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9-3. INSTRUCTION OF TROUBLESHOOTING

Indoor unit operates.
Outdoor unit does
not operate.

Indoor unit operates.
Outdoor unit does
not operate normally.

Indoor unit does not
receive the signal from
remote controller.

OPERATION INDICATOR
lamp on the indoor unit is

blinking on and off.

Outdoor unit
operates only
in Test Run
operation. *1

Outdoor unit
does not
operate even
in Test Run
operation. *1

Unit does not
operate nor-
mal operation
in COOL or
HEAT(

MSZ

)

mode.

Indoor unit
operates, when
the emergency
operation switch
is pressed.

Indoor unit does
not operate, when
the emergency
operation switch
is pressed.

Check room
temperature
thermistor.
Refer to 9-7.
“Test point
diagram and
voltage”.

Refer to “How
to check
inverter/
compressor”.

Refer to
“Check of R.V.
coil”.

Refer to 9-6.
“Check of remote
controller and
receiver P.C.
board”.

1. Check indoor/outdoor

connecting wire.
(Check if the power is
supplied to the indoor
unit.)

2. Refer to 9-6. “Check

of indoor electronic
control P.C. board and
indoor fan motor”.

Start

*1 “Test Run operation” means the operation within

30 minutes after the emergency operation switch
is pressed.

Refer to 9-4.
“TROUBLE-
SHOOTING
CHECK TABLE”.

NOTE:

If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function.

OBH874A

Содержание MSY-GS09NA - U1

Страница 1: ...AND FUNCTIONS 3 3 SPECIFICATION 7 4 OUTLINES AND DIMENSIONS 10 5 WIRING DIAGRAM 12 6 REFRIGERANT SYSTEM DIAGRAM 15 7 SERVICE FUNCTIONS 17 8 MICROPROCESSOR CONTROL 20 9 TROUBLESHOOTING 34 10 DISASSEMBLY INSTRUCTIONS 59 No OBH874 REVISED EDITION A INDOOR UNIT Outdoor unit service manual MUZ GS NA NAH MUY GS NA Series OBH875 MXZ C NA MXZ C NAHZ Series OCH573 PARTS CATALOG OBB874 OBH874 is void Revisi...

Страница 2: ...ow the instructions Preparation before the repair service Prepare the proper tools Prepare the proper protectors Provide adequate ventilation After stopping the operation of the air conditioner turn off the power supply breaker and pull 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 ele...

Страница 3: ...older 1 4 Screws for 3 3 5 16 mm Black 2 5 Battery AAA for 6 2 6 Wireless remote controller 1 7 Felt tape For left or left rear piping 1 8 Air cleaning filter 2 Remote controller Horizontal vane Air ﬁlter Air inlet Heat exchanger Front panel Air cleaning ﬁlter Anti Allergy Enzyme Filter Nano platinum ﬁlter Air outlet Operation indicator lamp Remote control receiving section Emergency operation swi...

Страница 4: ...ery AAA for 6 2 6 Wireless remote controller 1 7 Felt tape Used for left or left rear piping 1 8 Air cleaning filter 2 Fan guard Remote controller Operation indicator lamp Emergency operation switch Horizontal vane Air outlet Air ﬁlter Nano platinum ﬁlter Air inlet Front panel Air cleaning ﬁlter Anti Allergy Enzyme Filter Remote control receiving section Heat exchanger OBH874A ...

Страница 5: ...for 6 2 6 Wireless remote controller 1 7 Felt tape Used for left or left rear piping 1 8 Air cleaning filter 2 Fan guard Remote controller Front panel Air ﬁlter Nano platinum filter Air inlet Air cleaning filter Electrostatic anti allergy enzyme filter Air outlet Horizontal vane Operation indicator lamp Emergency operation switch Heat exchanger Remote control receiving section OBH874A ...

