Mitsubishi Electric MUZ-GB50VA Service Manual Download Page 3

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MUZ-GA50VA -

MUZ-GB50VA -

1. Refrigerant filling capacity has been changed.

2. Outdoor electronic control P.C. board has been changed.

MUZ-GB50VA -

1. Compressor has been changed. (SNB130FLDH1 SNB130FLEH1)

2. Outdoor electronic control P.C. board has been changed.

TECHNICAL CHANGES

MUZ-GB50VA -

1. Compressor has been changed. (SNB130FLEH1 SNB130FGBH)

2. Outdoor electrical parts have been changed.

3. Refrigerant circuit has been changed.

Summary of Contents for MUZ-GB50VA

Page 1: ... CONTROL 16 10 SERVICE FUNCTIONS 17 11 TROUBLESHOOTING 18 12 DISASSEMBLY INSTRUCTIONS 44 13 RoHS PARTS LIST 48 Models MUZ GB50VA E1 MUZ GB50VA E2 MUZ GB50VA E3 OUTDOOR UNIT Indoor unit service manual MSZ GB VA Series OB454 NOTE This service manual describes technical data of the outdoor units HFC utilized R410A Please void OB455 REVISED EDITION F No OB455 REVISED EDITION G Revision G Errors in TRO...

Page 2: ... has been changed Revision E MUZ GB50VA E3 has been added Revision F The fan guard for MUZ GB50VA E1 E2 E3 has been changed Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our ...

Page 3: ...hanged MUZ GB50VA E1 MUZ GB50VA E2 1 Compressor has been changed SNB130FLDH1 SNB130FLEH1 2 Outdoor electronic control P C board has been changed TECHNICAL CHANGES 1 MUZ GB50VA E2 MUZ GB50VA E3 1 Compressor has been changed SNB130FLEH1 SNB130FGBH 2 Outdoor electrical parts have been changed 3 Refrigerant circuit has been changed ...

Page 4: ...E1 E2 W 850 E3 900 Compressor motor current 1 A 6 91 7 11 Fan motor Model RC0J60 AA Current 1 A 0 32 Dimensions W H D mm 840 850 330 Weight kg 53 Dehumidification h 2 2 Air flow 1 High Low m3 h 2 940 1 650 2 940 2 210 Special remarks Sound level 1 High Low dB A 52 51 55 53 Fan speed High Low rpm 800 480 800 620 Fan speed regulator 2 Refrigerant filling capacity R410A kg 1 50 Refrigeration oil Mode...

Page 5: ...d coil relay SSR61 0 5 A 600 V Terminal block TB1 TB2 3 P Relay X64 20 A 250 V R V coil 21S4 AC 220 240 V Model Item MUZ GB50VA E3 Current transformer CT 20 A CT761 CT781 15 A Smoothing capacitor C61 C62 C63 620 μF 420 V Diode module DB61 25 A 600 V DB65 25 A 600 V Fuse F61 T20AL250V F701 F801 F901 T3 15AL250V Intelligent power module IPM 20 A 600 V Expansion valve coil LEV DC 12 V Reactor L61 23 ...

Page 6: ...efrigerant pipe flared ø12 7 Liquid refrigerant pipe joint Refrigerant pipe flared ø6 35 REQUIRED SPACE 4 NOISE CRITERIA CURVES OUTDOOR UNIT MICROPHONE 1m Test conditions Cooling Dry bulb temperature 35 C Wet bulb temperature 24 C Heating Dry bulb temperature 7 C Wet bulb temperature 6 C COOLING FUNCTION SPL dB A LINE High FAN SPEED HEATING 52 55 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000...

Page 7: ...AB4 V MC W U V WHT RT61 RT62 RT68 LEV Terminal block Connector 3 Symbols below indicate 2 Use copper conductors only for field wirin diagram for servicing refer to the indoor unit electric wiring 1 About the indoor side electric wiring NOTES SYMBOL NAME SYMBOL NAME CURRENT TRANSFORMER FUSE T1AL 250V LEV EXPANSION VALVE COIL L REACTOR IPM INTELLIGENT POWER MODULE CT61 FUSE T2AL 250V F64 CT1 2 CURRE...

Page 8: ...8 MUZ GB50VA E3 ...

