR 41171309 RELAY, LY-1F 43154156 FUSE 43060678 AC250 V, 15 A TERMINAL, 4P 43160561 TERMINAL, 2P 43160467 TERMINAL BLOCK, 2P 41177893...
  • Page 213 Number of use Component Component Component Outline code SHEET SET 43195227 COVER, STRAINER 43111353 STRAINER 43170265 RING, O 43195226 GUIDE, EVAPORATOR 43119511 SWITCH, FLOAT ASSY 43151310 FIX, SENSOR 43119512 SENSOR ASSY -1 43150347 SENSOR ASSY -2 43150348 SENSOR ASSY -3 43150349 MANUAL, SET 431S8229...
  • Page 214 2nd publication in Mar.2012 ; File No.A10-022-2,REVISED EDITION 2 1st publication in Sep.2011 ; File No. A10-022, Revised Specifications subject to change without notice.

This manual is also suitable for:

Mmd-vnk502hexeMmd-vnk802hexe-trMmd-vnk1002hexe-trMmd-vnk1002hexeMmd-vn502hexeMmd-vn802hexe ... Show all

Table of Contents