Mitsubishi MUZ-GB50VA Service Manual
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Mitsubishi MUZ-GB50VA Service Manual

Outdoor unit split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

OUTDOOR UNIT

SERVICE MANUAL

Wireless type
Models
MUZ-GB50VA -
NOTE:
• This service manual describes technical data of the outdoor units.
• Compressor has been Changed.
Please void OB455.
HFC
utilized
R410A
E1
R410A REFRIGERANT (OBR01)
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
3. SPECIFICATION·················································3
4. NOISE CRITERIA CURVES ·······························5
5. OUTLINES AND DIMENSIONS ·························6
6. WIRING DIAGRAM ············································7
7. REFRIGERANT SYSTEM DIAGRAM ················8
8. PERFORMANCE CURVES ································9
9. ACTUATOR CONTROL····································14
10. TROUBLESHOOTING······································15
11. DISASSEMBLY INSTRUCTIONS·····················34
12. RoHS PARTS LIST···········································38
No. OB455
REVISED EDITION-A
Indoor unit service manual
MSZ-GB·VA Series (OB454)
Refrigerant service manual

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Summary of Contents for Mitsubishi MUZ-GB50VA

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL Wireless type Models MUZ-GB50VA - NOTE: • This service manual describes technical data of the outdoor units. Revision A: • Compressor has been Changed. Please void OB455. utilized R410A Indoor unit service manual MSZ-GB·VA Series (OB454)

  • Page 2: Revision A

    Revision A: • Compressor has been changed. Model RoHS PARTS LIST number Previous SNB130FLDH E12 851 900 SNB130FLDH1 E12 939 900 TECHNICAL CHANGES MUZ-GA50VA - MUZ- GB50VA - 1. Refrigerant filling capacity has been changed. 2. Outdoor electronic control P.C. board has been changed.

  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS MUZ-GB50VA Air inlet (back and side) Drain hose Air outlet Drain outlet SPECIFICATION Outdoor model Function Power supply Capacity Rated frequency(Min.-Max.) Dehumidification K /h Air flow 1(High/Low) Power outlet Running current 1 Power input 1 Power factor 1...
  • Page 4 (R937A,B) Resistor (RS1~4) Solenoid coil relay (SSR61) Terminal block (TB1) Terminal block (TB2) Relay (X64) R.V. coil (21S4) MUZ-GB50VA ETQ19Z68AY ETQ19Z53AY 560+ 450V 250V 2A 250V 3.15A 250V 1A CAM-MD12ME PS21244-A PS21661-RZ 340 H 20A PS51259-A 10 " 10W 1.1 " 2W 2% 0.04 "...

  • Page 5: Noise Criteria Curves

    NOISE CRITERIA CURVES MUZ-GB50VA FAN SPEED FUNCTION SPL(dB(A)) COOLING High HEATING Test conditions, Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24: Heating : Dry-bulb temperature 7: Wet-bulb temperature 6: APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 1000 BAND CENTER FREQUENCIES, Hz...

  • Page 6: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUZ-GB50VA OUTDOOR UNIT REQUIRED SPACE 100mm or more Open as a rule 500mm or more if the back, both sides and top are open Unit: mm Open as a rule 500mm or more if the front and both...

  • Page 7: Wiring Diagram

    WIRING DIAGRAM MUZ-GB50VA OUTDOOR UNIT CN903 CN902 SSR61 F911 CN931 CN801 F801 CN912 LDE2 CN601 LDE1 HC930...

  • Page 8: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUZ-GB50VA OUTDOOR UNIT Refrigerant pipe [12.7 (with heat insulator) Stop valve (with service port) Flared connection Flared connection Stop valve Refrigerant pipe [6.35 (with heat insulator) MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Model MUZ-GB50VA Indoor unit Max.

  • Page 9: Performance Curves

    PERFORMANCE CURVES MUZ-GB50VA The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
  • Page 10 Outdoor intake air Wet-bulb temperature (:) NOTE:The above broken lines are for the heating operation without any frost and defrost operation. 8-2. Capacity and input correction by operational frequency of compressor MUZ-GB50VA Correction of Cooling capacity (Hz) The operational frequency of compressor The operational frequency of compressor 8-3.
  • Page 11 The conversion factor is: 1(MPa [Gauge] = 10.2 COOL operation 1 Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Operation : TEST RUN OPERATION (refer to 8-3.) MUZ-GB50VA (kgf/F [Gauge]) (MPa [Gauge]) 79Hz 35(˚C) Ambient temperature(˚C)

