SPLIT-TYPE, AIR CONDITIONERS SERVICE MANUAL Wireless type Models MS-GA50VB - MS-GA60VB - MS-GA80VB - E E E (WH) (WH) (WH). OB69 CONTENTS Indication of model name MS-GA50VB - E MS-GA60VB - E MS-GA80VB - E. TECHNICAL CHANGES. PART NAMES AND FUNCTIONS. SPECIFICATION. NOISE CRITERIA CURVES 5 5. OUTLINES AND DIMENSIONS 6 6. WIRING DIAGRAM 7 7. REFRIGERANT SYSTEM DIAGRAM 8 8. SERVICE FUNCTIONS 9 9. TROUBLESHOOTING 0. DISASSEMBLY INSTRUCTIONS 9. PARTS LIST. OPTIONAL PARTS NOTE: This service manual describes technical data of the indoor units. As for outdoor units MU-GA50VB - E, MU-GA60VB - E and MU-GA80VB - E, refer to service manual OB70.
TECHNICAL CHANGES MS-A8WV - E MS-GA50VB - MS-AWV - E MS-GA60VB - MS-A0WV - E MS-GA80VB - E E E. Model name has been changed. Indication of capacity has been changed. (BTU kw). Grille design has been changed.. Unit size has been changed.(w,00aoh 5aoD 7a W,00aoH 5aoD 58a) PART NAMES AND FUNCTIONS INDOOR UNIT MS-GA50VB - E MS-GA60VB - E MS-GA80VB - E Air cleaning filter (option) (White bellows type) Front panel Catechin air filter Vertical vanes Horizontal vane Grille Air inlet To Breaker Power supply cord Remote control receiving section Remote controller Operation section (When the grille is opened) Display section Operation indicator lamp Emergency operation switch Remote control receiving section ACCESSORIES Indoor unit 5 6 7 Installation plate Installation plate fixing screw o 5 mm Remote controller holder Fixing screw for o.5 o.6 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) MS-GA50VB - MS-GA60VB - MS-GA80VB - 7 E E E
REMOTE CONTROLLER MS-GA50VB - E MS-GA60VB - E MS-GA80VB - E Signal transmitting section Operation display section PM OPERATE/ STOP (ON/ OFF)button ON/OFF TOO WARM AM TOO COOL TEMPERATURE buttons Open the front lid. Indication of remote controller model is on back. CLOCK PM AM ON/OFF TOO WARM TOO COOL VANE button (Horizontal vane button) OPERATION SELECT button ECONO COOL button WIDE VANE button (Vertical vane button) I FEEL COOL FAN DRY MODE ECONO COOL FAN VANE WIDE VANE LONG RESET CLOCK STOP START HR. MIN. FAN SPEED CONTROL button OFF-TIMER button ON-TIMER button HR. button MIN. button (TIME SET button) CLOCK SET button LONG button RESET button
SPECIFICATION Indoor model Function MS-GA50VB - E Cooling Single phase MS-GA60VB - E Cooling Single phase Power supply Capacity Air flow(high/med. w/low w) Power outlet Running current Power input Auxiliary heater Power factor Fan motor current Model K /h A A W A(kW) % A 0V, 50Hz 768/6 w/58w 0 0.0 60 87 0.0 RCV-AA 0V, 50Hz 768/67 w/588w 0 0.0 60 87 0.0 RCV-AA Winding WHT-BLK 9 " WHT-BLK 9 resistance(at 0:) BLK-RED 6 BLK-RED 6 Dimensions WOHOD Weight Air direction Sound level(high/med. w/low w) Fan speed(high/med. w/low w) Fan speed regulator Thermistor RT(at 5:) Thermistor RT(at 5:) Remote controller model mm kg db rpm k" k",00o5o58 6 5 /8 w/ w,070/90 w/780 w 0 0 KM0B,00O5O58 6 5 5/ w/7w,070/960 w/850 w 0 0 KM0B Electrical data Fan motor Special remarks Indoor model Function Power supply Capacity Air flow(high/med. w/low w) Power outlet Running current Power input Auxiliary heater Power factor Fan motor current Model K /h A A W A(kW) % A 960/8 w/68 w 0 0. 69 88 0. RCV0-AA Winding WHT-BLK 8. " resistance(at 0:) BLK-RED 59.0 Dimensions WOHOD Weight Air direction Sound level(high/med. w/low w ) mm kg db,00o5o58 6 5 7/ w /7 w Electrical data Fan motor Special remarks NOTE: Test conditions are based on ISO 55. Cooling : Indoor DB7 C WB9 C Outdoor DB5 C WB( C) Indoor-Outdoor piping length : 5m w Reference value MS-GA80VB - E Cooling Single phase 0V, 50Hz Fan speed(high/med. w/low w ) Fan speed regulator Thermistor RT(at 5:) Thermistor RT(at 5:) Thermistor RT(at 5:) Remote controller model rpm k" k" k",80/,0 w/970 w 0 0 0 KM0B
