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Mitsubishi Electric QUHZ-W40VA, Service Manual

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SERVICE MANUAL

AIR TO WATER HEAT PUMP

R744

Outdoor Unit

[Model Name]

QUHZ-W40VA

Outdoor Unit

No.GHH15010

  CONTENTS

  1. SAFETY PRECAUTION ................................... 2
 2. SPECIFICATIONS ............................................ 3
 3. DATA  ............................................................. 4
  4. OUTLINES AND DIMENSIONS ..................... 6
  5. WIRING DIAGRAM ........................................ 7
  6. REFRIGERANT SYSTEM DIAGRAM ............... 8
 7. TROUBLESHOOTING ................................... 9

8. DISASSEMBLY PROCEDURE ...................... 24

PARTS CATALOG (GHB15010)

Notes:

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Summary of Contents for QUHZ-W40VA

Page 1: ... SAFETY PRECAUTION 2 2 SPECIFICATIONS 3 3 DATA 4 4 OUTLINES AND DIMENSIONS 6 5 WIRING DIAGRAM 7 6 REFRIGERANT SYSTEM DIAGRAM 8 7 TROUBLESHOOTING 9 8 DISASSEMBLY PROCEDURE 24 PARTS CATALOG GHB15010 Notes 7KLV PDQXDO GHVFULEHV VHUYLFH GDWD RI RXWGRRU XQLW RQO 5R 6 FRPSOLDQW SURGXFWV KDYH PDUN RQ WKH VSHF QDPH SODWH ...

Page 2: ...DLU FRQGLWLRQHU WXUQ RfI WKH SRZHU VXSSO EUHDNHU LVFKDUJH WKH FRQGHQVHU EHIRUH WKH ZRUN LQYROYLQJ WKH HOHFWULF SDUWV Precautions during the repair service R QRW SHUIRUP WKH ZRUN LQYROYLQJ WKH HOHFWULF SDUWV ZLWK ZHW KDQGV R QRW SRXU ZDWHU LQWR WKH HOHFWULF SDUWV R QRW WRXFK WKH UHIULJHUDQW R QRW WRXFK WKH KRW RU FROG DUHDV LQ WKH UHIULJHUDWLQJ F FOH KHQ WKH UHSDLU RU WKH LQVSHFWLRQ RI WKH FLUFXLW ...

Page 3: ...Discharge thermo Oil Model Plate fin coil Air Heat exchanger Twisted spiral Gas cooler Water Propeller fan 1 Fan drive No Fan Fan motor output Air flow CFM dB Hot gas 43 53 300 20 11 13 16 13 16 Defrost method Noise level SPL PWL Heating A7 W55 809 70 31 7 8 2 3 4 mm in mm in mm in i Width Dimensions Depth Height 57 125 7 1 15 2 54 15 to 35 15 to 35 9 to 55 9 to 55 715 28 1 8 kg lb kg lb Weight R7...

Page 4: ... FREQUENCIES Hz NOTCH HEATING A7 W55 43 SPL dB LINE NC 70 NC 60 NC 50 NC 40 NC 30 NC 20 10 20 30 40 50 60 70 80 90 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE dB 125 250 500 1000 2000 4000 8000 OA 63 QUHZ W40VA 43 45 3 46 4 40 9 35 6 33 0 25 5 21 4 46 4 BAND CENTER FREQUENCIES Hz FORM NAME ...

Page 5: ...Discharge pressure Discharge temperature Flow volume Outlet water temperature Intake air temperature kW kW V A MPa ºC L min ºC D B ºC W B ºC DHW A7 W35 Heating A7 W65 4 00 5 00 0 86 1 35 QUHZ W40VA 1 50Hz 230 230 4 7 6 8 7 4 9 7 70 100 5 7 1 4 35 65 7 7 6 6 The unit of pressure has been changed to MPa based on international SI system The conversion factor is 1 MPa 10 2 kgf cm2 ...

Page 6: ...tch for installation 303 8 406 715 21 70 809 155 500 Service panel Valve cover Pipe connection B G1 2 Pipe connection A G1 2 207 184 172 20 127 80 Air out Bolt pitch for installation 2 elongate holes 10X21 2 notch holes of U shaped Air in Air in 319 330 300 40 360 ...

Page 7: ...GHH15010 7 5 WIRING DIAGRAM QUHZ W40VA ...

Page 8: ...hermistor Defrost thermistor Ambient temperature thermistor Hot water temperature thermistor Fan motor Propeller Fan Detail DC inverter single rotary compressor Mitsubishi Electric Corporation For protection OFF 15MPa For noise reduction Heat exchanger 2pass 100 For LEV Control and compressor protection For defrost control For fan control and for compressor frequency control For DHW pump control F...

