Mitsubishi Electric PUZ-WM50VHA Service Manual
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Mitsubishi Electric PUZ-WM50VHA Service Manual

Air to water heat pump units
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AIR TO WATER HEAT PUMP UNITS
SERVICE MANUAL
[Model Name]
PUZ-WM50VHA
PUZ-WM60VAA
PUZ-WM85VAA
PUZ-WM85YAA
PUZ-WM112VAA
PUZ-WM112YAA
Salt proof model
PUZ-WM50VHA-BS
PUZ-WM60VAA-BS
PUZ-WM85VAA-BS
PUZ-WM85YAA-BS
PUZ-WM112VAA-BS
PUZ-WM112YAA-BS
PUZ-WM50VHA.UK
[Service Ref.]
PUZ-WM50VHA.UK
PUZ-WM60VAA.UK
PUZ-WM85VAA.UK
PUZ-WM85YAA.UK
PUZ-WM112VAA.UK
PUZ-WM112YAA.UK
PUZ-WM50VHA-BS.UK
PUZ-WM60VAA-BS.UK
PUZ-WM85VAA-BS.UK
PUZ-WM85YAA-BS.UK
PUZ-WM112VAA-BS.UK
PUZ-WM112YAA-BS.UK
R32
CONTENTS
1. REFERENCE MANUAL ································ 2
2. SAFETY PRECAUTION ······························· 3
3. SPECIFICATIONS ······································ 10
4. DATA ··························································· 12
5. OUTLINES AND DIMENSIONS·················· 13
6. WIRING DIAGRAM ····································· 15
7. WIRING SPECIFICATIONS ························ 18
8. REFRIGERANT SYSTEM DIAGRAM ········ 19
9. TROUBLESHOOTING ································ 22
11. DISASSEMBLY PROCEDURE ··················· 66
PARTS CATALOG (OCB727)
March 2020
No. OCH727
Note:
• This manual describes
service data of the outdoor
units only.
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Summary of Contents for Mitsubishi Electric PUZ-WM50VHA

  • Page 1 AIR TO WATER HEAT PUMP UNITS March 2020 No. OCH727 SERVICE MANUAL Note: [Model Name] [Service Ref.] • This manual describes PUZ-WM50VHA.UK PUZ-WM50VHA service data of the outdoor units only. PUZ-WM60VAA.UK PUZ-WM60VAA PUZ-WM85VAA.UK PUZ-WM85VAA PUZ-WM85YAA.UK PUZ-WM85YAA PUZ-WM112VAA PUZ-WM112VAA.UK PUZ-WM112YAA PUZ-WM112YAA.UK...
  • Page 2 REFERENCE MANUAL INDOOR UNIT SERVICE MANUAL 1-1. FOR AIR TO WATER SYSTEM Service Model name Service ref. manual No. EHPT17X-VM2D EHPT17X-VM2D.UK EHPT17X-VM6D EHPT17X-VM6D.UK EHPT17X-YM9D EHPT17X-YM9D.UK ERPT17X-VM2D ERPT17X-VM2D.UK EHPT20X-MED EHPT20X-MED.UK EHPT20X-VM6D EHPT20X-VM6D.UK EHPT20X-YM9D EHPT20X-YM9D.UK EHPT20X-YM9ED EHPT20X-YM9ED.UK OCH714 EHPT20X-TM9D EHPT20X-TM9D.UK OCB714 EHPT20X-MHEDW EHPT20X-MHEDW.UK ERPT20X-MD ERPT20X-MD.UK...
  • Page 3 SAFETY PRECAUTION SAFETY PRECAUTION SAFETY PRECAUTION MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of heat pump unit. WARNING In case that refrigerant type is R32, this unit uses a flammable refrigerant. (Risk of fire) If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire.
  • Page 4 [1] Warning for service (1) Do not alter the unit. (2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe components specifically made for use with refrigerant specified in the outdoor unit installation manual. (3) Ask a dealer or an authorized technician to install, relocate and repair the unit.
  • Page 5 [4] Cautions for unit using R32 refrigerant Pay careful attention to the following points. (1) Information on servicing (1-1) Checks on the Area Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ignition is minimized.
  • Page 6 (3) Repair to intrinsically Safe Components Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the equipment in use. Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmos- phere.
  • Page 7 b) Isolate system electrically. c) Before attempting the procedure, ensure that: • mechanical handling equipment is available, if required, for handling refrigerant cylinders; • all personal protective equipment is available and being used correctly; • the recovery process is supervised at all times by a competent person; •...