NOISE CRITERIA CURVES MS-GA50VB - E MS-GA60VB - E FAN SPEED SPL(dB(A)) LINE FAN SPEED SPL(dB(A)) LINE High High 5 OCTAVE BAND SOUND PRESSURE LEVEL, db re 0.000 MICRO BAR Test conditions, Cooling : Dry-bulb temperature 7: Wet-bulb temperature 9: 90 80 70 60 50 0 0 0 0 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE MS-GA80VB - E 6 5 50 500 000 000 000 8000 BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-0 NC-0 NC-0 OCTAVE BAND SOUND PRESSURE LEVEL, db re 0.000 MICRO BAR Test conditions, Cooling : Dry-bulb temperature 7: Wet-bulb temperature 9: 90 80 70 60 50 0 0 0 0 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 6 5 50 500 000 000 000 8000 BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-0 NC-0 NC-0 FAN SPEED SPL(dB(A)) LINE High 7 OCTAVE BAND SOUND PRESSURE LEVEL, db re 0.000 MICRO BAR Test conditions, Cooling : Dry-bulb temperature 7: Wet-bulb temperature 9: 90 80 70 60 50 0 0 0 0 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 6 5 50 500 000 000 000 8000 BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-0 NC-0 NC-0 5 INDOORUNIT m 0.8m MICROPHONE WALL
5 OUTLINES AND DIMENSIONS MS-GA50VB - E MS-GA60VB - E MS-GA80VB - E Unit: mm INDOOR UNIT Installation plate Indoor unit 98 7 7.5 068 55.5 5 7 98.5.5 7.5 7 5 56 6 58 00 79 9 5 Air in Power supply cord Lead to right.0m Lead to left.0m Air out 58 Wall hole [75 5 Installation plate Drain hose [6 (Connected part O.D) Insulation [8 { Liquid line [ 6.5-0.5m Gas line [ -0.m Insulation [ 50 O.D [ I.D for MS-GA50VB { Liquid line [ 9.5-0.5m Gas line [ -0.m Insulation [ 50 O.D [ I.D for MS-GA60/GA80VB Wireless remote controller 6
6 WIRING DIAGRAM MS-GA50VB - E MS-GA60VB - E INDOOR UNIT MODELS WIRING DIAGRAM TO OUTDOOR UNIT CONNECTING TB PE V POWER SUPPLY CORD ~/N 0V 50Hz CIRCUIT BREAKER N L BRN BLU GRN/YLW BLK WHT BLU BRN MV CN 5 MV 5 MV CN 0 CN0 CN0 TAB DISPLAY P. C. BOARD CN 0 HIC F NR C SR ELECTRONIC CONTROL P. C. BOARD RECEIVER P. C. BOARD REMOTE CONTROLLER CN CN CN CN RT BLK GRY YLW BRN WHT RED 5 6 RT MF SYMBOL C F HIC MF NAME INDOOR FAN CAPACITOR FUSE (.5A) DC/DC CONVERTER INDOOR FAN MOTOR (INNER FUSE) SYMBOL MV MV NR RT NAME VANE MOTOR (HORIZONTAL) VANE MOTOR (VERTICAL) VARISTOR ROOM TEMPERATURE THERMISTOR SYMBOL RT SR TB NAME INDOOR COIL THERMISTOR SOLID STATE RELAY TERMINAL BLOCK NOTES:.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring).symbols below indicate. : Terminal block : Connector MS-GA80VB - E INDOOR UNIT PE TO OUTDOOR UNIT CONNECTING V SYMBOL C F HIC MF MV POWER SUPPLY CORD ~/N 0V 50Hz CIRCUIT BREAKER TB N L BRN BLU GRN/YLW RED BLU BRN MV CN 5 MV MODEL WIRING DIAGRAM 5 MV CN 0 CN0 TAB DISPLAY P. C. BOARD 7 CN 0 HIC F NR C SR ELECTRONIC CONTROL P. C. BOARD RECEIVER P. C. BOARD NOTES:.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring).symbols below indicate. : Terminal block : Connector REMOTE CONTROLLER CN CN CN CN RT RT BLK GRY YLW BRN WHT RED NAME INDOOR FAN CAPACITOR FUSE(.5A) DC/DC CONVERTER INDOOR FAN MOTOR(INNER PROTECTOR) VANE MOTOR(HORIZONTAL) SYMBOL MV NR RT RT RT NAME VANE MOTOR(VERTICAL) VARISTOR ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR (MAIN) INDOOR COIL THERMISTOR (SUB) SYMBOL SR TB NAME SOLID STATE RELAY TERMINAL BLOCK RT MF
