Mitsubishi Electric PUHZ-W85VHA2 Service Manual
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Mitsubishi Electric PUHZ-W85VHA2 Service Manual

Air to water heat pump
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AIR TO WATER HEAT PUMP

SERVICE MANUAL

R410A
[Model name]
PUHZ-W85VHA2
PUHZ-W85VHA2-BS
PUHZ-W85VHA2.UK
PUHZ-W85VHA2-BS.UK
[Service Ref.]
PUHZ-W85VHA2.UK
PUHZ-W85VHA2-BS.UK
Note:
• This manual describes only
service data of outdoor unit.
• RoHS compliant products have
mark on the spec name plate.
CONTENTS
1. SAFETY PRECAUTION ........................................... 2
2. SPECIFICATIONS ...................................................... 5
3. DATA .............................................................................. 7
4. OUTLINES AND DIMENSIONS ............................ 9
5. WIRING DIAGRAM .................................................. 10
6. WIRING SPECIFICATIONS .................................. 11
7. REFRIGERANT SYSTEM DIAGRAM .................... 12
8. TROUBLESHOOTING ............................................ 13
9. DISASSEMBLY PROCEDURE ............................ 42
PARTS CATALOG (OCB465)
August 2009
No. OCH465
Table of Contents
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Summary of Contents for Mitsubishi Electric PUHZ-W85VHA2

  • Page 1: Table Of Contents

    R410A Note: • This manual describes only [Model name] [Service Ref.] service data of outdoor unit. • RoHS compliant products have PUHZ-W85VHA2 PUHZ-W85VHA2.UK mark on the spec name plate. PUHZ-W85VHA2-BS.UK PUHZ-W85VHA2-BS CONTENTS 1. SAFETY PRECAUTION ........... 2 2. SPECIFICATIONS ............5 3.

  • Page 2: Safety Precaution

    SAFETY PRECAUTION 1-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. 1-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Do not use refrigerant other than R410A. If other refrigerant (R22 etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil etc. Use a vacuum pump with a reverse flow check valve.
  • Page 3 [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. [2] Additional refrigerant charge When charging directly from cylinder ·...
  • Page 4 1-3. CAUTIONS FOR REFRIGERANT PIPING WORK Tools for R410A (The following table shows whether conventional tools can be used or not.) Tools and materials R410A tools Can R22 tools be used? Can R407C tools be used? Gauge manifold Air purge, refrigerant charge Tool exclusive for R410A Charge hose and operation check...

  • Page 5: Specifications

    SPECIFICATIONS 2-1. SPECIFICATIONS PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK 1 , 230V, 50Hz Nominal water flow rate (Heating mode) L/min 25.8 Heating(A7/W35) y t i (Min.2.70 ) 9.00 Heating 4.18 (A7/W35) 2.15 l n i (Min.2.60 ) 8.50 y t i Heating Heating(A2/W35) 3.17 (A2/W35) 2.68...
  • Page 6 2-2. AVAILABLE RANGE (WATER FLOW RATE, RETURN WATER TEMP.) 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. •PUHZ-W85VHA2(-BS) 19.0 Available range 17.0 15.0 13.0...

  • Page 7: Data

    DATA 3-1. NOISE CRITERION CURVES MICROPHONE UNIT 1.5m GROUND SPL(dB) MODE LINE PUHZ-W85VHA2(-BS).UK COOLING HEATING NC-70 NC-60 NC-50 NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz...

  • Page 8: The Unit Of Pressure Has Been Changed To Mpa Based On International Si System

    3-2. STANDARD OPERATION DATA Cooling Heating Mode (A35/W7) (A7/W35) Capacity 7,500 9,000 Input 3.04 2.15 Outdoor unit PUHZ-W85VHA2 Phase, Hz 1, 50 Voltage Current 13.15 9.38 Discharge pressure 2.81 2.16 Suction pressure 0.73 0.64 Discharge temperature ºC Condensing temperature ºC Suction temperature ºC...

  • Page 9: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm PUHZ-W85VHA2(-BS).UK...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK SYMBOL NAME SYMBOL NAME Terminal Block Flow temp. controller> TABN1/N2 Connection Terminal < DC Voltage> Motor for Compressor DS2, DS3 Diode bridge Fan Motor Power Module 21S4 Solenoid Valve ...

  • Page 11: Wiring Specifications

    WIRING SPECIFICATIONS FIELD ELECTRICAL WIRING (power wiring specifications) t i n 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 3 × Min. 4 3 ×...