Page 9: ...r temperature thermistor RT68 Ambient temperature thermistor RT65 Strainer 100 Unit mm Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve Stop valve with service port Capillary tube ø3 6 ø2 4 50 Capillary tube ø1 8 ø0 6 1000 Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pip...

Page 10: ...nsulator LEV R V coil OFF ON Muffler 100 Receiver Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Strainer 100 ADDITIONAL REFRIGERANT CHARGE R410A g Model Outdoor unit precharged Refrigerant piping length one way 7 m 10 m 15 m 20 m 25 m 30 m MUZ GB50VA 1 500 0 60 160 260 360 460 Calculation X g 20 g m Refrigerant piping length m 7 NOTE Refrigerant piping exce...

Page 11: ... air wet and dry bulb temperature difference 1 Attach at least 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 the...

Page 12: ...5 1 0 1 5 0 50 100 150 0 0 0 5 1 0 1 5 0 50 100 150 0 0 0 5 1 0 1 5 2 0 8 3 TEST RUN OPERATION How to operate fixed frequency operation 1 Press EMERGENCY OPERATION switch to start COOL or HEAT mode COOL Press once HEAT Press twice 2 Test run operation starts and continues to operate for 30 minutes 3 Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode 4 Indoor fan operates at ...

Page 13: ...6 7 8 Outdoor unit current A Ambient temperature C 2 8 4 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Both indoor and outdoor unit are under the same temperature humidity condition Operation TEST RUN OPERATION Refer to 8 3 NOTE The unit of pressure has been changed to MPa based on the international system of units SI unit system The conversion factor is 1 MPa Gauge 10 2 Kgf cm2 Gau...

Page 14: ... 51 1634 27 24 6 70 2 61 0 39 1502 6 45 2 52 0 39 1584 6 30 2 46 0 39 1634 6 10 2 38 0 39 1716 27 26 6 90 1 86 0 27 1584 6 70 1 81 0 27 1667 6 60 1 78 0 27 1716 6 40 1 73 0 27 1766 28 18 5 88 4 64 0 79 1320 5 63 4 44 0 79 1386 5 40 4 27 0 79 1452 5 20 4 11 0 79 1518 28 20 6 13 4 10 0 67 1386 5 88 3 94 0 67 1469 5 70 3 82 0 67 1502 5 50 3 69 0 67 1568 28 22 6 38 3 51 0 55 1436 6 15 3 38 0 55 1526 6...

Page 15: ... 51 1848 4 90 2 50 0 51 1881 27 24 5 75 2 24 0 39 1815 5 40 2 11 0 39 1898 5 25 1 10 0 21 1947 27 26 6 05 1 63 0 27 1881 5 70 1 54 0 27 1964 5 50 1 49 0 27 2013 28 18 4 90 3 87 0 79 1617 4 50 3 56 0 79 1716 4 30 3 40 0 79 1749 28 20 5 15 3 45 0 67 1683 4 80 3 22 0 67 1766 4 60 3 08 0 67 1815 28 22 5 45 3 00 0 55 1749 5 10 2 81 0 55 1848 4 90 2 70 0 55 1881 28 24 5 75 2 47 0 43 1815 5 40 2 32 0 43 ...

Page 16: ... turns ON 5 seconds before the compressor starts up OFF The fan motor turns OFF 15 seconds after the compressor has stopped running PERFORMANCE DATA HEAT operation at Rated frequency MSZ GB50VA MUZ GB50VA CAPACITY 5 8 kW INPUT 1700 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 3 65 1105 4 41 1326 5 16 1496 5 92 1615 6 67 1717 7 37 1768 8 12...

Page 17: ...ING Changing defrost finish temperature JS To change the defrost finish temperature cut solder the JS wire of the outdoor inverter P C board Refer to 11 6 4 Jumper wire Defrost finish temperature C JS Soldered Initial setting 9 None Cut 18 10 2 PRE HEAT CONTROL SETTING PRE HEAT CONTROL When moisture gets into the refrigerant cycle it may interfere the start up of the compressor at low outside temp...

Page 18: ...itor 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 housing of the connector DO NOT pull the lead wires 3 Troubleshooting procedure 1 First check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality To make sure chec...

Page 19: ...mal The indoor unit is abnormal Check the blinking pattern and confirm the abnormal point with the indoor unit failure mode table Refer to indoor unit service manual Make sure to check at least two consecutive blinking cycles 2 Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET b...

