Mitsubishi Electric PUHZ-W112VHA Service Manual
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Mitsubishi Electric PUHZ-W112VHA Service Manual

Air to water heat pump
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AIR TO WATER HEAT PUMP
SERVICE MANUAL
Outdoor unit
[Model Name]
[Service Ref.]
PUHZ-W112VHA
Salt proof model
PUHZ-W112VHA-BS
R410A
Revision:
• Added
• Some descriptions have been
• OCH562 REVISED EDITION-C
Note:
• This manual describes service
CONTENTS
TECHNICAL CHANGES ...................................... 2
1. SAFETY PRECAUTION ................................... 3
2. SPECIFICATIONS ............................................ 6
3. DATA ............................................................... 9
4. OUTLINES AND DIMENSIONS ...................... 11
5. WIRING DIAGRAM ........................................ 12
6. WIRING SPECIFICATIONS ........................... 14
8. TROUBLESHOOTING ................................... 16
9. DISASSEMBLY PROCEDURE ...................... 52
PARTS CATALOG (OCB562)
April 2019
No. OCH562
REVISED EDITION-D
PUHZ-W112VHAR3
and PUHZ-W112VHAR3-BS
in REVISED EDITION-D.
modified.
is void.
data of outdoor unit only.

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  • Page 1: Table Of Contents

    No. OCH562 REVISED EDITION-D SERVICE MANUAL R410A Outdoor unit Revision: [Model Name] [Service Ref.] PUHZ-W112VHAR3 • Added and PUHZ-W112VHAR3-BS PUHZ-W112VHA PUHZ-W112VHA in REVISED EDITION-D. • Some descriptions have been PUHZ-W112VHAR1 modified. • OCH562 REVISED EDITION-C PUHZ-W112VHAR2 is void. PUHZ-W112VHAR3 Note: •...

  • Page 2: Puhz-W112Vha

    PUHZ-W112VHAR2-BS 1. Compressor oil has been added. 2. The installation direction of LEV-B assy has been changed to reduce high frequency noise. 3. Outdoor controller board has been changed. PUHZ-W112VHA PUHZ-W112VHAR1 PUHZ-W112VHA-BS PUHZ-W112VHAR1-BS 1. A compliance with ErP directive Lot 1 has been authorized.

  • Page 3: Safety Precaution

    SAFETY PRECAUTION 1-1. 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. • After stopping the operation of the air conditioner, turn off the power-supply breaker. •...
  • Page 4 [1] Cautions for service (1) Perform service after recovering the refrigerant left in the unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. [2] Additional refrigerant charge When charging directly from cylinder ·...
  • Page 5 1-3. CAUTIONS FOR REFRIGERANT PIPING WORK Tools for R410A (The following table shows whether conventional tools can be used or not.) Can R22 tools be Tools and materials R410A tools Can R407C tools be used? used? × × Gauge manifold Tool exclusive for R410A Air purge, refrigerant charge and operation check...

  • Page 6: Specifications

    SPECIFICATIONS 2-1. SPECIFICATIONS PUHZ-W112VHA PUHZ-W112VHAR1 PUHZ-W112VHAR2 PUHZ-W112VHA-BS PUHZ-W112VHAR1-BS PUHZ-W112VHAR2-BS 1ø , 230 V, 50 Hz 32.1 Nominal water flow rate (Heating mode) L/min Heating(A7/W35) 11.20 Heating y t i ℃ (A7/W35) 4.47 ℃ 2.51 l n i ℃ 11.20 Heating...
  • Page 7 PUHZ-W112VHAR3 PUHZ-W112VHAR3-BS 1ø , 230 V, 50 Hz Nominal water flow rate (Heating mode) L/min 32.1 Heating(A7/W35) Heating y t i 11.20 ℃ 4.47 (A7/W35) ℃ 2.51 l n i ℃ 11.20 Heating y t i Heating(A2/W35) (A2/W35) 3.34 ℃ 3.35 ℃...
  • Page 8 2-2. AVAILABLE RANGE (WATER FLOW RATE, RETURN WATER TEMP.) Note: If using the unit out of the available range, the parts of unit might be damaged. <Heating> <Applicable Model> • PUHZ-W112VHA 25.0 • PUHZ-W112VHA-BS 23.0 Available range • PUHZ-W112VHAR1 21.0 19.0...

