Mitsubishi Electric TRANE NTXUKS09A112AA Page 38 Service Manual Download

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OPERATING PROCEDURE

PHOTOS/FIGURES

3. Removing the indoor electric control P.C. board,

the receiver P.C. board and the display P.C.
board

(1) Remove the intake grille.
(2) Remove the side panel (L).
(3) Remove the electrical cover

and

(4 fixing screws)

(Photo 2).

(4) Partially slide the indoor electronic control P.C. board

out.

(5) Disconnect all the connectors and lead wires on the

board to remove the indoor electric control P.C. board.

(6) Remove the tabs at the top and bottom of lamp cover,

and open the lamp cover.

(7) Disconnect the connectors and lead wires, and remove

the receiver P.C. board and the display P.C. board.

4. Removing the heat exchanger and stabilizer

(1) Remove the grille.
(2) Remove the room temperature thermistor.
(3) Remove the tabs (2 places) in the center of stabilizer

and remove the drain pan (4 fixing screws).

(4) Remove the electrical cover

and

(5) Disconnect the connectors of the horizontal and vertical

vane motors.

(6) Remove the indoor coil thermistors (main and sub).

(7) Remove the drain cover (3 fixing screws).
(8) Remove the pipe band.

(9) Remove the heat exchanger (6 fixing screws).

(

) Remove the stabilizer (2 fixing screws).

5. Removing the horizontal and vertical vane
motors

(1) Remove the grille.
(2) Remove the drain pan.
(3) Remove the horizontal vane.
(4) Remove the cover of horizontal and vertical vane

motors (2 fixing screws).

(5) Remove the vertical vane motor (2 fixing screws) and

disconnect the connector (Photo 4).

(6) Remove the horizontal vane motor (2 fixing screws)

and disconnect the connector (Photo 4).

Photo 4

Photo 2

Photo 3

Drain pan

Fixing screws of the electrical box

Lamp cover

Fixing screws
of the lamp
cover

Fixing screw of the electrical box

Electrical cover

Stabilizer

Motor cover of horizontal
and vertical vane motors

Heat
exchanger

Room temperature
thermistor

Drain pump

Float sensor

Drain cover

Vertical vane motor

Stabilizer

Horizontal vane motor

OBHT802

Summary of Contents for TRANE NTXUKS09A112AA

Page 1: ...nit service manual NTXMMX A AA NTXMPH A AA Series OBHT702 OCHT573 PARTS CATALOG OBBT802 CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 3 3 SPECIFICATION 4 4 OUTLINES AND DIMENSIONS 6 5 WIRING DIAGRAM 7 6 REFRIGERANT SYSTEM DIAGRAM 8 7 SERVICE FUNCTIONS 9 8 MICROPROCESSOR CONTROL 12 9 TROUBLESHOOTING 21 10 DISASSEMBLY INSTRUCTIONS 35 ...

Page 2: ...uctions 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 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 part...

Page 3: ...crew for 4 х 16 mm 2 Remote controller 1 Remote controller holder 1 Fixing screw for 3 5 x 16 mm Black 2 INDOOR UNIT NTXUKS09A112AA NTXUKS12A112AA NTXUKS18A112AA Display section Horizontal vane Vertical vane Air outlet Air ﬁlter Air purifying ﬁlter Air inlet Air cleaning ﬁlter Anti Allergy Enzyme filter option Intake grille Safety strings Spec name plate Open the display cover Remote control recei...

Page 4: ...32 27 47 41 36 29 Heating dB A 37 34 29 26 40 36 32 26 48 42 37 26 Cond drain connection O D in Ø1 26 mm Dimensions W in 43 3 8 D 14 3 16 H 7 5 16 Weight Ib 34 External finish White Control voltage by built in transformer 12 24 V DC NOTE Test conditions are based on ARI 210 240 1 Multi connection Specifications and rated conditions of main electric parts Model Item NTXUKS09A112AA NTXUKS12A112AA NT...