Page 9: ...KH LQVXODWLRQ UHVLVWDQFH DFURVV WKH JURXQG RI WKH RXWGRRU XQLW DQG WKH SRZHU VXSSO WHUPLQDOV 6 6 6 WR FKHFN WKDW WKH UHVLVWDQFH LV 0ȍ RU PRUH Ɣ 5HDG WKH QVWUXFWLRQ 0DQXDO EHIRUH RSHUDWLRQ Q SDUWLFXODU 6DIHW 3UHFDXWLRQV KHFN WKH V RQ WKH outdoor control board OLQNLQJ UURU GLVSOD OLQNLQJ UURU GLVSOD Lit Normal display 2II UURU GLVSOD XGJH WKH WURXEOH ORFDWLRQ DFFRUGLQJ WR DQG perform the required ac...

Page 10: ...THERMO_ASSY AMB TH3 Ɣ HWHFWLRQ PHWKRG THERMO_ASSY AMB TH3 detects 50 C or higher Excessive ambient temperature 1 Improve the installation environment 2 Replace the THERMO_ASSY AMB TH3 1 Defective board temperature thermistor on outdoor inverter p c board 2 Defective microcomputer on outdoor inverter p c board Ɣ HWHFWLRQ PHWKRG LVFRQQHFWLRQ or short circuit detected Ɣ LVFRQQHFWLRQ LVFRQQHFWLRQ cont...

Page 11: ...ctive connector CN643 connection 2 Defective TH3 a Thermistor TH3 disconnec tion b Thermistor TH3 short circuit 3 Defective outdoor inverter p c board 6KRUW FLUFXLW RU GLVFRQQHFWLRQ RI ambient temp thermistor TH3 Ɣ HWHFWLRQ PHWKRG LVFRQQHF tion or short circuit detected Ɣ LVFRQQHFWLRQ C or less detected for 1 second at start of compressor operation Ɣ6KRUW FLUFXLW C or less continued for 1 second a...

Page 12: ...rox 1 minute turn the earth leakage circuit breaker to ON again Check the following items To cancel this error turn the earth leakage circuit breaker of the Cylinder Unit to OFF and then back ON again 2SHUDWLQJ SUHVVXUH 03D FRQWDFW W SH 1 FRQQHFWRU 1 1 Check the water circuit and correct any abnormal locations a Fill with water b Bleed air c Correct or replace the water piping d Repair the isolati...

Page 13: ... cylinder unit a Replace pump1 b Replace cylinder unit board 3 Measure the resistance value of the discharge temperature thermistor TH1 See 9 4 HOW TO CHECK THE PARTS Replace the discharge tempera ture thermistor TH1 4 Check LEV coil See 9 4 HOW TO CHECK THE PARTS a Install LEV coil b Connect connector CN724 c Replace LEV coil 5 Replace outdoor unit 1 Refrigerant leakage on refrigerant circuit a E...

Page 14: ...ssor operation Ɣ6KRUW FLUFXLW C or less continued for 2 minutes at all times Ɣ RQQHFWRU 1 1 Connect connector CN643 2 Check the resistance value and temperature of the thermistor TH3 6HH 2 72 7 3 576 a Replace thermistor TH3 b Replace thermistor TH3 3 Replace the outdoor inverter p c board 1 Defective board temperature thermistor LVFRQQHFWLRQ RI 2XWGRRU LQYHUWHU p c board temp thermistor Ɣ HWHFWLR...

Page 15: ...ct connector CN724 c Replace LEV coil 4 5 Replace outdoor unit 6 Check to see if the power waveform is normal 1 Compressor relay connector disconnected 2 Defective outdoor inverter p c board Ɣ HWHFWLRQ PHWKRG 6HUYLFH mode continued for 20 minutes The service mode is entered when the outdoor unit is run with the compressor relay connector CN61 disconnected This mode is used when measuring the compr...

Page 16: ...priate voltage b Replace the power transmis sion line c Correct the power transmission line connection 2 Perform a reset 3 Replace the outdoor inverter p c board E6 E7 E8 E9 Conti nuous blinking Conti nuous blinking FC 1 Defective outdoor inverter p c board Abnormality in outdoor unit control system Ɣ HWHFWLRQ PHWKRG HWHFWHG on outdoor unit microcomputer 1 Replace the outdoor inverter p c board 1 ...

Page 17: ...3 Defective outdoor inverter p c board 1 automatic recovery performed 2 Check power supply waveform 3 Replace outdoor inverter p c board PAM control stop in progress 1 Transient power supply waveform distortion noise 2 Persistent power supply waveform distortion noise 3 Defective outdoor inverter p c board 1 automatic recovery performed 2 Check to see if the power waveform is normal 3 Replace outd...

Page 18: ...tester At the ambient temperature of 20 C Compressor MC Normal Abnormal Open or short Disconnect the connector then measure the resistance with a tester Normal Short Abnormal Open High pressure switch HPS Fan motor MF 37 0 1 33 ȍ Normal Abnormal Open or short 12 8 0 07 ȍ Measure the resistance between the terminals with a tester At the ambient temperature of 20 C W V U Linear expansion valve LEV D...

