Mitsubishi Electric MS-GK24VA Service Manual Download Page 3

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PART NAMES AND FUNCTIONS

ACCESSORIES

MS-GK24VA MS-GK30VAT

Horizontal vane

Air outlet

Air

lter

(Nano platinum

lter)

Air inlet

Front panel

Air cleaning

lter

(Electrostatic anti-allergy

enzyme

lter, option)

Remote controller

Display section

Heat exchanger

Operation indicator lamp

Remote control receiving section

Emergency operation switch

Model

MS-GK24VA

MS-GK30VAT

Installation plate

xing screw 4 × 25 mm

Remote controller holder

Fixing screw for 3.5 × 16 mm (Black)

Battery (AAA) for remote controller

Wireless remote controller

Felt tape (For left or left-rear piping)

OBH734B

Summary of Contents for MS-GK24VA

Page 1: ...late TM SERVICE MANUAL No OBH734 REVISED EDITION B MS GK24VA MS GK30VAT CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 3 3 SPECIFICATION 5 4 OUTLINES AND DIMENSIONS 6 5 WIRING DIAGRAM 8 6 REFRIGERANT SYSTEM DIAGRAM 9 7 SERVICE FUNCTIONS 11 8 MICROPROCESSOR CONTROL 13 9 TROUBLESHOOTING 21 10 DISASSEMBLY INSTRUCTIONS 36 Revision B MS GK24VA KU2 U MS GK30 36 VAT KU2 U have been added OBH73...

Page 2: ...VAT KU2 U 1 The model name has been changed so as to correspond to standard 2 Remote controller has been changed The setting temperature range has been changed TECHNICAL CHANGES 1 Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified ...

Page 3: ...option Remote controller Display section Heat exchanger Operation indicator lamp Remote control receiving section Emergency operation switch Model MS GK24VA MS GK30VAT Installation plate 1 Installation plate fixing screw 4 25 mm 7 Remote controller holder 1 Fixing screw for 3 5 16 mm Black 2 Battery AAA for remote controller 2 Wireless remote controller 1 Felt tape For left or left rear piping 1 O...

Page 4: ...atechin air lter Air inlet Front panel Air cleaning lter Anti Allergy Enzyme Filter option Installation plate Installation plate fixing screw 4 x 25 mm Remote controller holder Screw for 3 5 x 16 mm Black Battery AAA for remote controller Wireless remote controller Felt tape Used for left or left rear piping Charge nut L Joint pipe 1 7 1 2 2 1 2 1 1 ACCESSORIES OBH734B ...

Page 5: ...tion 5 Airfl ow Super High m 3 h 1 320 1 296 High 1 122 1 134 1 392 Med 930 972 1 146 Low 744 828 924 Sound level Super High dB A 53 High 47 50 Med 42 44 Low 37 39 Fan speed Super High rpm 1 290 1 340 High 1 130 1 200 1 100 Med 970 1 060 940 Low 810 930 790 Fan speed regulator 4 3 Remote controller model KU1 KU2 KM14A KU1 KU2 KM15G KU2 U KM17C KU2 U KM17B NOTE Test conditions are based on ISO 5151...

Page 6: ... D Liquid line Ø9 52 0 5m Flared connection Ø6 35 Gas line Ø12 0 45m Flared connection Ø15 88 Drain hose Insulation Ø28 Connected part Ø16 O D Piping Insulation MS GK30VAT Ø50 O D Liquid line Ø9 52 0 5m Flared connection Ø9 52 Gas line Ø12 0 45m Flared connection Ø15 88 Drain hose Insulation Ø28 Connected part Ø16 O D Air out Piping Drain hose 11 26 Oblong hole 11 20 Oblong hole Installation plate...

Page 7: ...ose Indoor unit Drain hose Piping Installation plate Air out Air in Wall hole 75 15 88 0 4m Joint connection 15 88 0 4m Flared connection 19 05 9 52 0 5m Flared connection 9 52 31 O D 15 I D 50 O D 32 I D 855 74 241 150 5 65 1155 1170 365 67 7 47 55 531 449 136 2 5 47 296 22 119 5 66 75 120 or more 220 or more 107 3 or more 10 or more 236 5 or more 55 or more 368 or more 72 or more 5 295 Liquid li...