Page 5: ...Dry 325 13 6 21 7 Wet NTXUKS12A112AA HEAT Dry 332 13 9 22 1 COOL Dry 350 14 6 23 3 Wet NTXUKS18A112AA HEAT Dry 403 16 9 26 7 COOL Dry 417 17 5 27 6 Wet 2 OPERATION The operating range of the outdoor unit depends on the connected outdoor unit Mode Condition Intake air temperature F Indoor Outdoor DB WB DB WB Cooling Standard temperature 80 67 95 Maximum temperature 90 73 115 Minimum temperature 67 ...

Page 6: ...6 OUTLINES AND DIMENSIONS 4 Unit inch INDOOR UNIT NTXUKS09A112AA NTXUKS12A112AA NTXUKS18A112AA OBHT802 ...

Page 7: ...7 5 WIRING DIAGRAM INDOOR UNIT NTXUKS09A112AA NTXUKS12A112AA NTXUKS18A112AA OBHT802 ...

Page 8: ...t insulator Indoor coil thermistor RT12 main Indoor heat exchanger Flared connection Room temperature thermistor RT11 Indoor coil thermistor RT13 sub Flared connection Refrigerant flow in cooling Refrigerant flow in heating Refrigerant pipe Ø1 2 Ø12 7 with heat insulator Refrigerant pipe Ø1 4 Ø6 35 with heat insulator Indoor coil thermistor RT12 RT14 RT15 main INDOOR UNIT Unit inch mm NTXUKS09A112...

Page 9: ...2 How to set the remote controller 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 the setting turn ON the power supply and with the remote controller headed towards the in...

Page 10: ...usly 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 C111 JR77 IC101 How to disable AUTO RESTART FUNCTION Turn off the main power for the unit Cut the jumper wire to JR77 on the indoor electronic control P C board Refer to 9 7 Operation If the main p...

Page 11: ...ectrical cover 1 Electrical cover 2 Electronic control P C board Slide switch SW3 Normal Up Increase airflow volume 7 4 P C BOARD MODIFICATION FOR CHANGING AIRFLOW VOLUME How to change Dip switch SWV1 setting Factory setting is normal 1 Make sure that the breaker for air conditioner is turned OFF 2 Remove the electrical cover 1 and 2 of the indoor unit 3 Slide out the electronic control P C board ...

Page 12: ...om set tempera ture The room temperature is approaching the set tem perature About 2 to 4 F 1 to 2 C from set temperature Standby mode Refer to multi system operation Lit Blinking Not lit Signal transmitting section Operation display section TEMPERATURE buttons STOP OPERATE OFF ON button Indication of remote controller model is on back Distance of signal About 20 ft 6 m Beep s is are heard from th...

Page 13: ... on with a beep tone 2 Select HEAT mode with OPERATION SELECT button 3 Press TEMPERATURE buttons TEMP or button to select the desired temperature The setting range is 50 F 10 C and 61 88 F 16 31 C 1 Cold air prevention control When the compressor is not operating or is starting and the temperature of indoor heat exchanger and or the room tem perature is low or when defrosting is being done the ind...

Page 14: ...om indoor microprocessor 2 The horizontal vane angle and mode change as follows by pressing VANE CONTROL button NOTE The setting when the higher airflow is preferred in the Airflow direction 1 The angle of airflow direction 1 can be slightly heightened by changing SWV1 to up Refer to 8 5 P C BOARD MODIFICATION FOR CHANGING AIRFLOW DIRECTION ADJUSTMENT However it may cause the dirt on the ceiling F...

Page 15: ...tects water level above fixed point during a HEAT operation b emergency HEAT operation c standby when during multi system operation d standby when ON timer is set e operation STOP Drain pump operates in conditions 1 or 2 Operation stop condition Condition other than 1 or 2 indicated above 2 Float sensor Float moves with the up and down of water surface inside the drain pan and judges water level F...

Page 16: ... timer setting a Press OFF TIMER 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 disp...

