Mitsubishi Electric MSC-GE20VB Service Manual
Split-type air conditioners
Hide thumbs
Also See for MSC-GE20VB:
- Operating instructions manual (112 pages) ,
- Installation manual (4 pages) ,
- Manual (586 pages)
Table of Contents
Advertisement
SPLIT-TYPE AIR CONDITIONERS
SERVICE MANUAL
Models
MSC-GE20VB -
MSC-GE25VB -
MS-GE50VB
MSH-GE50VB -
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
E1
E1
E1
-
Outdoor unit service manual
E1
MU-GA•VB Series (OB386)
MUH-GA•VB Series (OB387)
E1
MUX-A•VB Series (OB384)
MXZ-A•WV Series (OB319)
MU/MUH-GE•VB Series (OBH530)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 2
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 5
5. OUTLINES AND DIMENSIONS ························ 7
6. WIRING DIAGRAM ············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ············· 10
8. SERVICE FUNCTIONS ····································11
9. MICROPROCESSOR CONTROL ··················· 14
10. TROUBLESHOOTING ····································· 22
11. DISASSEMBLY INSTRUCTIONS ···················· 33
PARTS CATALOG (OBB529)
• Another type of the electronic control P.C.
board (TYPE 2) has been added to the
original one (TYPE 1). They are both com-
patible with MS/MSH-GE50VB-
Please void OBH529.
No. OBH529
REVISED EDITION-A
.
E1
Advertisement
Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MSC-GE20VB
Summary of Contents for Mitsubishi Electric MSC-GE20VB
-
Page 1: Table Of Contents
SPLIT-TYPE AIR CONDITIONERS patible with MS/MSH-GE50VB- Please void OBH529. INDOOR UNIT No. OBH529 SERVICE MANUAL REVISED EDITION-A Models MSC-GE20VB - MSC-GE25VB - MSC-GE35VB - MS-GE50VB Outdoor unit service manual MU-GA•VB Series (OB386) MSH-GE50VB - MUH-GA•VB Series (OB387) MUX-A•VB Series (OB384) MXZ-A•WV Series (OB319) -
Page 2: Technical Changes
Revision A: • Another type of the electronic control P.C. board (TYPE 2) has been added to the original one (TYPE 1). They are both com- patible with MS/MSH-GE50VB- TECHNICAL CHANGES MSC-GA20VB - MSC-GE20VB - → MSC-GA25VB - MSC-GE25VB - →... -
Page 3: Msc-Ge35Vb
Remote controller Operation section Display section (When the grille is opened) Operation indicator lamp Emergency operation switch Remote control receiving section ACCESSORIES MSC-GE20VB MS-GE50VB MSC-GE25VB MSH-GE50VB MSC-GE35VB Installation plate Installation plate fixing screw 4 25 mm Remote controller holder Fixing screw for 1.6 mm (Black) -
Page 4: Specification
SPECIFICATION Indoor model MSC-GE20VB MSC-GE25VB MSC-GE35VB Cooling Heating Cooling Heating Cooling Heating Function Single phase Single phase Single phase Power supply 230 V, 50 Hz 230 V, 50 Hz 230 V, 50 Hz Breaker capacity Running current 0.17 0.17 0.19... -
Page 5: Band Center Frequencies, Hz
NOISE CRITERIA CURVES MSC-GE20VB MSC-GE25VB SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION COOLING COOLING High High HEATING HEATING Test conditions, Test conditions, Cooling : Dry-bulb temperature 27 Wet-bulb temperature19 Cooling : Dry-bulb temperature 27 Wet-bulb temperature 19... -
Page 6: Band Center Frequencies, Hz
MSH-GE50VB MS-GE50VB SPL(dB LINE FAN SPEED FUNCTION SPL(dB LINE FAN SPEED FUNCTION COOLING High High COOLING HEATING Test conditions, Cooling : Dry-bulb temperature 27 Wet-bulb temperature 19 Test conditions, Heating : Dry-bulb temperature 20 Wet-bulb temperature - Cooling : Dry-bulb temperature 27°C Wet-bulb temperature 19°C NC-70 NC-70 NC-60... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSC-GE20VB 81.5 133.5 Unit: mm MSC-GE25VB Installation plate Indoor unit 81.5 81.5 Wall hole Air in Installation plate Liquid line 6.35-0.5m Gas line 9.52-0.43m Insulation 37 O.D 21 I.D Drain hose 16 (Connected part O,D) Insulation 28... - Page 8 MS-GE50VB Unit: mm Installation plate Indoor unit MSH-GE50VB 1068 414.5 414.5 Wall hole 1100 Air in Installation plate Liquid line 6.35- 0.5 m Gas line 12-0.43 m Insulation 50 O.D 32 I.D Drain hose (Connected part O.D) Air out Insulation Power supply cord Lead to right 2.0 m Lead to left 1.0 m...
