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Mitsubishi Electric MSZ-GB50VA Service Manual

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See also: Installation Manual
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Wireless type
Models
MSZ-GB50VA -
MSZ-GB50VA
NOTE:
• This service manual describes technical data of the indoor units.
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······································10
10. DISASSEMBLY INSTRUCTIONS·····················24
11. RoHS PARTS LIST···········································27
12. OPTIONAL PARTS···········································30
No. OB454
MUZ-GB·VA series (OB455)
MXZ-A·VA series (OB377)
MXZ-8A140VA (OC316)

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Summary of Contents for Mitsubishi Electric MSZ-GB50VA

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS INDOOR UNIT No. OB454 SERVICE MANUAL Wireless type Models MSZ-GB50VA - Outdoor unit service manual MUZ-GB·VA series (OB455) MXZ-A·VA series (OB377) MXZ-8A140VA (OC316) CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················3 3. SPECIFICATION·················································5 4.

  • Page 2: Technical Changes

    TECHNICAL CHANGES MSZ-GA50VA - MSZ-GB50VA - Indoor unit size has been changed. (W1,100 mm x H325 mm x D258 mm W780 mm x H298 mm x D210 mm)

  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS INDOOR UNIT MSZ-GB50VA Air inlet Heat exchanger Front panel Panel Air cleaning filter (Option) (Anti-Allergy Enzyme Filter,Blue bellows type) Fan guard Catechin air filter Air outlet Vertical vane Horizontal vane Remote controller Line flow fan Display section...

  • Page 4: Remote Controller

    MSZ-GB50VA ACCESSORIES Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 3.5 o 1.6 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping)

  • Page 5: Specification

    SPECIFICATION Indoor model MSZ-GB50VA Function Cooling Heating Single phase Power supply 230V,50Hz Air flow(Super High) K /h Capacity Air flow(High/Med./Low) K /h 654/445/414 Power outlet Running current 0.35 Power input Power factor Fan motor current 0.35 Fan motor Model RC0J30-CC...
  • Page 6 OUTLINES AND DIMENSIONS Unit : mm MSZ-GB50VA 11x26 Oblong hole 11x20 Oblong hole INDOOR UNIT Installation plate Air in Wall hole [65 Indoor unit Installation plate Liquid line [8.0-0.5m Gas line [9.52-0.43m Insulation [35 O.D [19 I.D Drain hose [16 (Connected part O.D)

  • Page 7: Noise Criteria Curves

    NOISE CRITERIA CURVES MSZ-GB50VA FAN SPEED SPL(dB(A)) LINE High Test conditions, Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: Heating : Dry-bulb temperature 20: Wet-bulb temperature 15: NC-70 NC-60 NC-50 NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM MSZ-GB50VA INDOOR UNIT INDOOR ELECTRONIC CONTROL P.C. BOARD RT13 TAB3 230V~ RT12 DB111 T111 TO OUTDOOR UNIT RT11 12-24V NR11 CONNECTING CN201 LD104 CN211 101(A) 105(T) INTERLOCK POWER MONITOR SW P.C. SWITCH(FAN) RECEIVER P.C.BOARD BOARD SYMBOL NAME SYMBOL...

  • Page 9: Service Functions

    SERVICE FUNCTIONS MSZ-GB50VA 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 9-7.) Set time : 1-minute...

  • Page 10: Troubleshooting

    Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current by adding to the system that allows the units to start one by one. TROUBLESHOOTING MSZ-GB50VA 9-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: 1) Check the power supply voltage.
  • Page 11 3. Troubleshooting procedure 1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work. 2) Before servicing check that the connector and terminal are connected properly.
  • Page 12 9-2. Failure mode recall function Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.
  • Page 13 2. Indoor unit failure mode table Left lamp of OPERATION Abnormal point Condition Correspondence INDICATOR lamp (Failure mode) Not lighted Normal – – When the room temperature thermistor short Room temperature Refer to the characteristics of the room 1-time flash or open circuit is detected every 8 thermistor temperature thermistor (9-7.).
  • Page 14 9-3. Instruction of troubleshooting Start Indoor unit Indoor unit Indoor unit operates. OPERATION INDICATOR operates. doesn't receive Outdoor unit doesn't lamp on the indoor unit is Outdoor unit the signal from operate normally. flashing on and off. doesn't remote controller. operate.
  • Page 15 9-4. 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 OPERATION INDICATOR lamp flashing.

