Mitsubishi Electric MSZ-GF-VE Series Service Manual Download Page 29

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No. Symptom LED

indication

Abnormal point/

Condition

Condition Remedy

Outdoor unit
operates.

8-time fl ash
2.5 seconds OFF

Zero cross detecting
circuit

Zero cross signal cannot be detected.

• It occurs with following cases.

1 Instantaneous power voltage

drop. (Short time power failure)

2 Distortion of primary voltage

• Refer to 11-5. "Check of power

supply".

9-time fl ash
2.5 seconds OFF

Inverter check mode The connector of compressor is disconnected, inverter check

mode starts.

• Check if the connector of the com-

pressor is correctly connected.
Refer to 11-5. "How to check
inverter/compressor".

NOTE:

1. The location of LED is illustrated at the right fi gure. Refer to 11-6.1.

2. LED is lighted during normal operation.

The fl ashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the fl ashing frequency is “2”.

11-4. TROUBLE CRITERION OF MAIN PARTS

MUZ-GF60VE MUZ-GF71VE

Part name

Check method and criterion

Figure

Defrost thermistor
(RT61)

Fin temperature
thermistor (RT64)

Ambient temperature
thermistor (RT65)

Outdoor heat exchanger
temperature thermistor
(RT68)

Measure the resistance with a tester.

Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, for the chart of thermistor.

Discharge temperature
thermistor (RT62)

Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.

Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, for the chart of thermistor.

Compressor

Measure the resistance between terminals using a tester.
(Temperature: -10 ~ 40°C)

Normal (

)

MUZ-GF60VE

MUZ-GF71VE

U-V

U-W

V-W

0.78 ~ 1.11

0.83 ~ 1.18

WHT

RED BLK

Outdoor fan motor

Measure the resistance between lead wires using a tester.
(Temperature: -10 ~ 40°C)

Color of lead wire

Normal (

)

RED – BLK

BLK – WHT

WHT – RED

12 ~ 17

WHT

RED BLK

R. V. coil (21S4)

Measure the resistance using a tester. (Temperature: -10 ~ 40°C)

Normal (k

)

1.85 ~ 2.24

Expansion valve coil
(LEV)

Measure the resistance using a tester. (Temperature: -10 ~ 40°C)

Color of lead wire

Normal (

)

RED – ORN

37 ~ 54

RED – WHT

RED – BLU

RED – YLW

RED

(+12V)

YLW

BLU

WHT

ORN

LEV

OFF

2.5-second OFF

0.5-second ON

Inverter P.C. board

LED

→

Flashing

OBH635C

Summary of Contents for MSZ-GF-VE Series

Page 1: ...ING 23 12 DISASSEMBLY INSTRUCTIONS 41 Models NOTE RoHS compliant products have G mark on the spec name plate HFC utilized R410A No OBH635 REVISED EDITION C PARTS CATALOG OBB635 Indoor unit service manual MSZ GF VE Series OBH634 Revision C MUZ GF60VE E2 ER2 ET2 and MUZ GF71VE E2 ER2 ET2 have been added Please void OBH635 REVISED EDITION C OUTDOOR UNIT MUZ GF60VE E1 ER1 ET1 MUZ GF60VE E2 ER2 ET2 MUZ...

Page 2: ...topping the operation of the air conditioner turn off the power supply breaker and remove the power plug Discharge the capacitor before the work involving the electric parts Precautions during the repair service Do not perform the work involving the electric parts with wet hands Do not pour water into the electric parts Do not touch the refrigerant Do not touch the hot or cold areas in the refrige...

Page 3: ...TECHNICAL CHANGES 1 MUZ GF60VE E1 MUZ GF60VE E2 MUZ GF71VE E1 MUZ GF71VE E2 1 Model name has been changed MUZ GF60VE ER1 MUZ GF60VE ER2 MUZ GF71VE ER1 MUZ GF71VE ER2 1 Model name has been changed MUZ GF60VE ET1 MUZ GF60VE ET2 MUZ GF71VE ET1 MUZ GF71VE ET2 1 Model name has been changed OBH635C ...

