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Mitsubishi Electric Ecodan QUHZ-W40VA Service Manual
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Mitsubishi Electric Ecodan QUHZ-W40VA Service Manual

Air to water heat pump outdoor unit
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AIR TO WATER HEAT PUMP
SERVICE MANUAL
Outdoor Unit
[Model Name]
QUHZ-W40VA
Outdoor Unit
R744
CONTENTS
1. SAFETY PRECAUTION ................................... 2
2. SPECIFICATIONS ............................................ 3
3. DATA ............................................................. 4
4. OUTLINES AND DIMENSIONS ..................... 6
5. WIRING DIAGRAM ........................................ 7
7. TROUBLESHOOTING ................................... 9
8. DISASSEMBLY PROCEDURE ...................... 24
PARTS CATALOG (GHB15010)
No.GHH15010
Notes:

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Summary of Contents for Mitsubishi Electric Ecodan QUHZ-W40VA

  • Page 1: Table Of Contents

    AIR TO WATER HEAT PUMP No.GHH15010 SERVICE MANUAL R744 Outdoor Unit [Model Name] QUHZ-W40VA Notes: CONTENTS 1. SAFETY PRECAUTION ........2 2. SPECIFICATIONS ..........3 3. DATA ............. 4 4. OUTLINES AND DIMENSIONS ..... 6 5. WIRING DIAGRAM ........7 6.

  • Page 2: 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. Precautions during the repair service. GHH15010...

  • Page 3: Specifications

    SPECIFICATIONS 2-1. SPECIFICATIONS Power supply (Phase,Voltage,Frequency) 1ø,230V,50Hz Nominal water flow rate(Heating mode) L/min Heating Capacity 4.65 0.86 Power input Capacity Heating Power input 1.25 Nominal water flow rate(DHW mode) L/min Capacity Power input 1.35 Outdoor unit specifications Service ref. QUHZ-W40VA Running current Heating(A7/W35) DHW(A7/W65)

  • Page 4: Data

    DATA 3-1. NOISE CRITERION CURVES SPL(dB) NOTCH LINE HEATING NC-70 NC-60 NC-50 NC-40 NC-30 APPROXIMATE THRESHOLD OF NC-20 HEARING FOR CONTINUOUS NOISE 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz A7/W55 BAND CENTER FREQUENCIES, Hz FORM NAME 1000 2000 4000 8000 QUHZ-W40VA 46.4...
  • Page 5 3-2. STANDARD OPERATION DATA Heating Mode (A7/W35) (A7/W65) Capacity 4.00 5.00 Input 0.86 1.35 Outdoor unit QUHZ-W40VA Phase, Hz , 50Hz Voltage Current Discharge pressure Discharge temperature ºC Flow volume L/min Outlet water temperature ºC D.B. ºC Intake air temperature W.B.

  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm QUHZ-W40VA 2 notch holes of U-shaped Air in Air in 2 elongate holes (10X21) Air out Service panel Valve cover Pipe connection B (G1/2) Pipe connection A (G1/2) Bolt pitch for installation GHH15010...

  • Page 7: Wiring Diagram

    WIRING DIAGRAM QUHZ-W40VA GHH15010...

  • Page 8: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM SLHX MUFF Water OUT Water IN Symbol Part name Detail Compressor DC inverter single rotary compressor(Mitsubishi Electric Corporation) High pressure switch For protection(OFF:15MPa) MUFF Muffler For noise reduction Gascooler Heat exchanger (2pass) SLHX Suction line heat exchanger...