  • Page 8 2-3. PRECAUTIONS WHEN REUSING EXISTING R22/R410a REFRIGERANT TOOLS Cautions for refrigerant piping work Tools for R32 (The following table shows whether conventional tools can be used or not.) Tools and materials R32 tools Can R22 tools be used? Can R407C tools be used? Can R410a tools be used? ×...
  • Page 9 2-6. Minimum installation area If you unavoidably install a unit in a space where all four sides are blocked or there are depressions, confirm that one of these situations (A, B or C) is satisfied. Note: These countermeasures are for keeping safety not for specification guarantee. A) Secure sufficient installation space (minimum installation area Amin).
  • Page 10 SPECIFICATIONS 3-1. SPECIFICATIONS PUZ-WM50VHA.UK PUZ-WM60VAA.UK PUZ-WM85VAA.UK PUZ-WM85YAA.UK Service Ref. PUZ-WM50VHA-BS.UK PUZ-WM60VAA-BS.UK PUZ-WM85VAA-BS.UK PUZ-WM85YAA-BS.UK Power source (Phase, cycle, voltage) Single, 50 Hz, 230 V Single, 50 Hz, 230 V Single, 50 Hz, 230 V 3-Phase, 50 Hz, 400 V Max. current 13.0...
  • Page 11 Note: If the value of water flow rate and return water temp. become lower than the available range, it could cause damage to the parts of unit. Heating Cooling PUZ-WM50VHA(-BS) PUZ-WM50VHA(-BS) Minimum return water temperature due to the water quantity of system Minimum return water temperature due to the water quantity of system 23.0...
  • Page 12 DATA NOISE CRITERION CURVES PUZ-WM50VHA.UK PUZ-WM50VHA-BS.UK SPL(dB) MODE LINE COOLING HEATING MICROPHONE NC-70 UNIT NC-60 1.5 m NC-50 GROUND NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz PUZ-WM60VAA.UK PUZ-WM60VAA-BS.UK PUZ-WM112VAA.UK PUZ-WM112VAA-BS.UK...
  • Page 13 OUTLINES AND DIMENSIONS PUZ-WM50VHA.UK PUZ-WM50VHA-BS.UK Unit: mm OCH727...
  • Page 14 PUZ-WM60VAA.UK PUZ-WM85VAA.UK PUZ-WM85YAA.UK PUZ-WM60VAA-BS.UK PUZ-WM85VAA-BS.UK PUZ-WM85YAA-BS.UK PUZ-WM112VAA.UK PUZ-WM112YAA.UK PUZ-WM112VAA-BS.UK PUZ-WM112YAA-BS.UK Unit: mm OCH727...
  • Page 15 WIRING DIAGRAM PUZ-WM50VHA.UK PUZ-WM50VHA-BS.UK OCH727...
  • Page 16 PUZ-WM60VAA.UK PUZ-WM85VAA.UK PUZ-WM112VAA.UK PUZ-WM60VAA-BS.UK PUZ-WM85VAA-BS.UK PUZ-WM112VAA-BS.UK OCH727...
  • Page 17 PUZ-WM85YAA.UK PUZ-WM112YAA.UK PUZ-WM85YAA-BS.UK PUZ-WM112YAA-BS.UK OCH727...
  • Page 18 WIRING SPECIFICATIONS FIELD ELECTRICAL WIRING (power wiring specifications) WM50V WM60V WM85V WM112V WM85Y, WM112Y Outdoor unit model 3N~ (3 ph 4-wires), ~/N (single), 50 Hz, 230 V Outdoor unit power supply 50 Hz, 400 V 16 A 16 A 25 A 32 A 16 A Outdoor unit input capacity Main switch (Breaker) *1...
  • Page 19 Refrigerant flow in cooling Symbol Part name Detail COMP Compressor DC inverter twin rotary compressor (Mitsubishi Electric Corporation) H/P SW High pressure switch (63H) For protection (OFF: 4.15MPa) REV/V Reversing (4-way) valve (21S4) Change the refrigerant circuit (Heating/Cooling) and for Defrosting...
  • Page 20 Refrigerant flow in heating Symbol Parts name Detail COMP Compressor DC inverter scroll compressor (Mitsubishi Electric Corporation) H/P SW High pressure switch (63H) For protection (OFF: 4.15MPa) REV/V Reversing (4-way) valve (21S4) Change the refrigerant circuit (Heating / Cooling) and for Defrosting...