Page 17: ...temperature blinks Pressing selects the day of the week to be set Pressing selects the setting number E g Mon Tue Sun and 1 are selected All days can be selected NOTE The simple ON OFF timer setting is available while the weekly timer is on In this case the ON OFF timer has priority over the weekly timer the weekly timer operation will start again after the simple ON OFF timer is complete When the...

Page 18: ...ng 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 4 Press button to complete and transmit the weekly timer setting which was blink ing goes out and the current time will be displayed 8 10 SMART SET OPERATION 1 How to set SMART SET operation 1 Press STOP OPERATE OFF ON button 2 Select COOL or HEAT mode 3 Press SMART...

Page 19: ...or the operation running when the SLEEP button is pressed It will change to the set temperature for SLEEP operation in about 30 minutes Pressing SLEEP button again returns the operation to the previous settings is pressed is pressed For about 30 minutes Set temperature for the operation before SLEEP operation Set temperature for SLEEP operation Set temperature for the operation before SLEEP operat...

Page 20: ... in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller In the latter case normal operation will start NOTE Do not press EMERGENCY OPERATION switch during normal operation 8 13 3 MINUTE TIME DELAY OPERATION When the system turns OFF compressor will not restart for 3 minutes as 3 minute tim...

Page 21: ...he power supply before removing the front panel the cabinet the top panel and the electronic control P C board 3 When removing the electronic control P C board hold the edge of the board with care NOT to apply stress on the components 4 When connecting or disconnecting the connectors hold the connector housing DO NOT pull the lead wires NTXUKS09A112AA NTXUKS12A112AA NTXUKS18A112AA 3 Troubleshootin...

Page 22: ... 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 4 Release the failure mode recall function according to Releasing the failure mode recall function men tioned above Yes Blinks No OFF NOTE 1 Make sure to release the failure mode recall function after it is set up otherwise the...

Page 23: ...gardless of normal or abnormal 2 short beeps are emitted as the signal is received Does OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0 5 seconds Blinks The outdoor unit is abnormal Beeps are emitted at the same timing as the blinking of OPERATION INDICATOR lamp 2 Deleting the memorized abnormal condition Repair the failure parts With the remote controller headed towards the...

Page 24: ...When the serial signal from the out door unit is not received for a maxi mum of 6 minutes Refer to 9 6 How to check miswir ing and serial signal error 5 time blink 2 5 second OFF Not lit Drain pump Float sensor Float sensor is open Float sensor detects abnormal water level Check the float sensor and the drain pump Check the connectors of float sensor and the drain pump Refer to 9 6 Check of float ...

Page 25: ...tdoor unit Trouble of thermistor in outdoor unit Left lamp 7 time blink Cause Outdoor unit Trouble of outdoor control system Refer to 9 6 How to check miswiring and serial signal error when outdoor unit does not work 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 Refer to How to check the inverter com...

Page 26: ... Refer to the characteristics of indoor coil thermistor and the room temperature thermistor on 9 7 Left lamp blinks 3 time blink 2 5 second OFF When the rotational frequency feedback signal is not emitted during the indoor fan operation Refer to 9 6 Check of indoor fan motor Indoor unit and outdoor unit do not operate Indoor unit and outdoor unit do not operate Left lamp blinks 5 time blink 2 5 se...

Page 27: ...CRITERIA OF MAIN PARTS NTXUKS09A112AA NTXUKS12A112AA NTXUKS18A112AA Part name Figure Check method and criteria Indoor fan motor Measure the resistance with a tester Part temperature 50 F 86 F 10 C 30 C Normal 8 kΩ 20 kΩ Room temperature thermistor RT11 Indoor coil thermistor RT12 RT14 RT15 MAIN RT13 SUB Horizontal vane motor MV1 Measure the resistance between the terminals with a tester Part tempe...

Page 28: ... switch is pressed If more than 12 seconds passes by turn OFF the power supply and turn ON it again then measure the voltage 1 Measure the voltage between CN211 and 2 Measure the voltage between CN211 and 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 Is 0...

