Table of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
Wireless type
Models
MUZ-GB50VA -
MUZ-GB50VA -
NOTE:
• This service manual describes technical data of the outdoor units.
• RoHS PARTS LIST has been changed.
Please void OB455 REVISED EDITION-C.
HFC
utilized
R410A
E1
E2
R410A REFRIGERANT (OBR01)
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
3. SPECIFICATION·················································3
4. NOISE CRITERIA CURVES ·······························4
5. OUTLINES AND DIMENSIONS ·························5
6. WIRING DIAGRAM ············································6
7. REFRIGERANT SYSTEM DIAGRAM ················7
8. PERFORMANCE CURVES ································9
9. ACTUATOR CONTROL····································14
10. TROUBLESHOOTING······································15
11. DISASSEMBLY INSTRUCTIONS·····················34
12. RoHS PARTS LIST···········································38
No. OB455
REVISED EDITION-D
Indoor unit service manual
MSZ-GB·VA Series (OB454)
Refrigerant service manual
Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MUZ-GB50VA - E1MUZ-GB50VA - E2
Summary of Contents for Mitsubishi Electric MUZ-GB50VA - E1MUZ-GB50VA - E2
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Page 1: Table Of Contents
Revision D: • RoHS PARTS LIST has been changed. SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS Please void OB455 REVISED EDITION-C. OUTDOOR UNIT No. OB455 SERVICE MANUAL REVISED EDITION-D utilized R410A Wireless type Models MUZ-GB50VA - MUZ-GB50VA - Indoor unit service manual MSZ-GB·VA Series (OB454) Refrigerant service manual R410A REFRIGERANT (OBR01) -
Page 2: Technical Changes
Revision A: • Compressor has been changed. Model RoHS PARTS LIST number Previous SNB130FLDH E12 851 900 SNB130FLDH1 E12 939 900 Revision B: • REFRIGERANT SYSTEM DIAGRAM has been changed. • Oil separator has been added. • Capillary tube has been added. ([1.8 [0.6 1000) •... -
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-GB50VA ACCESSORIES Air inlet (back and side) Piping MUZ-GB50VA Drain hose Drain socket Drain cap [33 Air outlet Drain outlet SPECIFICATION Outdoor model MUZ-GB50VA Cooling Heating Function Single phase Power supply 230V,50Hz 5.0(0.9-5.8) 5.8(0.9-7.8) Capacity Rated frequency(Min.-Max.) —... -
Page 4: Noise Criteria Curves
Specifications and rating conditions of main electric parts Model MUZ-GB50VA Item (CT1,2) Current transformer ETQ19Z68AY (CT61) Current transformer ETQ19Z53AY (CB1,2,3) Smoothing capacitor 560+ 450V (F64) Fuse 250V 2A (F801) Fuse 250V 3.15A (F911) 250V 1A Fuse (LEV) Expansion valve coil CAM-MD12ME (IPM) PS21244-A... -
Page 5: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-GB50VA Unit: mm REQUIRED SPACE Open as a rule 500 mm or more if the front and both sides are open 100 mm or more 200 mm or more if 100 mm or more there are obstacles to both sides Open as a rule 500 mm or more if the back,... -
Page 6: Wiring Diagram
WIRING DIAGRAM MUZ-GB50VA... -
Page 7: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-GB50VA- Unit:mm Muffler #100 4-way valve Refrigerant pipe [12.7 (with heat insulator) Stop valve (with service port) Outdoor Flared connection Discharge heat Ambient temperature exchanger temperature thermistor Defrost thermistor RT62 thermistor RT65 RT61 Compressor Outdoor heat exchanger temperature thermistor RT68... - Page 8 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping : m Piping size O.D : mm Model Max. length Max. Height difference Liquid MUZ-GB50VA 6.35 12.7 Indoor unit Max. Height difference Max. length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A:g) Refrigerant piping length (one way) Outdoor unit Model...
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Page 9: Performance Curves
PERFORMANCE CURVES MUZ-GB50VA The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi- tions 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 24.1 22.3 20.4 18.5 16.7 14.8 13.0 11.1 Outdoor intake air Wet-bulb temperature (:) 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 Correction of Cooling total input...
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Page 11: Heat Operation
8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 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/f f [Gauge]) COOL operation Relative humidity(%) Dry-bulb temperature(:) 1 Both indoor and outdoor unit are under the... - Page 12 PERFORMANCE DATA COOL operation at Rated frequency MSZ-GB50VA : MUZ-GB50VA CAPACITY:5.0(kW) SHF:0.69 INPUT:1650(W) OUTDOOR DB( : ) INDOOR INDOOR WB(:) DB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 5.88 3.00 0.51 1320 5.63 2.87 0.51 1386 5.40 2.75 0.51 1452...
- Page 13 PERFORMANCE DATA COOL operation at Rated frequency MSZ-GB50VA : MUZ-GB50VA CAPACITY:5.0(kW) SHF:0.69 INPUT:1650(W) OUTDOOR DB( : ) INDOOR INDOOR WB(:) DB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 4.90 2.50 0.51 1617 4.50 2.30 0.51 1716 4.30 2.19 0.51 1749 5.15 2.01 0.39 1683...