  • Page 21 Refrigerant flow in heating Symbol Parts name Detail COMP Compressor DC inverter scroll compressor (Mitsubishi Electric Corporation) H/P SW High pressure switch (63H) For protection (OFF: 4.15MPa) REV/V Reversing (4-way) valve (21S4) Change the refrigerant circuit (Heating / Cooling) and for Defrosting...
  • Page 22 TROUBLESHOOTING 9-1. TROUBLESHOOTING Present and past check codes are logged, and they can be displayed on the control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summarized in the table below. Check the contents below before investigating details.
  • Page 23 9-2. SELF-DIAGNOSIS ACTION TABLE Note: Refer to indoor unit section for code P, code E, and Code L. Check code Abnormal points and detection method Cause judgment and action 1 No voltage is supplied to terminal 1 Check following items.
  • Page 24 Check code Abnormal points and detection method Cause judgment and action Indoor/outdoor unit connector 1 Contact failure or miswiring of 1 Check disconnection or looseness or polarity miswiring, excessive number of units (2 indoor/outdoor unit connecting wire of indoor/outdoor unit connecting wire of units or more) indoor and outdoor units.
  • Page 25 Check code Abnormal points and detection method Cause judgment and action High pressure (High pressure switch 1 Defective operation of stop 1 Check if stop valve is fully open. 63H operated) valve (Not fully open) 2 Clogged or broken pipe 2 Check piping and repair defect.
  • Page 26 Check code Abnormal points and detection method Cause judgment and action Open/short of outdoor unit thermistors 1 Disconnection or contact failure 1 Check connection of connector (TH3, TH34, (TH3, TH34, TH6, TH7, and TH8) of connectors TH7/6) on the outdoor controller circuit board. Abnormal if open or short is detected during Outdoor controller circuit board: Check connection of connector (CN3) on the...
  • Page 27 Check code Abnormal points and detection method Cause judgment and action To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6. Detailed Refer to "9-7. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS". codes Overvoltage error 1 Abnormal increase in power source 1 Check the field facility for the power sup- voltage...
  • Page 28 Continued from the previous page. Check code Abnormal points and detection method Cause judgment and action PFC error (Overvoltage/ 1 Abnormal increase in power 12 Check the field facility for the power supply. Detailed Undervoltage/Overcurrent) source voltage codes 2 Decrease in power source •...
  • Page 29 Check code Abnormal points and detection method Cause judgment and action Low pressure 1 Leakage or shortage of 1 Check intake superheat. Abnormal if following conditions are refrigerant Check leakage of refrigerant. detected after compressor starts heating Check additional refrigerant. operating for 3 minutes.
  • Page 30 Check code Abnormal points and detection method Cause judgment and action Remote controller control board 1 Defective remote controller 1 Replace remote controller. 1 Abnormal if data cannot be normally read from the nonvolatile memory of the remote controller control board. (Check code: E1) (6201 2 Abnormal if the clock function of remote...
  • Page 31 Check code Abnormal points and detection method Cause judgment and action Pipe temperature 1 Leakage or shortage of 1 Check intake superheat. Abnormal if the following conditions are refrigerant Check leakage of refrigerant. detected for continuously 3 minutes after compressor starts operating for 10 minutes. 2 Malfunction of linear expansion 2 Check linear expansion valve.
  • Page 32 9-3. TROUBLESHOOTING OF PROBLEMS Phenomena Factor Countermeasure 1. Remote controller display does not 1 1 2 V DC is not supplied to remote controller. 1 Check LED2 on indoor controller board. work. (1) When LED2 is lit. Check the remote controller wiring for break- ing or contact failure.
  • Page 33 Phenomena Factor Countermeasure 7. A large amount of water is drained 1 W ater is drained from PRV because of the 1 Check the below items following the indoor unit from the outdoor unit. pressure rise in water circuit. manual to suppress the pressure rise in water circuit.
  • Page 34 Symptoms: “PLEASE WAIT” is kept being displayed on the remote controller. Inspection method and Diagnosis flow Cause troubleshooting Check the display time of “PLEASE WAIT” after turning on the main power. 6 minutes 2 minutes or more or less How long is “PLEASE WAIT” •...
  • Page 35 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller. 1 LED1 : LED2 : LED3 : Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block of the indoor unit which is used to connect the indoor unit and the outdoor unit.