Page 8: ...8 WIRING DIAGRAM 5 MS GK24VA KU1 KU2 KU2 U MS GK30VAT KU1 KU2 KU2 U MS GK36VAT KU1 MS GK36VAT KU2 KU2 U OBH734B ...

Page 9: ...ulator Refrigerant pipe ø9 52 with heat insulator Indoor coil thermistor RT12 Refrigerant flow in cooling MS GK30VAT MS GK24VA Indoor heat exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø15 88 with heat insulator Refrigerant pipe ø6 35 with heat insulator Indoor coil thermistor RT12 Refrigerant flow in cooling OBH734B ...

Page 10: ...rmistor RT11 Indoor coil thermistor RT13 SUB Flared connection Refrigerant pipe 19 05 with heat insulator Refrigerant pipe 9 52 with heat insulator Indoor coil thermistor RT12 MAIN Strainer 50 Joint connection Flared connection Refrigerant flow in cooling OBH734B ...

Page 11: ... times at first After modification put back the batteries then press the RESET button J2 J1 Table 1 1 unit operation 2 units operation 3 units operation 4 units operation No 1 unit No modification Same as at left Same as at left Same as at left No 2 unit Solder J1 Same as at left Same as at left No 3 unit Solder J2 Same as at left No 4 unit Solder both J1 and J2 How to set the remote controller ex...

Page 12: ...re memorized when 10 seconds have passed after the indoor unit 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 can celled 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 preve...

Page 13: ...zontal vane button OFF TIMER button LONG button RESET button FAN SPEED CONTROL button OPERATION SELECT button ECONO COOL button WIDE VANE button Vertical vane button ON TIMER button CLOCK SET button POWERFUL COOL button KU1 KU2 KU2 U Signal transmitting section Operation display section Temperature buttons STOP OPERATE OFF ON button Indication of remote controller model is on back LONG TIME SET bu...

Page 14: ...f the indoor unit turns on with a beep tone 2 Select DRY mode with OPERATION SELECT button 3 The set temperature is determined from the initial room temperature 1 Coil frost prevention Coil frost prevention works the same way as that in COOL mode 8 1 1 However when coil frost prevention works while the compressor is not operating its speed becomes Low MS GK36VAT 8 3 FAN OPERATION 1 Press OPERATE S...

Page 15: ...NTROL mode set temperature is decided by the microprocessor based on the room temperature In addition set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm Each time TOO WARM or TOO COOL button is pressed the indoor unit receives the signal and emits a beep tone Fuzzy control When TOO COOL or TOO WARM button is pressed the microprocessor changes the s...

Page 16: ...tton is pressed in COOL mode set temperature is automatically set 2 C higher Also the horizontal vane swings in various cycles SWING operation makes you feel cooler than set temperature So even though the set temperature is higher the air conditioner can keep comfort As a result energy can be saved To cancel this operation select a different mode or press one of the following buttons in ECONO COOL...

Page 17: ...electing SWING mode with WIDE VANE button the vertical vane swings horizontally The remote controller dis plays Swing mode is cancelled when WIDE VANE button is pressed once again 5 WIDE MODE By selecting WIDE mode with WIDE VANE button indoor fan speed becomes faster than setting fan speed on the remote controller The remote controller displays Indoor fan speed becomes faster than setting fan spe...

Page 18: ...ton during operation b Set the time of the timer using TIME SET buttons and Each time FORWARD button is pressed the set time increases by 10 minutes each time BACKWARD but ton is pressed the set time decreases by 10 minutes 8 6 TIMER OPERATION 6 1 2 3 4 5 SWING 2 Vertical vane MS GK36VAT 1 Vane motor drive These models are equipped with a stepping motor for the vertical vane The rotating direction...

Page 19: ...e order of OFF timer and ON timer operation PROGRAM TIMER Example 2 The current time is 11 00 AM The unit turns on at 5 00 PM and off at 9 00 PM NOTE If the main power is turned OFF or a power failure occurs while ON OFF timer is active the timer setting is can celled As these models are equipped with an auto restart function the air conditioner starts operating with timer cancelled when power is ...

Page 20: ...hifts to EMERGENCY COOL MODE with a set temperature of 24 C The fan speed shifts to Med The coil frost prevention works even in the test run or the emergency operation In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed again or the unit receives any signal from the remote controller In the ...