Page 4: ...GF60 71VE Drain socket 1 MUZ GF60VE E1 ER1 ET1 MUZ GF71VE E1 ER1 ET1 Piping Air outlet Drain outlet Air inlet back and side Drain hose Piping Air outlet Drain outlet Air inlet back and side Drain hose MUZ GF60VE E2 ER2 ET2 MUZ GF71VE E2 ER2 ET2 OBH635C ...

Page 5: ...0 40 FV50S Fan motor Model RC0J60 BC Current 1 Cooling A 0 93 0 83 Heating 0 93 0 82 Dimensions W H D mm 840 880 330 Weight kg 50 53 Special remarks Dehumidification Cooling L h 1 9 2 3 Air flow 1 Cooling High m3 h 3 492 3 426 Med 3 066 3 006 Low 1 692 1 512 Heating High 2 952 2 892 Med 2 952 2 892 Low 2 226 2 280 Sound level 1 Cooling dB A 55 Heating 55 Fan speed Cooling High rpm 950 Med 840 Low ...

Page 6: ... V Fuse F601 F880 F901 T3 15AL250 V IGBT module IC932 5 A 600 V IC700 20 A 600 V Expansion valve coil LEV 12 VDC Reactor L 340 μH Diode module IC820 20 A 600 V Circuit protection PTC64 PTC65 33 Ω Terminal block TB1 TB2 3 P Relay X64 20 A 250 V X65 20 A 250 V X69 10 A 250 V X601 3 A 250 V X602 3 A 250 V R V coil 21S4 220 240 V AC OBH635C ...

Page 7: ...00 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL 0dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE HEATING 55 NC 10 55 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL 0dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LIN...

Page 8: ...CE 100 mm or more 500 mm or more 2 1 500 mm or more when front and sides of unit are clear 2 When any 2 sides of left right and rear of unit are clear Clear 1 417 5 40 42 Drain hole 175 500 330 50 Air in Air out 2 holes 10 21 360 840 109 81 880 452 Service panel 99 5 164 5 195 3 5 4 4 Liquid refrigerant pipe joint Refrigerant pipe flared Ø 6 35 MUZ GF60VE Ø 9 52 MUZ GF71VE Gas refrigerant pipe joi...

Page 9: ...9 WIRING DIAGRAM 6 MUZ GF60VE E1 ER1 ET1 E2 ER2 ET2 MUZ GF71VE E1 ER1 ET1 E2 ER2 ET2 OBH635C ...

Page 10: ...100 Strainer 100 Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Strainer 100 MUZ GF71VE Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve with service port Capillary tube ø4 0 ø2 4 100 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Ref...

Page 11: ... Model Outdoor unit precharged Refrigerant piping length one way 7 m 10 m 15 m 20 m 25 m 30 m MUZ GF60 1 550 0 0 100 200 300 400 Calculation X g 20 g m Refrigerant piping length m 10 Model Outdoor unit precharged Refrigerant piping length one way 7 m 10 m 15 m 20 m 25 m 30 m MUZ GF71 1 900 0 0 275 550 825 1 100 Calculation X g 55 g m Refrigerant piping length m 10 NOTE Refrigerant piping exceeding...

Page 12: ...east 2 sets of wet and dry bulb thermometers to the indoor air intake as shown in the figure and at least 2 sets of wet and dry bulb thermometers to the indoor air outlet The thermometers must be attached to the position where air speed is high 2 Attach at least 2 sets of wet and dry bulb thermometers to the outdoor air intake Cover the thermometers to prevent direct rays of the sun 3 Check that t...

Page 13: ... 3 13 8 12 3 10 7 9 2 7 7 6 1 25 3 23 4 21 4 19 5 17 5 15 6 13 6 11 7 9 7 7 8 Outdoor intake air Wet bulb temperature C 20 15 10 5 0 5 10 15 0 4 0 5 0 6 0 7 0 8 0 9 1 0 1 1 1 2 1 3 Heating capacity at Rated frequency Capacity correction factor 15 20 26 MUZ GF71VE MUZ GF60VE Indoor intake air Dry bulb temperature Indoor air Dry bulb temperature difference C 19 9 18 4 16 9 15 3 13 8 12 3 10 7 9 2 7 ...