  • Page 36 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller. 2 LED1 : LED2 : LED3 : Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block of the indoor unit which is used to connect the indoor unit and the outdoor unit.
  • Page 37 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller. 3 LED1 : LED2 : LED3 : — Inspection method and Diagnosis flow Cause troubleshooting Check the voltage of the terminal block (TB6) of the remote controller. 10 to 16 V DC? •...
  • Page 38 9-4. HOW TO CHECK THE PARTS PUZ-WM50VHA.UK PUZ-WM60VAA.UK PUZ-WM85VAA.UK PUZ-WM50VHA-BS.UK PUZ-WM60VAA-BS.UK PUZ-WM85VAA-BS.UK PUZ-WM85YAA.UK PUZ-WM112VAA.UK PUZ-WM112YAA.UK PUZ-WM85YAA-BS.UK PUZ-WM112VAA-BS.UK PUZ-WM112YAA-BS.UK Parts name Check points Thermistor (TH3) Disconnect the connector then measure the resistance with a tester. (At the ambient temperature 10 to 30:)
  • Page 39 Check method of DC fan motor (fan motor/outdoor controller circuit board) Notes · High voltage is applied to the connector (CNF1) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1) for the motor with the power supply on. board and fan motor.) (It causes trouble of the outdoor controller circuit Self check...
  • Page 40 Low temperature thermistors • Thermistor (TH3) • Thermistor (TH6) • Thermistor (TH7) • Thermistor (TH34) Thermistor R0 = 15 k" ± 3 % B constant = 3480 ± 2 % =15exp{3480( 273+t – 273 )} 15 k"...
  • Page 41 Linear expansion valve (1) Operation summary of the linear expansion valve • Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board. • Valve position can be changed in proportion to the number of pulse signal. ...
  • Page 42 (3) How to attach and detach the coil of linear expansion valve Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Stopper Coil Lead wire Hold the lower part of the main body (shown as A) firmly so that the main body does not move and detach the coil by pulling it upward.
  • Page 43 9-6. TEST POINT DIAGRAM Outdoor controller circuit board PUZ-WM50VHA.UK PUZ-WM60VAA.UK PUZ-WM85VAA.UK PUZ-WM50VHA-BS.UK PUZ-WM60VAA-BS.UK PUZ-WM85VAA-BS.UK PUZ-WM85YAA.UK PUZ-WM112VAA.UK PUZ-WM112YAA.UK PUZ-WM85YAA-BS.UK PUZ-WM112VAA-BS.UK PUZ-WM112YAA-BS.UK TEST POINT1 is high voltage. CNDM 1–2: Manual defrost, defect Input of low-level sound priority mode Function switch history record reset, CN51 1–3:...
  • Page 44 Outdoor power circuit board Brief Check of POWER MODULE PUZ-WM50VHA.UK If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). PUZ-WM50VHA-BS.UK 1. Check of diode bridge TABP1-TABS, TABN1-TABS, TABP1-TABT, TABN1-TABT 2. Check of DIP-IPM...
  • Page 45 Outdoor noise filter circuit board PUZ-WM85YAA.UK PUZ-WM112YAA.UK PUZ-WM85YAA-BS.UK PUZ-WM112YAA-BS.UK LO1, LO2, LO3 CNAC2 POWER SUPPLY 230 V AC LO1-LO2/LO2-LO3/LO3-LO1 : AC400V OUTPUT (Connect to the outdoor controller (Connect to the outdoor converter circuit board (L1-IN), ACL2, ACL3) circuit board (CNAC)) Connect to the outdoor converter circuit board (N-IN)
  • Page 46 Outdoor power circuit board Brief Check of DIP-IPM and DIODE MODULE If they are short-circuited, it means that they are broken. PUZ-WM60VAA.UK Measure the resistance in the following points (connectors, etc.). PUZ-WM60VAA-BS.UK 1. Check of DIP-IPM PUZ-WM85VAA.UK P2 - U2 , P2 - V2 , P2 - W2 , N2 - U2 , N2 - V2 , N2 - W2 PUZ-WM85VAA-BS.UK P3 - U3 , P3 - V3 , P3 - W3 , N3 - U3 , N3 - V3 , N3 - W3 PUZ-WM112VAA.UK...
