Mitsubishi Electric Trane NTXWPH06B112AA Service Manual Download Page 1

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INDOOR UNIT

SERVICE MANUAL

INDOOR UNIT

No. OBHT872

PARTS CATALOG (OBBT872)

Outdoor unit service manual

NTXSPB/SPH∙B112AA Series (OBHT873)

NTXMMX/MPH∙A122AA Series (OBHT702)

CONTENTS

1. TECHNICAL CHANGES

······························

2. PART NAMES AND FUNCTIONS ··················4

3. SPECIFICATION

·········································5

4. OUTLINES AND DIMENSIONS ·····················6

5. WIRING DIAGRAM ·····································7

6. REFRIGERANT SYSTEM DIAGRAM ·············8

7. SERVICE FUNCTIONS ································9

8. MICROPROCESSOR CONTROL ·················

9. TROUBLESHOOTING ·······························

10. DISASSEMBLY INSTRUCTIONS

·················

Models

NTXWPH06B112AA

NTXWPH09B112AA

NTXWPH12B112AA

NTXWPH15B112AA

NTXWPH18B112AA

Summary of Contents for Trane NTXWPH06B112AA

Page 1: ...eries OBHT702 CONTENTS 1 TECHNICAL CHANGES 3 2 PART NAMES AND FUNCTIONS 4 3 SPECIFICATION 5 4 OUTLINES AND DIMENSIONS 6 5 WIRING DIAGRAM 7 6 REFRIGERANT SYSTEM DIAGRAM 8 7 SERVICE FUNCTIONS 9 8 MICROPROCESSOR CONTROL 11 9 TROUBLESHOOTING 20 10 DISASSEMBLY INSTRUCTIONS 33 Models NTXWPH06B112AA NTXWPH09B112AA NTXWPH12B112AA NTXWPH15B112AA NTXWPH18B112AA ...

Page 2: ...xplosion 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 failure system malfunction unit breakdown or accidents caused by failure to follow the instructions OBHT872 ...

Page 3: ...3 1 TECHNICAL CHANGES NTXWPH06B112AA NTXWPH09B112AA NTXWPH12B112AA NTXWPH15B112AA NTXWPH18B112AA 1 New model OBHT872 ...

Page 4: ...less remote controller 1 Felt tape For left or left rear piping 1 Air cleaning filter Electrostatic anti allergy enzyme filter 1 Air cleaning filter Deodorizing filter 1 Operation indicator lamp Remote control receiving section Emergency operation switch Horizontal vane Air inlet Air ﬁlter Nano platinum ﬁlter Air cleaning ﬁlter Electrostatic anti allergy enzyme ﬁlter and deodorizing ﬁter Front pan...

Page 5: ... 0 Wet 364 16 2 24 8 NTXWPH15B112AA HEAT Dry 514 23 0 34 9 COOL Dry 437 19 5 29 8 Wet 376 16 7 25 6 NTXWPH18B112AA HEAT Dry 514 23 0 34 9 COOL Dry 437 19 5 29 8 Wet 376 16 7 25 6 Indoor unit model NTXWPH06B112AA NTXWPH09B112AA NTXWPH12B112AA NTXWPH15B112AA NTXWPH18B112AA 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 65 Airflow Super high H...

Page 6: ...6 4 OUTLINES AND DIMENSIONS Unit inch NTXWPH06B112AA NTXWPH09B112AA NTXWPH12B112AA NTXWPH15B112AA NTXWPH18B112AA NTXWPH06 09 12B112AA NTXWPH15 18B112AA OBHT872 ...

Page 7: ...7 5 WIRING DIAGRAM NTXWPH06B112AA NTXWPH09B112AA NTXWPH12B112AA NTXWPH15B112AA NTXWPH18B112AA OBHT872 ...

Page 8: ...tor RT13 sub Refrigerant flow in cooling Refrigerant flow in heating Unit inch mm Indoor heat exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø1 2 ø12 7 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 in heating NTXWPH15B1...