  • Page 9: Data

    DATA 3-1. NOISE CRITERION CURVES PUHZ-W112VHA PUHZ-W112VHA-BS PUHZ-W112VHAR1 PUHZ-W112VHAR1-BS PUHZ-W112VHAR2 PUHZ-W112VHAR2-BS PUHZ-W112VHAR3 SPL(dB) MODE LINE COOLING PUHZ-W112VHAR3-BS HEATING NC-70 NC-60 MICROPHONE NC-50 UNIT NC-40 NC-30 1.5m APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz...
  • Page 10 3-2. STANDARD OPERATION DATA Mode Cooling (A35/W7) Heating (A7/W35) Capacity 10,000 11,200 Input 3.57 2.51 Outdoor unit PUHZ-W112VHA Phase, Hz 1, 50 Voltage Current 15.8 11.1 Discharge pressure 2.63 2.08 Suction pressure 0.83 0.67 Discharge temperature ºC Condensing temperature ºC Suction temperature ºC...

  • Page 11: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PUHZ-W112VHA PUHZ-W112VHAR2 PUHZ-W112VHA-BS PUHZ-W112VHAR2-BS PUHZ-W112VHAR1 PUHZ-W112VHAR3 PUHZ-W112VHAR1-BS PUHZ-W112VHAR3-BS Unit: mm OCH562D...

  • Page 12: Wiring Diagram

    WIRING DIAGRAM PUHZ-W112VHA PUHZ-W112VHA-BS 1 MODEL SELECT SYMBOL NAME SYMBOL NAME The black square ( )indicates a switch position. Terminal Block <Power Supply, Indoor/Outdoor> Connection Terminal < N-Phase > MODEL SW5-6 Motor for Compressor Connection Terminal < Reactor > DCL1, DCL2...
  • Page 13 PUHZ-W112VHAR1 PUHZ-W112VHAR2 PUHZ-W112VHAR3 PUHZ-W112VHAR1-BS PUHZ-W112VHAR2-BS PUHZ-W112VHAR3-BS SYMBOL NAME SYMBOL NAME 1 MODEL SELECT Terminal Block<Power Supply, Indoor/Outdoor> CY1, CY2 Capacitor The black square( )indicates a switch position. Motor for Compressor P. B. Power Circuit Board MODEL SW5-6 MF1, MF2 Fan Motor Controller Circuit Board C.

  • Page 14: Wiring Specifications

    WIRING SPECIFICATIONS FIELD ELECTRICAL WIRING (power wiring specifications) t i n 112V Outdoor unit power supply ~/N (single), 50 Hz, 230 V t i n c r i t i u y t i t i n × Interface unit/Flow temp. controller-Outdoor unit 3 ×...

  • Page 15: Refrigerant System Diagram

    Refrigerant flow in cooling Refrigerant flow in heating Symbol Part 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 16: Troubleshooting