-
Page 9: Wiring Diagram
WIRING DIAGRAM MSC-GE20VB MSC-GE25VB MSC-GE35VB MS-GE50VB MSH-GE50VB OBH529A... -
Page 10: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MSC-GE20VB MSC-GE25VB MSC-GE35VB Refrigerant pipe 9.52 Unit:mm (with heat insulator) Indoor coil Indoor thermistor heat RT12 exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe 6.35 (with heat insulator) MS-GE50VB MSH-GE50VB Refrigerant pipe 12.7 (with heat insulator) -
Page 11: Obh529A
SERVICE FUNCTIONS MSC-GE20VB MS-GE50VB MSC-GE25VB MSH-GE50VB MSC-GE35VB 8-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. (Refer to 10-6.) The time will be shortened as follows. -
Page 12: Obh529A
AUTO RESTART FUNCTION ON/OFF. SW2- switches over the MU & MUX type/MUH & MXZ type. <MSC-GE20VB MSC-GE25VB MSC-GE35VB> The indoor units for MU & MUX type and MUH & MXZ type When the units are shipped from the factory, SW2 is as follows. -
Page 13: Obh529A
MS-GE50VB MSH-GE50VB Turn OFF the main power for the unit. Solder jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to 10-6.) <MS-GE50VB MSH-GE50VB> NOTE: • The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller. -
Page 14: Obh529A
MICROPROCESSOR CONTROL WIRELESS REMOTE CONTROLLER MSC-GE20VB MSC-GE25VB MSC-GE35VB Signal transmitting section Operation display section OPERATE /STOP (ON /OFF) button ON/OFF WARM COOL TEMPERATURE buttons CLOCK ON/OFF WARM COOL FAN SPEED CONTROL button STOP OFF-TIMER button I FEEL COOL VANE START... -
Page 15: Obh529A
MSH-GE50VB Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button ON/OFF WARM COOL TEMPERATURE buttons CLOCK ON/OFF WARM COOL VANE button FAN SPEED CONTROL button STOP (Horizontal vane button) I FEEL COOL OFF-TIMER button VANE START HEAT ON-TIMER button MODE WIDE VANE HR. -
Page 16: Obh529A
9-1. COOL ( ) OPERATION ON with a beep tone. 1. Coil frost prevention When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works. The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor heat exchanger rises. -
Page 17: Obh529A
<MUH> <MUH> OBH529A... -
Page 18: Obh529A
9-6. AUTO VANE OPERATION CONTROL or VANE To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the desired angle. in the following case: In FAN operation <MU,MUX> <MUH> VANE CONTROL or VANE VANE CONTROL or VANE <MUH>... - Page 19 When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2 C higher. Also the horizontal vane swings in various cycles. SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the air conditioner can keep comfort.
- Page 20 <MSH> 9-7. TIMER OPERATION OBH529A...
- Page 21 9-8. EMERGENCY/TEST OPERATION The indoor fan runs at High speed and the temperature control does not work. /(HEAT MODE <MUH>) with a set temperature of 24 °C. (and defrosting also <MUH>). the test run or the (or twice <MUH>) or the unit receives any signal from the remote controller.
-
Page 22: Troubleshooting
TROUBLESHOOTING MSC-GE20VB MS-GE50VB MSC-GE25VB MSH-GE50VB MSC-GE35VB 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. (1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and after con- firming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug. - Page 23 10-2. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit Indoor unit Indoor unit Indoor unit OPERATION INDICATOR operates. does not receive operates. operates. lamp on the indoor unit is But indoor the signal from Outdoor unit Outdoor unit flashing ON and OFF. unit does not remote controller.