Page 9: ... you turn the breaker ON the remote controller that first sends a signal to an indoor unit will be regarded as the remote controller for the indoor unit Once they are set the indoor unit will only receive the signal from the assigned remote controller afterwards 7 3 SETTING THE INSTALLATION POSITION Be sure to set the remote controller according to the installed position of the indoor unit Install...

Page 10: ...d 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 prevent breaker ...

Page 11: ...ed Blinking Not lighted Signal transmitting section Operation display section Backlight display Temperature buttons OFF ON stop operate button Indication of remote controller model is on back Distance of signal About 20 ft 6 m Beep s is are heard from the indoor unit when the signal is received FAN speed control button INDIRECT DIRECT button ECONO COOL button POWERFUL button CLOCK button Lid Slide...

Page 12: ...de temperature operation works the same way as that in COOL mode 8 1 2 8 3 FAN OPERATION 1 OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select FAN mode with Operation select button 3 Select the desired fan speed When AUTO it becomes Low Only indoor fan operates Outdoor unit does not operate 8 1 COOL OPERATION 1 Press OFF ON stop operate button OPERATION INDICATOR lamp of...

Page 13: ...t 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 POWERFUL or NATURAL FLOW button Horizontal position 4 In COOL and DRY operation Vane angle is fixed to Horizontal position In HEAT operat...

Page 14: ...utton the vertical vane swings horizontally The remote controller displays Swing mode is cancelled when WIDE VANE button is pressed once again 8 7 TIMER OPERATION 1 How to set the time 1 Check that the current time is set correctly NOTE Timer operation will not work without setting the current time Initially 12 00 AM blinks at the current time display of TIME MONITOR so set the current time correc...

Page 15: ...in after the simple ON OFF timer is 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 Example 1 The current time is 8 00 PM The unit turns off at 11 00 PM and on at 6 00 AM OFF timer and ON timer can be used in combination The set time that is reached first will operate first and display shows th...

Page 16: ...lected All days can be selected 1 How to set the weekly timer Press and buttons to continue setting the timer for other days and or numbers NOTE Press button to transmit the setting information of weekly timer to the indoor unit Point the remote controller toward the indoor unit for 3 seconds When setting the timer for more than one day of the week or one number button does not have to be pressed ...

Page 17: ...on 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 5 Press button to turn the weekly timer ON lights When the weekly timer is ON the day of the week whose timer setting is complete will light Press button again to turn the weekly timer OFF goes out NOTE The saved settings will not be ...

Page 18: ... and the weekly timer operation cannot be used together 2 How to cancel operation Press SMART SET button again SMART SET operation can also be cancelled by pressing Operation select button to change the operation mode The same setting is select from the next time by simply pressing SMART SET button 8 10 INDIRECT DIRECT MODE The INDIRECT DIRECT mode offers finely tuned operation by locating where a...

Page 19: ...eration the horizontal vane operates in VANE AUTO mode The emergency operation continues until the 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 the emergency operation switch during normal operation Operation mode COOL HEAT Set temperature 75 F 24 C Fan speed Med Horiz...

Page 20: ...ing ser vice work 2 Before servicing verify that all 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 repl...

Page 21: ...lure mode recall function mentioned above Press OFF ON stop operate button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit Press the 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 men tioned above Yes Bl...

Page 22: ... emitted for 12 seconds after the indoor fan motor is operated Refer to 9 6 Check of indoor fan motor 12 time blink 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 NOTE Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE 9 4 3 Operati...

Page 23: ...ink Cause Outdoor unit Trouble of thermistor in outdoor unit LEFT lamp 7 time blink Cause Outdoor unit Trouble of outdoor control system LEFT lamp 14 time blink or more Cause Outdoor unit Other abnormality Indoor Outdoor unit Trouble of ther mistors Start Refer to 9 6 How to check miswiring and serial signal error Check room temperature thermistor and indoor coil thermis tor Refer to 9 7 Test poin...

