Mitsubishi MSC-GA20VB Service Manual

CONTENTS1. TECHNICAL CHANGES ··································· 2 2. PART NAMES AND FUNCTIONS ····················· 23. SPECIFICATION ···············

10REFRIGERANT SYSTEM DIAGRAM7IndoorheatexchangerRoom temperaturethermistorRT11Refrigerant pipe 9.52(with heat insulator)Unit:mmIndoor coilthermistorR

11SERVICE FUNCTIONS8Table 1No. 1 unitNo. 2 unitNo. 3 unitNo. 4 unit1 unit operationNo modification–––2 units operationSame as at leftSolder J1––3 unit

12 Operation If the main power has been cut, the operation settings remain. After the power is restored, the unit restarts automatically accord

13NOTE: •The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller. •If main p

14MICROPROCESSOR CONTROL9WIRELESS REMOTE CONTROLLERON/OFFFANTOOWARMTOOCOOLVANEMODEECONO COOL STOP STARTHR.MIN.I FEELCOOLDRY PMCLOCKAMRESETCL

15Approx. 2 or moreDifference between target temperatureand room temperatureApprox. 2or lessThis shows that the air conditioner is operating to reach

16The set temperature is determined from the initial room temperature.9-1. COOL ( ) OPERATION9-2. DRY ( ) OPERATION<MU,MUX,MUH>9-4. HEAT (

17<MUH><MUH>OBH529A

18CONTROL or VANE9-6. AUTO VANE OPERATIONThe horizontal vane position is set to Upward.To confirm the standard position, the vane moves until it touch

19When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2 C higher.Also the horizontal vane swings in various cycles.SW

2TECHNICAL CHANGES1PART NAMES AND FUNCTIONS2MSC-GA20VB -E1 → MSC-GE20VB -E1MSC-GA25VB -E1 → MSC-GE25VB -E1MSC-GA35VB -E1 → MSC-GE35VB -E11. F

20<MSH>9-7. TIMER OPERATIONOBH529A

219-8. EMERGENCY/TEST OPERATION/(HEAT MODE <MUH>) with a set (and defrosting also <MUH>).*Heat is a vailable only in MUH. temperature of 2

22TROUBLESHOOTING1010-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following: (1) Check the power supply voltage. (2) Che

23StartIndoor unit operates.Outdoor unit does not operate.Indoor unit does not receive the signal from remote controller.Indoor unit operates.Outdoor

2410-3. TROUBLESHOOTING CHECK TABLE• Refer to 10-5. "How to check mis-wiring ".No.12478SymptomOperation indicator lamp Condition Remedy

25MSC-GE20VB MS-GE50VBMSC-GE25VB MSH-GE50VBMSC-GE35VB10-4. TROUBLE CRITERION OF MAIN PARTSPart name FigureCheck method and criterionIndoor fan motor (

26No(not clear)YesYes Check of indoor fan motorA Check of remote controller and receiver P.C. boardBWhen OPERATION INDICATOR lamp flashes 3-

27 Check of indoor electronic control P.C. boardCCheck the both “parts side” and “pattern side” of indoor electronic control P.C. board visually.

28 How to check mis-wiring and serial signal errorSerial signal error is indicated.(0.5-sec. ON, 0.5-sec. OFF)1. Turn OFF the power supply(indoor/ou

29 How to check mis-wiringERefer to outdoor unit service manual.StartNoNoIs there 20 V DC between both ends of R132 on the indoor electronic cont

3Front panel(When the grille is opened)Remote controllerOperation sectionDisplay sectionEmergency operation switchOperation indicator lampAir inletTo

30MSC-GE20VBMSC-GE25VBMSC-GE35VBIndoor electronic control P.C. boardCN302Indoor coil thermistor (RT12)Room temperature thermistor (RT11)Temperature (

31MS-GE50VBMSH-GE50VBIndoor electronic control P.C. boardFan motor power supply(CN211)Fuse (F11) T3.15AL250V}Power supply input230 V AC}5 V DCIndoor c

32Receiver P.C. board+}}Resistance(k)+{Fan motor power supply(CN211)Fuse (F11)T3.15AL250V230 V AC5 VDCIndoor coilthermistor (RT12)Timer short mode poi

33DISASSEMBLY INSTRUCTIONS11(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking

34OPERATING PROCEDUREPHOTOS3. Removing the electrical box(1) Remove the front panel. (Refer to 1.)(2) Remove the electrical cover. (Refer to 2.)(3) Re

3511-2. MS-GE50VB MSH-GE50VBNOTE: Turn OFF power supply before disassembly.1. Removing the panel(1) Remove the screw caps of the panel. Remove th

Photo 4Photo 6Vane motors4. Removing the vane motor(1) Remove the panel and the corner box. (Refer to 1.)(2) Remove the electrical cover. (Refer to 2.

4SPECIFICATION3NOTE: Test conditions are based on ISO 5151. Cooling: Indoor Dry-bulb temperature 27°C Wet-bulb temperature 19 °C

5NOISE CRITERIA CURVES490807060504030201063 125 250 500 1000 2000 4000 8000NC-60NC-50NC-40NC-30NC-20NC-10NC-70OCTAVE BAND SOUND PRESSURE LEVEL, dB re

6807060504030201063 125 250 500 1000 2000 4000 8000OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BARBAND CENTER FREQUENCIES, HzNC-60NC-50NC-40N

7OUTLINES AND DIMENSIONS5MSC-GE20VB MSC-GE25VB 244242 57 or more901103014960627860815783Power supply cordLead to right 1.0mLead to left 0.3mAir outIns

82581621958477.5315255.5472.59817398 173414.5 414.552537915610681100325Air outAir inInsulation 28Drain hose 16(Connected part O.D)Installation p

9WIRING DIAGRAM6MS-GE50VBMSH-GE50VBMSC-GE20VB MSC-GE25VB MSC-GE35VBOBH529A