OB378_--1qxp 05.1.17 12:55 Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OB378 SERVICE MANUAL Wireless type Models MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA - E1 (WH) E1 (WH) E1 (WH) CONTENTS Indication of model name MSZ-GA22VA - E1 MSZ-GA25VA - E1 MSZ-GA35VA - E1 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················3 3. SPECIFICATION·················································5 4. NOISE CRITERIA CURVES ·······························6 5.
OB378_--1qxp 05.1.17 12:55 Page 2 1 TECHNICAL CHANGES MSZ-A09YV - E1 MSZ-A09YV - E1 MSZ-A12YV - E1 ➔ MSZ-GA22VA - E1 ➔ MSZ-GA25VA - E1 ➔ MSZ-GA35VA - E1 1. Indication of capacity has been changed.(BTU base ➔kW base) 2. Control method between indoor and outdoor has been changed. 3. Power supply method has been changed (change to supply from outdoor unit). 4. Power supply cord has been removed. 5. Indoor electronic control P.C. board has been changed. 6. Position of terminal block has been changed. 7.
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OB378_--1qxp 05.1.17 12:55 Page 4 ACCESSORIES MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA - INDOOR UNIT 1 Installation plate 1 2 Installation plate fixing screw 4 o 25 mm 5 3 Remote controller holder 1 4 Fixing screw for 3 3.5 o 1.
OB378_--1qxp 05.1.17 12:55 Page 5 3 SPECIFICATION Indoor model MSZ-GA22VA - MSZ-GA25VA - E1 MSZ-GA35VA - E1 E1 Cooling Cooling Cooling Heating Heating Heating Single phase Single phase Single phase Power supply 230V,50Hz 230V,50Hz 230V,50Hz Air flow(Super High) 600 K /h 600 630 600 630 630 Capacity Air flow(HighW/Med.W/LowW) K /h 480W/366W/234W 504W/384W/258W 480W/366W/234W 504W/384W/258W 480W/366W/246W 504W/384W/270W Power outlet A 10 10 10 Running current ✽1 A 0.25 0.25 0.
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OB378_--1qxp 05.1.17 12:55 Page 7 OUTLINES AND DIMENSIONS Unit : mm MSZ-GA22VA - E1 MSZ-GA25VA - E1 MSZ-GA35VA - E1 225 335 55 320 102 5 Installation plate { Liquid line [6.35-0.5m Gas line [9.52-0.43m Insulation [35 O.D [19 I.D Drain hose [16 (Connected part O.D) 90 Insulation [28 106 19 3 Wall hole [65 7 or more 100 298 Required space (Indoor unit) 7 75 or more 66 or moreW 75 or more left under piping (using spacer), 115 or more Air out 10 or more 159 70 Air in 210 624.
OB378_--1qxp 05.1.17 12:55 Page 8 6 WIRING DIAGRAM MSZ-GA22VA - E1 MSZ-GA25VA - E1 MSZ-GA35VA - E1 INDOOR UNIT MODELS WIRING DIAGRAM 230V~ TO OUTDOOR UNIT CONNECTING TB S1 BLK S2 BLU RED S3 12-24V TAB3 INDOOR ELECTRONIC CONTROL P.C.
OB378_--1qxp 05.1.17 12:55 Page 9 8 SERVICE FUNCTIONS MSZ-GA22VA - E1 MSZ-GA25VA - E1 MSZ-GA35VA - E1 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 ➔ 1-second Set time : 3-minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS.) 8-2. P.C.
OB378_--1qxp 05.1.17 12:55 Page 10 8-3. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION” sets to work the moment power has restored after power failure. Then, the unit will restart automatically. Operation 1 If the main power has been cut, the operation settings remain.
OB378_--1qxp 05.1.17 12:55 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. 3) If the electronic control P.C.
OB378_--1qxp 05.1.17 12:55 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 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. 1.
OB378_--1qxp 05.1.17 12:55 Page 13 2. Indoor unit failure mode table NOTE:Blinking patterns of this mode differs from the ones of Troubleshooting check table(9-4.). Left lamp of OPERATION INDICATOR lamp Abnormal point (Failure mode) Not lighted Normal Detection method Check point – – 1-time flash every 0.5-second Room temperature thermistor When the room temperature thermistor short or open circuit is detected every 8 seconds during operation. 2-time flash 2.
OB378_--1qxp 05.1.17 12:55 Page 14 9-3. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate. Indoor unit operates. Outdoor unit doesn't operate normally. Indoor unit doesn't receive the signal from remote controller. Outdoor unit operates in only Test Run operation. w1 Outdoor unit doesn't operate even in Test Run operation. w1 Unit doesn't operate normal operation in COOL or HEAT mode. Indoor unit operates, when EMERGENCY OPERATION switch is pressed.
OB378_--1qxp 05.1.17 12:55 Page 15 9-4. Troubleshooting check table Lighted OPERATION INDICATOR · Flashing of OPERATION INDICATOR lamp (left-hand side lamp) indicates abnormalities. Blinking Not lighted NOTE : Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table No. Abnormal point 1 Mis-Wiring or serial signal Operation indicator lamp Left lamp flashes. 0.