Страница 6: ...6 mm Black 2 5 Battery AAA for 6 2 6 Wireless remote controller 1 7 Felt tape For left or left rear piping 2 8 Air cleaning filter 2 Operation indicator lamp Remote control receiving section Emergency switch Horizontal vane Air outlet Air ﬁlter Nano platinum filter Air inlet Air cleaning ﬁlter Anti Allergy Enzyme Filter operation Front panel Remote controller MSZ GS30 36NA2 MSY GS30 36NA2 MSZ GS30...

Страница 7: ... 1 050 910 780 640 1 300 1 090 920 730 Cond drain connection O D in 5 8 Dimensions W in 31 7 16 36 5 16 43 5 16 D 9 1 8 9 13 16 9 3 8 H 11 5 8 12 12 13 16 Weight Ib 23 28 37 External finish Munsell 1 0Y 9 2 0 2 Remote controller Wireless type Control voltage by built in transformer 12 24 V DC NOTE Test conditions are based on AHRI 210 240 Indoor model MSZ GS06NA MSZ GS09NA MSY GS09NA MSZ GS12NA MS...

Страница 8: ...n transformer 12 24 V DC NOTE Test conditions are based on AHRI 210 240 Model MSZ GS30NA2 MSY GS30NA2 MSZ GS36NA2 MSY GS36NA2 Power supply V phase Hz 208 230 1 60 Disconnect switch A 15 Min circuit ampacity A 1 0 Fan motor F L A 0 76 Airflow Super High High Med Low COOL Dry Wet CFM 915 699 602 374 823 629 542 336 932 710 613 379 839 639 552 341 HEAT Dry 803 699 602 423 816 710 613 431 Moisture rem...

Страница 9: ...NA MSY GS15NA HEAT MSZ Dry 437 22 2 31 7 COOL Dry 504 25 6 36 4 Wet 454 23 0 32 9 MSZ GS18NA MSY GS18NA HEAT MSZ Dry 629 28 7 42 8 COOL Dry 629 28 7 42 8 Wet 566 25 8 38 7 MSZ GS24NA MSY GS24NA HEAT MSZ Dry 701 17 1 35 1 COOL Dry 701 17 1 35 1 Wet 631 15 4 31 7 MSZ GS30NA MSZ GS36NA MSY GS30NA MSY GS36NA HEAT MSZ Dry 803 15 1 35 3 COOL Dry 915 17 2 40 0 Wet 823 15 4 36 1 MSZ GS30NA2 MSZ GS36NA2 MS...

Страница 10: ...6 15 3 8 Flared connection ø1 4 Gas line ø15 32 13 3 8 Flared connection ø1 2 Drain hose Insulation ø1 5 32 Connected part ø5 8 O D 2 1 4 2 1 2 9 13 16 3 16 35 13 16 36 5 16 1 4 27 15 16 6 5 16 2 1 16 12 2 9 16 2 13 16 2 1 2 2 9 16 3 11 16 2 1 16 9 7 16 10 5 16 1 8 8 7 8 8 7 8 3 11 16 8 3 4 10 3 8 2 5 16 15 7 8 8 11 16 3 11 16 7 8 1 7 16 Oblong hole 7 16 13 16 Oblong hole Installation plate Indoor...

Страница 11: ...6NA2 MSY GS36NA2 MSZ GS30NA MSY GS30NA MSZ GS36NA MSY GS36NA Wireless remote controller Indoor unit Air out Air in 45 1 2 46 1 16 14 3 8 2 15 16 33 11 16 9 1 2 2 11 16 2 3 16 20 7 8 17 11 16 Installation plate Piping Drain hose Wall hole ø3 2 5 16 3 4 6 1 4 1 7 8 4 11 16 7 8 11 5 8 1 7 8 1 8 5 3 8 5 7 8 2 5 8 2 1 2 2 15 16 11 5 8 1 4 2 3 8 3 4 7 5 8 OBH874A ...

