Table of Contents
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SPLIT-TYPE, AIR CONDITIONERS
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Wireless type
Models
MSC-CB20VB -
MSC-CB25VB -
MSC-CB35VB -
MSC-CB20VB
MSC-CB25VB
MSC-CB35VB
NOTE:
•This manual describes technical data of indoor units.
E1
E1
E1
Outdoor unit service manual
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················3
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES ·······························6
5. OUTLINES AND DIMENSIONS ·························7
6. WIRING DIAGRAM ············································8
7. REFRIGERANT SYSTEM DIAGRAM ················8
8. SERVICE FUNCTIONS ······································9
9. TROUBLESHOOTING······································11
10. DISASSEMBLY INSTRUCTIONS·····················18
11. PARTS LIST······················································20
12. OPTIONAL PARTS···········································22
No. OB439
MU-GA·VB Series (OB386)
MUH-GA·VB Series (OB387)
MUX-A·VB Series (OB384)
MXZ-A·WV Series (OB319)
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MSC-CB20VB
Summary of Contents for Mitsubishi Electric MSC-CB20VB
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Page 1: Table Of Contents
SPLIT-TYPE, AIR CONDITIONERS SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS INDOOR UNIT No. OB439 SERVICE MANUAL Wireless type Models MSC-CB20VB - MSC-CB25VB - MSC-CB35VB - Outdoor unit service manual MU-GA·VB Series (OB386) MUH-GA·VB Series (OB387) MUX-A·VB Series (OB384) MXZ-A·WV Series (OB319) CONTENTS 1. -
Page 2: Technical Changes
TECHNICAL CHANGES MSC-GA20VB - MSC-CB20VB - MSC-GA25VB - MSC-CB25VB - MSC-GA35VB - MSC-CB35VB - 1. Panel logo has been changed. -
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS MSC-CB20VB MSC-CB25VB MSC-CB35VB INDOOR UNIT Front panel Air cleaning filter(option) (white bellows type) Air inlet to Breaker Panel Catechin air filter Power supply cord (With deodorizer) Remote control receiving section Air outlet Vertical vanes Remote controller... -
Page 4: Remote Controller
MSC-CB20VB MSC-CB25VB MSC-CB35VB ACCESSORIES <Indoor unit> Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 3.5 o 16 mm Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) -
Page 5: Specification
SPECIFICATION Indoor model MSC-CB20VB MSC-CB25VB MSC-CB35VB Cooling Heating Cooling Heating Cooling Heating Function Single phase Single phase Single phase Indoor unit power supply 230V,50Hz 230V,50Hz 230V,50Hz Capacity Air flow(High/Med./Low) 474/372/276 510/420/342 474/384/306 588/456/342 582/444/324 606/498/396 Power outlet Running current 0.17 0.17... -
Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MSC-CB20VB MSC-CB25VB SPL(dB LINE FAN SPEED FUNCTION FAN SPEED FUNCTION SPL(dB LINE COOLING COOLING High High HEATING HEATING Test conditions, Test conditions. Cooling : DB27: WB19: Cooling : DB27: WB19: Heating : DB20: WB -: Heating : DB20:... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSC-CB20VB Unit: mm 81.5 133.5 MSC-CB25VB Installation plate INDOOR UNIT 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 (Connected part O,D) Insulation... -
Page 8: Wiring Diagram
WIRING DIAGRAM MSC-CB20VB MSC-CB25VB MSC-CB35VB INDOOR UNIT TO OUTDOOR UNIT LD105 RT12 CONNECTING CN201 RT11 FOR MUH OR MXZ-A TYPE NR11 CN202 MU OR MUX TYPE SR141 CN211 LD103 POWER ELECTRONIC CONTROL P.C. BOARD SUPPLY CORD ~/N 230V 50Hz POWER MONITOR RECEIVER P.C.BOARD... -
Page 9: Service Functions
SERVICE FUNCTIONS MSC-CB20VB MSC-CB25VB MSC-CB35VB 8-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board. The time will be shortened as follows. (Refer to 9-6.) Set time : 1 minute... - Page 10 8-4. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER AND AUTO RESTART FUNCTION 1. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER SW2-1 sets the AUTO RESTART FUNCTION ON / OFF. SW2-2 switches over the MU & MUX type / MUH & MXZ type. The indoor units for MU &...
