Mitsubishi Electric MS-GF20VA Service Manual Download Page 10

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REFRIGERANT SYSTEM DIAGRAM

MS-GF20VA MS-GF25VA

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)

MS-GF35VA

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)

OBH621A

Summary of Contents for MS-GF20VA

Page 1: ...OUBLESHOOTING 21 11 DISASSEMBLY INSTRUCTIONS 35 SPLIT TYPE AIR CONDITIONERS Outdoor unit service manual MU GF VA Series OBH622 SERVICE MANUAL INDOOR UNIT PARTS CATALOG OBB621 NOTE RoHS compliant products have G mark on the spec name plate Models MS GF20VA E1 MS GF25VA E1 MS GF35VA E1 MS GF50VA E1 MS GF60VA E1 MS GF80VA E1 No OBH621 REVISED EDITION A Please void OBH621 Revision A MS GF50VA E1 MS GF...

Page 2: ...r tools Prepare the proper protectors Provide adequate ventilation After stopping the operation of the air conditioner turn off the power supply breaker and remove the power plug Discharge the capacitor before the work involving the electric parts Precautions during the repair service Do not perform the work involving the electric parts with wet hands Do not pour water into the electric parts Do n...

Page 3: ... remote controller 2 Wireless remote controller 1 Felt tape For left or left rear piping 1 MS GF20VA MS GF25VA MS GF35VA 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 ...

Page 4: ...troller Display section Heat exchanger Operation indicator lamp Remote control receiving section Emergency operation switch E O SW Model MS GF50VA MS GF60VA MS GF80VA 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: ...L m 3 h 558 624 1 086 1 086 1 206 High 474 558 870 942 1 086 Med 378 396 762 822 978 Low 246 288 642 714 882 Sound level Super High POWERFUL dB A 40 44 45 48 50 High 36 40 42 45 47 Med 31 33 38 41 43 Low 25 26 34 37 39 Fan speed Super High POWERFUL rpm 1 000 1 100 1 100 1 100 1 200 High 880 1 000 920 980 1 100 Med 740 770 800 880 1 010 Low 540 610 720 790 930 Fan speed regulator 4 Remote controlle...

Page 6: ...TER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE Super High FAN SPEED 40 NC 10 OCTAVE BAND SOUND PRESSURE LEVEL 0dB re 0 0002 MICRO BAR Test conditions Cooling Dry bulb temperature 27 C Wet bulb temperature 19 C INDOOR UNIT WALL MICROPHONE 0 8m 1m 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A ...

Page 7: ... 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE Super High FAN SPEED 48 NC 10 OCTAVE BAND SOUND PRESSURE LEVEL 0dB re 0 0002 MICRO BAR 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE Super Hig...

Page 8: ...9 5 199 5 199 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 43m Flared connection Ø12 7 Drain hose I...

Page 9: ...9 WIRING DIAGRAM 6 MS GF20VA MS GF25VA MS GF35VA MS GF50VA MS GF60VA MS GF80VA OBH621A ...

Page 10: ... 35 with heat insulator Indoor coil thermistor RT12 Refrigerant flow in cooling Refrigerant pipe 9 52 with heat insulator MS GF35VA 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 OBH621A ...

Page 11: ...hermistor RT11 Flared connection Refrigerant pipe ø12 7 MS GF50VA ø15 88 MS GF60 80VA with heat insulator Refrigerant pipe ø6 35 MS GF50 60VA ø9 52 MS GF80VA with heat insulator Indoor coil thermistor RT12 Refrigerant flow in cooling MS GF50VA MS GF60VA MS GF80VA OBH621A ...

Page 12: ...teries 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 particular indoor unit After you turn...

Page 13: ...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 prevent breaker OFF due to...

Page 14: ...ton ON TIMER button CLOCK button POWERFUL COOL button MS GF20VA MS GF25VA MS GF35VA 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 GF50VA MS GF60VA MS GF80VA Signal transmitting section Operation display section Temperature buttons OPERATE STOP ON OFF button Indication of remote control...

Page 15: ...OL button to select the desired temperature The setting range is 16 31 C 1 Coil frost prevention When the temperature of indoor heat exchanger becomes too low the coil frost prevention mode works The indoor fan operates at the set speed and the compressor stops This mode continues until the temperature of indoor heat exchanger rises Operation Indicator lamp The operation indicator at the right sid...