Страница 12: ...12 WIRING DIAGRAM 5 MSZ GS18NA MSY GS18NA MSZ GS06NA MSZ GS09NA MSZ GS12NA MSZ GS15NA MSY GS09NA MSY GS12NA MSY GS15NA OBH874A ...

Страница 13: ...13 MSZ GS30NA MSZ GS36NA MSY GS30NA MSY GS36NA MSZ GS24NA MSY GS24NA OBH874A ...

Страница 14: ...14 MSZ GS30NA2 MSY GS30NA2 MSZ GS36NA2 MSY GS36NA2 OBH874A ...

Страница 15: ...gerant flow in cooling Refrigerant flow in heating Only MSZ Indoor heat exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø3 8 ø9 52 MSZ GS06 09 12NA MSY GS09 12NA ø1 2 ø12 7 MSZ GS15NA MSY GS15NA with heat insulator Refrigerant pipe ø1 4 ø6 35 with heat insulator Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub Refrigerant flow in cool...

Страница 16: ...rant pipe ø1 4 ø6 35 with heat insulator Distributor Indoor coil thermistor RT13 Sub Flared connection Indoor heat exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø5 8 ø15 88 with heat insulator Refrigerant pipe ø1 4 ø6 35 with heat insulator Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub Refrigerant flow in cooling Refrigerant flow...

Страница 17: ...atteries before modification The board has a print as shown below NOTE For modification take out the batteries and press the OFF ON stop operate button twice or 3 times at first After finish modification put back the batteries then press the RESET button J2 J1 The P C board has the print J1 and J2 Solder J1 and J2 according to the number of indoor unit as shown in Table 1 After modification press ...

Страница 18: ...ly timer is not being edited 1 Hold down button on the remote controller for 2 seconds to enter the pairing mode 2 Press button again and assign a number to each remote controller Each press of button advances the number in the following order 1 2 3 4 3 Press button to complete the pairing setting After you turn the breaker ON the remote controller that first sends a signal to an indoor unit will ...

Страница 19: ...by one 7 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 AUTO RESTART FUNCTION automatically starts operation in the same mode just before the shutoff of the main power Operation If the main power has been cut the operation settings remain After th...

Страница 20: ...SZ GS06NA MSZ GS09NA MSZ GS12NA MSZ GS15NA MSZ GS18NA MSZ GS24NA MSZ GS30NA MSZ GS36NA MSZ GS30NA2 MSZ GS36NA2 MSY GS09NA MSY GS12NA MSY GS15NA MSY GS18NA MSY GS24NA MSY GS30NA MSY GS36NA MSY GS30NA2 MSY GS36NA2 MSZ GS06NA MSZ GS09NA MSZ GS12NA MSZ GS15NA MSY GS09NA MSY GS12NA MSY GS15NA Battery replacement indicator Temperature buttons Signal transmitting section OFF ON stop operate button Distan...

Страница 21: ...on indicator at the right side of the indoor unit indicates the operation state The following indication applies regardless of shape of the indication Indication Operation state Room temperature The unit is operating to reach the set temperature About 4 F 2 C or more away from set temperature The room temperature is approaching the set temperature About 2 to 4 F 1 to 2 C from set temperature Stand...

Страница 22: ...tery replacement indicator 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 MSZ GS30NA MSZ GS36NA MSY GS30NA MSY GS36NA Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state The following indication applies regardless of shape of ...

Страница 23: ... replacement indicator 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 INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state The following indication applies regardless of shape of the indication Indic...

Страница 24: ...or heat exchanger and or the room tempera ture is low or when defrosting is being done the indoor fan will stop or rotate in Very Low speed 2 High pressure protection The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the condens ing pressure from increasing excessively When the temperature of indoor heat exchanger becomes too high the hig...