Page 21: ...ng ser vice work 2 Before servicing check that the connector and terminal are connected properly 3 When the electronic control P C board seems to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 When troubleshooting Refer to 9 2 9 3 and 9 4 4 How to replace batteries Weak batteries may cause the remote controller malfunction In this c...

Page 22: ...oller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted Release the failure mode recall function according to Releasing the failure mode recall function mentioned above Yes Blinks Yes Blinks No No OFF Yes NOTE 1 Make sure to release the failure mode recall function after it is set up otherwise the unit cannot operate properly 2 If t...

Page 23: ...ceived for a maximum of 6 minutes Refer to 9 6 How to check miswiring and serial signal error 11 time flash 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted for 12 seconds after the indoor fan motor is operated Refer to 9 6 Check of indoor fan motor 12 time flash 2 5 second OFF Indoor control system It cannot properly read data in the nonvolatile memory of th...

Page 24: ...le of indoor unit control system Start Check room temperature thermistor and indoor coil thermis tor Refer to 9 7 Test point diagram and voltage MS GK36VAT Refer to 9 6 How to check mis wiring and serial signal error when outdoor unit does not work Refer to 9 6 Check of indoor fan motor Replace the indoor elec tronic control P C board Outdoor unit does not operate even in Test run operation MS GK2...

Page 25: ...it service manual 7 Outdoor control system MS GK36VAT Left lamp flashes 7 time flash 2 5 second OFF It cannot properly read data in the nonvolatile memory of the deicer P C board Replace the deicer P C board Refer to outdoor unit service manual 8 1 Refrigerant circuit Upper Left lamp flashes 14 time flash or more 2 5 second OFF The unit has been pumped down for a long time Check the stop valve The...

Page 26: ...t of thermistor Indoor coil thermistor RT12 MAIN RT13 SUB Indoor fan motor MF Check 9 6 Check of indoor fan motor MS GK24VA GK30VAT Horizontal vane motor MV1 Vertical vane motor MV2 Measure the resistance between the terminals with a tester Temperature 10 30 C Color of the lead wire Normal Horizontal vane motor MV1 RED BLK 313 375 Ω Vertical vane motor MV2 268 322 Ω MS GK36VAT Horizontal vane moto...

Page 27: ...Measure the voltage between CN211 and 2 Measure the voltage between CN211 and If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage measured at 2 above goes 0 VDC although the indoor P C board is normal Does the voltage between CN211 and on the indoor electronic control P C board rise to the range of 3 to 6 VDC within 12 seconds after EMERGENCY OPERATION switch is ...

Page 28: ...ter on receiving part Measure the voltage between power monitor receiver SW P C board connec tor CN20A No 2 and No 3 when the remote controller button is pressed Is the voltage approximately 4 VDC No Yes Replace indoor electronic control P C board Replace power monitor receiver SW P C board 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a dig...

Page 29: ...hem back and press the RESET button Refer to 9 1 4 Check if the unit operates with remote con troller Yes Does the unit operate with remote controller Yes OK No not clear Yes No No No 5 VDC or 0 VDC No Yes 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone It is normal if the LED of the signal transmitting secti...

Page 30: ...tance of the horizontal vane motor coil Refer to 9 5 Measure the resistance between CN211 and of the indoor fan motor connector Short circuit Replace the indoor fan motor Short circuit Replace the horizontal vane motor and the indoor electronic control P C board Turn OFF the power supply Check both parts side and pattern side of the indoor electronic control P C board visually Replace the varistor...

Page 31: ...izontal vane motor and the indoor electronic control P C board Turn OFF the power supply Check both parts side and pattern side of the indoor electronic control P C board visually Replace the varistor NR11 and fuse F11 Are the varistor NR11 burnt and the fuse F11 blown Be sure to check both the fuse and the varistor in any case No Yes No Is the fuse F11 blown only Yes No Is the resistance 1 M or m...

Page 32: ... is not miswiring Bridge outdoor terminal block S2 and S3 1 B Turn ON the power supply Check the wiring Correct them Turn OFF the power supply Remove the bridge between outdoor terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 and S3 Confirmation of serial signal Is there rated voltage between indoor terminal block S1 and S2 Conf...

Page 33: ... the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outdoor unit of the air conditioner indoor outdoor wiring earth wire antennas wiring from antenna...