Page 14: ...5 2 0 0 50 100 150 0 0 0 5 1 0 1 5 2 0 COOL operation Both indoor and outdoor unit are under the same temperature humidity condition Operation TEST RUN OPERATION Refer to 8 3 8 4 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT Dry bulb temperature C Relative humidity 20 50 25 60 30 70 8 3 HOW TO OPERATE FIXED FREQUENCY OPERATION Test run operation 1 Press EMERGENCY OPERATION switch to start COOL or ...

Page 15: ... current A Outdoor current A Outdoor unit current 0 5 10 15 20 25 3 0 3 5 4 0 4 5 5 0 5 5 0 5 10 15 20 25 6 8 10 12 MUZ GF60VE MUZ GF71VE Outdoor unit current Ambient temperature C Outdoor current A Outdoor current A Ambient temperature C Condition Operation Test run operation Refer to 8 3 HEAT operation Indoor Outdoor Dry bulb temperature C 20 0 2 7 15 20 0 Wet bulb temperature C 14 5 1 6 12 14 5...

Page 16: ...7 24 8 17 4 01 0 49 1629 7 87 3 86 0 49 1718 7 69 3 77 0 49 1772 7 44 3 65 0 49 1862 27 26 8 42 3 11 0 37 1718 8 17 3 02 0 37 1808 8 05 2 98 0 37 1862 7 81 2 89 0 37 1915 28 18 7 17 6 38 0 89 1432 6 86 6 11 0 89 1504 6 59 5 86 0 89 1575 6 34 5 65 0 89 1647 28 20 7 47 5 75 0 77 1504 7 17 5 52 0 77 1593 6 95 5 35 0 77 1629 6 71 5 17 0 77 1701 28 22 7 78 5 06 0 65 1557 7 50 4 88 0 65 1656 7 32 4 76 0...

Page 17: ...5 79 3 53 0 61 2076 27 24 7 01 3 44 0 49 1969 6 59 3 23 0 49 2059 6 22 3 05 0 49 2148 27 26 7 38 2 73 0 37 2041 6 95 2 57 0 37 2130 6 53 2 41 0 37 2220 28 18 5 98 5 32 0 89 1754 5 49 4 89 0 89 1862 5 06 4 51 0 89 1933 28 20 6 28 4 84 0 77 1826 5 86 4 51 0 77 1915 5 43 4 18 0 77 2023 28 22 6 65 4 32 0 65 1897 6 22 4 04 0 65 2005 5 79 3 77 0 65 2076 28 24 7 01 3 72 0 53 1969 6 59 3 49 0 53 2059 6 22...

Page 18: ...7 24 9 51 4 57 0 48 1938 9 16 4 40 0 48 2045 8 95 4 29 0 48 2109 8 66 4 16 0 48 2215 27 26 9 80 3 53 0 36 2045 9 51 3 43 0 36 2151 9 37 3 37 0 36 2215 9 09 3 27 0 36 2279 28 18 8 34 7 34 0 88 1704 7 99 7 03 0 88 1789 7 67 6 75 0 88 1874 7 38 6 50 0 88 1960 28 20 8 70 6 61 0 76 1789 8 34 6 34 0 76 1896 8 09 6 15 0 76 1938 7 81 5 94 0 76 2024 28 22 9 05 5 79 0 64 1853 8 73 5 59 0 64 1970 8 52 5 45 0...

Page 19: ...6 75 4 05 0 60 2471 27 24 8 17 3 92 0 48 2343 7 67 3 68 0 48 2450 7 24 3 48 0 48 2556 27 26 8 59 3 09 0 36 2428 8 09 2 91 0 36 2535 7 60 2 73 0 36 2641 28 18 6 96 6 12 0 88 2087 6 39 5 62 0 88 2215 5 89 5 19 0 88 2300 28 20 7 31 5 56 0 76 2173 6 82 5 18 0 76 2279 6 32 4 80 0 76 2407 28 22 7 74 4 95 0 64 2258 7 24 4 63 0 64 2386 6 75 4 32 0 64 2471 28 24 8 17 4 25 0 52 2343 7 67 3 99 0 52 2450 7 24...