7 REFRIGERANT SYSTEM DIAGRAM MS-GA50VB - E MS-GA60VB - E Unit:mm INDOOR UNIT Refrigerant pipe [.7 (with heat insulator) INDOOR UNIT Refrigerant pipe [5.88 (with heat insulator) Indoor heat exchanger Indoor coil RT Distributor Flared connection Indoor heat exchanger Indoor coil RT Distributor Flared connection Room temperature RT Room temperature RT Flared connection Flared connection Refrigerant pipe [6.5 (with heat insulator) Refrigerant pipe [6.5 (with heat insulator) MS-GA80VB - E INDOOR UNIT Refrigerant pipe [5.88 (with heat insulator) Indoor heat exchanger Indoor coil RT(main) Flared connection Indoor coil RT(sub) Room temperature RT Strainer #50 Flared connection Refrigerant pipe [9.5 (with heat insulator) Refrigerant flow in cooling 8
8 SERVICE FUNCTIONS MS-GA50VB - E MS-GA60VB - E MS-GA80VB - E 8-. 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 : minute -second Set time : minute -second (It takes minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS.) 8-. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of indoor units with wireless remote controllers can be used in a room. In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be modified according to the number of the indoor unit. How to modify the remote controller P.C. board Remove batteries before modification. The board has a print as shown below : Remote controller model : KM0B J J NOTE : For remodelling, take out the batteries and press the OPERATE/STOP(ON/OFF)button twice or times at first. After finish remodelling, put back the batteries then press the RESET button. The P.C. board has the print J and J. Solder J and J according to the number of indoor unit as shown in Table. After modification, press the RESET button. Table. unit. unit. unit. unit unit operation modification units operation Same as at left Solder J units operation Same as at left Same as at left Solder J units operation Same as at left Same as at left Same as at left Solder both J and J How to set the remote controller exclusively for particular indoor unit After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit. The indoor unit will only accepts the signal from the remote controller that has been assigned to the indoor unit once they are set. The setting will be cancelled if the breaker has turned off, or the power supply has shut down. Please conduct the above setting once again after the power has restored. 9
8-. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, 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. However if the unit is operated in I FEEL CON- TROL mode before power failure, the operation is not memorized. In I FEEL CONTROL mode, the operation is decided by the initial room temperature. 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 page 9.) Solder jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to page 8.) CN0 C CN TAB RA0 CN5 CN CN SW CN IC0 IC5 JR07 Operation If the main power has been cut, the operation settings remain. After the power is restored, the unit restarts automatically according to the memory.(however, it takes at least minutes for the compressor to start running.) NOTE The operation settings are memorized when 0 seconds have passed after the remote controller was operated with the remote controller. If main power is turned off or a power failure occurs while AUTO START/STOP timer is active,the timer setting is cancelled. If the unit has been off with the remote controller before power failure, the auto restart function does not work as the power button of the remote controller is off. To prevent breaker off due to the rush of starting current, systematize other home appliances not to turn on at the same time. When some air conditioners are connected to the same supply system, if they are operated before power failure, the starting current of all the compressors may flow simultaneously at restart. 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. 0
