Mitsubishi Electronics MUZ-GB50VA service manual Revised EDITION-A

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Revision A:

•Compressor has been Changed. Please void OB455.

OUTDOOR UNIT

SERVICE MANUAL

HFC	No. OB455
utilized	REVISED EDITION-A
R410A

Wireless type

Models

MUZ-GB50VA -

E1

Indoor unit service manual

MSZ-GB·VA Series (OB454)

Refrigerant service manual

R410A REFRIGERANT (OBR01)

CONTENTS

1. TECHNICAL CHANGES ··············

2. PART NAMES AND FUNCTIONS··········

3. SPECIFICATION··················

4. NOISE CRITERIA CURVES ·············

5. OUTLINES AND DIMENSIONS ···········

6. WIRING DIAGRAM ················

7. REFRIGERANT SYSTEM DIAGRAM ·········

8. PERFORMANCE CURVES ·············

9. ACTUATOR CONTROL···············

10. TROUBLESHOOTING···············

11. DISASSEMBLY INSTRUCTIONS··········

12. RoHS PARTS LIST·················

NOTE:

• This service manual describes technical data of the outdoor units.

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Contents Revised EDITION-A R410A Refrigerant OBR01 ContentsMUZ-GA50VA E1 Technical ChangesSNB130FLDH SNB130FLDH1Accessories SpecificationPart Names and Functions MUZ-GB50VASpecifications and rating conditions of main electric parts Band Octave Noise Criteria CurvesMUZ-GB50VA Outdoor Unit Outlines and DimensionsOutdoor Unit MUZ-GB50VA Wiring DiagramUnitmm Refrigerant System DiagramIndoor Unit Outdoor Unit Performance CurvesCapacity and input curves MUZ-GB50VA Test RUN Operation How to operate fixed-frequency operationCool operation Performance Data Cool operation Rated frequency 79Hz MSZ-GB50VA MUZ-GB50VAOutdoor SHC SHF InputOutdoor DB Performance Data Heat operation Actuator ControlOutdoor fan motor control R.V. coil controlRelation between main sensor and actuator MUZ-GB50 TroubleshootingOFF Failure mode recall functionOperational procedure Outdoor unit failure mode table Time flash Communication error Lighting Indicator Instruction of troubleshootingOperation EmergencyOperate Lightning Twice Outdoor power system Troubleshooting check table MUZ-GB50VAOnce Lighting RED BLK BLK WHT Trouble criterion of main parts MUZ-GB50VAWHT RED RED ORNTroubleshooting flow How to check inverter/ compressorCheck of outdoor thermistors Check of R.V. coil When heating operation does not workCheck of outdoor fan motor Check of power supplyCheck of LEV Check of current-limiting resistorParts side Electromagnetic noise enters into TV sets or radios Discharge temperature thermistor RT62 Noise filter P.C. board CN2 Outdoor power boardCN3 CN5MUZ-GB50VA Outdoor Unit Operating Procedure Photos Disassembly InstructionsRemoving the cabinet Photo Removing R.V. coil Operating Procedure PhotosRemoving outdoor fan motor Photo Ture thermistor and ambient temperature thermistorRemoving the reactor Removing the compressor and 4-way valve PhotoRoHS Parts List RoHS compliant MUZ-GB MUZ-GB50 MUZ-GB50VA Accessory