Страница 25: ...ring the room temperature the frequency of pressing Temperature buttons TEMP or button TOO WARM or TOO COOL button and the user s preference to heat or cool So this is called Fuzzy con trol and works only in I FEEL CONTROL mode In DRY mode of I FEEL CONTROL the set temperature doesn t change To raise the set temperature 2 4 F 1 2 C To lower the set temperature 2 4 F 1 2 C 8 6 AUTO CHANGE OVER AUTO...

Страница 26: ...ly flows into it 8 7 AUTO VANE OPERATION 1 Horizontal vane 1 Vane motor drive These models are equipped with a stepping motor for the horizontal vane The rotating direction speed and angle of the motor are controlled by pulse signals approximately 12 V transmitted from indoor microprocessor 2 The horizontal vane angle and mode change as follows by pressing VANE control button MSZ GS30 36NA MSY GS3...

Страница 27: ... Angle 1 other models for dew prevention 7 SWING mode By selecting SWING mode with VANE control button the horizontal vane swings vertically 8 Cold air prevention in HEAT operation MSZ The horizontal vane position is set to Upward NOTE When 2 or more indoor units are operated with multi outdoor unit even if any indoor unit turns thermostat OFF this control does not work in the indoor unit 9 POWERF...

Страница 28: ...ne moves until it touches the vane stopper Then the vane is set to the desired angle Confirming of standard position is performed a OFF ON stop operate button is pressed POWER ON OFF b SWING is started or finished c The power supply turns ON 4 SWING MODE By selecting SWING mode with WIDE VANE button the vertical vane swings horizontally The remote controller displays 5 WIDE MODE MSZ GS24 30 36NA M...

Страница 29: ...imer setting a Press Off timer button during operation b Set the time of the timer using TIME set buttons and and Each time forward button is pressed the set time increases by 10 minutes each time backward button 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 dis...

Страница 30: ...ach time backward button is pressed the set time decreases by 1 minute Pressing those buttons longer the set time increases decreases by 10 minutes c Press the CLOCK set button 2 Press OFF ON stop operate button to start the air conditioner 3 Set the time of timer ON timer setting a Press ON TIMER button during operation b Set the time of the timer using TIME SET buttons and OFF timer setting a Pr...

Страница 31: ...s complete When the weekly timer is set temperature can not be set to 50 F 10 C The weekly timer operation and SMART SET operation cannot be used together 1 How to set the weekly timer Make sure that the current time and day are set correctly 1 Press button to enter the weekly timer setting mode blinks 2 Press and buttons to select setting day and number Pressing selects the day of the week to be ...

Страница 32: ...imer is turned OFF 2 Checking weekly timer setting 1 Press button to enter the weekly timer setting mode blinks 2 Press or buttons to view the setting of the particular day or number 3 Press button to exit the weekly timer setting NOTE When all days of the week are selected to view the settings and a different setting is included among them will be displayed 8 11 SMART SET OPERATION 1 How to SET S...

Страница 33: ...In case of latter normal operation will start NOTE Do not press the emergency operation switch during normal operation Operation mode COOL HEAT MSZ Set temperature 75 F 24 C 75 F 24 C Fan speed Med Med Horizontal vane Auto Auto The operation mode is indicated by the Operation Indicator lamp as follows MSZ EMERGENCY COOL EMERGENCY HEAT STOP MSZ EMERGENCY COOL EMERGENCY HEAT STOP MSY EMERGENCY COOL ...

Страница 34: ...ll connectors and terminals are connected properly 3 When the electronic control P C board seems to be defective check for disconnection of the copper foil pattern and burnt or discolored components 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 replace the batteries to operate the remote controller...

Страница 35: ...failure mode recall function Refer to 9 2 2 Make sure to check at least two consecutive blinking cycles 2 Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller The outdoor unit is abnormal Check the blinking pattern and confirm the abnormal point with...