  • Page 12: Refrigerant System Diagram

    Refrigerant flow in heating 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) Plate HEX Plate Heat Exchanger ACH30 - 50 Plates (Alfa Laval)

  • Page 13: Troubleshooting

    TROUBLESHOOTING 8-1. TROUBLESHOOTING Present and past error codes are logged and displayed on the control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring at service, are summarized in the table below. Check the contents below before investigating details.
  • Page 14 8-3. SELF-DIAGNOSIS ACTION TABLE Abnormal point and detection method Judgment and action Error Code Case 1 No voltage is supplied to termi- 1 Check following items. nal block (TB1) of outdoor unit. a) Power supply breaker a) Power supply breaker is turned off.
  • Page 15 Abnormal point and detection method Case Judgment and action Error Code Check disconnection or looseness or polarity Miswiring of Interface unit/Flow temp. Contact failure or miswiring of of Interface unit/Flow temp. controller-outdoor controller-outdoor unit connecting wire Interface unit/Flow temp. controller- unit connecting wire of Interface unit/Flow 1.
  • Page 16 Abnormal point and detection method Judgment and action Error Code Case 1 Decreased water flow 1~5 Check water circuit and repair the defect. High pressure (High-pressure switch 2 Clogged filter of water pipe 63H activated) 3 Dirt of plate heat exchanger Abnormal if high-pressure switch 63H is activated ( w ) during compressor opera-...

  • Page 17: Cooling

    Abnormal point and detection method Judgment and action Error Code Case 1 Disconnection or contact failure Open/short of outdoor unit thermistors 1 Check connection of connector (TH3, TH32, (TH3, TH32, TH6, TH7, and TH8) of connectors TH6/TH7) on the outdoor controller circuit board. Abnormal if open or short is detected Check connection of connector (CN3) on the Outdoor controller circuit...
  • Page 18 Abnormal point and detection method Case Judgment and action Error Code 1 Failure in the operation of 1 Check or replace the DC fan motor. Outdoor fan motor Abnormal if rotational frequency of the fan the DC fan motor motor is not detected during DC fan motor 2 Failure in the outdoor circuit 2 Check the voltage of the outdoor circuit operation.
  • Page 19 Abnormal point and detection method Judgment and action Error Code Case Current sensor error or input current error 1 Disconnection of compressor 1 Correct the wiring (U W phase) to com- • • ·Abnormal if current sensor detects –1.0 A wiring pressor.
  • Page 20 Abnormal point and detection method Judgment and action Error Code Case Remote controller transmission error 1 2 remote controllers are set as 1 Set a remote controller to main, and the (E3)/signal receiving error (E5) 1 Abnormal if remote controller could not find “main.”...