FAN FAN 9 TROUBLESHOOTING MS-GA50VB - E MS-GA60VB - E MS-GA80VB - E 9-. Cautions on troubleshooting. Before troubleshooting, check the following: () Check the power supply voltage. () Check the indoor/outdoor connecting wire for mis-wiring.. Take care the following during servicing. () Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug. () Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. () When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. () When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Lead wiring Housing point. Troubleshooting procedure () 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. () Before servicing check that the connector and terminal are connected properly. () If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discolouration. () When troubleshooting, refer to 9-. and 9-... How to replace batteries Weak batteries may cause the remote controller malfunction. In this case, replace the batteries to operate the remote controller normally. Remove the front lid and insert batteries. Then reattach the front lid. Press the RESET button with tip end of ball point pen or the like, and then use the remote controller. Insert the negative pole of the batteries first. Check if the polarity of the batteries are correct. RESET button NOTE : If the RESET button is not pressed, the remote controller may not operate correctly.
9-. Instruction of troubleshooting Start Indoor unit operates. doesn't operate. Indoor unit operates. doesn't operate normally. Indoor unit doesn't receive the signal from remote controller. OPERATION INDICATOR lamp on the indoor unit is flashing on and off. operates in only Test Run operation. doesn't operate even in Test Run operation. doesn't stop even if indoor unit stops. Indoor unit operates, when the EMERGENCY OPERATION switch is pressed. Indoor unit doesn't operate, when the EMERGENCY OPERATION switch is pressed. Check room temperature. Refer to 9-6. "Test point diagram and voltage". Refer to "Check of outdoor unit". Refer to "Check of outdoor unit". Refer to 9-5. B "Check of remote controller and receiver P.C. board".. Check indoor / outdoor connecting wire.. Refer to 9-5. C "Check of indoor electronic control P.C. board". MS-GA80VB Flash on and off at 0.5- second intervals Cause: Indoor/ Mis-wiring -time flash Cause: Indoor unit Trouble of room temperature/ indoor coil -time flash Cause: Indoor unit Trouble of indoor fan motor -time flash Cause: Indoor unit Trouble of indoor unit control system MU-GA80VB 6-time flash Cause: Trouble of in outdoor unit MU-GA80VB 7-time flash Cause: Trouble of outdoor control system MU-GA80VB 0-time flash Cause: Trouble of low discharge temperature protection Refer to 9-5. D "How to check mis-wiring (When outdoor unit doesn't work)". Check room temperature and indoor coil. Refer to 9-6. "Test point diagram and voltage". Refer to 9-5. A "Check of indoor fan motor". Replace the indoor electronic control P.C. board. Refer to "Check of outdoor ". Replace the deicer P.C. board. Refer to "Check of LEV". As for outdoor unit, refer to service manual OB70.