Page 19: ...ow temperature thermistors Thermistor Defrost TH2 Thermistor R0 33 18 Nȍ 2 B constant 3900 3 Rt 33 18exp 3900 273 t 273 1 Thermistor R100 Nȍ 2 B constant 4014 2 Rt 13 36exp 4014 273 t 373 1 1 High temperature thermistors Thermistor Discharge TH1 Thermistor Hot water TH4 1 0 C 33 Nȍ 10 C 20 Nȍ 20 C 13 Nȍ 25 C 10 Nȍ 30 C 8 0 Nȍ 40 C 5 3 Nȍ 20 C 250 Nȍ 30 C 161 Nȍ 40 C 107 Nȍ 50 C 72 Nȍ 60 C 50 Nȍ 70...

Page 20: ...rs Thermistor Ambient TH3 Thermistor R0 33 18 Nȍ 2 B constant 3873 2 Rt 33 18exp 3873 273 t 273 1 1 0 C 33 Nȍ 10 C 20 Nȍ 20 C 13 Nȍ 25 C 10 Nȍ 30 C 8 0 Nȍ 40 C 5 4 Nȍ LEV M 1 2 red blue orange yellow white 3 4 5 6 CN724 12 V DC Inverter p c board Drive circuit Linear expansion valve Connection between the inverter p c board and the expansion valve ...

Page 21: ...cted by placing the ear against the screw driver handle while putting the screw driver to the linear expansion valve 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...

Page 22: ...erwise pipes can bend due to pressure How to attach the coil Hold the lower part of the main body shown as A firmly so that the main body does not move and attach the coil by inserting it downward into the main body Then securely attach the coil stop per to main body At this time be careful that stress is not added to lead wire and main body is not wound by lead wire If the stopper is not firmly a...

Page 23: ...f 230 V AC is input S1 S2 LDS LD62 Connect to the terminal block TB Voltage of 26 0 V DC is output S3 S2 LDU LDV LDW Connect to the compressor CN934 High pressre switch HPS CN724 Linear expansion valve LEV CN641 Thermistor Discharge TH1 CN641 Thermistor Defrost TH2 CN643 Thermistor Ambient TH3 CN664 Thermistor Hot water TH4 CN932 Fan motor MF CAUTION TEST POINT 1 is high voltage VDC TEST POINT 1 2...

Page 24: ...e back panel and remove the back panel 9 Remove the condenser net Photo 1 3 Photo 1 1 Photo 1 2 Photo 1 3 PHOTOS QUHZ W40VA condenser net valve cover service panel screws screw Disassembly direction Disassembly direction DISASSEMBLY PROCEDURE 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 ...

Page 25: ... inserted into the power outlet of the soldering iron approx 40 W into contact with the main circuit voltage measurement discharge points as shown in the figure to completely discharge to 10 VDC or less the condenser Note however that electronic control type soldering irons cannot be used for discharging work Photo 2 2 2 3 inverter control board cover Insulator Claw Main circuit voltage measuremen...

Page 26: ...he rear side Photo 2 7 2 8 2 9 CAUTION To remove the lead wire connected to the service panel draw out the lead wire while pressing in the protrusion on the terminal inverter control board INV P B ASSY clamper earth screw Terminal block support Protrusion on terminal Clamper claw Radiator fin support After removal of the radiator fin support Claw 5 Remove the two claws and remove the radiator fin ...

Page 27: ...SSEMBLY PROCEDURE Photo 2 12 Photo 2 13 Photo 2 14 6 Remove the two screws and two claws then remove the 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 screw Disassembly direction Claw ...

Page 28: ...RMO ASSY AMB from the two clampers and then open out the holder Disconnect connector CN643 from the inverter control board and remove THERMO ASSY AMB Photo 3 2 3 3 3 4 3 5 4 Remove THERMO ASSY DEF from the clip disconnect connector CN641 from the inverter control board and remove THERMO ASSY DEF Photo 3 6 5 Remove THERMO ASSY DIS from the clip disconnect connector CN641 from the inverter control b...

Page 29: ...er service panel top 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 Photo 4 1 CAUTION When installing a new LEV COIL be sure to insert the stopper into the pipe while paying attention to its orienta tion Stopper ...

Page 30: ...or fan motor from the inverter control board 3 Remove the nut right handed screw and then the PROPELLER FAN Photo 5 1 4 Remove the lead wire for fan motor from hooks A and B and clamper C the four screws from the fan motor and fan motor Photo 5 2 5 3 CAUTION When installing the fan motor install so that the draw out part of the lead wire is facing downwards Photo 5 3 PROPELLER FAN NUT right handed...

Page 31: ...GHH15010 31 ...

Page 32: ...3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2015 MITSUBISHI ELECTRIC CORPORATION New publication effective Dec 2015 Specifications are subject to change without notice Distributed in Dec 2015 No GHH15010 Made in Japan ...

Page 33: ...an Help Videos For Homeowners Ecodan Homeowner Brochure 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 Ne...

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