Mitsubishi Electric PUHZ-W85VAA Service Manual
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Mitsubishi Electric PUHZ-W85VAA Service Manual

Air to water heat pump units
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AIR TO WATER HEAT PUMP UNITS
SERVICE MANUAL
[Model Name]
PUHZ-W85VAA
PUHZ-W112VAA
PUHZ-W85YAA
PUHZ-W112YAA
[Service Ref.]
PUHZ-W85VAA.UK
PUHZ-W112VAA.UK
PUHZ-W85YAA.UK
PUHZ-W112YAA.UK
R410A
CONTENTS
1. REFERENCE MANUAL ································ 2
2. SAFETY PRECAUTION ······························· 3
3. SPECIFICATIONS ········································ 5
4. DATA ····························································· 6
5. OUTLINES AND DIMENSIONS···················· 7
6. WIRING DIAGRAM ······································· 8
7. WIRING SPECIFICATIONS ························ 10
8. REFRIGERANT SYSTEM DIAGRAM ········ 11
9. TROUBLESHOOTING ································ 13
11. DISASSEMBLY PROCEDURE ··················· 56
PARTS CATALOG (OCB681)
April 2018
No. OCH681
Note:
• This manual describes
service data of the outdoor
units only.

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Summary of Contents for Mitsubishi Electric PUHZ-W85VAA

  • Page 1: Table Of Contents

    AIR TO WATER HEAT PUMP UNITS April 2018 No. OCH681 SERVICE MANUAL R410A [Model Name] [Service Ref.] PUHZ-W85VAA.UK PUHZ-W85VAA Note: • This manual describes service data of the outdoor PUHZ-W112VAA.UK PUHZ-W112VAA units only. PUHZ-W85YAA.UK PUHZ-W85YAA PUHZ-W112YAA.UK PUHZ-W112YAA CONTENTS 1. REFERENCE MANUAL ································ 2 2.

  • Page 2: Reference Manual

    REFERENCE MANUAL INDOOR UNIT SERVICE MANUAL 1-1. FOR AIR TO WATER SYSTEM Service Model name Service ref. manual No. EHPT20X-VM2HB EHPT20X-VM2HB.UK EHPT20X-VM6HB EHPT20X-VM6HB.UK EHPT20X-YM9HB EHPT20X-YM9HB.UK OCH531 EHPT20X-TM9HB EHPT20X-TM9HB.UK OCB531 EHPT20X-VM6B EHPT20X-VM6B.UK EHPT20X-YM9B EHPT20X-YM9B.UK EHPX-VM2B EHPX-VM2B.UK OCH532 EHPX-VM6B EHPX-VM6B.UK OCB532 EHPX-YM9B EHPX-YM9B.UK EHPX-VM2C EHPX-VM2CR2.UK...

  • Page 3: Safety Precaution

    SAFETY PRECAUTION SAFETY PRECAUTION SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. Preparation before the repair service. • Prepare the proper tools. • Prepare the proper protectors. • Provide adequate ventilation. •...
  • Page 4 [1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them. [2] Additional refrigerant charge When charging directly from cylinder (1) Check that cylinder for R410A on the market is a syphon type.

  • Page 5: Specifications

    SPECIFICATIONS Service Ref. PUHZ-W85VAA.UK PUHZ-W85YAA.UK Power source (Phase, cycle, voltage) Single, 50 Hz, 230 V 3-Phase, 50 Hz, 400 V Max. current 22.0 11.5 External finish Munsell: N8.75 Munsell N2.75 (FRONT PANEL) Refrigerant control Linear Expansion Valve Compressor Hermetic Model...

  • Page 6: Data

    DATA 4-1. COMPRESSOR TECHNICAL DATA (at 20:) Service Ref. PUHZ-W85VAA.UK PUHZ-W85YAA.UK PUHZ-W112VAA.UK PUHZ-W112YAA.UK Compressor model SNB220FEGMC-L1 SNB220FEAMC-L1 DNB28FBAMT DNB28FBBMT 0.95 1.65 0.74 0.94 Winding 0.95 1.65 0.74 0.94 Resistance (Ω) 0.95 1.65 0.74 0.94 4-2. NOISE CRITERION CURVES PUHZ-W85VAA.UK PUHZ-W112VAA.UK PUHZ-W85YAA.UK...