9-. Troubleshooting check table The following indication applies regardless of shape of the indicator. Operation Indicator Lighted t 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 lighted during normal operation. Before taking measures, make sure that the symptom reappears, for accurate troubleshooting. Self check table. Abnormal point MS-GA80VB Mis-Wiring Indoor coil Room temperature Operation indicator lamp Symptom Detection method Checkpoint 0.5-second ON 0.5-second OFF -time flash.5-second OFF does not operate. does not operate. minutes after power supply turns ON, when serial signal is not received. Detect Indoor coil/room temperature short or open circuit every 8 seconds during operation. Refer to 9-5. D "How to check mis-wiring ". Refer to the characteristics of main indoor coil, sub indoor coil, and room temperature on page 8. Indoor fan motor -time flash.5-second OFF Indoor fan repeats seconds ON and minutes OFF. When the indoor fan breaks, the fan keeps stopping. When rotational frequency feedback signal is not emitting during -second indoor fan operation. Refer to 9-5. A "Check of indoor fan motor". Indoor control system -time flash.5-second OFF does not operate. When it cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board. Check the indoor electronic control P.C. board. 5 MU-GA80VB Outdoor 6-time flash.5-second OFF does not operate. <Thermistor short> Thermistors are abnormal when they short after compressor start-up. <Thermistor open> Thermistors are abnormal when they open after compressor start-up. However, discharge temperature is abnormal when open circuit is detected more than 0 minutes after compressor start-up. Check the deicer P.C. board. Reconnect the connector. Refer to "Check of outdoor ". Refer to service manual OB70. 6 MU-GA80VB Outdoor control system 7-time flash.5-second OFF does not operate. When it cannot properly read data in the nonvolatile memory of the deicer P.C. board, outdoor unit stops. Check the deicer P.C. board. Refer to service manual OB70. 7 MU-GA80VB Low discharge temperature protection 0-time flash.5-second OFF does not operate. When discharge temperature has been 50: or less on cool operation. Refer to "Check of LEV". Check refrigerant circuit and refrigerant amount. Refer to service manual OB70. NOTE : When the indoor unit has started operation and the above 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.
9-. Trouble criterion of main parts MS-GA50VB - E MS-GA60VB - E MS-GA80VB - E Part name Room temperature (RT) Indoor coil (RT(main), RT(sub)) Indoor fan motor(mf) MS-GA50/GA60VB INNER FUSE 5: CUT OFF MS-GA80VB INNER PROTECTOR 5i 5: OPEN Measure the resistance with a tester. (Part temperature 0 C ~ 0 C) Motor part Sensor part rmal 8 k" ~ 0 k" Color of lead wire WHT BLK BLK RED Check method and criterion Abnormal Open or short-circuit Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 0 C) MS-GA50/GA60VB 8 " ~ 05 " " ~ 5 " rmal MS-GA80VB " ~ " 5 " ~ 65 " Measure the voltage power ON. Color of lead wire rmal BRN YLW.5 ~ 5.5V (When fan revolved one time) YLW GRY 0V 5V 0V (Approx.) Abnormal Open or short-circuit Abnormal Remain 0V or 5V BLK Figure MS-GA50/GA60VB FUSE BLK MAIN AUX BRN YLW GRY BRN YLW GRY RED WHT MS-GA80VB P MAIN AUX. RED WHT Horizontal vane motor(mv) Vertical vane motor(mv) Measure the resistance between the terminal with a tester. (Part temperature 0 C ~ 0 C) rmal 8 " ~ 06 " Abnormal Open or short-circuit RED YLW BRN ROTOR ORN GRN P :INNER PROTECTOR
