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Mitsubishi Electric PUHZ-W85VHA Service Manual

Air to water heat pump.
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AIR TO WATER HEAT PUMP

SERVICE MANUAL

R410A
[model name]
PUHZ-W85VHA
PUHZ-W85VHA
[Service Ref.]
PUHZ-W85VHA
Note:
• This manual describes only
service data of PUHZ-W85VHA.
• RoHS compliant products have
mark on the spec name plate.
CONTENTS
1. SAFETY PRECAUTION .......................................... 2
2. SPECIFICATIONS ..................................................... 4
3. DATA ............................................................................. 5
4. OUTLINES AND DIMENSIONS ............................ 7
5. WIRING DIAGRAM ................................................... 8
6. WIRING SPECIFICATIONS .................................... 9
7. REFRIGERANT SYSTEM DIAGRAM ................... 10
8. TROUBLESHOOTING ........................................... 11
9. DISASSEMBLY PROCEDURE ........................... 38
PARTS CATALOG (OCB439)
April 2008
No. OCH439

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Table of Contents

   Summary of Contents for Mitsubishi Electric PUHZ-W85VHA

  • Page 1: Table Of Contents

    [Service Ref.] [model name] Note: PUHZ-W85VHA PUHZ-W85VHA • This manual describes only service data of PUHZ-W85VHA. • RoHS compliant products have <G> mark on the spec name plate. CONTENTS 1. SAFETY PRECAUTION .......... 2 2. SPECIFICATIONS ............. 4 3. DATA ................5 4.
  • 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 Unit Gravimeter [3] Service tools Use the below service tools as exclusive tools for R410A refrigerant. Specifications Gauge manifold ·Only for R410A ·Use the existing fitting specifications . (UNF1/2) ·Use high-tension side pressure of 5.3 MPa·G or over. Charge hose ·Only for R410A ·Use pressure performance of 5.09 MPa·G or over.
  • Page 4: Specifications

    Cooling Capacity Cooling (A35/W18) (A35/W18) EER 3.91 Outside air temperature (Dry-bulb) °C (COP) 1.92 °C 21.5 l n i °C Model name PUHZ-W85VHA ALFA LAVAL Running current Heating 10.3 (A7/W35) 13.7 Cooling (A35/W7) 23.0 Water OUT Ref.IN (Heating) Galvanized plate Munsell 3Y 7.8/1.1...
  • Page 5: Data

    DATA 3-1. NOISE CRITERION CURVES MICROPHONE UNIT 1.5m GROUND PUHZ-W85VHA SPL(dB) MODE LINE 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 6: Standard Operation Data

    3-2. STANDARD OPERATION DATA Mode Cooling (A35/W7) Heating (A7/W35) Capacity 7,500 9,000 Input 3.12 2.31 Outdoor unit PUHZ-W85VHA Phase, Hz 1, 50 Voltage Current 13.7 10.3 Discharge pressure 2.81 2.21 Suction pressure 0.73 0.64 Discharge temperature Condensing temperature Suction temperature...
  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PUHZ-W85VHA...
  • Page 8: Wiring Diagram

    WIRING DIAGRAM PUHZ-W85VHA SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply,Interface unit / TABN1/N2 Connection Terminal <DC Voltage> Flow temp. controller> DS2, DS3 Diode bridge Motor for Compressor Power Module Fan Motor N.F. Noise Filter Circuit Board 21S4 Solenoid Valve <Four-Way Valve>...
  • Page 9: Wiring Specifications

    WIRING SPECIFICATIONS FIELD ELECTRICAL WIRING (power wiring specifications) Outdoor unit power supply ~/N (single), 50 Hz, 230 V Outdoor unit Circuit Breaker capacity 25 A Outdoor unit power supply, earth 3 × Min. 4 Interface unit/Flow temp. controller-Outdoor unit 3 × 1.5 (polar) Interface unit/Flow temp.
  • Page 10: Refrigerant System Diagram

    Refrigerant flow in heating Refrigerant flow in cooling Detail Symbol Part name 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 - 40 Plates (Alfa Laval)
  • Page 11: Troubleshooting