  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PUHZ-W85VAA.UK PUHZ-W112VAA.UK PUHZ-W85YAA.UK PUHZ-W112YAA.UK Unit: mm OCH681...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM PUHZ-W85VAA.UK PUHZ-W112VAA.UK SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply, Indoor/Outdoor> Capacitor CY1, CY2 Motor for Compressor Power Circuit Board P. B. Fan Motor Controller Circuit Board C. B. 21S4 Solenoid Valve (4-Way Valve) Switch <Manual Defrost, Defect History High Pressure Switch Record Reset, Refrigerant Address>...
  • Page 9 PUHZ-W85YAA.UK PUHZ-W112YAA.UK SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply> Power Circuit Board P. B. Terminal Block <Indoor/Outdoor> N. F. Noise Filter Circuit Board Motor for Compressor Converter Circuit Board CONV. B. Fan Motor C. B. Controller Circuit Board Solenoid Valve (4-Way Valve) Switch <Manual Defrost, 21S4 High Pressure Switch...

  • Page 10: Wiring Specifications

    WIRING SPECIFICATIONS FIELD ELECTRICAL WIRING (power wiring specifications) W85V W112V W85Y, W112Y Outdoor unit model ~/N (single), 50 Hz, 230 V ~/N (single), 50 Hz, 230 V 3N~ (3 ph 4-wires), 50 Hz, 400 V Outdoor unit power supply Outdoor unit input capacity Main switch (Breaker) *1 3 ×...

  • Page 11: Refrigerant System Diagram

    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 12 Refrigerant flow in cooling 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) L/P SW Low pressure switch (63L) For protection (OFF: -0.03MPa)