9-5. Troubleshoot flow When OPERATION INDICATOR lamp flashes -time. Indoor fan motor doesn t operate. A Check of indoor fan motor Turn OFF the power supply. Check connector CN visually. Are lead wires connected? Is soldered point of the connector correctly soldered? Resolder it. Reconnect the lead wires. Disconnect lead wires from connector CN on the indoor electronic control P.C. board. Measure resistance between lead wires. and. and then. and.. Is resistance 0 (short circuit) or (open circuit)? ( 0 or ) (others) Turn ON the power supply. Stop it if the unit operate. Insert screwdriver into air outlet to rotate indoor fan motor slowly for revolution or over, and measure voltage between.(+) and.(-) on CN. Repair or replace the indoor fan motor. Does voltage repeat 0V DC and 5V DC? Replace the indoor electronic control P.C. board. Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn t operate with the remote controller. B Check of remote controller and receiver P.C. board w Check if the remote controller is exclusive for this air conditioner. Switch on the remote controller. Is LCD display on the the remote controller visible? (not clear) Replace the batteries.(refer to page.) Remove the batteries, then set them back and press the RESET button. Check if the unit operates with the remote controller. Does the unit operate with the remote controller? Turn on a radio to AM and press switch on the remote controller. OK Is noise heard from radio? Replace the remote controller. Are there any fluorescent lights of inverter or rapid-start type within the range of m? Reinstall the unit away from lights. Attach a filter on receiving part. Measure the voltage between receiver P.C. board connector CN0.(+) and.(-) when the remote controller button is pressed. Is the voltage approx. V DC? (5V or 0V DC) Replace the indoor electronic control P.C. board. Replace the receiver P.C. board. 5
The unit doesn t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn t light up by pressing the EMERGENCY OPERATION switch. C Check of indoor electronic control P.C. board Check the both parts side and pattern side of indoor electronic control P.C. board visually. Varistor (NR) Turn OFF the power supply. Remove indoor fan motor connector CN and vane motor connector CN5 from the indoor electronic control P.C. board and turn ON the power supply. Fuse (F) Does the unit operate with the remote controller? Does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch? Indoor electronic control P.C. board Turn OFF the power supply. Replace the vane motor. Turn OFF the power supply. Replace the fuse. Is winding resistance of vane motor 0 "? Is fuse(f) blown? Is winding resistance of fan motor 0 "? Replace the fan motor. Is varistor(nr) burnt? Replace the varistor. Replace the indoor electronic control P.C. board. 6
When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. doesn t operate. D How to check mis-wiring MS-GA80VB w Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self -check to be displayed in seconds. Start Turn ON the power supply. (indoor/ outdoor unit) Press once EMERGENCY OPERATION switch. After minutes, mis-wiring is indicated (0.5-second ON, 0.5-second OFF) on OPERATION INDICATOR lamp on indoor unit.w Make them sure. Is this mis-wiring, poor contact, or wire disconnection?. Turn OFF the power supply (indoor/ outdoor unit) and disconnect indoor and outdoor connecting wire at the terminal block of the indoor unit.. Short-circuit terminal block N- of indoor unit by lead wire.. Turn ON the power supply (indoor unit) and press once EMERGENCY OPERATION switch. Is there 0V DC between both ends of R on the indoor electronic control P.C. board? ( By tester, the stylus is between 0 ~ 0V. ) Turn OFF the power supply. (indoor unit) Disconnect the lead wire that terminal block N- of the indoor unit is short-circuited. Connect ON indoor/ outdoor connecting wire. Replace the indoor electronic control P.C. board. Turn ON the power supply. (outdoor unit) Is there 0V AC between L-N on the outdoor terminal block? Check the outdoor power supply and connection of wiring. Is there 5V DC between J0 + -J0 - (MU-GA80VB) on the deicer P.C. board? During EMERGENCY OPERATION, is there 0V DC between both ends of R60 on the deicer P.C. board? (By tester, the stylus is between 5 ~0V.) Replace the deicer P.C. board. Replace the deicer P.C. board. Make the wiring between CN70 on the deicer P.C. board and outdoor terminal block correct. As for outdoor unit, refer to service manual OB70. 7