    TROUBLESHOOTING 8-1. 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 wired remote controller and control board of out- door unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa- rized in the table below.
  • Page 17 8-3. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> Check Code Abnormal point and detection method Cause Judgment and action 1 No voltage is supplied to 1 Check following items. terminal block (TB1) of a) Power supply breaker outdoor unit.
  • Page 18 Check Code Abnormal point and detection method Cause Judgment and action Miswiring of Interface unit/Flow temp. 1 Contact failure or miswiring 1 Check disconnection or looseness or polar- controller-outdoor unit connecting wire of Interface unit/Flow temp. ity of Interface unit/Flow temp. controller- 1.
  • Page 19 <Abnormalities detected while unit is operating> Check Code Abnormal point and detection method Cause Judgment and action High pressure (High pressure switch 1 Decreased water flow 1–5 Check water circuit and repair the defect. 63H operated) 2 Clogged filter of water pipe Abnormal if high pressure switch 63H 3 Dirt of plate heat exchanger operated ( * ) during compressor opera-...
  • Page 20 Check Code Abnormal point and detection method Cause Judgment and action Open/short of outdoor unit thermistors 1 Disconnection or contact fail- 1 Check connection of connector (TH3, TH32, (TH3, TH32, TH33, TH6, TH7, and TH8) TH33, TH6/TH7) on the outdoor controller circuit ure of connectors Abnormal if open or short is detected Outdoor controller circuit board:...
  • Page 21 Check Code Abnormal point and detection method Cause Judgment and action To find out the details about U9 error, turn ON SW2-1, 2-2, 2-3, 2-4, 2-5 and 2-6 when U9 error occurs. Detailed To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6. codes Refer to "8-7.OUTDOOR UNIT OPERATION MONITOR FUNCTION".
  • Page 22 Check Code Abnormal point and detection method Cause Judgment and action Overheat protection 1 Defective outdoor fan (fan 1 Check outdoor unit air passage. Abnormal if outdoor pipe thermistor (TH3) motor) or short cycle of out- detects 70: or more or condensing door unit during cooling opera- temperature of pressure sensor (63HS) tion...
  • Page 23 Check Code Abnormal point and detection method Cause Judgment and action Remote controller transmission error 1 Contact failure at transmission 1 Check disconnection or looseness of (E0)/signal receiving error (E4) wire of remote controller Interface unit/Flow temp. controller unit or 1 Abnormal if main or sub remote transmission wire of remote controller.
  • Page 24 Check Code Abnormal point and detection method Cause Judgment and action Interface unit/Flow temp. controller- 1 Interface unit/Flow temp. 1 Check disconnection or looseness of outdoor unit communication error controller-outdoor unit connecting Interface unit/Flow temp. controller-outdoor (Transmitting error) (Outdoor unit) wire has contact failure.
  • Page 25 Check Code Abnormal point 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 min- 2 Malfunction of linear expansion 2 Check linear expansion valve.
  • Page 26 8-4. HOW TO CHECK THE PARTS PUHZ-W112VHA PUHZ-W112VHAR2 PUHZ-W112VHA-BS PUHZ-W112VHAR2-BS PUHZ-W112VHAR1 PUHZ-W112VHAR3 PUHZ-W112VHAR1-BS PUHZ-W112VHAR3-BS Checkpoints Parts name Thermistor (TH3) <Liquid> Disconnect the connector then measure the resistance with a tester. Thermistor (TH4) <Discharge> (At the ambient temperature of 10 to 30°C) Thermistor (TH6) <Plate Hex liquid>...
  • Page 27 Check method of DC fan motor (fan motor/outdoor multi controller circuit board) 1 Notes · High voltage is applied to the connector (CNF1, 2) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1, 2) for the motor with the power supply on. (It may damage the outdoor controller circuit board and fan motor.) 2 Self check Symptom: The outdoor fan cannot rotate.
  • Page 28 8-5. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid> (TH3) • Thermistor <Plate HEX liquid> (TH6) • Thermistor <Ambient> (TH7) • Thermistor <Suction> (TH33) Thermistor R0 = 15 kΩ ± 3% B constant = 3480 ± 2% =15exp{3480( 273+t –...
  • Page 29 Low temperature thermistor • Thermistor <Inlet water> (TH32) Thermistor R0 = 15 kΩ ± 2.5% B constant = 3450 ± 2% =15exp{3450( 273+t – 273 )} 15 kΩ 4.3 kΩ 9.6 kΩ 3.0 kΩ 6.3 kΩ 5.2 kΩ –20 –10 0 10 20 30 40 50 Temperature(:) <HIGH PRESSURE SENSOR>...
  • Page 30 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 31 (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 32 <CAUTION> TEST POINT 1 is high voltage. 8-6. TEST POINT DIAGRAM Outdoor controller circuit board PUHZ-W112VHA PUHZ-W112VHA-BS Manual defrost, detect Function switch Operation monitor history record reset function Function switch CNDM 1 to 2: Input of low-level sound priority mode...
  • Page 33 <CAUTION> TEST POINT 1 is high voltage. Outdoor controller circuit board PUHZ-W112VHAR1 PUHZ-W112VHAR2 PUHZ-W112VHAR3 PUHZ-W112VHAR1-BS PUHZ-W112VHAR2-BS PUHZ-W112VHAR3-BS CNDM 21S4 Manual defrost, detect 1 to 2: Function switch Operation monitor 4-way valve history record reset Input of low-level function sound priority mode Function switch CN52C Model select...
  • Page 34 Outdoor power circuit board Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. PUHZ-W112VHA Measure the resistance in the following points (connectors, etc.). PUHZ-W112VHA-BS 1. Check of POWER MODULE 1 Check of DIODE circuit...
  • Page 35 Outdoor power circuit board Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. PUHZ-W112VHAR1 Measure the resistance in the following points (connectors, etc.). PUHZ-W112VHAR1-BS 1. Check of POWER MODULE PUHZ-W112VHAR2 1 Check of DIODE circuit PUHZ-W112VHAR2-BS R - L1 , S - L1 , R - N1 , S - N1 PUHZ-W112VHAR3...
  • Page 36 8-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION Operation indicator SW2: Indicator change of self-diagnosis ■ The black square ( ) indicates a switch position. Display detail Explanation for display Unit SW2 setting 2 3 4 5 6 <Digital indicator LED3 working details> (Be sure that the 1 to 6 in the SW2 are set to OFF.) 1 second (1) Display when the power supply is ON.
  • Page 37 ■ 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 38 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH3) when −40 to 90 error occurred (When the coil thermistor detects 0: or below, “–” −40 to 90 and temperature are displayed by turns.) (Example) When - 15:;...
  • Page 39 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Outdoor unit setting information • The tens digit (Total display for applied setting) Setting details Display details H·P / Cooling only 0: H·P 1: Cooling only Single phase / 3 phase 0: Single phase 2: 3 phase...
  • Page 40 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Number of defrost cycles 0 to FFFE (in hexadecimal notation) 0 to FFFE (When more than FF in hex (255 in decimal), the number is displayed in order of 16 's and 16 's, and...
  • Page 41 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit When no error history, “0” and “– –“ are displayed by Error history (3) (Oldest) turns. Faulty unit number and check code are displayed alternately.
  • Page 42 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail −40 to 200 Outdoor heat sink temperature (TH8) when error occurred. (When the temperature is 0°C or less, “–” and −40 to 200 temperature are displayed by turns.) (When the temperature is 100°C or more, hundreds 2 3 4 5 6...
  • Page 43 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 3 to 217 Comp. surface temperature (TH34) (When the temperature is 100: or more, the 3 to 217 hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 130:;...
  • Page 44 8-8. 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 Remarks (Display range)
  • Page 45 Description Request content Unit Remarks (Display range) Outdoor unit-Control state – Refer to 8-8-1.Detail Contents in Request Code. Compressor-Frequency control state Refer to 8-8-1.Detail Contents in Request Code. – Outdoor unit-Fan control state Refer to 8-8-1.Detail Contents in Request Code. –...
  • Page 46 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 47 8-8-1. 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 48 [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...
  • Page 49 [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/ Display cooling only 3-phase Heat pump Single-phase Cooling only Heat pump 3-phase Cooling only...
  • Page 50 OCH562D...
  • Page 51 – <Important Note> All these DIP switches on PUHZ-W112VHA are set as shown above. Spare PCBs, however, will be supplied without any settings, which means that all DIP switches are switched OFF. When servicing, please make sure to set all switches correctly, referring to the previous PCB which is removed from the unit.

