Mitsubishi Electric MS-GH13VA Service Manual Download Page 9 | Manualshive

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Mitsubishi Electric MS-GH13VA Service Manual Download Page 9

9

Unit: mm

REFRIGERANT SYSTEM DIAGRAM

6

MS-GH13VA

Indoor

heat

exchanger

Flared connection

Room temperature
thermistor
RT11

Flared connection

Refrigerant pipe 6.35
(with heat insulator)

Indoor coil
thermistor
RT12

Refrigerant flow in cooling

Refrigerant pipe 9.52
(with heat insulator)

Indoor
heat
exchanger

Flared connection

Room temperature
thermistor
RT11

Flared connection

Refrigerant pipe ø12.7 (

MS-GH18VA

)

ø15.88 (

MS-GH24/30VA

)

(with heat insulator)

Refrigerant pipe ø6.35 (

MS-GH18/24VA

)

ø9.52

(

MS-GH30VA

)

(with heat insulator)

Indoor coil
thermistor
RT12

Refrigerant flow in cooling

MS-GH18VA MS-GH24VA MS-GH30VA

OBH664B

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Summary of Contents for MS-GH13VA

Page 1: ...7 6 REFRIGERANT SYSTEM DIAGRAM 9 7 SERVICE FUNCTIONS 10 8 MICROPROCESSOR CONTROL 12 9 TROUBLESHOOTING 19 10 DISASSEMBLY INSTRUCTIONS 33 Outdoor unit service manual MU GH VA Series OBH665 INDOOR UNIT PARTS CATALOG OBB664 NOTE RoHS compliant products have G mark on the spec name plate TM SERVICE MANUAL No OBH664 REVISED EDITION B OBH664 REVISED EDITION A is void Revision B MS GH13 18VA KU2 U have be...

Page 2: ...he 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 in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical fa...

Page 3: ... remote controller 2 Wireless remote controller 1 Felt tape For left or left rear piping 1 MS GH13VA Air filter Nano platinum filter Front panel Air cleaning filter Electrostatic anti allergy enzyme filter option Operation indicator lamp Remote control receiving section Emergency operation switch E O SW Horizontal vane Air outlet Heat exchanger Display section Air inlet Remote controller OBH664B ...

Page 4: ...troller Display section Heat exchanger Operation indicator lamp Remote control receiving section Emergency operation switch E O SW Model MS GH18VA MS GH24VA MS GH30VA 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 OB...

Page 5: ...86 1 206 High 558 870 990 1 122 Med 396 762 834 1 014 Low 288 642 714 882 Sound level Super High POWERFUL dB A 44 45 48 50 High 40 42 45 47 Med 33 38 41 43 Low 26 34 37 39 Fan speed Super High POWERFUL rpm 1 100 1 100 1 100 1 200 High 1 000 920 1 020 1 130 Med 770 800 890 1 040 Low 610 720 790 930 Fan speed regulator 4 Remote controller model KU1 KM12A KU1 KM12B KM12B KU2 KM15D KU2 KM16A KU2 U KM1...

Page 6: ...199 5 110 5 65 63 76 843 181 65 65 30 63 65 67 63 325 3 100 125 160 110 70 238 5 210 21 5 184 12 Piping Insulation Ø50 O D Liquid line Ø9 52 0 5m Flared connection Ø6 35 Gas line Ø12 0 43m Flared connection Ø15 88 Drain hose Inslation Ø28 Connected part Ø16 O D Piping Insulation Ø50 O D Liquid line Ø9 52 0 5m Flared connection Ø6 35 Gas line Ø12 0 45m Flared connection Ø12 7 Drain hose Inslation Ø...

Page 7: ...7 WIRING DIAGRAM 5 MS GH13VA KU1 MS GH13VA KU2 KU2 U OBH664B ...

Page 8: ...8 MS GH18VA KU1 MS GH24VA MS GH30VA MS GH18VA KU2 KU2 U OBH664B ...

Page 9: ... RT12 Refrigerant flow in cooling Refrigerant pipe 9 52 with heat insulator Indoor heat exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø12 7 MS GH18VA ø15 88 MS GH24 30VA with heat insulator Refrigerant pipe ø6 35 MS GH18 24VA ø9 52 MS GH30VA with heat insulator Indoor coil thermistor RT12 Refrigerant flow in cooling MS GH18VA MS GH24VA MS GH30VA OB...

Page 10: ...er 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 exclusively for parti...

Page 11: ...econds 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 prevent breaker OFF due to ...

Page 12: ... CONTROL button OPERATION SELECT button ECONO COOL button ON TIMER button CLOCK button POWERFUL COOL button MS GH13VA KU1 NOTE Last setting will be stored after the unit is turned OFF with the remote controller Indoor unit receives the signal of the remote controller with beeps MS GH13VA KU2 KU2 U Signal transmitting section Operation display section Temperature buttons STOP OPERATE OFF ON button ...

Page 13: ...O COOL button WIDE VANE button Vertical vane button ON TIMER button CLOCK SET button POWERFUL COOL button NOTE Last setting will be stored after the unit is turned OFF with the remote controller Indoor unit receives the signal of the remote controller with beeps MS GH18VA KU2 KU2 U Signal transmitting section Operation display section Temperature buttons STOP OPERATE OFF ON button Indication of re...

Page 14: ...KU2 KU2 U button OPERATION INDICATOR lamp of 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 8 3 FAN OPERATION 1 Press OPERATE STOP ON OFF MS GH13 18 24 30VA KU1 STOP OPERATE OFF ON MS GH13 18VA KU...

Page 15: ... is restarted with the remote controller the system operates with the previous set temperature regard less of the room temperature at restart The set temperature is calculated by the previous set temperature 5 TEMPERATURE buttons In I FEEL CONTROL 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 COO...