9-6. Test point diagram and voltage MS-GA50VB - E MS-GA60VB - E MS-GA80VB - Indoor electronic control P.C. board E Fan motor power supply } Power supply input 0V AC + } 5V DC Fuse (F) 50V AC.5A R Room temperature (RT) Indoor coil (RT(main)) MS-GA80VB Indoor coil (RT(sub)) Emergency operation switch Timer short mode point (JPS, JPG) (Refer to page 9.) Receiver P.C. board + } V DC Indoor coil (RT(main), RT(sub)) Room temperature (RT) Release of Auto restart function Solder jumper wire to JR07. (Refer to page 0.) Resistance(k") 8
0 DISASSEMBLY INSTRUCTIONS <"Terminal with lock mechanism" Detaching points> In case of terminal with lock mechanism, detach the terminal as shown below. There are two types ( Refer to () and ()) of the terminal with lock mechanism. The terminal with no lock mechanism can be removed by pulling it out. Check the shape of the terminal and work. () Slide the sleeve and check if there is a locking lever or not. () The terminal with this connector is a terminal with lock mechanism Sleeve Locking lever Slide the sleeve. Pull the terminal while pushing the locking lever. Connector Hold the sleeve, and pull out the terminal slowly. MS-GA50VB - E MS-GA60VB - E MS-GA80VB - INDOOR UNIT OPERATING PROCEDURE. Removing the front panel () Remove the screw caps of the front panel. Remove the screws. () Pull the panel down to your side slightly and unhook the catches at the top. E Photo PHOTOS Front panel Screws. Removing the electronic control P.C. board, the receiver P.C. board and the display P.C. board () Remove the front panel. (Refer to.) () Remove the screw of the electrical cover. Remove the electrical cover. () Remove the screws of the V.A. clamp. Remove the V.A. clamp. () Remove the screw of the terminal block. (5) Remove the screws of the ground wire. (6) Disconnect all the connectors and all the lead wires on the electronic control P.C. board. (7) Remove the R.L holder. (8) Remove the electronic control P.C. board. (9) Open the R.L holder, remove the receiver P.C. board and the display P.C. board. Photo Screws of the ground wire R.L holder Screw of the terminal block Receiver P.C. board Fan motor connectors Vane motor connector Indoor electronic control P.C. board Screw of the electrical cover Screw of the V.A. clamp 9
OPERATING PROCEDURE. Removing the electrical box () Remove the front panel. (Refer to.) () Remove the electrical cover. (Refer to.) () Disconnect the connector of the indoor coil. () Disconnect the motor connector (CN and CN) and the vane motor connector (CN5) on the electronic control P.C. board. (5) Remove the screws of ground wire. (6) Remove the fan motor lead wire and indoor coil from the electrical box. (7) Remove the lead wire of vane motor from the bottom of electrical box. (8) Remove the screw fixing the electrical box and remove the electrical box. Photo PHOTOS Screws of the ground wire Screw of the electrical cover Screw of the electrical box. Removing the vane motor () Remove the front panel. (Refer to.) () Remove the electrical cover. (Refer to.) () Remove the lead wire of vane motor. (Refer to.) () Remove the R.L. holder. (5) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly. (6) Remove the screws of the vane motor and disconnect the connector. (7) Remove the vane motor. Photo 5 Screws of the vane motor Photo Vane motors Screws of the vane motor Vane motor 5. Removing the line flow fan