Page 29: ... filter on receiving part Replace the receiver P C board Assign a number of remote controller Refer to 7 2 Check if the unit operates with the remote controller Does the unit operate with the remote controller Yes No OK Measure the voltage between receiver P C board connector CN301 and when the remote controller button is pressed Is the voltage approximately 4 V DC 5 V DC No Yes Replace the indoor...

Page 30: ...sistance between CN211 and of the indoor fan motor connector Short open circuit Replace the indoor fan motor Short open circuit Replace the horizontal vane motor the vertical vane motor coil 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 v...

Page 31: ...wer supply Is there 208 230 V AC between outdoor terminal block S1 and S2 Does the left lamp of OPERATION INDICATOR lamp light up Confirmation of the power supply to the indoor unit Press EMERGENCY OPERATION switch once Check the power supply Is the serial signal error indicated 6 minutes later Turn OFF the power supply Check once again if the indoor outdoor connecting wire is not wrongly connecte...

Page 32: ...o Is there 208 230 V AC between CN1N1 and Is there large amount of water in drain pan 1 Refer to 9 5 when float sensor can be checked Yes Replace the indoor electronic control P C board Replace the indoor electronic control P C board Replace the indoor electronic control P C board Check power supply voltage No Replace the float sensor Yes Remove clog from drain hose No Replace the drain pump No No...

Page 33: ... strength or the 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 ...

Page 34: ...C GND High voltage DC 0 or 15 V DC 5 V DC GND Timer short mode point 2 points Refer to 8 1 SWV1 Changing air flow direction Refer to 8 5 CN151 Vane motor connector Receiver P C board Factory setting Do not change the setting ON OFF 1 2 3 4 5 6 SW101 CN105 Connector to optional interface Modifica tion point for individual operation Refer to 8 2 Indoor coil ther mistor RT13 SUB CN113 Indoor coil the...

Page 35: ...e locking mechanism can be detached as shown below There are following 2 types of the terminal with locking mechanism The terminal without locking mechanism can be detached by pulling it out Check the shape of the terminal before detaching Detaching method of the terminal with locking mechanism Connector Sleeve Locking lever NTXUKS09A112AA NTXUKS12A112AA NTXUKS18A112AA NOTE Turn OFF the power supp...

Page 36: ...t fits closely with the ceiling surface Loosely fasten with the provided fixing screws at 4 places on the left and right side Figure 6 5 Tighten the fixing screws at 2 places in the middle and the fixing screw in the center Figure 6 6 Tighten the fixing screws at 4 places on the left and right sides NOTE Make sure there are no gaps between the indoor unit and the grille or between the grille and t...

Page 37: ...d right sides Check after installing 1 Check that there are no gaps between the indoor unit and the grille or between the grille and the ceiling surface NOTE If there are any gaps the wind may come in and it may cause water to drip 2 Check that the screw cap is installed 3 Check that the left and right side panels are installed securely 4 Check that the emergency operation switch is installed secu...

Page 38: ...nd 5 Disconnect the connectors of the horizontal and vertical vane motors 6 Remove the indoor coil thermistors main and sub 7 Remove the drain cover 3 fixing screws 8 Remove the pipe band 9 Remove the heat exchanger 6 fixing screws 10 Remove the stabilizer 2 fixing screws 5 Removing the horizontal and vertical vane motors 1 Remove the grille 2 Remove the drain pan 3 Remove the horizontal vane 4 Re...

Page 39: ...trings to the tabs on the side plate of indoor heat exchanger 9 Remove the indoor heat exchanger 6 fixing screws and slide it downward 10 Remove the stabilizer 2 fixing screws 11 Partially slide the indoor electric control P C board out 12 Disconnect the connector CN211 of indoor fan motor 13 Remove the motor band 2 fixing screws Figure 6 14 Remove the indoor fan motor and line flow fan No need to...

Page 40: ...IC CORPORATION Published Oct 2018 No OBHT802 Made in Japan Specifications are subject to change without notice MITSUBISHI ELECTRIC TRANE HVAC US LLC HEAD OFFICE 1340 SATELLITE BOULEVARD SUWANEE GA 30024 USA Publication No DL SVG031A EN ...

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