-
Page 24: Troubleshooting Check Table
10-3. TROUBLESHOOTING CHECK TABLE • Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with the OPERATION INDICATOR lamp flashing. - Page 25 10-4. TROUBLE CRITERION OF MAIN PARTS MSC-GE20VB MS-GE50VB MSC-GE25VB MSH-GE50VB MSC-GE35VB Part name Check method and criterion Figure Measure the resistance with a tester. Room temperature (Part temperature 10°C ~ 30°C) thermistor (RT11) Indoor coil thermistor Refer to 10-6. "Test point diagram and voltage", (RT12) "Indoor electronic control P.C.
-
Page 26: Troubleshooting Flow
10-5. TROUBLESHOOTING FLOW When OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor does not operate. Check of indoor fan motor Turn OFF the power supply. Check connector CN211 visually. Is soldered point of the connector Are lead wires connected? Resolder it. correctly soldered? Reconnect the lead wires. -
Page 27: Check Of Indoor Electronic Control P.c. Board
The unit does not operate with the remote controller. Also, the OPERATION INDICATOR lamp does not light up by pressing the EMERGENCY OPERATION switch. Check of indoor electronic control P.C. board Check the both “parts side” and “pattern Varistor (NR11) side”... -
Page 28: How To Check Mis-Wiring And Serial Signal Error
When OPERATION INDICATOR lamp flashes 0.5-second intervals or 1-time. Outdoor unit does not operate. How to check mis-wiring and serial signal error MUH (Except MUH-GE50VB), MXZ 1 Set the switch(SW2- ) on indoor electronic control P.C. board to MU or MUX type, when the outdoor unit is MU or MUX type. If the setting is MUH or MXZ type, the unit does not work. -
Page 29: How To Check Mis-Wiring
When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. How to check mis-wiring MUH-GE50VB Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self -check to be displayed in 3 seconds. Start •... - Page 30 10-6. TEST POINT DIAGRAM AND VOLTAGE MSC-GE20VB MSC-GE25VB MSC-GE35VB Indoor electronic control P.C. board Power supply input 230 V AC Fuse (F11)T3.15AL 250V R132 Fan motor power supply (CN211) Safety device of fan by horizontal vane CN1R1 Room temperature Varistor...
- Page 31 MS-GE50VB MSH-GE50VB NOTE: There are two types of electronic control P.C. Indoor electronic control P.C. board boards (TYPE 1/TYPE 2). They are both compatible with MS/MSH-GE50VB TYPE 1 Fan motor power supply (CN211) Power supply input 230 V AC 5 V DC Room temperature Fuse (F11) thermistor (RT11)
- Page 32 MS-GE50VB MSH-GE50VB Indoor electronic control P.C. board TYPE 2 Fan motor power supply (CN211) Power supply input 230 V AC Fuse (F11) T3.15AL250V 5 VDC R132 Room temperature thermistor (RT11) Indoor coil thermistor (RT12) 12 VDC CN121 Vane motor power supply To disable “Auto restart (CN151) function”, solder jumper...
-
Page 33: Disassembly Instructions
Hold the sleeve, and Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 11-1. MSC-GE20VB MSC-GE25VB MSC-GE35VB NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screw caps of the front panel. - Page 34 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Vane motor Indoor coil thermistor Photo 3 connector (1) Remove the front panel. (Refer to 1.) connector (2) Remove the electrical cover. (Refer to 2.) (3) Remove the V.A. clamp. (Refer to 2.) Screw of the (4) Remove the cord clamp.
- Page 35 11-2. MS-GE50VB MSH-GE50VB NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS Photo 1 1. Removing the panel (1) Remove the screw caps of the panel. Remove the screws of the panel. (2) Pull the panel down to your side slightly and unhook the catches at the top.
- Page 36 Screws of the fan motor HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Aug. 2011. No.OBH529 REVISED EDITION-A Distributed in Dec. 2008. No.OBH529 5 New publication, effective Aug. 2011 Specifications subject to change without notice.