  • Page 9: Troubleshooting

    TROUBLESHOOTING 7-1. TROUBLESHOOTING control screen of the cylinder unit. is operating. the corresponding actions to be taken for service (summary). Unit conditions Check code Actions to be taken for service (summary) outdoor control board. at service The trouble is Displayed perform the required action.
  • Page 10 7-3. SELF-DIAGNOSIS ACTION TABLE Outdoor unit emergency stop Check LED Abnormal point and Check Code Case Judgment and action LED2 LED1 detection method GREEN *< Caution > (1) Power is not being supplied to (1) Check the following items Pay attention to electric shock the outdoor unit a) Earth leakage circuit breaker since the condensers...
  • Page 11 Check LED Abnormal point and Check Code Case Judgment and action LED2 LED1 detection method GREEN (1) Defective connector (CN664) (1) Connect connector (CN664) hot water temp. thermistor（TH4） connection (2) Defective (TH4) (2) Check the resistance value tion or short circuit detected a) Thermistor (TH4) disconnec- and temperature of thermistor °C or less...
  • Page 12 Check LED Abnormal point and Check Code Case Judgment and action LED2 LED1 detection method GREEN (1) Defective outdoor inverter (1) Replace the outdoor inverter Abnormality of compressor  p.c. board p.c. board phase current times compressor current abnormality (1) Obstacle contacting propeller (1) Remove obstacle Fan cutoff None...
  • Page 13 Check LED Abnormal point and Check Code Case Judgment and action LED2 LED1 detection method GREEN Overheat discharge temperature (1) Water is not being circulated (1) Check the water circuit, and in the outdoor unit water circuit correct any abnormal locations a) Cylinder unit not filled with a) Fill with water THERMO_ASSY DIS detects...
  • Page 14 Check LED Abnormal point and Check Code Case Judgment and action LED2 LED1 detection method GREEN (1) Defective connector (CN641) (1) Connect connector (CN641) defrost temp. thermistor (TH2） connection (2) Defective (TH2) (2) Check the resistance value tion or short circuit detected a) Thermistor (TH2) disconnec- and temperature of the °C or less...
  • Page 15 Check LED Abnormal point and Check Code Case Judgment and action LED2 LED1 detection method GREEN Overcurrent abnormality (1) Defective compressor lead (1) Check the continuity of the wire relay connector connection compressor and lead wires. a) Defective compressor relay a) Connect compressor relay detected by secondary current connector connection...
  • Page 16 Check LED Abnormal point and Check Code Case Judgment and action LED2 LED1 detection method GREEN Communication abnormality (1) Defective power transmission (1) Check the power transmis- between cylinder unit and outdoor line between cylinder unit and sion line between cylinder unit unit outdoor unit and outdoor unit...
  • Page 17 Outdoor unit emergency stop Check LED Abnormal point and Check Code Case Judgment and action LED2 LED1 detection method GREEN Discharge temperature high temperature protection operation times in progress Ambient air protection operation in progress times Primary current protection in operation times (compressor speed reduced)
  • Page 18 7-4. HOW TO CHECK THE PARTS Parts name Check points TH1 : Discharge temp. Disconnect the connector then measure the resistance with a tester. TH2 : Defrost temp. (At the ambient temperature of 10 to 30 °C ) TH3 : Ambient temp. Abnormal Normal TH4 : Hot water temp.
  • Page 19 7-5. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> High temperature thermistors Thermistor <Discharge> (TH1) Thermistor <Hot water> (TH4) Thermistor R100 = ± 2% B constant = 4014 ± 2% =13.36exp{4014( – 273+t °C °C °C °C °C °C °C °C °C °C...
  • Page 20 Low temperature thermistors Thermistor <Ambient> (TH3) Thermistor R0 = 33.18 ± 2% B constant = 3873 ± 2% =33.18exp{3873( – 273+t °C °C °C °C °C °C -10 0 10 20 30 40 50 60 Temperature (°C) Linear expansion valve <...
  • Page 21 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 22 (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. Coil Main body Stopper 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 23 7-6. TEST POINT DIAGRAM <CAUTION> TEST POINT 1 is high voltage. INVERTER P.C BOARD LD61,LD62 LDE1 Connect to the terminal block (TB) Connect to the earth Voltage of 230 V AC is input (S1-S2) LD63 LDS,LD62 Connect to Connect to the terminal block (TB) the reactor Voltage of 26 - 0 V DC is output (S3-S2)

  • Page 24: Disassembly Procedure

    DISASSEMBLY PROCEDURE QUHZ-W40VA [CAUTION] 1. Before replacing heat pump unit parts, be sure to turn the circuit breaker off. 2. Before starting work, be sure to touch a metal part such as the legs of the hot water tank unit to discharge electric charge from the body.
  • Page 25 QUHZ-W40VA 2. How to remove the inverter control board (INV P.B ASSY) PHOTOS DISASSEMBLY PROCEDURE (1) Referring to 1., remove the valve cover, service panel, top panel, front panel, and condenser net. Photo 2-1 (2) Remove the insulator and the two claws to remove the inverter control board cover.
  • Page 26 QUHZ-W40VA PHOTOS DISASSEMBLY PROCEDURE (4) Remove the earth screw, clamper and three terminals. inverter control board Press the clamper claw using long-nose pliers to remove (INV P.B ASSY) Photo 2-7 the class from the rear side. (Photo 2-7,2-8,2-9) (CAUTION) To remove the lead wire connected to the service panel, earth screw draw out the lead wire while pressing in the protrusion on the terminal.
  • Page 27 QUHZ-W40VA PHOTOS DISASSEMBLY PROCEDURE (6) Remove the two screws and two claws, then remove the Photo 2-12 inverter control board by sliding it in the direction of the arrow, and replace it with a new inverter control board. (Photo 2-12,2-13,2-14) screw Claw Photo 2-13...
  • Page 28 QUHZ-W40VA 3. How to remove the thermo assy PHOTOS DISASSEMBLY PROCEDURE (1) Referring to 1., remove the valve cover, service panel, top Photo 3-1 panel, front panel, back panel, and condenser net. (2) Remove THERMO ASSY W OUT from the clip, discon- nect connector CN664 from the inverter control board, and remove THERMO ASSY W OUT.
  • Page 29 QUHZ-W40VA 4. How to remove the lev coil PHOTOS DISASSEMBLY PROCEDURE (1) Referring to 1., remove the valve cover, service panel, top Photo 4-1 panel, front panel, and back panel. (2) Remove LEV COIL upwards from the electronic expan- sion valve, disconnect connector CN724 from the inverter control board, and remove LEV COIL.
  • Page 30 QUHZ-W40VA 5. How to remove the fan motor PHOTOS DISASSEMBLY PROCEDURE (1) Referring to 1., remove the top panel and front panel. (2) Disconnect connector CN932 of the lead wire for fan motor from the inverter control board. Photo 5-1 (3) Remove the nut (right-handed screw) and then the PROPELLER FAN.
  • Page 31 GHH15010...
  • Page 32 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Distributed in Dec. 2015 No. GHH15010 New publication, effective Dec. 2015 Made in Japan Specifications are subject to change without notice.
  • Page 33 Ecodan Homeowner Leaflet Ecodan New Build Applications Brochure Ecodan QUHZ-W40VA Databook Ecodan QUHZ-W40VA Installation Manual (GHM1501B) Ecodan QUHZ-W40VA Monobloc Air Source Heat Pump Product Information Sheet Ecodan QUHZ-W40VA Parts Catalogue (GHB15010) Ecodan QUHZ-W40VA Service Manual (GHH15010) Hightown Housing Association, Buckinghamshire New Build Home, Leicestershire, Technical Supplement QUHZ Features &...