  • Page 21: Heating

    Abnormal point and detection method Judgment and action Error Code Case Freezing/overheating protection is working (1) Freezing protection (1) Freezing protection (1) Freezing protection 1 Reduced water flow 12 Check water piping. · Clogged filter Abnormal if plate heat exchanger pipe ·...
  • Page 22 Check leakage of refrigerant. During compressor operation TH32 < 0: Thermistor TH32: Inlet water temperature 8-4. HOW TO CHECK THE PARTS PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK Parts name Check points TH3: Liquid pipe Disconnect the connector then measure the resistance with a tester.
  • Page 23 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) of the motor with the power supply on. board and fan motor.) (It may damage the outdoor controller circuit Self check...
  • Page 24 8-5. HOW TO CHECK THE COMPONENTS Low temperature thermistors • Thermistor (TH3) • Thermistor (TH6) • Thermistor (TH7) Thermistor R0 = 15k' ± 3% B constant = 3480 ± 2% =15exp{3480( 273+t –...
  • Page 25 Low temperature thermistor • Thermistor (TH32) Thermistor R0 = 15k' ± 2.5% B constant = 3450 ± 2% =15exp{3450( 273+t – 273 )} 15k' 4.3k' 9.6k' 3.0k' 6.3k' 5.2k' -20 -10 10 20 30 40 50 Temperature( ) ...
  • Page 26 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 27 (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 28 8-6. TEST POINT DIAGRAM TEST POINT 1 is high voltage. Outdoor controller circuit board PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK (TEST POINT 1) (TEST POINT 2) (voltage between pins of C5E) S1-S2: 220-240 V AC (voltage between pins of C6B): DC 15 V...
  • Page 29 Outdoor noise filter circuit board LO, NO PUHZ-W85VHA2.UK Voltage of 220-240 V AC is output. Connect to the outdoor power PUHZ-W85VHA2-BS.UK circuit board (TABS, TABT). CNAC1, CNAC2 Connect to the 220-240 V AC earth. Connect to the out- door controller cir- cuit board (CNAC).
  • Page 30 Outdoor power circuit board Brief Check of POWER MODULE PUHZ-W85VHA2.UK w Usually, they are in a state of being short-circuited if they are broken. PUHZ-W85VHA2-BS.UK Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken.
  • Page 31 Active filter module PUHZ-W85VHA2.UK Connect to the outdoor power PUHZ-W85VHA2-BS.UK circuit board (TABP2) L1, L2 Connect to the Non-connect DCL (Reactor) Upper Lower side side Non-connect Connect to the outdoor power circuit board (TABP1) Connect to the outdoor power circuit board (CNAF) –...
  • Page 32 8-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION Operation indicator SW2: Indicator change of self diagnosis Display detail Explanation for display Unit SW2 setting 2 3 4 5 6 (Be sure that the 1 to 6 in the SW2 are set to OFF.) (1) Display when the power supply is ON.
  • Page 33 SW2 setting Display detail Explanation for display Unit Pipe temperature / Liquid (TH3) – 40~90 – 40~90 (When the coil thermistor detects 0: or below, “–” and temperature are displayed by turns.) (Example) When -10:; 2 3 4 5 6 0.5 secs.
  • Page 34 SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH3) when – 40~90 error occurred. (When the coil thermistor detects 0: or below, “–” – 40~90 and temperature are displayed by turns.) (Example) When –15:; 0.5 secs. 0.5 secs. 2 secs. 2 3 4 5 6 Discharge temperature (TH4) when error 3~217...
  • Page 35 SW2 setting Display detail Explanation for display Unit • The tens digit (Total display for applied setting) Outdoor unit setting information Setting details Display details H·P / Cooling only 0 : H·P 1 : Cooling only Single phase / 3 phase 0 : Single phase 2 : 3 phase Code •...
  • Page 36 SW2 setting Display detail Explanation for display Unit 0~130 Sub cool (SC) (When the SC is 100°C or more, hundreds digit, tens 0~130 digit and ones digit are displayed by turns.) °C Cooling: SC = T -TH3 63HS 2 3 4 5 6 Heating: SC = T -TH6 63HS...
  • Page 37 SW2 setting Display detail Explanation for display Unit When no error history, “0” and “– –“ are displayed by Error code history (3) (Oldest) Faulty unit number and error code are turns. displayed alternately. Code display 2 3 4 5 6 Error thermistor display 3: Liquid pipe thermistor (TH3) 3: Water inlet temp.
  • Page 38 SW2 setting Display detail Explanation for display Unit Outdoor heatsink temperature (TH8) -40~200 when error occurred. (When the temperature is 0°C or less, “–” and temperature are displayed by turns.) -40~200 (When the temperature is 100°C or more, hundreds 2 3 4 5 6 digit, tens digit and ones digit are displayed by turns.) Discharge superheat (SHd) when error...
  • Page 39 SW2 setting Display detail Explanation for display Unit 3~217 Comp. shell temperature (TH33) 3~217 (When the temperature is 100: or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 130:; 2 3 4 5 6 0.5 secs.
  • Page 41 All these dip switches on PUHZ-W85VHA2 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 42: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUHZ-W85VHA2.UK PUHZ-W85VHA2-BS.UK OPERATING PROCEDURE PHOTOS & ILLUSTRATION Top panel fixing screws 1. Removing the service panel and top panel Photo 1 Top panel (1) Remove 3 screws (5 × 10) and slide the hook on the right downward to remove the service panel.

  • Page 43: Operating Procedure

    OPERATING PROCEDURE PHOTOS & ILLUSTRATION 4. Removing the thermistor (TH6) Photo 5 (1) Remove the service panel. (See Photo 1.) (2) Remove the top panel. (See Photo 1.) (3) Disconnect the connector TH7/6 (red) on the controller Plate HEX liquid Outdoor liquid circuit board.
  • Page 44 PHOTOS & ILLUSTRATION OPERATING PROCEDURE 8. Removing the solenoid valve coil <4-way valve> (21S4) Photo 9 linear expansion valve coil (LEV (A), LEV (B)) and solenoid valve coil (SV) 4-way 4-way valve LEV-A (1) Remove the service panel. (See Photo 1.) valve coil (21S4) (2) Remove the top panel.
  • Page 45 OPERATING PROCEDURE PHOTOS & ILLUSTRATION 11. Removing the bypass valve Photo 11 (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.) Solenoid LEV-A 4-way valve LEV-B (4) Remove 3 right side panel fixing screws (5 ×...
  • Page 46 OPERATING PROCEDURE PHOTOS & ILLUSTRATION Terminal cover 14. Removing the compressor (MC) Photo 12 (1) Remove the service panel. (See Photo 1.) (2) Remove the top panel. (See Photo 1.) Lead wire for (3) Remove 2 screws (5 × 10) and remove the front cover panel. compressor (4) Remove 2 screws (5 ×...
  • Page 47 OPERATING PROCEDURE PHOTOS & ILLUSTRATION 17. Removing the controller circuit board (C.B.): Figure 1 Figure 1 Active filter module (ACTM) (1) Remove all lead wire connectors on controller circuit board (C.B.). CNF1, CNDC, CNAC, CN2, CN4, CN52C, Electrical Power circuit board (P.B.) 21S4, SV2, 63H, 63HS, LEV-A, LEV-B, parts box TH32, TH7/6, TH3, TH4...
  • Page 48 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2009 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Aug. 2009 No. OCH465 PDF 6 Made in Japan New publication, effective Aug. 2009 Specifications subject to change without notice...

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