  • Page 47 Outdoor power circuit board Brief Check of POWER MODULE • If they are short-circuited, it means that they are broken. PUZ-WM85YAA.UK Measure the resistance in the following points (connectors, etc.). PUZ-WM85YAA-BS.UK 1. Check of DIODE MODULE PUZ-WM112YAA.UK L1 - P1 , L2 - P1 , L3 - P1 , L1 - N1 , L2 - N1 , L3 - N1 PUZ-WM112YAA-BS.UK 2.
  • Page 48 Outdoor converter circuit board PUZ-WM85YAA.UK PUZ-WM112YAA.UK PUZ-WM85YAA-BS.UK PUZ-WM112YAA-BS.UK L1-IN, N-IN L1-A1 CK-OU Connect to the noise filter Connect to the ACL1 Connect to the CK capacitor circuit board (LO1, NO) Connect to the outdoor power circuit board (CN7) L1-A2, L2-A2, L3-A2 L1-OU, L2-OU, L3-OU Connect to the ACL1, ACL2, ACL3 Connect to the outdoor power circuit board...
  • Page 49 9-7. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches PUZ-WM50VHA.UK PUZ-WM60VAA.UK PUZ-WM85VAA.UK PUZ-WM50VHA-BS.UK PUZ-WM60VAA-BS.UK PUZ-WM85VAA-BS.UK PUZ-WM85YAA.UK PUZ-WM112VAA.UK PUZ-WM112YAA.UK PUZ-WM85YAA-BS.UK PUZ-WM112VAA-BS.UK PUZ-WM112YAA-BS.UK Type Action by the switch operation ■ The black square ( ) indicates a switch position. Switch...
  • Page 50 PUZ-WM50VHA.UK PUZ-WM60VAA.UK PUZ-WM85VAA.UK PUZ-WM50VHA-BS.UK PUZ-WM60VAA-BS.UK PUZ-WM85VAA-BS.UK PUZ-WM85YAA.UK PUZ-WM112VAA.UK PUZ-WM112YAA.UK PUZ-WM85YAA-BS.UK PUZ-WM112VAA-BS.UK PUZ-WM112YAA-BS.UK The blinking patterns of both LED1 (green) and LED2 (red) indicate the types of abnormality when it occurs. Types of abnor- mality can be indicated in details by connecting an optional part “A-Control Service Tool (PAC-SK52ST)”...
  • Page 51 Indication Error Outdoor controller board Detailed Check Contents Inspection method reference code* LED1 (Green) LED2 (Red) page 3 blinking 1 blinking 1Check if stop valves are open. Abnormality of discharging 2Check if connectors (TH4, LEV-A, and LEV-B) on outdoor controller temperature (TH4) and Comp.
  • Page 52 [When optional part 'A-Control Service Tool (PAC-SK52ST)' is connected to outdoor controller board (CNM)] Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of check code by control- ling DIP SW2 on “'A-Control Service Tool'”.
  • Page 53 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH3) −40 to 90 −40 to 90 (When the coil thermistor detects 0: or below, “–” and temperature are displayed by turns.) (Example) When −10:;...
  • Page 54 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH3) on error −40 to 90 occurring (When the coil thermistor detects 0: or below, “–” −40 to 90 and temperature are displayed by turns.) (Example) When −15:;...
  • Page 55 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Capacity setting display Displayed as an outdoor capacity code. Capacity Code WM50 Code display WM60 2 3 4 5 6 WM85 WM112 Outdoor unit setting information •...
  • Page 56 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Outdoor heat sink temperature (TH8) −40 to 200 −40 to 200 (When the temperature is 0: or less, “–” and temperature are displayed by turns.) (When the thermistor detects 100: or more, hundreds digit, tens digit and ones digit are 2 3 4 5 6...
  • Page 57 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Error postponement code history (3) Postponement code display of outdoor unit Blinking: During postponement Lighting: Cancellation of postponement Code “00” is displayed in case of no postponement. display 2 3 4 5 6 When no error history, “0”...
  • Page 58 ■ The black square ( ) indicates a switch position. Display detail SW2 setting Explanation for display Unit 2-phase pipe temperature thermistor −40 to 90 (TH6) (When the temperature is 0°C or less, “–” and -40 to 90 temperature are displayed by turns.) (Example) When −15°C;...
  • Page 59 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail Comp. surface temperature (TH33) −52 to 221 −52 to 221 (When the temperature is 0: or less, "–" and tem- perature are displayed by turns.) (When the discharge thermistor detects 100°C or more, hundreds digit, tens digit, and ones digit are displayed by turns.)