Page 34: ...11 311 325 339 VDC GND high voltage DC 15 VDC 3 6 VDC 0 or 15 VDC Resistor R111 Timer short mode point JPG JPS Refer to 7 1 Varistor NR11 Terminal block To disable Auto restart function cut the Jumper wire to JR77 Refer to 7 3 Vane motor CN151 CN152 5 VDC 12 VDC Room temperature thermistor RT11 CN111 Indoor coil thermistor RT12 main CN112 Room temperature thermistor RT11 Indoor coil thermistor RT1...

Page 35: ...per wire to JR07 Refer to 7 3 220 230 240 VAC Fuse F11 T3 15AL250V Indoor coil thermistor RT12 MAIN RT13 SUB Horizontal vane motor CN151 SW P C board Power monitor receiver P C board 12 VDC 5 VDC 3 6 VDC 15 VDC GND high voltage DC 311 325 339 VDC Power supply input Indoor fan motor CN211 Varistor NR11 Room temperature thermistor RT11 Timer short mode point JPG JPS Refer to 7 1 Vertical vane motor ...

Page 36: ...tor receiver holder and pull out the power monitor receiver SW P C board 7 Disconnect all the connectors on the indoor electronic control P C board and unhook all lead wires 8 Remove the screw of the terminal block on the indoor terminal P C board 9 Remove the indoor terminal P C board and the indoor electronic control P C board Photo 2 36 1 Slide the sleeve and check if there is a locking lever o...

Page 37: ...box and pull out the electrical box Photo 3 4 Removing the nozzle assembly 1 Remove the panel Refer to 1 and the corner box 2 Remove the V A clamp and then the indoor outdoor connecting wire Photo 2 3 Remove the electrical cover Photo 2 4 Disconnect the following connectors on the electronic control P C board CN151 Horizontal vane motor CN152 Vertical vane motor 5 Remove the power monitor receiver...

Page 38: ... vertical vane motor from the vertical vane motor unit 7 Disconnect the connector of vertical vane motor from the vertical vane motor Photo 5 Photo 6 6 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screws of the horizontal vane motor unit and pull out the horizontal vane motor unit 3 Disconnect the connector from the horizontal vane motor 4 Remove the scre...

Page 39: ... the motor band Pull out the indoor fan motor 9 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it 10 Remove the screws fixing the left side of the heat exchanger 11 Lift the heat exchanger and pull out the line flow fan to the lower left When attaching the line flow fan screw the line flow fan so 5 mm gap is provi...

Page 40: ...Remove the screw of the V A clamp 4 Remove the V A clamp then remove the indoor out door connecting wire 5 Disconnect TAB of the earth wire connected to the indoor heat exchanger 6 Remove the screw of the electrical side cover Remove the electrical side cover 7 Disconnect all the connectors TAB and TAB4 on the indoor electronic control P C board 8 Remove the screw on lower side of the electrical b...

Page 41: ...he vertical vane motor unit from the shaft of the vane motor 6 Remove the vertical vane motor from the vertical vane motor unit 7 Disconnect the connector of vertical vane motor from the vertical vane motor 5 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 3 2 Remove the screws of the horizontal vane motor unit and pull out the horizontal vane motor unit 3 Disconnect the c...

Page 42: ...l not to drop the indoor fan motor because it is heavy 9 Remove the screw of the motor band and remove the motor band then pull out the indoor fan motor 10 Remove the screws of the left side of the heat exchanger 11 Lift the left side of the heat exchanger 12 Remove the line flow fan to the lower left When attaching the line flow fan screw the line flow fan so 5 mm gap is provided between the righ...

Page 43: ...ked position Do not pull the lead wire when removing the indoor coil thermistor Holder shape Clip shape When fixing the indoor coil thermistor to the clip shape holder shape part the lead wire should point down 1 Set the indoor coil thermistor in the center of the clip shape part 2 Check the marked mounting position 3 Mount the clip shape part Position and procedure for mounting the clip shape par...

Page 44: ...KU TOKYO 100 8310 JAPAN Copyright 2016 MITSUBISHI ELECTRIC CORPORATION Issued Sep 2017 No OBH734 REVISED EDITION B Issued Jun 2016 No OBH734 REVISED EDITION A Published Mar 2016 No OBH734 Made in Japan Specifications are subject to change without notice ...

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