  • Page 12: Msz-Gb50Va : Muz-Gb50Va

    PERFORMANCE DATA COOL operation MSZ-GB50VA : MUZ-GB50VA CAPACITY:5.0(kW) SHF:0.69 INPUT:1650(W) INDOOR INDOOR WB(:) DB(:) SHC SHF 5.88 3.00 0.51 6.13 2.39 0.39 5.88 3.23 0.55 6.13 2.63 0.43 6.38 1.98 0.31 5.88 3.47 0.59 6.13 2.88 0.47 6.38 2.23 0.35 5.88 3.70 0.63...
  • Page 13 PERFORMANCE DATA COOL operation MSZ-GB50VA : MUZ-GB50VA CAPACITY:5.0(kW) SHF:0.69 INPUT:1650(W) INDOOR INDOOR WB(:) DB(:) SHC SHF 4.90 2.50 0.51 5.15 2.01 0.39 4.90 2.70 0.55 5.15 2.21 0.43 5.45 1.69 0.31 4.90 2.89 0.59 5.15 2.42 0.47 5.45 1.91 0.35 4.90 3.09 0.63...

  • Page 14: Actuator Control

    PERFORMANCE DATA HEAT operation MSZ-GB50VA : MUZ-GB50VA CAPACITY:5.8(kW) INPUT:1700(W) INDOOR DB( : ) INPUT INPUT 3.65 1105 4.41 1326 3.48 1190 4.18 1411 3.13 1275 3.89 1496 NOTE Q : Total capacity (kW) INPUT : Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature...

  • Page 15: Troubleshooting

    Defrost thermistor Fin temperature thermistor Outdoor heat exchanger temperature Ambient temperature thermistor TROUBLESHOOTING MUZ-GB50VA 10-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 2. Take care the following during servicing.
  • Page 16 10-2. Failure mode recall function Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (10-4.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.
  • Page 17 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Confirm if outdoor unit is abnormal according to the following procedures. Confirm that the remote controller is in the failure mode recall function.
  • Page 18 3. Outdoor unit failure mode table MUZ-GB50VA The left lamp of Abnormal point OPERATION INDICATOR (Failure mode / protection) lamp (Indoor unit) None (Normal) Outdoor power system 2-time flash 3-time flash Discharge temperature thermistor Defrost thermistor Ambient temperature thermistor Fin temperature thermistor P.C.
  • Page 19 MUZ-GB50VA The left lamp of Abnormal point OPERATION INDICATOR (Failure mode / protection) lamp (Indoor unit) Communication error 11-time flash between P.C. boards Current sensor Zero cross detecting circuit Converter Bus-bar voltage Bus-bar voltage wEven if this protection stop is...