    TROUBLESHOOTING 8-1. TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> 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 12 8-3. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> Abnormal point and detection method Judgment and action Error Code Case 1 No voltage is supplied to terminal 1 Check following items. block (TB1) of outdoor unit. a) Power supply breaker a) Power supply breaker is b) Connection of power supply terminal block.
  • Page 13 Abnormal point and detection method Case Judgment and action Error Code Check disconnection or looseness or polarity Contact failure or miswiring of Miswiring of Interface unit/Flow temp. Interface unit/Flow temp. controller- of Interface unit/Flow temp. controller-outdoor controller-outdoor unit connecting wire outdoor unit connecting wire unit connecting wire of Interface unit/Flow 1.
  • Page 14 <Abnormalities detected while unit is operating> Abnormal point and detection method Judgment and action Error Code Case High pressure (High-pressure switch 1 Decreased water flow 1~5 Check water circuit and repair the defect. 63H activated) 2 Clogged filter of water pipe Abnormal if high-pressure switch 63H is 3 Dirt of plate heat exchanger activated ( w ) during compressor opera-...
  • Page 15 Abnormal point and detection method Judgment and action Error Code Case Open/short of outdoor unit thermistors 1 Disconnection or contact failure 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 16 Abnormal point and detection method Judgment and action Error Code Case Outdoor fan motor 1 Failure in the operation of 1 Check or replace the DC 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 17 Abnormal point and detection method Judgment and action Error Code Case Compressor overcurrent interruption 1 Decrease of power supply voltage 1 Check facility of power supply. Abnormal if overcurrent DC bus or com- 2 Looseness, disconnection or 2 Correct the wiring (U W phase) to com- •...
  • Page 18 Abnormal point and detection method Judgment and action Error Code Case Remote controller transmission error (E3)/signal receiving error (E5) 1 2 remote controllers are set as 1 Set a remote controller to main, and the 1 Abnormal if remote controller could not find “main.”...
  • Page 19 Abnormal point and detection method Judgment and action Error Code Case Freezing/overheating protection is working <Cooling mode> <Cooling mode> (1) Freezing protection <Cooling mode> 1 Reduced water flow 12 Check water piping. Abnormal if plate heat exchanger pipe · Clogged filter temperature (TH6) stays at -5: or lower ·...
  • Page 20 3. Defrosting mode During compressor operation TH32 < 0: Thermistor TH32: Inlet water temperature 8-4. HOW TO CHECK THE PARTS PUHZ-W85VHA Parts name Check points TH3: Liquid pipe Disconnect the connector then measure the resistance with a tester. temperature (At the ambient temperature of 10 ~30 )
  • Page 21 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. Give attention to the service. · Do not pull out the connector (CNF1) of the motor with the power supply on. (It may damage the outdoor controller circuit board and fan motor.) Self check...
  • Page 22 8-5. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid pipe> (TH3) • Thermistor <Plate Hex liquid pipe> (TH6) • Thermistor <Ambient> (TH7) Thermistor R0 = 15k' ± 3% B constant = 3480 ± 2% =15exp{3480( 273+t –...
  • Page 23 Low temperature thermistor • Thermistor <Inlet water> (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 24 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 25 (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 26 8-6. TEST POINT DIAGRAM <CAUTION> TEST POINT 1 is high voltage. Outdoor controller circuit board (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 High pressure switch : DC 280 V-380 V CNDC DC 280 V -380 V...
  • Page 27 Outdoor noise filter circuit board LO, NO Voltage of 220-240 V AC is output. Connect to the outdoor power circuit board (TABS, TABT). CNAC1, CNAC2 Connect to the 220-240 V AC earth. Connect to the out- door controller cir- cuit board (CNAC). Input current Connect to the outdoor power...
  • Page 28 Outdoor power circuit board Brief Check of POWER MODULE w Usually, they are in a state of being short-circuited if they are broken. Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken. 1.
  • Page 29 Active filter module Connect to the outdoor power circuit board (TABP2) L1, L2 Connect to the DCL (Reactor) Non-connect Upper Lower side side Non-connect Connect to the outdoor power circuit board (TABP1) Connect to the outdoor – Connect to the outdoor power circuit board (CNAF) Connect to the outdoor power circuit board (TABN1)
  • Page 30 8-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION Operation indicator SW2: Indicator change of self diagnosis SW2 setting Display detail Explanation for display Unit 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) Display when the power supply is ON.
  • Page 31 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 32 Pulse (Example) When 150 pulse; 0.5 secs. 0.5 secs. 2 secs. 2 3 4 5 6 Capacity settings The outdoor capacity code is shown as below Model Code PUHZ-W85VHA Code display 2 3 4 5 6...
  • Page 33 SW2 setting Display detail Explanation for display Unit – 39~88 Plate HEX liquid pipe temperature (TH6) (When the temperature is 0: or less, “–” and – 39~88 temperature are displayed by turns.) 2 3 4 5 6 Condensing temperature (T –...
  • Page 34 SW2 setting Display detail Explanation for display Unit 0~500 LEV-B opening pulse (When it is 100 pulse or more, hundreds digit, tens 0~500 digit and ones digit are displayed by turns.) Pulse 2 3 4 5 6 U9 error detail history (latest) Error details Cause Code...
  • Page 35 SW2 setting Display detail Explanation for display Unit 0~225 Operation frequency when error occured. 0~225 (When it is 100 Hz or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 105 Hz; 0.5 secs. 0.5 secs. 2 secs. 2 3 4 5 6 Fan step when error occured.
  • Page 36 Explanation for display Unit SW2 setting Display detail Sub cool (SC) when error occured. 0~130 0~130 (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by Cooling: SC = T -TH3 turns.) 63HS Heating: SC = T -TH6 (Example) When 115°C;...
  • Page 37 <Important Note> All these dip switches on PUHZ-W85VHA 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 38: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUHZ-W85VHA PHOTOS & ILLUSTRATION OPERATING PROCEDURE Top panel fixing screws 1. Removing the service panel and top panel Photo 1 Top panel (1) Remove 3 screws (5 x 10) and slide the hook on the right downward to remove the service panel.
  • Page 39: Operating Procedure

    OPERATING PROCEDURE PHOTOS & ILLUSTRATION 4. Removing the thermistor <Plate HEX Liquid> (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 40: Heating

    OPERATING PROCEDURE PHOTOS & ILLUSTRATION 8. Removing the solenoid valve coil <Four-way valve> (21S4) Photo 9 linear expansion valve coil (LEV (A), LEV (B)) and solenoid valve coil <Bypass valve> (SV) Solenoid Four-way valve LEV-A (1) Remove the service panel. (See photo 1.) valve coil (21S4) (2) Remove the top panel.
  • Page 41 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 Four-way valve LEV-B (4) Remove 3 right side panel fixing screws (5 x 10) in the rear valve coil (21S4)
  • Page 42 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 x 10) and remove the front cover panel. compressor (4) Remove 2 screws (5 x 10) and remove the back cover panel.
  • Page 43 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 44 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN ©Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. New publication, effective Apr. 2008 Distributed in Apr. 2008 No. OCH439 PDF 8 Specifications subject to change without notice. Made in Japan...

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