  • Page 60 MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER 10-1. Request code list Certain indoor/outdoor combinations do not have the request code function; therefore, no request codes are displayed. Refer to indoor unit service manual for how to use the controllers and request codes for indoor unit. Description Request content Unit...
  • Page 61 Description Request content Unit Remarks (Display range) Outdoor unit-Control state Refer to 10-1-1.Detail Contents in Request Code. – Compressor-Frequency control state Refer to 10-1-1.Detail Contents in Request Code. – Outdoor unit-Fan control state Refer to 10-1-1.Detail Contents in Request Code. –...
  • Page 62 Description Request content Unit Remarks (Display range) Displays error history. 103 Error history 1 (latest) Code (" --" is displayed if no history is present.) Displays error history. 104 Error history 2 (second to last) Code (" --" is displayed if no history is present.) Displays error history.
  • Page 63 10-1-1. Detail Contents in Request Code [Operation state] (Request code :" 0") Relay output state Power currently Data display Display Compressor Four-way valve Solenoid valve supplied to compressor – – – – Relay output state Operation mode Operation mode Display Operation mode STOP •...
  • Page 64 [Actuator output state] (Request code :"54") Data display Actuator output state 1 Actuator output state 2 Actuator output state Actuator output state Compressor is Display Four-way valve Compressor Display warming up [Error content (U9)] (Request code :"55 ") Data display Error content 1 Error content 2 Error content...
  • Page 65 [Outdoor unit – Capacity setting display] (Request code : "70") Data display Capacity [Outdoor unit – Setting information] (Request code : "71") Setting information 1 Data display Display Defrost mode Setting information 1 Standard Setting information 2 For high humidity Setting information 2 Single-/ Heat pump/...
  • Page 66 DISASSEMBLY PROCEDURE PUZ-WM50VHA.UK PUZ-WM50VHA-BS.UK OPERATING PROCEDURE PHOTOS/FIGURES Photo 1 1. Removing the service, top and cover panels Top panel fixing screws Top panel (1) Remove 3 screws (5 × 12) and slide the hook on the right downward to remove the service panel.
  • Page 67 OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 4. Removing the thermistor <2-Phase pipe> (TH6) (1) Remove the service panel. (See Photo 1) 2-Phase pipe (2) Remove the top panel. (See Photo 1) thermistor (TH6) (3) Disconnect the connector TH7/6 on the controller circuit board.
  • Page 68 OPERATING PROCEDURE PHOTOS/FIGURES 8. Removing the 4-way valve coil (21S4) linear expansion Photo 9 valve coil (LEV (A), LEV (B)) 4-way valve Pressure sensor (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box.
  • Page 69 OPERATING PROCEDURE PHOTOS/FIGURES Photo 11 11. Removing the high pressure switch (63H) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the cover panel. (See Photo 1) (4) Remove the stay and the side panel (R). (Refer to Procedure 9) (5) Remove the electrical parts box (Refer to Procedure 3).
  • Page 70 OPERATING PROCEDURE PHOTOS/FIGURES 14. Removing the receiver Photo 14 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the cover panel. (See photo 1) (4) Remove the stay and the side panel (R). (Refer to Procedure 9) (5) Remove the electrical parts box.
  • Page 71 OPERATING PROCEDURE PHOTOS/FIGURES 17. Disassembling the electrical parts box Photo 17 (1) Remove the electrical parts box. (See Photo 3-1) (2) Disconnect all the connectors on the controller circuit board. (3) To remove the controller circuit board, release it from the Power circuit board support.
  • Page 72 PUZ-WM60VAA.UK PUZ-WM85VAA.UK PUZ-WM85YAA.UK PUZ-WM60VAA-BS.UK PUZ-WM85VAA-BS.UK PUZ-WM85YAA-BS.UK OPERATING PROCEDURE PHOTOS/FIGURES Photo 1 1. Removing the service panel and top panel Top panel Top panel fixing screws (1) Remove the service panel fixing screws (3 for front and 1 for right/ 5 × 12), then slide the service panel downward to remove it.
  • Page 73 OPERATING PROCEDURE PHOTOS/FIGURES 4. Disassembling the electrical parts box (V model only) Photo 4-1 Photo 4-2 (1) Remove the electrical parts box. (See Photo 3-1) Cont base front Power circuit board (2) Disconnect all the connectors on the controller circuit board.