Page 20: ...26 3 67 1358 4 56 1593 5 37 1756 6 26 1882 7 14 1973 7 96 2027 8 84 2082 MUZ GF71VE CAPACITY 8 1 kW INPUT 2230 W INDOOR DB C OUTDOOR WB C 10 5 0 5 10 15 20 Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT 15 5 10 1450 6 16 1739 7 21 1962 8 26 2119 9 32 2252 10 29 2319 11 34 2364 21 4 86 1561 5 83 1851 6 89 2052 7 86 2208 8 91 2319 9 88 2386 10 89 2475 26 4 37 1673 5 43 1962 6 40 2163 7 45 2...

Page 21: ...n motor turns OFF 15 seconds after the compressor has stopped running 9 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor Purpose Actuator Compressor LEV Outdoor fan motor R V coil Indoor fan motor Defrost heater Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protec tion Defrost thermistor Heating Defrosting Fin t...

Page 22: ...the pre heat control 1 If moisture gets into the refrigerant cycle and freezes it may interfere the start up of the compressor 2 If liquid refrigerant collects in the compressor a failure in the compressor may occur The pre heat control turns ON when the compressor temperature is 20 C or below When the pre heat control turns ON the compressor is energized About 70 W Pre heat control setting JK ON ...

Page 23: ...apacitor 4 When removing the electronic control P C board hold the edge of the board with care NOT to apply stress on the components 5 When connecting or disconnecting the connectors hold the connector housing DO NOT pull the lead wires 3 Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality To make sure check how man...

Page 24: ... does the upper lamp of OPERATION INDICA TOR lamp stay ON for 3 seconds When it stays ON for 3 seconds without beep The outdoor unit is abnormal The indoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the indoor unit failure mode table Refer to indoor unit service manual Make sure to check at least 2 consecutive blinking cycles 2 Releasing the failure...

Page 25: ...elease the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Repair the failure parts The outdoor unit is normal Release the failure mode recall function accord ing to the left mentioned procedure Deleting the memorized abnormal condition After repairing the unit recall the failure mode again accordin...

Page 26: ...rmality Compressor start up failure protection 12 time flash 2 5 seconds OFF Compressor current is abnormal Reconnect compressor connector Refer to 11 5 How to check inverter compressor 5 time flash 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor exceeds 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 100 C or less 3 min...

Page 27: ... valve Closed valve 14 time flash 2 5 seconds OFF Closed valve is detected by compressor current Check stop valve 4 way valve Pipe temperature 16 time flash 2 5 seconds OFF The 4 way valve does not work properly The indoor coil thermistor detects an abnormal temperature Check 4 way valve Replace inverter P C board Outdoor refrigerant system abnormality 17 time flash 2 5 seconds OFF A closed valve ...

Page 28: ...to 11 5 Check of LEV 10 4 time flash 2 5 seconds OFF Fin temperature P C board tem perature thermistor overheat protection Temperature of fin temperature thermistor on the heat sink exceeds 75 80 C or temperature of P C board temperature thermistor on the inverter P C board exceeds 70 75 C Check around outdoor unit Check outdoor unit air passage Refer to 11 5 Check of outdoor fan motor 11 5 time f...

Page 29: ...ermistor RT64 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Measure the resistance with a tester Refer to 11 6 Test point diagram and voltage 1 Inverter P C board for the chart of thermistor Discharge temperature thermistor RT62 Measure the resistance with a tester Before measurement hold the thermistor with your hands to warm it up Refer to 11 6 Test point...

Page 30: ... of open phase C Check of compressor With the connector between the compressor and the IGBT module IC700 disconnected activate the inverter and check if the inverter is normal by measuring the balance of voltage between the terminals Output voltage is 50 130 V The voltage may differ according to the tester Operation method Start cooling or heating operation by pressing EMERGENCY OPERATION switch o...