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Page 11: Troubleshooting
TROUBLESHOOTING MSC-CB20VB MSC-CB25VB MSC-CB35VB 9-1. 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 unit first with the remote controller, and then after confirm- ing the horizontal vane is closed, turn off the breaker and/or disconnect the power plug. - Page 12 9-2. Instruction of troubleshooting MSC-CB20VB MSC-CB25VB MSC-CB35VB Start Indoor unit OPERATION Indoor unit Indoor unit Indoor unit operates. INDICATOR operates. operates. doesn't receive Outdoor unit lamp on the But indoor Outdoor unit the signal from doesn't operate indoor unit is...
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Page 13: Troubleshooting Check Table
9-3. Troubleshooting check table • The following indication does not depend on the shape of lamp. flashing Operation Indicator · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible abnormalities. · The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation. Before taking measures, make sure that the symptom reappears, for accurate troubleshooting. - Page 14 9-4. Trouble criterion of main parts MSC-CB20VB MSC-CB25VB MSC-CB35VB Part name Check method and criterion Figure Room Measure the resistance with a tester. temperature thermistor (RT11) Refer to 9-6. "Test point diagram and voltage", "Indoor electronic control P.C. board", the chart of thermistor.
- Page 15 Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller. B B Check of remote controller and receiver P.C. board wCheck the remote controller is exclusive for this air conditioner. Switch on the remote controller. Is LCD display on the remote con- Replace the batteries.
- Page 16 When OPERATION INDICATOR lamp flashes 0.5-second intervals or 1-time. Outdoor unit does not operate. <MUH-CB20/GA25/GA35VB, MXZ-A14/A18/A26/A32WV> D D How to check mis-wiring and serial signal error 1 Set the switch(SW2-2) 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 17 9-6. Test point diagram and voltage MSC-CB20VB MSC-CB25VB MSC-CB35VB Indoor electronic control P.C. board Power supply input 230V AC Fuse F11 250V AC 3.15A R132 Indoor fan motor 230V AC Safety device of fan by horizontal vane CN1R1 Room temperature...
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Page 18: Disassembly Instructions
2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector MSC-CB20VB MSC-CB25VB MSC-CB35VB INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screw caps of the front panel. - Page 19 OPERATING PROCEDURE PHOTOS Vane motor 3. Removing the electrical box Indoor coil thermistor Photo 3 connector (1) Remove the front panel. (Refer to 1.) connector (2) Remove the electrical cover. (Refer to 2.) Screw of the (3) Remove the V.A. clamp. (Refer to 2.) electrical box (4) Remove the cord clamp.
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Page 20: Parts List
PARTS LIST MSC-CB20VB MSC-CB25VB MSC-CB35VB 11-2. ACCESSORY AND 11-1. INDOOR UNIT STRUCTURAL PARTS REMOTE CONTROLLER 1 (W) 8 (W) Optional parts (See 12.) (W) These figures show about MSC-CB35VB. 6 (W) 11-1. INDOOR UNIT STRUCTURAL PARTS Symbol Q'ty/unit in Wiring Part No. - Page 21 MSC-CB20VB MSC-CB25VB MSC-CB35VB 11-4. INDOOR UNIT HEAT EXCHANGER 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 20 (W) (W) This figure shows MSC-CB35VB. 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Part number that is circled is not shown in the illustration.
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Page 22: Optional Parts
Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. DO NOT reuse AIR CLEANING FILTER even if it is washed. DO NOT remove or attach AIR CLEANING FILTER during unit operation. Model Part No. MSC-CB20VB- MAC-1300FT MSC-CB25VB- MSC-CB35VB- Air cleaning filter... - Page 24 HEAD OFFICE: TOKYO BLDG, 2-7-3, MARUNOUCHI, CHIYODAKU, TOKYO 100-8310, JAPAN C C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD New publication, effective Dec. 2005 Specifications subject to change without notice. Distributed in Dec. 2005. No.OB439 6 Made in Japan...