Page 20: ...heck the blinking pattern and confirm the abnormal point with the out door unit failure mode table 11 2 3 Make sure to check at least two consecutive blinking cycles 2 Releasing the failure mode recall function Release 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 defective parts Th...

Page 21: ...ck of outdoor fan motor P C board temperature 4 times Goes out The P C board temperature exceeds 70 C during operation 8 time flash Outdoor fan motor Lighting Lighting Failure occurs continuously three times within 30 seconds after the fan gets started Refer to 11 5 Check of outdoor fan motor 9 time flash Nonvolatile memory data Lighting 5 times Nonvolatile memory data cannot be read properly Repl...

Page 22: ... C in HEAT mode Temperature defrost thermistor exceeds 70 C in COOL mode Check refrigerant circuit and refrigerant amount Check stop valve 7 time flash 2 5 seconds OFF Fin temperature P C board temperature 7 time flash 2 5 seconds OFF Temperature of fin temperature thermistor on the inverter P C board exceeds 75 80 C or temperature of P C board temperature thermistor on the inverter P C board exce...

Page 23: ...estarts 3 min utes later is repeated Twice Goes out lPM protection Overcurrent is detected after 30 seconds of compressor start up Reconnect compressor connector Refer to 11 5 How to check in verter compressor Check the stop valve Check the power module PAM module Lock protection Overcurrent is detected within 30 seconds of compressor start up 11 3 times Goes out Discharge tempera ture protection ...

Page 24: ...on The discharge temperature exceeds 100 C during operation Check refrigerant circuit and refrig erant amount Refer to 11 5 Check of LEV Refer to 11 5 Check of outdoor thermistors 23 4 times Lighting Low discharge tem perature protection The frequency of the compressor is kept 80 Hz or more and the discharge temperature is kept under 39 C for more than 20 minutes Refer to 11 5 Check of LEV Check r...

Page 25: ...econds OFF Compressor synchro nous abnormality The waveform of compressor current is distorted Reconnect connector of compres sor Refer to 11 5 How to check in verter compressor 12 10 time flash 2 5 seconds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up Refer to 11 5 Check of outdoor fan motor Refer to 11 5 Check of inverter P C board 13...

Page 26: ...voltage 1 Outdoor electronic con trol P C board or 4 Inverter P C board for the chart of thermistor Fin temperature thermistor RT64 Compressor Measure the resistance between terminals using a tester Winding temperature 10 40 C Normal E1 E2 E3 0 40 0 49 Ω 0 86 1 06 Ω Outdoor fan motor Measure the resistance between lead wires using a tester Part temperature 10 40 C Color of lead wire Normal RED BLK...

Page 27: ...ter the outdoor fan starts running wait for 1 minute or more before measuring the voltage The output voltage values have the tolerance of 20 Is output balanced Yes No Is the input voltage to the outdoor electronic control P C board 370 V or more Yes No Replace the power board Turn off power supply of indoor and outdoor unit and measure the compressor winding resistance between the compressor termi...

Page 28: ...lashes 9 times Refer to 11 6 4 Refer to 11 5 Check of compressor operation time Does the compressor operate continuously Refer to 11 5 Check of compressor start failure OK No Yes Refer to 11 5 Check of compressor winding Is the compressor normal Replace the compressor No Yes C Check of compressor MUZ GB50VA E3 D Check of compressor winding Disconnect the connector CN61 between the compressor and i...

Page 29: ...irect current voltage between DB61 and on the inverter P C board Voltage between outdoor terminal block S1 S2 1 2 3 4 MUZ GB50VA E3 E Check of compressor operation time Connect the compressor and activate the inverter Then measure the time until the inverter stops due to over current Operation method Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST ...

Page 30: ...Fin temperature RT64 Between CN642 pin1 and pin2 Ambient temperature RT65 Between CN643 pin1 and pin2 Outdoor heat exchanger temperature RT68 Between CN644 pin1 and pin3 Replace the thermistor except RT64 When RT64 is abnormal replace the inverter P C board or the outdoor power board Replace the inverter P C board or the outdoor power board No No Is the thermistor normal Refer to 11 6 1 or 4 Recon...