Страница 36: ...stor the sub indoor coil thermistor 9 7 3 time blink 2 5 second OFF Serial signal The serial signal from outdoor unit is not received for a maximum of 6 minutes Refer to 9 6 How to check miswiring and serial signal error Refer to Check of compressor protector of outdoor unit service manual Except GS30 36NA 11 time blink 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is no...

Страница 37: ...r unit does not operate when the emergency operation switch is pressed Check room temperature thermistor Refer to 9 7 Test point diagram and voltage Refer to How to check inverter compressor Refer to Check of R V coil Refer to 9 6 Check of remote controller and receiver P C board 1 Check indoor outdoor connecting wire Check if the power is supplied to the indoor unit 2 Refer to 9 6 Check of indoor...

Страница 38: ...or operation Refer to Check of outdoor thermistor Refer to outdoor unit service manual 7 Outdoor control system Upper lamp blinks 7 time blink 2 5 second OFF It cannot properly read data in the nonvolatile memory of the inverter P C board or the out door electronic control P C board Replace the inverter P C board or the outdoor electronic control P C board Refer to outdoor unit service manual 8 Ot...

Страница 39: ... do not operate It cannot properly read data in the nonvolatile memory of the inverter P C board or the outdoor electronic control P C board Replace the inverter P C board or the outdoor electronic control P C board Refer to outdoor unit service manual 8 Other abnormality 1 Left lamp blinks 14 time blink 2 5 second OFF Indoor unit and outdoor unit do not operate An abnormality other than the above...

Страница 40: ...R ROTOR MSZ GS18 24NA MSY GS18 24NA Horizontal vane motor MV1 Vertical vane motor MV2 Measure the resistance between the terminals with a multimeter Part temperature 50 86 F Color of the lead wire Normal MSZ GS18NA MSY GS18NA Horizontal vane motor MV1 RED BLK 223 268 Ω Vertical vane motor MV2 RED YLW 219 273 Ω Color of the lead wire Normal MSZ GS24NA MSY GS24NA Horizontal vane motor MV1 RED BLK 31...

Страница 41: ... between CN211 and on the power P C board rise to the range of 3 to 6 V DC within 12 seconds after the emergency operation switch is pressed Replace the indoor fan motor Yes No The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stops Measure the voltage between CN211 and while the fan motor is rotating Replace the indoor power P C boa...

Страница 42: ...e the voltage between CN211 and If more than 12 seconds passes after the 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 V DC within 12 seconds after the emergency operation switch is pressed Replace the indoor fan motor...

Страница 43: ...en CN211 and If 12 seconds or more passes after the emergency operation switch is pressed the voltage mentioned above 2 goes 0 V DC although the indoor electronic control P C board is normal Is there 294 325 V DC between CN211 and and does the voltage between CN211 and rise to the range of 3 to 6 V DC within 12 seconds after the emer gency operation switch is pressed Replace the indoor fan motor Y...

Страница 44: ...oard connector CN20A No 2 and No 3 when the remote controller button is pressed Refer to 9 7 5 Is the voltage approximately 4 V DC 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 digital camera or a camera phone It is normal if the LED of the signa...

Страница 45: ...urn ON a radio to AM and press switch ON the remote controller Is noise heard from radio Yes No Replace the remote controller Are there any fluorescent lights of inverter or rapid start type within the range of 3 28 ft Yes No Reinstall the unit away from lights Attach a filter on receiving part Measure the voltage between receiver P C board connector CN301 No 2 and No 3 when the remote controller ...

Страница 46: ...use F11 3 Measure the resistance of resistor R111 on the indoor power P C board No Is the resistance of resistor R111 approximately 4 Ω No Replace the indoor power P C board the indoor terminal P C board and the indoor fan motor Replace the indoor electronic control P C board Measure the resistance of the vane motor coil Refer to 9 5 Short circuit Replace the vane motor and the indoor electronic c...