  • Page 13: Troubleshooting

    TROUBLESHOOTING 9-1. TROUBLESHOOTING <Check code displayed by self-diagnosis and actions to be taken for service (summary)> 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 14 9-2. SELF-DIAGNOSIS ACTION TABLE Note: Refer to indoor unit section for code P, code E, and Code L. <Abnormalities detected when the power is turned on> Abnormal point and detection method Judgment and action Check code Cause 1 No voltage is supplied to terminal 1 Check following items.
  • Page 15 Check Code Abnormal point and detection method Cause Judgment and action 2 connector open (W112 only) 1 Check connection of connector (63H,63L) on 1 Disconnection or contact failure Abnormal if both 63H and 63L connector of connector (63H,63L) on outdoor controller circuit board. circuits are open for three minutes outdoor controller circuit board Refer to "9-6.TEST POINT DIAGRAM".
  • Page 16 <Abnormalities detected while unit is operating> Check Code Abnormal point and detection method Judgment and action Cause High pressure (High pressure switch 1 Check if stop valve is fully open. 1 Defective operation of stop 63H operated) valve (Not fully open) 2 Check piping and repair defect.
  • Page 17 Check code Abnormal point and detection method Judgment and action Cause 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 Outdoor controller circuit board: Check connection of connector (CN3) on the...
  • Page 18 Check code Abnormal point and detection method Judgment and action Cause 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 1 Check the field facility for the power Overvoltage error 1 Abnormal increase in power source supply.
  • Page 19 From the previous page. Check code Abnormal point and detection method Judgment and action Cause PFC error (Overvoltage/ 1 Abnormal increase in power 12 Check the field facility for the power supply. Detailed codes Undervoltage/Overcurrent) source voltage 2 Decrease in power source •...
  • Page 20 Abnormal point and detection method Judgment and action Check code Cause 1 Stop valve of outdoor unit is 1 Open stop valve. Compressor overcurrent interruption closed. Abnormal if overcurrent DC bus or 2 Decrease of power supply 2 Check facility of power supply. compressor is detected after compressor voltage starts operating for 30 seconds.
  • Page 21 Check code Abnormal point and detection method Judgment and action Cause Remote controller transmission error (E3)/ signal receiving error (E5) 1 Abnormal if remote controller could not 1 The address changes to a separate setting. find blank of transmission path for 6 1 Duplication of refrigerant seconds and could not transmit.
  • Page 22 Abnormal point and detection method Judgment and action Check code Cause 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 23 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 24 Phenomena Countermeasure ■ These sounds can be heard when refrigerant and/or water is (are) flowing A flowing water sound or occasional hissing sound is heard. in the indoor unit or refrigerant pipe, or when the refrigerant and/or water is (are) chugging. ■...
  • Page 25 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 26 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 27 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 28 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 29 9-4. HOW TO CHECK THE PARTS PUHZ-W85VAA.UK PUHZ-W112VAA.UK PUHZ-W85YAA.UK PUHZ-W112YAA.UK Parts name Check points Thermistor (TH3) Disconnect the connector then measure the resistance with a tester. <Liquid> (At the ambient temperature 10 to 30:) Thermistor (TH4) Normal Abnormal <Discharge> Thermistor (TH6) 160 to 410 k"...
  • Page 30 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 31 <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid> (TH3) • Thermistor <Plate hex liquid> (TH6) • Thermistor <Ambient> (TH7) Thermistor R0 = 15 k" ± 3 % B constant = 3480 ± 2 % =15exp{3480( 273+t – 273 )} 15 k"...
  • Page 32 Low temperature thermistor • Thermistor <Inlet water> (TH34) Thermistor R0 = 15 k" ± 2.5% B constant = 3450 ± 2% =15exp{3450( 273+t – 273 )} 15 k" 4.3 k" 9.6 k" 3.0 k" 6.3 k" 5.2 k" -20 -10 10 20 30 40 50 Temperature(:) OCH681...
  • Page 33 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. <Connection between the outdoor controller board and the linear expansion valve>...
  • Page 34 (3) How to attach and detach the coil of linear expansion valve <Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Stopper Coil Lead wire <How to detach the coil> 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 35 9-6. TEST POINT DIAGRAM Outdoor controller circuit board PUHZ-W85VAA.UK PUHZ-W112VAA.UK PUHZ-W85YAA.UK PUHZ-W112YAA.UK <CAUTION> TEST POINT1 is high voltage. Operation monitor CNDM function 1–2: Manual defrost, detect Input of low-level sound priority mode Demand control setting history record reset, CN51 1–3:...
  • Page 36 Outdoor noise filter circuit board PUHZ-W85YAA.UK PUHZ-W112YAA.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) Connect to the ACL4...
  • Page 37 Outdoor power circuit board Brief Check of DIP-IPM and DIODE MODULE Usually, they are in a state of being short-circuited if they are broken. PUHZ-W85VAA.UK Measure the resistance in the following points (connectors, etc.). If they PUHZ-W112VAA.UK are short-circuited, it means that they are broken.
  • Page 38 Outdoor power circuit board Brief Check of POWER MODULE PUHZ-W85YAA.UK • Usually, they are in a state of being short-circuited if they are broken. PUHZ-W112YAA.UK Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken. 1.
  • Page 39 Outdoor converter circuit board PUHZ-W85YAA.UK PUHZ-W112YAA.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 (TB-L1, L2, L3)
  • Page 40 9-7. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches PUHZ-W85VAA.UK PUHZ-W112VAA.UK PUHZ-W85YAA.UK PUHZ-W112YAA.UK Type Action by the switch operation Function Effective timing Switch switch When compressor is working Manual defrost * Start Normal in heating operation.* Abnormal history clear...
  • Page 41 ■ The black square ( ) indicates a switch position. Action by the switch operation Type of Switch Function Effective timing Switch No function — — — Power failure Auto recovery No auto recovery When power supply ON automatic recovery* 3,4,5,6 No function —...
  • Page 42 <Outdoor unit operation monitor function> Digital indicator LED3 displays 2 digit number or code to inform operation condition and the meaning of check code by control- ling DIP SW2 on “the outdoor controller circuit board”. Operation indicator SW2 : Indicator change of self diagnosis ■...
  • Page 43 ■ 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 44 ■ 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 45 ■ 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 Code display W112 2 3 4 5 6 Outdoor unit setting information •...
  • Page 46 ■ 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 47 ■ 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 Error history (3) (Oldest)
  • Page 48 ■ The black square ( ) indicates a switch position. Display detail SW2 setting Explanation for display Unit Water inlet temperature (TH34) when 0 to 100 error occurred. 0 to 100 2 3 4 5 6 Outdoor outside temperature (TH7) on −40 to 90 error occurring (When the temperature is 0°C or less, “–”...
  • Page 49 ■ 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 50: Monitoring The Operation Data By The Remote Controller