Page 31: ... occurs between terminals even when the control is OFF MUZ GB50VA E1 E2 Heating operation does not work Is there voltage of 230 VAC between pin1 and pin 2 at connector CN912 Yes No Disconnect the lead wire leading to the compressor 3 minutes after turning on the power supply start EMERGENCY OPERATION in HEAT mode 1 2 Turn off power supply of indoor and outdoor unit and discon nect the connector CN...

Page 32: ...oard Replace the 4 way valve Unit operates COOL mode even if it is set to HEAT mode Is there 230 VAC between CN721 and on the inverter P C board 3 minutes after the power supply is turned ON Yes No Replace the inverter P C board Replace the 4 way valve Unit operates HEAT mode even if it is set to COOL mode Disconnect connector CN61 between the compressor and the intelligent power module Turn ON th...

Page 33: ...urn on the power supply Rotate the outdoor fan motor manually and measure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Does the voltage between each terminal become 5 and 0 VDC repeatedly Does the outdoor fan motor rotate smoothly Replace the outdoor fan motor Replace the outdoor electronic control P C board or the inverter P C board Yes Yes No Fixed to either 5 or 0 VDC No...

Page 34: ...ck of power supply MUZ GB50VA E1 E2 MUZ GB50VA E3 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 light up OK If flash refer to 11 3 Does the left lamp of OPERATION INDICATOR lamp on the indoor unit light up Dose LED on the inverter P C board light up or flash Refer to 11 6 4 N...

Page 35: ...l condition a short beep is emitted once the signal is received Measure each voltage between connector pins of CN724 on the inverter P C board 1 Pin Pin 2 Pin Pin 3 Pin Pin 4 Pin Pin Is there about 3 5 VAC between each NOTE Measure the voltage by an analog tester Properly fix the LEV coil to the expansion valve Replace the LEV coil Replace the expansion valve Is LEV coil properly fixed to the expa...

Page 36: ... fan mo tor If the connection is poor make it correct Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in verter 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 MUZ GB50VA E3 ...

Page 37: ... board repeat 3 6 second OFF and 0 8 second ON quick blinking 3 Yes No Lighted or not lighted Replace the inverter P C board or the outdoor electronic control P C board 2 2 Be careful of the residual voltage of smoothing capacitor Turn OFF the power supply Remove the short circuit between outdoor terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20 VDC between outdoor t...

Page 38: ... control P C board Turn OFF power supply before removing P C board Confirm LED1 indication lamp on the outdoor electronic control P C board Turn ON power supply Start operation Blink 6 times Replace the outdoor electronic control P C board Lighting Replace the outdoor electronic control P C board Blink 9 times Replace the power board Confirm LED1 indication lamp on the outdoor electronic control P...

Page 39: ...or the installation condition combination of specific 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 ...

Page 40: ...ulse wave To fan motor Defrost thermistor RT61 Discharge temperature thermistor RT62 Outdoor heat exchanger temperature thermistor RT68 Rush current relay R V coil 12 VDC 15 V 15 V CN931 CN661 CN701 Signal transmission To power board 5 VDC pulse wave GND CN702 Signal reception From power board 5 VDC pulse wave GND power board CN781 CN795 12 VDC pulse wave LEV 0 10 20 30 40 50 60 70 80 90 100 110 1...

Page 41: ...0 VAC 230 VAC Input 230 VAC Output CN901 To electronic control P C board MUZ GB50VA E1 E2 F64 FUSE T2AL250V F911 FUSE T1AL250V 2 Noise filter P C board CN902 To power board CN903 To power board 230 VAC Output NR64 VARISTOR ...

Page 42: ...tronic control P C board 5 V DC pulse wave CN3 Fin temperature thermistor RT64 MUZ GB50VA E1 E2 3 Outdoor power board 1 3 325 370 VDC Output Red White Connect to the compressor Voltage among phases 5 V to 180 V Connect to the earth CN5 Primary current detection Connect to the noise filter CN2 Connect to the controller board 1 5 Signal transmission To electronic control P C board 5 V DC pulse wave ...

Page 43: ...50VA E3 Back side of unit CN642 Fin temperature thermistor RT64 CN643 Ambient temperature thermistor RT65 CN641 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN724 LEV connector DB61 260 300 VDC Front side of unit 230 VAC C62 Smoothing capacitor Output to drive compressor LDU LDV LDW F701 Fuse T3 15AL250V C61 Smoothing capacitor C63 Smoothing capacitor F801 Fuse T3 15AL250V F...

