Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Wireless type
Models
MSH-CB50VB -
MSH-CB50VB
NOTE:
This service manual describes technical data of the indoor unit.
E1
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································4
4. NOISE CRITERIA CURVES ·······························4
5. OUTLINES AND DIMENSIONS ·························5
6. WIRING DIAGRAM ············································6
7. REFRIGERANT SYSTEM DIAGRAM ················6
8. SERVICE FUNCTIONS ······································7
9. TROUBLESHOOTING·········································9
10. DISASSEMBLY INSTRUCTIONS·····················17
11. PARTS LIST······················································19
12. OPTIONAL PARTS···········································21
No. OB440
Outdoor unit service manual
MUH-GA·VB Series (OB368)
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Table of Contents
Related Manuals for Mitsubishi Electric MSH-CB50VB- E1
Summary of Contents for Mitsubishi Electric MSH-CB50VB- E1
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS INDOOR UNIT No. OB440 SERVICE MANUAL Wireless type Models MSH-CB50VB - Outdoor unit service manual MUH-GA·VB Series (OB368) CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················2 3. SPECIFICATION·················································4 4. NOISE CRITERIA CURVES ·······························4 5. -
Page 2: Technical Changes
TECHNICAL CHANGES MSH-GA50VB - MSH-CB50VB - 1. Panel logo has been changed. PART NAMES AND FUNCTIONS INDOOR UNIT MSH-CB50VB Air cleaning filter (option) Grille (White bellows type) Air inlet To Breaker Front panel Power supply cord Catechin air filter Remote control receiving section Vertical vanes Horizontal vane... -
Page 3: Remote Controller
REMOTE CONTROLLER MSH-CB50VB Signal transmitting section Operation display section OPERATE /STOP (ON /OFF)button ON/OFF WARM COOL TEMPERATURE buttons Indication of remote controller model is on back. Open the front lid. CLOCK ON/OFF WARM COOL VANE button FAN SPEED CONTROL button STOP (Horizontal vane button) I FEEL COOL... -
Page 4: Specification
SPECIFICATION Indoor model MSH-CB50VB Cooling Heating Function Single phase Power supply 230V, 50Hz Capacity Air flow(High/Med./Low) K /h 768/642/528 Power outlet Running current Power input Auxiliary heater A(kW) — Power factor Fan motor current 0.30 Model RC4V32-AA Winding WHT-BLK 293 "... -
Page 5: Outlines And Dimensions
OUTLINES AND DIMENSIONS MSH-CB50VB Unit: mm INDOOR UNIT Installation plate Indoor unit 1068 414.5 414.5 Wall hole [75 1100 Air in Installation plate Liquid line [ 6.35- 0.5m Gas line [ 12-0.43m Insulation [ 50 O.D [ 32 I.D Drain hose [16 (Connected part O.D) Air out Insulation [28... -
Page 6: Wiring Diagram
WIRING DIAGRAM MSH-CB50VB INDOOR UNIT HIC1 TO OUTDOOR RT12 UNIT CONNECTING CN112 CN201 NR11 SR141 TAB12 POWER SUPPLY CN211 CORD ELECTRONIC CONTROL ~/N 230V RT11 P.C. BOARD 50Hz DISPLAY RECEIVER CIRCUIT BREAKER P.C.BOARD P.C.BOARD REMOTE CONTROLLER SYMBOL SYMBOL NAME NAME SYMBOL NAME INDOOR FAN CAPACITOR... -
Page 7: Service Functions
SERVICE FUNCTIONS MSH-CB50VB 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. The time will be shortened as follows. Set time : 1 minute 1-second Set time : 3 minute 3-second (It takes 3 minutes for the compressor to start operation. - Page 8 How to release “AUTO RESTART FUNCTION” Turn off the main power for the unit. Pull out the electronic control P.C. board, the receiver P.C. board and the display P.C.board. (Refer to 10.2.) Solder jumper wire to JR07 on the indoor electronic control P.C.
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Page 9: Troubleshooting
TROUBLESHOOTING MSH-CB50VB 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 10 9-2. Instruction of troubleshooting Start Indoor unit Indoor unit Indoor unit operates. OPERATION INDICATOR operates. doesn't receive lamp on the indoor unit is Outdoor unit Outdoor unit the signal from doesn't operate flashing on and off. doesn't remote controller. normally. operate.
- Page 11 9-3. Troubleshooting check table • The following indication applies regardless of shape of the indicator. Operation Indicator Lighted Not lighted · 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 12 9-4. Trouble criterion of main parts MSH-CB50VB Part name Check method and criterion Figure Room temperature Measure the resistance with a tester. thermistor(RT11) Refer to 9-6. "Test point diagram and voltage", "Indoor electronic control P.C. Indoor coil thermistor board", the chart of thermistor. (RT12(main), RT13(sub)) Measure the resistance between the terminals with a tester.
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Page 13: A Check Of Indoor Fan Motor
9-5. Troubleshoot flow When OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor doesn’t 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 14: Check Of Indoor Electronic Control P.c. Board
The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by press- ing the EMERGENCY OPERATION switch. Check of indoor electronic control P.C. board Check the both “parts side” and “pattern Varistor (NR11) side” of indoor electronic control P.C. board visually. -
Page 15: How To Check Mis-Wiring
When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. How to check mis-wiring w 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 16 9-6. Test point diagram and voltage MSH-CB50VB Indoor electronic control P.C. board Fan motor power supply Power supply input 230V AC 5V DC Fuse (F11) 250V AC 3.15A Room temperature ther- mistor(RT11) R132 Indoor coil thermistor(RT12(main)) Emergency operation switch Timer short mode point (JPS, JPG) (Refer to 8-1.) Receiver P.C.
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Page 17: 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 18 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 3 Screws of the ground wire (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Disconnect the connector of the indoor coil thermistor. (4) Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C.
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Page 19: Parts List
PARTS LIST MSH-GA50VB 11-1. INDOOR UNIT STRUCTURAL PARTS 11-2. INDOOR UNIT HEAT EXCHANGER Optional parts (See 12.) 11-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MSH-CB50VB - Diagram... -
Page 20: Electrical Parts
MSH-CB50VB 11-4. ACCESSORY AND 11-3. INDOOR UNIT FUNCTIONAL PARTS AND REMOTE CONTROLLER ELECTRICAL PARTS 15 16 11-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MSH-CB50VB -... -
Page 21: Optional Parts
OPTIONAL PARTS AIR CLEANING FILTER AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity. Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible. Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. - 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 Distributed in Dec. 2005. No.OB440 6 Specifications subject to change without notice. Made in Japan...