and the indoor fan motor () Remove the front panel. (Refer to.) () Remove the electrical box. (Refer to.) () Pull out the drain hose from the nozzle assembly and remove the nozzle assembly. () Remove the water cut. (5) Slide the hole cover and remove the hole cover. (6) Remove the hexagon socket set screw from the line flow fan. (7) Remove the screws fixing the fan motor and remove the fan motor. (Be careful not to drop the fan motor because it is heavy.) (8) Remove the screws fixing the left side of the heat exchanger. (9) Lift the left side of the heat exchanger. (0) Remove the line flow fan. Photo 8 Hole cover Photo 6 Screws fixing the left side of the heat exchanger Photo 7 Indoor coil Water cut Screws fixing the fan motor 0
PARTS LIST MS-GA50VB - E (WH) MS-GA60VB - E (WH) MS-GA80VB - E (WH) -. INDOOR UNIT STRUCTURAL PARTS -. INDOOR UNIT HEAT EXCHANGER CATCH 5 SCREW CAP 8 Optional parts (See page.) 0 6 7 -. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration.. 5 6 7 8 9 Part. E0 57 970 E0 685 E0 888 000 E0 08 E0 685 067 E0 888 00 E0 5 00 E0 685 975 E0 89 007 Part Name INSTALLATION PLATE BOX (WH) FRONT PANEL ASSEMBLY(WH) CATCH SCREW CAP (WH) GRILLE (WH) CATECHIN AIR FILTER CORNER BOX RIGHT LAMP PANEL Symbol in Wiring Diagram MS-GA50 VB - E (WH) Q'ty/unit MS-GA60 VB - E (WH) MS-GA80 VB - E (WH) Remarks Including.,5,6 PCS/ SET PCS/ SET -. INDOOR UNIT HEAT EXCHANGER 0 E0 89 60 E0 89 60 E0 79 667 E0 8 666 E0 5 667 E0 57 667 INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION (GAS) UNION (GAS) UNION (LIQUID) UNION (LIQUID) {.7 {5.88 {6.5 {9.5
MS-GA50VB - MS-GA60VB - MS-GA80VB - E E E (WH) (WH) (WH) -. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS SLEEVE BEARING 5 6 0 8 9 ROOM TEMPERATURE THERMISTOR -. ACCESSORY AND REMOTE CONTROLLER 7 0 Part numbers that are circled are not shown in the illustration.. 5 6 7 8 9 0 5 6 7 8 9 0 Part. E0 57 0 E0 08 509 E0 00 50 E0 08 70 E0 57 5 E0 685 00 E0 685 0 E0 7 8 E0 87 85 E0 57 0 E0 87 00 E0 57 00 E0 8 0 E0 08 0 E0 87 E0 57 E0 58 9 E0 57 68 E0 89 5 E0 895 5 E0 896 5 E0 57 08 E0 87 75 E0 89 75 E0 79 07 E0 57 07 E0 58 0 E0 59 0 FUSE 8 9 VARISTOR 5 6 -. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part Name LINE FLOW FAN BEARING MOUNT SLEEVE BEARING DRAIN HOSE NOZZLE (WH) VANE UPPER (WH) VANE LOWER (WH) FUSE VARISTOR VANE CRANK SET INDOOR FAN MOTOR ASSEMBLY INDOOR FAN MOTOR ASSEMBLY VANE MOTOR (VERTICAL) VANE MOTOR (HORIZONTAL) MOTOR BAND MOTOR BAND DISPLAY P.C. BOARD RECEIVER P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ROOM TEMPERATURE THERMISTOR TERMINAL BLOCK TERMINAL BLOCK INDOOR COIL THERMISTOR INDOOR COIL THERMISTOR VANE MOTOR SUPPORT SET(RIGHT) VANE MOTOR SUPPORT SET(LEFT) 7 Symbol in Wiring Diagram F NR MF MF MV MV RT TB TB RT RT, RT MS-GA50 VB - E (WH) Q'ty/unit MS-GA60 VB - E (WH) MS-GA80 VB - E (WH).5A Remarks RCV - Including RUBBER MOUNT RCV0 - Including RUBBER MOUNT RIGHT & LEFT UP & DOWN AUTO RESTART Including.6 AUTO RESTART Including.6 AUTO RESTART Including.6 -. ACCESSORY AND REMOTE CONTROLLER E0 57 6 E0 57 08 REMOTE CONTROLLER REMOTE CONTROLLER HOLDER KM0B
OPTIONAL PARTS AIR CLEANING FILTER AIR CLEANING FILTER removes fine dust of 0.0 micron from air by means of static electricity. rmal life of AIR CLEANING FILTER is 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. DO NOT reuse AIR CLEANING FILTER even if it is washed. DO NOT remove or attach AIR CLEANING FILTER during unit operation. Model MS-GA50VB - E MS-GA60VB - E MS-GA80VB - E Part. MAC-700FT Air cleanig filter (White bellows type)
HEAD OFFICE: MITSUBISHI DENKI BLDG.,--, MARUNOUCHI, CHIYODA-KU, TOKYO00-80, JAPAN C Copyright 00 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Oct. 00..OB69 6 Made in Japan New publication, effective Oct. 00 Specifications subject to change without notice.