  • Page 52: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUHZ-W112VHA PUHZ-W112VHAR2 PUHZ-W112VHA-BS PUHZ-W112VHAR2-BS PUHZ-W112VHAR1 PUHZ-W112VHAR3 PUHZ-W112VHAR1-BS PUHZ-W112VHAR3-BS : Indicates the visible parts in the photos/fi gures. OPERATING PROCEDURE PHOTOS/FIGURES Top panel fi xing screws Top panel fi xing screws Top panel fi xing screws Top panel fi xing screws 1.
  • Page 53 OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 4. Removing the thermistor <Plate HEX liquid> (TH6) and thermistor <Ambient> (TH7) Thermistor <Plate HEX liquid> (TH6) (1) Remove the service panel. (See Photo 1) 4-way valve (2) Remove the top panel. (See Photo 1) (3) Disconnect the connectors, TH7/6 (red) on the controller circuit board in the electrical parts box.
  • Page 54 OPERATING PROCEDURE PHOTOS/FIGURES Photo 9 7. Removing the 4-way valve coil (21S4), and linear expan- High pressure switch (63H) sion valve coil (LEV-A, LEV-B) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) [Removing the 4-way valve coil] (See Photo 9) (3) Remove 4-way valve coil fixing screw (M4 ×...
  • Page 55 OPERATING PROCEDURE PHOTOS/FIGURES Photo 12 11. Removing high pressure sensor (63HS) Low pressure switch (63L) Low pressure switch (63L) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) (4) Recover refrigerant.
  • Page 56 (10) Remove 2 receiver leg fixing screws (4 × 10). Note: Recover refrigerant without spreading it in the air. HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Issued: Apr. 2019 No. OCH562 REVISED EDITION-D Issued: Dec. 2017 No. OCH562 REVISED EDITION-C Issued: Jul.
  • Page 57 Ecodan Homeowner Leaflet Ecodan Hybrid Applications Brochure Ecodan PUHZ-(H)W Installation Manual (BH79D532H03) Ecodan PUHZ-(H)W50-140VHA(2)/YHA2 Monobloc Air Source Heat Pump Product Information Sheet Ecodan PUHZ-W112VHA Declaration of Conformity Ecodan PUHZ-W112VHA-BS Parts Catalogue (OCB562C) Ecodan PUHZ-W112VHA-BS Service Manual (OCH562D) Ecodan FTC5 Databook (M-P0729)

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