Страница 47: ...ce the indoor electronic control P C board Measure the resistance of the vane motor coil Refer to 9 5 Short open circuit Replace the vane motor and the indoor electronic control P C board 1 The fan motor connector s lead wire is red whereas is black 2 Connect of the multimeter to fan motor connector s lead wire and to lead wire otherwise the resistance cannot be measured properly 3 Please replace ...

Страница 48: ...oor fan motor Short open 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 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 fus...

Страница 49: ...11 blown No No Yes Yes Be sure to check both the fuse and the varistor in any case Is the fuse F11 blown only Measure the resistance between and of the indoor fan motor connector to CN211 on the indoor electronic control P C board 1 2 1 The fan motor connector s lead wire is red whereas is black 2 Connect of the multimeter to fan motor connector s lead wire and to lead wire otherwise the resis tan...

Страница 50: ...ON quick blinking 3 Yes No Lit or not lit Replace the inverter P C board or the outdoor electronic control P C board 2 2 Be careful of the residual voltage of smoothing capacitor Is there amplitude of 10 to 20 V DC between indoor terminal block S2 and S3 Confirmation of serial signal Yes Check the wiring If there are any error of the indoor outdoor connecting wire such as the damage of the wire in...

Страница 51: ...C board or the outdoor electronic control P C board repeat 3 6 second OFF and 0 8 second ON quick blinking 3 Yes GS24 GS18 No Lit or not lit Replace the inverter P C board or the outdoor electronic control P C board 2 2 Be careful of the residual voltage of smoothing capacitor Turn OFF the power supply Remove the bridge between outdoor terminal block S2 and S3 Yes 3 Be sure to check this within 3 ...

Страница 52: ... C board 2 2 Be careful of the residual voltage of smoothing capacitor Turn OFF the power supply Remove the short circuit between out door terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20 V DC between outdoor terminal block S2 and S3 Confirmation of serial signal Yes No Is there any error of the indoor outdoor connecting wire such as the damage of the wire intermedi...

Страница 53: ...h or the installation condition combination of specific conditions such as antennas or wiring Check the followings 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 indo...

Страница 54: ...6 V DC 15 V DC GND high volt age DC 294 325 V DC Timer short mode point Refer to 7 1 Room temperature thermistor RT11 CN111 Indoor coil thermistor RT12 RT13 CN112 Vane motor CN151 Connector to Indoor power P C board CN10A 12 V DC 5 V DC To disable Auto restart function solder the Jumper wire to JR77 Refer to 7 3 Emergency operation switch SW1 2 Indoor electronic control P C board GND Room temperat...

Страница 55: ...door fan motor CN211 Resistor R111 Connector to Terminal block CN201 3 6 V DC 15 V DC GND High voltage DC 294 325 V DC 0 or 15 V DC Timer short mode point Refer to 7 1 Room temperature thermistor RT11 CN111 Connector to Indoor coil thermistor RT12 RT13 CN112 Vane motor CN151 CN152 Connector to indoor power P C board CN10A 5 V DC To disable Auto restart function cut the Jumper wire to JR77 Refer to...

Страница 56: ...Indoor terminal P C board Indoor electronic control P C board Power monitor receiver SW P C board Fuse F11 Varistor NR11 Terminal block Indoor fan motor CN211 0 or 15 V DC 3 6 V DC 15 V DC GND high voltage DC 325 V DC Resistor R111 Emergency operation switch SW1 To disable Auto restart function cut the Jumper wire to JR77 Refer to 7 3 Timer short mode point Refer to 7 1 Vane motor CN151 5 V DC 12 ...

Страница 57: ...nnector to Indoor fan motor CN211 3 6 V DC 15 V DC GND High voltage DC 325 V DC 0 or 15 V DC To disable Auto restart function cut the Jumper wire to JR77 Refer to 7 3 Fuse F11 T3 15AL250V Timer short mode point Refer to 7 1 R111 12 V DC GND 5 V DC Varistor NR11 Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Temperature F Resistance kΩ 32 50 68 86 104 122 140 Indoor coil thermist...