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Page 14: Actuator Control
PERFORMANCE DATA HEAT operation at Rated frequency MSZ-GB50VA : MUZ-GB50VA CAPACITY:5.8(kW) INPUT:1700(W) WB( : ) OUTDOOR INDOOR DB( : ) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 3.65 1105 4.41 1326 5.16 1496 5.92 1615 6.67 1717 7.37 1768 8.12 1802 3.48 1190... -
Page 15: Troubleshooting
9-3. Relation between main sensor and actuator Actuator Sensor Purpose Outdoor Compressor fan motor R.V. coil Discharge temperature thermistor Protection Indoor pipe temperature thermistor Defrosting Protection Defrost thermistor Defrosting Fin temperature thermistor Protection Outdoor heat exchanger temperature Protection Ambient temperature thermistor Protection TROUBLESHOOTING MUZ-GB50VA... -
Page 16: Failure Mode Recall Function
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 LED indication The left lamp of Indoor/outdoor Abnormal point OPERATION INDICATOR Condition Correspondence (Outdoor P.C. board) unit failure mode (Failure mode / protection) lamp (Indoor unit) recall function LED 1 LED 2 None (Normal) Outdoor power system 2-time flash Lighting Lighting...
- Page 19 LED indication The left lamp of Indoor/outdoor Abnormal point (Outdoor P.C. board) Condition Correspondence OPERATION INDICATOR unit failure mode (Failure mode / protection) recall function lamp (Indoor unit) LED 1 LED 2 Communication error Communication error occurs between 11-time flash Lighting 6 times •...
- Page 20 10-3. Instruction of troubleshooting Start OPERATION Indoor unit Indoor unit INDICATOR Indoor unit operates. operates. doesn't receive lamp on the indoor Outdoor unit doesn't Outdoor unit the signal from unit is flashing on operate normally. doesn't remote controller. and off. operate.
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Page 21: Troubleshooting Check Table
10-4. Troubleshooting check table MUZ-GB50VA Indication Symptom Abnormal point / Condition Condition Correspondence LED1(Red) LED2(Yellow) Outdoor unit • Check the connection of the compressor connecting Overcurrent protection stop is continuously performed 3 times within does not wire. 1 minute after the compressor gets started, or when converter protection operate. - Page 22 Indication No. Symptom Abnormal point / Condition Condition Correspondence LED1(Red) LED2(Yellow) Outdoor unit These symptoms do not mean any abnormality of the Primary current protection The input current exceeds 15A. Once Lighting operates. product, but check the following points. The current of the compressor exceeds 15A. Secondary current protection •...
- Page 23 10-5. Trouble criterion of main parts MUZ-GB50VA Part name Check method and criterion Figure 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 temperature thermistor (RT68)
- 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. W • After the outdoor fan starts running, wait for 1 minute or more before Measure the voltage between each measuring the voltage.
- 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 Replace the thermistor. W (see below table), and measure the resistance of thermistor. Is the thermistor normal? W When RT64 is abnormal, replace the outdoor power board.
- 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? Disconnect CN932 from outdoor electronic control P.C.
- 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 Turn ON the power Replace 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 every 0.5-second. Outdoor unit doesn’t operate. H H How to check miswiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply.
- Page 30 I I Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the Extend the distance between antennas and the indoor the antennas and the indoor unit within 3m, or is the unit, and/or the antennas and distance between the the outdoor unit.
- Page 31 10-7. Test point diagram and voltage 1. Outdoor electronic control P.C. board MUZ-GB50VA Defrost thermistor (RT61) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Fin temperature thermistor (RT64) Discharge temperature thermistor (RT62) 10 20 30 40 50 60 70 80 100 110 120 Temperature (°C) Temperature (;)
- Page 32 2. Noise filter P.C. board MUZ-GB50VA CN901 To electronic CN902 CN903 control To power To power P.C. board board board 230V AC Input CN912 R.V. coil 230V AC 230V AC 230V AC Output Output F64 FUSE F911 FUSE NR64 VARISTOR 250V 2A 250V 1A...
- Page 33 3. Outdoor power board MUZ-GB50VA Connect to the compressor Voltage among phases: 5V to 180V 325-370V DC Connect to the earth Output (Red) Connect to the controller board (–) (+)1-5(–): Signal transmission (To electronic control P.C. board) (White) 5V DC pulse wave (+)2-5(–): Zero cross signal : Not used (+)6-5(–): 15V...
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Page 34: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 35 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 4 and power board Screws of the power board assembly (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;...
- Page 36 OPERATING PROCEDURE PHOTOS 4. Removing the defrost thermistor, discharge temper- Photo 5 ature thermistor, outdoor heat exchanger tempera- Discharge temperature thermistor 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) Disconnect the following connectors;...
- Page 37 OPERATING PROCEDURE PHOTOS 6. Removing the compressor and 4-way valve Photo 8 (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.
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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 MUZ-GB50VA 12-1. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Part No. Part Name Remarks in Wiring MUZ-GB50VA - Diagram E12 819 297 TOP PANEL OUTDOOR HEAT EXCHANGER E12 851 630 E12 938 301 OUTDOOR FAN MOTOR...
- Page 40 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 Sep. 2007. No. OB455 REVISED EDITION-D 6 Distributed in Jun. 2007. No. OB455 REVISED EDITION-C 6 Distributed in Apr.