  • Page 20: Emergency Operation

    10-3. Instruction of troubleshooting Start Indoor unit Indoor unit operates. operates. Outdoor unit doesn't Outdoor unit operate normally. doesn't operate. Outdoor unit Outdoor unit Unit doesn't doesn't operates only operate operate normal in Test Run even in operation in operation. Test Run COOL or (Refer to 8-3.)
  • Page 21 10-4. Troubleshooting check table MUZ-GB50VA Indication Symptom Abnormal point / Condition LED1(Red) LED2(Yellow) Outdoor unit does not operate. Lightning Twice Outdoor power system Discharge temperature Lightning 3 times thermistor Fin temperature thermistor Lightning 4 times P.C board temperature thermistor Ambient temperature...
  • Page 22 Indication No. Symptom Abnormal point / Condition LED1(Red) LED2(Yellow) Outdoor unit Primary current protection Once Lighting operates. Secondary current protection High-pressure protection Twice Lighting Defrosting in cooling Discharge temperature 3 times Lighting protection Low discharge 4 times Lighting temperature protection Cooling high-pressure 5 times Lighting...
  • Page 23 10-5. Trouble criterion of main parts MUZ-GB50VA Part name Defrost thermistor Measure the resistance with a tester. (RT61) Ambient temperature Refer to 10-7. “Test point diagram and voltage”,1. “Outdoor electronic thermistor (RT65) control P.C. board”, the chart of thermistor. Outdoor heat exchanger...
  • Page 24 10-6. Troubleshooting flow MUZ-GB50VA A A How to check inverter/ compressor Disconnect the terminal of the compressor. 3 minutes after turning on the power supply, start EMERGENCY OPERATION. Measure the voltage between each lead wire leading to the compressor. U (BLK) - V (WHT)
  • Page 25 • When OPERATION INDICATOR lamp flashes 6-time. • When thermistor is abnormal. B B Check of outdoor thermistors Disconnect the connector in the outdoor electronic control P.C. board or the outdoor power board (see below table), and measure the resistance of thermistor. Is the thermistor normal? Reconnect the connector CN661, CN663 and CN3.
  • Page 26 The cooling operation or heating operation does not operate. (LED display: Both LED1 and LED2 lighting) C C Check of R.V. coil • When heating operation does not work. 1. Disconnect the lead wire leading to the compressor. 2. 3 minutes after turning on the power supply, start EMERGENCY OPERATION in HEAT mode.
  • Page 27 • Fan motor does not operate or stops operating shortly after starting the operation. D D Check of outdoor fan motor Check the connection between the connector CN931 and CN932. Is the resistance between each terminal of outdoor fan motor normal? (Fixed to either 5V or 0V DC) Replace the outdoor DC fan motor.
  • Page 28 Outdoor unit does not operate at all, or stops immediately due to overcurrent. F F Check of current-limiting resistor When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly. Is the resistance of current-limiting resistor (R64A or R64B) on the noise filter P.C.
  • Page 29 • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. H H How to check mis-wiring and serial signal error (when outdoor unit does not work) Outdoor electronic control P.C.
  • Page 30 I I Electromagnetic noise enters into TV sets or radios Is the unit earthed? Is the distance between the antennas and the indoor unit within 3m, or is the distance between the antennas and the outdoor unit within 3m? Is the distance between the TV sets or radios and the indoor unit within 1m, or is the distance between the TV...
  • Page 31 10-7. Test point diagram and voltage 1. Outdoor electronic control P.C. board MUZ-GB50VA Discharge temperature thermistor (RT62) 100 110 120 Temperature (;) LED 1 LED 2 CN801 325V DC 370V DC Input F801 FUSE 3.15A/250V Defrost thermistor (RT61) Ambient temperature thermistor (RT65)
  • Page 32 2. Noise filter P.C. board MUZ-GB50VA CN901 To electronic CN902 control To power P.C. board board CN912 R.V. coil 230V AC 230V AC Output F64 FUSE NR64 VARISTOR 2A/250V CN903 To power board F911 FUSE 1A/250V 230V AC Input 2 30V AC...
  • Page 33 3. Outdoor power board MUZ-GB50VA 325-370V DC Output (Red) (–) (White) 325-370V DC Output (Red) (–) (White) Connect to the compressor Voltage among phases: 5V to 180V Connect to the earth Connect to the controller board (+)1-5(–): Signal transmission (To electronic control P.C. board) (+)2-5(–): Zero cross signal...

  • Page 34: Disassembly Instructions

    Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not. Sleeve Locking lever MUZ-GB50VA OUTDOOR UNIT OPERATING PROCEDURE 1. Removing the cabinet (1) Remove the screws of the service panel.

  • Page 35: Operating Procedure

    OPERATING PROCEDURE 2. Removing the inverter assembly, inverter P.C. board and power board (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel.(Refer to 1.) (3) Disconnect the following connectors; <Electronic control P.C. board> CN931 and CN932 (Fan motor) CN795 (LEV) CN661 (Discharge temperature thermistor, defrost...
  • Page 36 OPERATING PROCEDURE 4. Removing the defrost thermistor, discharge temper- ature thermistor, outdoor heat exchanger tempera- ture thermistor and ambient temperature thermistor (1) Remove the top panel, cabinet and service panel. (Refer to 1.) (2) Remove the back panel. (Refer to 1.) (3) Remove the inverter assembly.
  • Page 37 OPERATING PROCEDURE 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 assembly. (Refer to 2.) (4) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm...

  • Page 38: Rohs Parts List

    RoHS PARTS LIST (RoHS compliant) MUZ-GB50VA 12-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
  • Page 39 RoHS PARTS LIST (RoHS compliant) MUZ-GB50VA 12-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Part No. E12 819 297 TOP PANEL OUTDOOR HEAT EXCHANGER E12 851 630...
  • Page 40 RoHS PARTS LIST (RoHS compliant) MUZ-GB50VA 12-2. ACCESSORY Part No. E12 817 704 DRAIN SOCKET E12 444 705 DRAIN CAP HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C C Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Aug. 2006. No. OB455 REVISED EDITION-A 6 Distributed in Mar.

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