  • Page 74 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the thermistor <2-Phase Pipe> (TH6) Photo 6 Thermistor <2-Phase Pipe> (TH6) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Disconnect the connector TH7/6 (RD) on the controller circuit board in the electrical parts box.
  • Page 75 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing the thermistor (TH4) and thermis- Photo 9 tor (TH33) (1) Remove the service panel. (See Photo 1) Thermistor (TH33) (3) Remove the cover panel (front). (See Photo 3-1) (4) Remove the comp case (top).
  • Page 76 OPERATING PROCEDURE PHOTOS/FIGURES 11. Removing the 4-way valve coil (21S4), LEV coil (LEV-A, Photo 11 LEV-B) and lead wire for high pressure switch (1) Remove the electrical parts box. (See Photo 3-1) (2) Loosen the bands for the lead wire. [Removing the 4-way valve coil] (3) Remove the 4-way valve coil fixing screw (1 for front/ M5) 4-way valve coil...
  • Page 77 OPERATING PROCEDURE PHOTOS/FIGURES 13. Removing the compressor (MC) Photo 12 (1) Remove the nozzle of plate heat exchanger for the water piping. (See Photo 14) (2) Remove the service panel. (See Photo 1) (3) Recover refrigerant. (4) Remove the electrical parts box. (See Photo 3-1) (5) Remove the side panel (R).
  • Page 78 OPERATING PROCEDURE PHOTOS/FIGURES Photo 14 15. Removing the plate heat exchanger (1) Remove the nozzle of plate heat exchanger for the water piping. (2) Remove the service panel. (See Photo 1) (3) Remove the refrigerant. (4) Remove the piping. (5) Remove the plate heat exchanger fixing screws (1 for right/ 4 ×...
  • Page 79 PUZ-WM112VAA.UK PUZ-WM112YAA.UK PUZ-WM112VAA-BS.UK PUZ-WM112YAA-BS.UK OPERATING PROCEDURE PHOTOS/FIGURES Top panel 1. Removing the service panel and top panel Photo 1 Top panel fixing screws (1) Remove the service panel fixing screws (3 for front and 1 for right/ 5 × 12), then slide the service panel downward to remove it.
  • Page 80 OPERATING PROCEDURE PHOTOS/FIGURES 4. Disassembling the electrical parts box (V model only) Photo 4-1 Photo 4-2 (1) Remove the electrical parts box. (See Photo 3-1) Cont base front Power circuit board (2) Disconnect all the connectors on the controller circuit board. (3) To remove the controller circuit board, release it from the support.
  • Page 81 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the thermistor <2-Phase Pipe> (TH6) Photo 6 Thermistor <2-Phase Pipe> (TH6) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Disconnect the connector TH7/6 (RD) on the controller circuit board in the electrical parts box.
  • Page 82 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing the thermistor (TH4) and thermistor Photo 9 (TH33) Thermistor (1) Remove the service panel. (See Photo 1) Thermistor (2) Remove the top panel. (See Photo 1) (TH33) (TH4) (3) Remove the cover panel (front). (See Photo 3-1) (4) Remove the comp case (top).
  • Page 83 OPERATING PROCEDURE PHOTOS/FIGURES 11. Removing the 4-way valve coil (21S4), LEV coil (LEV-A, Photo 11 LEV-B), lead wires for high pressure switch (1) Remove the electrical parts box. (See Photo 3-1) (2) Loosen the bands for the lead wire. 4-way valve coil [Removing the 4-way valve coil] 4-way valve fixing screw...
  • Page 84 OPERATING PROCEDURE PHOTOS/FIGURES 13. Removing the compressor (MC) Photo 12 (1) Remove the nozzle of plate heat exchanger for the water piping. (See Photo 14) (2) Remove the service panel. (See Photo 1) (3) Recover refrigerant. (4) Remove the electrical parts box. (See Photo 3-1) (5) Remove the side panel (R).
  • Page 85 OPERATING PROCEDURE PHOTOS/FIGURES 15. Removing the plate heat exchanger Photo 14 (1) Remove the nozzle of plate heat exchanger for the water piping. (2) Remove the service panel. (See Photo 1) (3) Recover refrigerant. (4) Remove the piping. (5) Remove the plate heat exchanger fixing screws (1 for right/ 4 ×...
  • Page 86 HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2020 MITSUBISHI ELECTRIC CORPORATION Published: Mar. 2020 No. OCH727 Specifications are subject to change without notice. Made in Japan...

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