Страница 58: ...oor coil thermistor RT12 RT13 Temperature F Resistance kΩ 32 50 68 86 104 122 140 Vane motor CN151 R111 12 V DC GND 5 V DC Indoor coil thermistor RT12 RT13 CN112 Indoor electronic control P C board Connector to Indoor fan motor CN211 3 6 V DC 15 V DC GND High voltage DC 325 V DC 0 or 15 V DC To disable Auto restart function cut the Jumper wire to JR77 Refer to 7 3 Fuse F11 T3 15AL250V Timer short ...

Страница 59: ...w caps of the panel Remove the screws of the panel 3 Unhook the lower part of the panel 4 Hold the lower part of both ends of the panel and pull it slightly toward you and then remove the panel by pushing it upward Photo 1 Detaching method of the terminal with locking mechanism The terminal which has the locking mechanism can be detached as shown below There are 2 types of the terminal with lockin...

Страница 60: ...door electronic control P C board Photo 2 Photo 3 Photo 4 3 Removing the indoor power P C board the indoor terminal P C board and the electrical box 1 Remove the panel Refer to section 1 and the corner box 2 Remove the indoor outdoor connecting wire and the indoor electric control P C board holder Refer to section 2 2 8 3 Remove the screw of the conduit cover and the conduit cover 4 Remove the scr...

Страница 61: ...4 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly Photo 5 5 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to section 5 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 moto...

Страница 62: ...move the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Refer to Photo 9 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 5 32 inch 4 mm gap is provided between the right en...

Страница 63: ...he screw caps on the panel and remove the screws of the panel 2 Pull the panel slightly toward you and then remove the panel by pushing it upward 10 2 MSZ GS18NA MSY GS18NA NOTE Turn OFF the power supply before disassembly Photo 1 Screws of the panel Front panel OBH874A ...

Страница 64: ...nd remove the water cover 12 Remove the screw of the electrical cover and remove the electrical cover 13 Disconnect the CN211 Indoor fan motor from the indoor power P C board 14 Remove the upper catch of the electrical box and pull out the electrical box To attach the electrical box pass the wires connecting the indoor power P C board and the indoor electronic control P C board through A Pass the ...

Страница 65: ...e back side of the control P C board holder 5 Unhook the catches of the control P C board holder and open the control P C board holder 6 Remove the indoor electronic control P C board from the control P C board holder 4 Removing the vane motor 1 Remove the panel Refer to section 1 Remove the right corner box 2 Remove the control P C board holder water cover and the electrical box Refer to section ...

Страница 66: ...band and 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 9 Remove the screws fixing the left side and upper right 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...

Страница 67: ...ower monitor receiver holder and pull out the power monitor receiver SW P C board 9 Disconnect all the connectors on the indoor electronic control P C board and unhook all lead wires 10 Remove the screw of the terminal block on the indoor terminal P C board 11 Remove the indoor terminal P C board and the indoor electronic control P C board 3 Removing the indoor electrical box 1 Remove the panel Re...

Страница 68: ...e 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 horizo...

Страница 69: ...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 13 64 inch 5 mm gap is provi...

Страница 70: ... Remove the electri cal cover 3 Remove the screw of the V A clamp 4 Remove the V A clamp then remove the indoor outdoor con necting wire 5 Disconnect TAB of the ground 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 ...

Страница 71: ... vane motor unit from the shaft of the vertical 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 section 3 2 Remove the screws of the horizontal vane motor unit and pull out the horizontal vane motor unit 3 Disconnect...

Страница 72: ... the hooks of the motor bed 8 Remove the motor band and the motor bed together with indoor fan motor Be careful 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 th...

Страница 73: ...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...

Страница 74: ...LECTRIC CORPORATION Issued Oct 2022 No OBH874 REVISED EDITION A Published Jan 2021 No OBH874 Made in Japan Specifications subject to change without notice HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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