Page 16: ... 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 operation ECONO COOL VANE CONTROL LONG or POWERFUL COOL button 5 STOP operation OFF and ON TIMER standby In th...

Page 17: ...0 00 blinks at the current time display of TIME MONITOR so set the current time correctly with CLOCK button How to set the current time a Press the CLOCK button b Press the TIME SET buttons and to set the current time Each time FORWARD button is pressed the set time increases by 1 minute and each time BACKWARD button is pressed the set time decreases by 1 minute Pressing those buttons longer the s...

Page 18: ...ion is for servicing The indoor fan runs at High speed and the tem perature control does not work After 30 minutes of test run operation the system shifts 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 mo...

Page 19: ...service 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 case ...

Page 20: ...he remote controller the set temperature is displayed with the remote controller 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 No OFF NOTE 1 Make sure to release the failure mode recall function after it is...

Page 21: ...tor 9 7 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 the indoor electronic control P C board Replace the indoor electronic control P C board ...

Page 22: ...oom temperature indoor coil thermistor Upper lamp 3 time flash Cause Indoor unit Trouble of indoor fan motor Upper lamp 4 time flash Cause Indoor unit Trouble of indoor unit control system Start Check room temperature thermistor and indoor coil thermis tor Refer to 9 7 Test point diagram and voltage Refer to 9 6 Check of indoor fan motor Replace the indoor elec tronic control P C board Outdoor uni...

Page 23: ...con trol system Upper lamp flashes 4 time flash 2 5 second OFF It cannot properly read data in the nonvolatile memory of the indoor electronic control P C board Replace the indoor electronic control P C board 4 1 Refrigerant circuit Upper lamp flashes 14 time flash 2 5 second OFF The unit has been pumped down for a long time Check the stop valve The refrigerant amount is low Check the connections ...

Page 24: ...Normal WHT BLK 334 Ω 362 Ω BLK RED 370 Ω 402 Ω MS GH18 24 30VA Indoor fan motor MF Check 9 6 Check of indoor fan motor MS GH13VA Horizontal vane motor MV Measure the resistance between the terminals with a tester Temperature 10 30 C Color of the lead wire Normal RED BLK 223 Ω 268 Ω BLK BLK RED BLK BLK ROTOR MS GH18 24 30VA Horizontal vane motor MV1 Vertical vane motor MV2 Measure the resistance be...

Page 25: ...ctor CN211 visually Disconnect lead wires from connector CN211 on indoor power P C board Measure the resistance between lead wires No 1 and No 4 and then No 4 and No 7 Turn ON the power supply Stop it if the unit operates Insert screwdriver into air outlet to rotate indoor fan motor slowly for 1 revolution or over and measure the voltage No 2 and No 1 on CN121 No others Replace the indoor power te...

Page 26: ...tween CN211 and If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage measured at 2 above goes 0 V DC 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 pressed Replace the indoor fan motor Yes The indoor fan motor...

Page 27: ...the unit away from lights Attach a filter 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 V DC No Yes Replace indoor electronic control P C board Replace power monitor receiver SW P C board MS GH13VA MS GH18 24 30VA 2 If the inverter fluorescent light is turn...

Page 28: ...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 there approximately 5 VDC between 5 VDC and JPG GND of the indoor electronic control P C board Is there approximately 9 VDC to 13 VDC between 12 VDC and JPG GND of the indoor electronic control P C board Replace the fuse F11 1 Replace the fuse F1...

Page 29: ...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 NR11 and fuse F11 3 Are the varist...

Page 30: ...s antennas or wiring Check 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 an...

Page 31: ...e Auto restart function solder the Jumper wire to JR07 Refer to 7 3 Indoor coil thermistor RT12 Room temperature thermistor RT11 Temperature C Resistance kΩ 2 Indoor terminal P C board Indoor power P C board MS GH13VA Indoor fan motor CN211 220 230 240 VAC Please replace the fuse after removing the indoor terminal P C board from the electrical box Fuse F11 Connector to indoor electronic control P ...

Page 32: ...9 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 RT12 Temperature...

Page 33: ... locking lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Terminal with locking mechanism Detaching points The terminal which has the locking mechanism can be detached as shown below There are 2 types refer to 1 and 2 of the ter...

Page 34: ...door electronic con trol P C board 10 Remove the room temperature thermistor from the indoor electronic control P C board Photo 2 Photo 3 3 Remove the indoor power P C board the indoor terminal P C board and the electrical box 1 Remove the panel Refer to 1 and the corner box 2 Remove the indoor outdoor connecting wire Refer to 2 2 4 3 Remove the earth wire connected to the indoor heat exchanger fr...

Page 35: ...out the drain hose from the nozzle assembly and remove the nozzle assembly Photo 4 5 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screws of the horizontal vane motor unit 3 Disconnect the connector from the horizontal vane motor 4 Remove the screws of the horizontal vane motor 5 Remove the horizontal vane motor from the horizontal vane motor unit 35 Screw...

Page 36: ...ndoor fan motor 8 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Refer to Photo 8 9 Remove the screws fixing the left side of the heat exchanger 10 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 4 mm gap is provided between th...

Page 37: ...ll 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 Photo 3 3 Removing the indoor electrical box 1 Remove the panel Refer to 1 and the righ...

Page 38: ... vane 3 Remove the screw of the vertical vane motor unit and pull the vertical vane motor unit 4 Remove the screws of the vertical vane motor unit cover 5 Remove the crank of the 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 6 Removing the ho...

Page 39: ...ndoor fan motor 9 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 9 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 Photo 8 Photo 9 Photo 10 When attaching the line flow fan screw the line flow fan so 5 mm gap is pr...

Page 40: ...ip 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 part About the same length 40 HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Is...

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