OB378_--1qxp 05.1.17 12:55 Page 16 Lighted OPERATION INDICATOR · Flashing of OPERATION INDICATOR lamp (all lamps) indicates abnormality. Blinking Not lighted NOTE : Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table No. Abnormal point Operation indicator lamp Symptom All lamps flash at the same time. Attachment 0.5-second ON of the 1 horizontal vane 0.5-second OFF OPERATION INDICATOR Lighted Blinking Not lighted No.
OB378_--1qxp 05.1.17 12:55 Page 17 9-6. Troubleshooting flow When OPERATION INDICATOR lamp flashes 3-time. Indoor fan does not operate. A Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan doesn't operate. Turn OFF the power supply. Insert a stick such as a screw driver into the air outlet, and check if there is any catch in the rotation of the line flow fan.
OB378_--1qxp 05.1.17 12:55 Page 18 Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller. B 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 controller visible? No Replace the batteries. (Refer to 9-1.4.) (not clear) Yes Remove the batteries, then set them back and press RESET button. (Refer to 9-1.4.
OB378_--1qxp 05.1.17 12:55 Page 19 The unit does not operate with the remote controller. Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch. C Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply. Measure the resistance between CN211 3 and 4 of the indoor fan motor connector.
OB378_--1qxp 05.1.17 12:55 Page 20 When POWER lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. D How to check mis-wiring and serial signal error Turn OFF the power supply. Is there rated voltage of 230V AC in the power supply? No Check the power supply. Yes Turn ON the power supply. Is there 230V AC between outdoor terminal block S1 and S2? No Check the wiring. Yes Press EMERGENCY OPERATION switch.
OB378_--1qxp 05.1.17 12:55 Page 21 When All lamps flash ON and OFF every 0.5-second. Indoor unit and outdoor unit do not operate. E Check of installation of the horizontal vane Start Turn OFF the power supply. Is the stopper of the horizontal vane locked to the indoor unit correctly? No Relock the stopper of the horizontal vane to the indoor unit. Refer to 9-1.5. Yes Turn ON the power supply.
OB378_--1qxp 05.1.17 12:55 Page 22 F Electromagnetic noise enters into TV sets or radios No Is the unit earthed? Earth the unit. Yes Is the distance between the antennas and the indoor unit within 3m, or is the distance between the antennas and the outdoor unit within 3m? Yes Extend the distance between the antennas and the indoor unit, or the antennas and the outdoor unit.
OB378_--1qxp 05.1.17 12:55 Page 23 9-7. Test point diagram and voltage MSZ-GA22VA - E1 MSZ-GA25VA - E1 MSZ-GA35VA - E1 Indoor electronic control P.C. board Power supply input 230V AC Fuse(F11) } Varistor (NR11) Indoor fan motor (CN211) 1311V DC 3(-) Fiducial terminal of cathode side on measuring high-voltage DC 415V DC 5(+)3-6V DC 6(+)0V DC or 15V DC Release of Auto restart function Solder the Jumper wire to JR07. (Refer to 8-3.
OB378_--1qxp 05.1.17 12:55 Page 24 10 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. (1) Slide the sleeve and check if there is a locking lever or not.
OB378_--1qxp 05.1.17 12:55 Page 25 OPERATING PROCEDURE PHOTOS 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. (See Photo 2.) (3) Remove the switch holder from the electrical cover. (See Photo 3.) (4) Remove the screw of the electrical cover, and then the electrical cover.
OB378_--1qxp 05.1.17 12:55 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.) (3) Disconnect the connector from the horizontal vane motor unit. 5. Removing the indoor fan motor and the line flow fan (1) Remove the horizontal vane, the panel (Refer to 1.) and the corner box.
OB378_--1qxp 05.1.17 12:55 Page 27 11 PARTS LIST MSZ-GA22VA MSZ-GA25VA MSZ-GA35VA 11-1. INDOOR - E1 (WH) - E1 (WH) - E1 (WH) UNIT STRUCTURAL PARTS 11-2. ACCESSORY AND REMOTE CONTROLLER 1 11 10 9 8 2 7 (See 12.) 3 4 5 6 11-1. INDOOR UNIT STRUCTURAL PARTS No. 1 2 3 4 5 6 7 8 9 Part No.
OB378_--1qxp 05.1.17 12:55 Page 28 MSZ-GA22VA - E1 (WH) MSZ-GA25VA - E1 (WH) MSZ-GA35VA - E1 (WH) 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 21 20 19 17 18 1 2 3 4 5 INTERLOCK SWITCH (FAN) 6 7 14 15 SW P.C. BOARD 13 POWER MONITOR RECEIVER P.C. BOARD 12 15 11 10 9 VARISTOR 8 15 16 FUSE ROOM TEMPERATURE THERMISTOR 11-4.
OB378_--1qxp 05.1.17 12:55 Page 29 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Part No.
OB378_--1qxp 05.1.17 12:55 Page 30 12 OPTIONAL PARTS AIR CLEANING FILTER (ANTI-ALLERGY ENZYME 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 1 year. If AIR CLEANING FILTER is to be washed, soak AIR CLEANING FILTER in water (when showing dirt, in lukewarm water) and rinse it delicately, without removing the filter from the frame about once every 3 months.
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OB378_--1qxp 05.1.17 12:55 Page 32 HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jan. 2005. No. OB378 6 Made in Japan New publication, effective Jan. 2005 Specifications subject to change without notice.