Page 44: ...Disconnect the power supply and indoor outdoor connecting wire 8 Remove the screws of the cabinet 9 Remove the cabinet 10 Remove the screws of the back panel 11 Remove the back panel Photo 3 Photo 1 Photo 2 Screw of the top panel Screws of the cabinet Screws of the cabinet Screw of the motor support Set screws of the back panel Screws of the back panel Screws of the top panel Screws of the cabinet...

Page 45: ...se filter P C board 13 Remove the noise filter P C board from the inverter assem bly Photo 4 MUZ GB50VA E1 E2 Photo 5 MUZ GB50VA E3 Photo 6 Inverter assembly MUZ GB50VA E3 MUZ GB50VA E3 3 Removing the inverter assembly inverter P C board 1 Remove the cabinet and panels Refer to 1 2 Disconnect the lead wire to the reactor and the following con nectors Inverter P C board CN721 R V coil CN932 Fan mot...

Page 46: ...or and outdoor heat exchanger temperature thermistor CN663 Ambient temperature thermistor 4 Pull out the defrost thermistor from its holder 5 Pull out the discharge temperature thermistor from its holder 6 Pull out the outdoor heat exchanger temperature thermistor from its holder 7 Pull out the ambient temperature thermistor from its holder 6 Removing outdoor fan motor 1 Remove the top panel cabin...

Page 47: ...azed part of the suction and the discharge pipe connected with compressor 6 Remove the compressor nuts 7 Remove the compressor 8 Detach the brazed part of 4 way valve and pipe Photo 10 Photo 11 8 Removing the reactor 1 Remove the top panel cabinet service panel and the back panel Refer to 1 2 Disconnect the reactor lead wire 3 Remove the screws of the reactor and remove the reactor Photo 5 12 Phot...

Page 48: ...oHS PARTS LIST RoHS compliant MUZ GB50VA E1 MUZ GB50VA E2 13 1 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS 4 17 1 12 9 11 2 5 6 7 8 15 13 18 20 21 22 23 27 28 29 3 10 14 16 19 26 25 24 ...

Page 49: ...QUID 1 1 ø6 35 13 G E12 851 640 EXPANSION VALVE 1 1 14 G E12 851 493 EXPANSION VALVE COIL LEV 1 1 15 G E12 935 490 R V COIL 21S4 1 1 16 G E12 891 961 4 WAY VALVE 1 1 17 G E12 819 650 VALVE COVER 1 1 18 G E12 819 245 SERVICE PANEL 1 1 19 G E12 C95 450 OUTDOOR ELECTRONIC CONTROL P C BOARD 1 1 20 G E12 935 374 TERMINAL BLOCK TB1 1 1 3 P 21 G E12 823 375 TERMINAL BLOCK TB2 1 1 3 P 22 G E12 A87 337 REA...

Page 50: ...50 MUZ GB50VA E3 13 2 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS 4 17 1 12 9 11 2 5 6 7 8 15 13 18 27 28 30 3 10 14 16 25 26 22 23 24 19 20 21 29 ...

Page 51: ...2 D58 662 STOP VALVE LIQUID 1 ø6 35 13 G E12 851 640 EXPANSION VALVE 1 14 G E12 D58 493 EXPANSION VALVE COIL LEV 1 15 G E12 D58 490 R V COIL 21S4 1 16 G E12 C18 961 4 WAY VALVE 1 17 G E12 819 650 VALVE COVER 1 18 G E12 819 245 SERVICE PANEL 1 19 G E12 D58 306 THERMISTOR SET RT61 RT62 1 DEFROST DISCHARGE 20 G E12 D58 309 AMBIENT TEMPERATURE THERMISTOR RT65 1 21 G E12 C34 307 OUTDOOR HEAT EXCHANGER ...

Page 52: ...G CO LTD Distributed in Jun 2011 No OB455 REVISED EDITION G Distributed in Jun 2010 No OB455 REVISED EDITION F 5 Distributed in Apr 2008 No OB455 REVISED EDITION E 6 Distributed in Sep 2007 No OB455 REVISED EDITION D 6 Distributed in Jun 2007 No OB455 REVISED EDITION C 6 Distributed in Apr 2007 No OB455 REVISED EDITION B 6 Distributed in Aug 2006 No OB455 REVISED EDITION A 6 Distributed in Mar 200...

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