Page 16: ...OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone 2 Select I FEEL CONTROL mode with the OPERATION SELECT button 3 The operation mode is determined by the room temperature at start up of the operation Once the mode is fixed the mode does not change by room temperature afterwards Under ON TIMER operation mode is determined as follows When the system is stopped by the remote contr...

Page 17: ...sidering the room temperature the frequency of pressing TOO COOL or TOO WARM button and the user s preference to heat or cold So this is called Fuzzy control and works only in I FEEL CONTROL mode In DRY mode of I FEEL CONTROL the set temperature does not change To raise the set temperature 1 2 To lower the set temperature 1 2 9 5 AUTO VANE OPERATION 1 Horizontal vane 1 Vane motor drive These model...

Page 18: ...eeds 1 hour the vane angle automatically changes to Angle 1 for dew prevention 10 LONG MODE MS GF50 60 80VA By pressing LONG button indoor fan speed becomes faster than setting fan speed on the remote controller and the horizontal vane moves to the position for LONG mode The remote controller displays To cancel this opera tion press one of the following buttons LONG VANE CONTROL or ECONO COOL duri...

Page 19: ... button 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 2 To release the timer To release ON timer press ON TIMER button To release OFF timer press OFF TIMER button TIMER is cancelled and the display of set time disappears 9 6 T...

Page 20: ...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 case of latter normal operation will start NOTE Do not press EMERGENCY OPERATION switch duri...

Page 21: ...e 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 10 2 10 3 and 10 4 4 How to replace batteries Weak batteries may cause the remote controller malfunction In this case rep...

Page 22: ...troller 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 once it is set up otherw...

Page 23: ...ime 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 10 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 14 time fla...

Page 24: ...room 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 10 7 Test point diagram and voltage Refer to 10 6 Check of indoor fan motor Replace the indoor elec tronic control P C board Outdoor ...

Page 25: ...r 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 connection...

Page 26: ...r of the lead wire Normal WHT BLK 334 Ω 362 Ω BLK RED 370 Ω 402 Ω MS GF50 60 80VA Indoor fan motor MF Check 10 6 Check of indoor fan motor MS GF20 25 35VA 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 GF50 60 80VA Horizontal vane motor MV1 Vertical vane motor MV2...

Page 27: ...or 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 term...

Page 28: ...e between 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 m...

Page 29: ...ace indoor electronic control P C board Does the unit operate with the remote controller OK Yes No Not clear Replace the batteries Refer to 9 1 4 Press OPERATE STOP ON OFF button on the remote controller Is LCD display on the remote controller visible Remove the batteries then set them back and press RESET button Refer to 9 1 4 Check if the unit operates with the remote controller Yes No Turn ON a...

Page 30: ... 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 F11 a...

Page 31: ...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 varistor NR...

Page 32: ...he installation condition combination of specific conditions such as 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 outd...

Page 33: ...sable Auto restart function solder the Jumper wire to JR07 Refer to 8 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 GF20VA MS GF25VA MS GF35VA Indoor fan motor CN211 230 V AC Please replace the fuse after removing the indoor terminal P C board from the electrical box Fuse F11 Connector to indoor elec...

Page 34: ...C GND high voltage DC 15 VDC 3 6 VDC 0 or 15 VDC Resistor R111 Timer short mode point JPG JPS Refer to 8 1 Varistor NR11 Terminal block To disable Auto restart function cut the Jumper wire to JR77 Refer to 8 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 C R...

Page 35: ...s a 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 two types refer to 1 and 2 of th...

Page 36: ... 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 from t...

Page 37: ...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 37 Screws of...

Page 38: ...otor and motor band 6 Release the hooks of the motor band Remove the motor band Pull out the indoor 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 le...

Page 39: ... 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 corner box...

Page 40: ...he vertical 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 Remo...

Page 41: ...w of the motor band 8 Release the hooks of the motor band Remove 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 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...

Page 42: ...OKYO 100 8310 JAPAN Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Feb 2013 No OBH621 REVISED EDITION A Distributed in Oct 2012 No OBH621 Made in Japan New publication effective Feb 2013 Specifications are subject to change without notice ...

Page 43: ...Related Links Model Number MS GF60VA MS GF20 80VA_Declaration_of_Conformity_ CE2013B01 MS GF20 80VA_Parts_Catalog_ OBB621A MS GF20 80_Service_Manual_ OBH621 ...

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