  • Page 16: Trouble Criterion Of Main Parts

    2.5-second OFF setting first has the priority. operate. 9-5. Trouble criterion of main parts MSZ-GB50VA Part name Check method and criterion Figure Room temperature Measure the resistance with a tester. thermistor(RT11) Refer to 9-7."Test point diagram and voltage",...

  • Page 17: Troubleshooting Flow

    9-6. Troubleshooting flow When OPERATION INDICATOR lamp flashes 3-time. Indoor fan does not operate. Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan doesn't operate. Turn OFF the power supply. Pay careful attention to the high voltage on the fan motor connector CN211.
  • Page 18 Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller. Check of remote controller and receiver P.C. board wCheck if the remote controller is exclusive for this air conditioner. Switch ON the remote controller. Is LCD display on the the remote Replace the batteries.
  • Page 19 The unit does not operate with the remote controller. Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch. Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Measure the resistance between CN211 3 Short/open circuit: Remove indoor fan motor connector CN211 and and 4 of the indoor fan motor connector.
  • Page 20 • When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch. Indoor unit does not operate. • When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. How to check mis-wiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply.
  • Page 21 When All lamps flash ON and OFF every 0.5-second. Indoor unit and outdoor unit do not operate. Check of installation of the horizontal vane Turn OFF the power supply. Relock the stopper of the Is the stopper of the horizontal vane horizontal vane to the indoor unit.
  • Page 22 Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the Extend the distance between antennas and the indoor the antennas and the indoor unit within 3m, or is the unit, and/or the antennas and distance between the the outdoor unit.
  • Page 23 9-7. Test point diagram and voltage MSZ-GB50VA Indoor electronic control P.C. board Power supply input Varistor (NR11) 230V AC Fuse(F11) Indoor fan motor (CN211) 1325V DC 3(-) Fiducial terminal of cathode side on measur- ing high-voltage DC 415V DC 5(+)3-6V DC...

  • Page 24: Disassembly Instructions

    2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector MSZ-GB50VA INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the panel Photo 1 (1) Remove the horizontal vane. (2) Remove the screw caps of the panel.
  • Page 25 OPERATING PROCEDURE PHOTOS Photo 2 2. Removing the electronic control P.C. board, the power monitor receiver P.C. board, SW P.C. board and the terminal block (1) Remove the horizontal vane, the panel (Refer to 1.) and the corner box. (2) Remove the screw of V.A. clamp, and then the indoor/outdoor connecting wire.
  • Page 26 OPERATING PROCEDURE PHOTOS Photo 5 4. Removing the horizontal vane motor unit (1) Remove the horizontal vane and the panel. (Refer to 1.) (2) Remove the screws of the horizontal vane motor unit, and pull out the horizontal vane motor unit. (See Photo 5.) Screws of the (3) Disconnect the connector from the horizontal vane motor horizontal vane...

  • Page 27: Rohs Parts List

    RoHS PARTS LIST (RoHS compliant) MSZ-GB50VA 11-1. INDOOR UNIT STRUCTURAL PARTS 11-2. ACCESSORY AND REMOTE CONTROLLER Optional parts (Refer to 12-1.) 11-1. INDOOR UNIT STRUCTURAL PARTS Q'ty/unit Symbol MSZ-GB50VA- Part No. Part name in Wiring Remarks Diagram E12 A32 234...
  • Page 28 RoHS PARTS LIST (RoHS compliant) MSZ-GB50VA 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS SW P.C. BOARD POWER MONITOR RECEIVER P.C. BOARD INDOOR ELECTRONIC CONTROL P.C. BOARD 11-4. INDOOR UNIT HEAT EXCHANGER...
  • Page 29 RoHS PARTS LIST (RoHS compliant) 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Q'ty/unit Symbol MSZ-GB50VA- Part No. Part name in Wiring Remarks Diagram E12 751 509 BEARING MOUNT E12 001 504 SLEEVE BEARING E12 897 702 DRAIN HOSE E12 A88 235 NOZZLE ASSEMBLY UP &...

  • Page 30: Optional Parts

    Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. Do not remove or attach AIR CLEANING FILTER during unit operation. Model Part No. MSZ-GB50VA - MAC-415FT-E Replacement of the air cleaning filter (2) Remove the air cleaning filter(Blue (1) Remove the catechin air filter(left one) bellows type) from the catechin air filter.
  • Page 32 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN C C Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Mar. 2006. No. OB454 6 Made in Japan New publication, effective Mar. 2006 Specifications subject to change without notice.

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