Page 31: ...drier for about 20 minutes Do not recover refrigerant gas while heating Heating part Connect the compressor and activate the inverter Then measure the time until the inverter stops due to overcurrent Operation method Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERATION Refer to 8 3 Measurement Measure the time from the start of compressor ...

Page 32: ...8 Between CN671 pin5 and pin6 First of all measure the resistance of R V coil to check if the coil is defective Refer to 11 4 In case CN602 is disconnected or R V coil is open voltage is generated between the terminal pins of the connector although no signal is being transmitted to R V coil Check if CN602 is connected Is there 230 VAC between CN602 and on the inverter P C board 3 minutes after the...

Page 33: ...board Check the connection between the connector CN931 and CN932 J Check of power supply Is there voltage 230 VAC between the indoor terminal block S1 and S2 No Yes Replace the indoor electronic control P C board Rectify indoor outdoor connecting wire Yes If lights up OK If flashes refer to 11 3 Does the upper lamp of OPERATION INDICATOR on the indoor unit light up Does LED on the inverter P C boa...

Page 34: ... the voltage by an analog tester Properly fix the LEV coil to the expansion valve Replace the inverter P C board Replace the LEV coil Replace the expansion valve Is LEV coil properly fixed to the expansion valve Does the resistance of LEV coil have the characteristics Refer to 11 4 Do you hear the expansion valve click click Do you feel the expansion valve vibrate when touching it Turn ON the powe...

Page 35: ...door fan motor If the connection is poor make it correct Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the inverter P C board Does the LED flash 10 times Replace the inverter P C board Check the corresponding parts following LED indication Refer to 11 3 Yes No Yes 10 time flash No L Check of inverter P C board OBH635C ...

Page 36: ...N Yes Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press EMERGENCY OPERATION switch A Is serial signal error indicated 6 minutes later B Yes Reinstall either the unit or the light away from each other Attach a filter on remote control receiving section of the indoor unit No NOTE Refer to the indoor unit service manual Replace the indoor electroni...

Page 37: ... trapped in the refrigerant circuit Close the stop valve and disconnect the power plug or turn the breaker OFF The unit occasionally stops when the stop valve is opened or closed during operation Open the stop valve and start the cooling operation again Yes No The refrigerant gas amount may be 60 or less than the normal amount Identify where the gas is leaking from and fix the leak CAUTION Do not ...

Page 38: ...conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outdoor unit of the air conditioner indoor outdoor wir...

Page 39: ...perature Fin temperature thermistor RT64 Resistance k Resistance k Resistance k Fin temperature thermistor RT64 CN673 Ambient temperature thermistor RT65 CN672 Discharge temperature thermistor RT62 CN671 Defrost thermistor RT61 CN671 Output to drive outdoor fan motor CN932 Outdoor heat exchanger temperature thermistor RT68 CN671 Fuse F901 T3 15AL250V Fuse F880 T3 15AL250V LEV connector CN724 Jumpe...

Page 40: ...40 2 Relay P C board MUZ GF60VE MUZ GF71VE To inverter P C board CN681 CN680 CN60 L68B L68A 10 VDC OBH635C ...

Page 41: ...erminal with this connector has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Terminal with locking mechanism Detaching points The terminal which has the locking mechanism can be detached as shown below There are 2 types refer to 1 and 2 of the terminal with locking mechanism ...

Page 42: ...he lead wires of the inverter P C board 7 Remove the screws of the PB support 8 Remove the inverter P C board from the relay panel 9 Disconnect the following connectors Relay P C board CN60 Terminal block CN680 Inverter P C board TAB65 Inverter P C board TB71 10 Remove the screws fixing the P B holder 11 Remove the relay P C board from the P B holder Photo 3 Photo 4 3 Removing R V coil 1 Remove th...

Page 43: ... 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller fan 4 Remove the screws fixing the fan motor 5 Remove the fan motor 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Remove the inverter assemb...

Page 44: ...ributed in Aug 2014 No OBH635 REVISED EDITION B Distributed in Dec 2013 No OBH635 REVISED EDITION A Distributed in Mar 2013 No OBH635 Made in Japan New publication effective Dec 2015 Specifications are subject to change without notice HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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