    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 51 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 52 Description Request content Unit Remarks (Display range) Error history 1 (latest) Displays error history. (" --" is displayed if no history is present.) Code Error history 2 (second to last) Displays error history. (" --" is displayed if no history is present.) Code Error history 3 (third to last) Displays error history.
  • Page 53 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 54 [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 55 [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 56: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUHZ-W85VAA.UK PUHZ-W85YAA.UK OPERATING PROCEDURE PHOTOS/FIGURES Photo 1 Top panel 1. Removing the service panel and 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 57 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 58 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the thermistor <Plate Hex Liquid> (TH6) Photo 6 (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. (See Photo 3-1) (4) Loosen the clamps, fasteners, wire clips and cable straps for the lead wires in the electrical parts box.
  • Page 59 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing the thermistor <Discharge> (TH4) and thermis- Photo 9 tor <Comp. Surface> (TH33) (1) Remove the service panel. (See Photo 1) Thermistor <Comp. (2) Remove the top panel. (See Photo 1) Surface> (TH33) (3) Remove the cover panel (front). (See Photo 3-1) (4) Remove the comp case (top).
  • Page 60 OPERATING PROCEDURE PHOTOS/FIGURES 11. Removing the 4-way valve coil (21S4), LEV coil (LEV-A, LEV-B) Photo 11 and lead wire for high pressure switch and high pressure sensor (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 61 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 62 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 63 PUHZ-W112VAA.UK PUHZ-W112YAA.UK OPERATING PROCEDURE PHOTOS/FIGURES Top panel fixing screws Photo 1 1. Removing the service panel and top panel Top panel (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 64 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) (2) Disconnect all the connectors on the controller circuit board. Cont base front Power circuit board (3) To remove the controller circuit board, release it from the support.
  • Page 65 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the thermistor <Plate Hex Liquid> (TH6) Photo 6 (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. (See Photo 3-1) (4) Loosen the clamps, fasteners, wire clips and cable straps for the lead wires in the electrical parts box.
  • Page 66 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing the thermistor <Discharge> (TH4) and thermistor Photo 9 <Comp. Surface> (TH33) (1) Remove the service panel. (See Photo 1) Thermistor Thermistor (2) Remove the top panel. (See Photo 1) <Discharge> (TH4) <Comp.Surface> (3) Remove the cover panel (front). (See Photo 3-1) (TH33) (4) Remove the comp case (top).
  • Page 67 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, low pressure switch, and high pressure sensor (1) Remove the electrical parts box. (See Photo 3-1) 4-way valve coil (2) Loosen the bands for the lead wire.
  • Page 68 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 69 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 70 HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2018 MITSUBISHI ELECTRIC CORPORATION Published: Apr. 2018 No.OCH681 Made in Japan Specifications are subject to change without notice.
  • Page 71 Ecodan Homeowner Brochure Ecodan PUHZ Monobloc Air Source Heat Pump Product Information Sheet Ecodan PUHZ-W85-112VAA Monobloc Air Source Heat Pump Product Information Sheet PUHZ-W85-112VAA(-BS) Installation Manual (BH79D674K01) PUHZ-W85-112VAA(-BS) Parts List (OCB681) PUHZ-W85-112VAA(-BS) Service Manual (OCH681) PUHZ-W85VAA(-BS) Declaration of Conformity (CE2018C03)

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