Page 24: ...ime blink 2 5 second OFF It consecutively occurs 3 times that the com pressor stops for overcurrent protection or start up failure protection within 1 minute after start up Refer to How to check of in verter compressor Refer to outdoor unit service manual Check the stop valve 6 Outdoor thermistors LEFT lamp blinks 6 time blink 2 5 second OFF The outdoor thermistors short or open circuit during the...

Page 25: ...Check of indoor fan motor Vane motor MV1 HORIZONTAL Measure the resistance between the terminals with a tester Temperature 50 86 F 10 30 C Color of the lead wire Normal RED SKY 262 328 Ω SKY SKY RED SKY SKY ROTOR Vane motor MV2 VERTICAL Measure the resistance between the terminals with a tester Temperature 50 86 F 10 30 C Color of the lead wire Normal RED SKY 219 273 Ω SKY SKY RED SKY SKY ROTOR i ...

Page 26: ...s 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 power P C board rise to the range of 3 to 6 VDC 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 ...

Page 27: ...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 No 1 and No 3 when the remote controller button is pressed Is the voltage approximately 4 VDC 5 VDC No Yes Replace the indoor electronic control P C board 1 Look at the image of the signal transmittin...

Page 28: ... board No No Replace the indoor power 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 control P C board 1 The fan motor connector s lead wire is red whereas is black 2 Connect of the tester to fan motor connector s lead wire and to lead wire o...

Page 29: ...ond OFF and 0 8 second ON quick blinking 3 Yes No Lighted or not lighted Replace the inverter P C board 2 2 Be careful of the residual voltage of smoothing capacitor Is there amplitude of 10 to 20 VDC between the indoor terminal block S2 and S3 Confirmation of serial signal Yes Check the wiring If there are any errors of the indoor outdoor connecting wire such as the damage of the wire intermediat...

Page 30: ...S1 and S2 Confirmation of power voltage Replace the indoor electronic control P C board 2 Be careful of the residual voltage of smoothing capacitor Replace the outdoor control P C board 2 Is there any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection poor contact to the terminal block Replace the indoor outdoor connecting wire Is serial signal error...

Page 31: ...d 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 32: ...ard Switch board Resistor R111 GND 5 VDC GND Timer short mode point JPG JPS Refer to 7 1 To disable Auto restart function cut the Jumper wire to JR77 Refer to 7 4 Emergency operation switch E O SW SW1 Connector to indoor power P C board CN102 Indoor coil thermistor RT12 RT13 CN112 9 7 TEST POINT DIAGRAM AND VOLTAGE 12 VDC 5 VDC i see SENSOR MOTOR MT i see sensor pin pin pin pin CN110 Vane motor MV...

Page 33: ...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 terminal with locking mechanism The terminal without locking mechani...

Page 34: ...tdoor connecting wire 8 Remove the ground wire connected to the indoor heat exchanger from the electrical box 9 Remove the screw fixing the electrical box then the upper catch of the electrical box and pull out the electrical box When installing the electrical box pass the lead wire from the fan motor through Photo 10 and Photo 4 so that it will not be pinched under the electrical box Photo 3 Phot...

Page 35: ...lock CN202 To the indoor electronic control P C board 5 Remove the lead wire holder 6 Remove the indoor power P C board 7 Disconnect the following connectors Indoor electronic control P C board CN111 Room temperature thermistor CN112 Indoor coil thermistor 8 Unhook the catches of the DISPLAY AND i see SENSOR ASSEMBLY from the electrical box right side 9 Unhook the catch of the rear cover of the DI...

Page 36: ...w of the vertical vane motor unit and pull out the vertical vane motor unit 3 Remove the screws of the vertical vane motor unit cover 4 Disconnect the connector from the vertical vane motor 5 Remove the vertical vane motor from the vertical motor unit cover 6 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to section 4 2 Remove the screws of the horizontal vane motor unit and...

Page 37: ...he 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 Photo 10 9 Remove the screws fixing the left side and the 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 line flow fan so 4 mm gap i...

Page 38: ...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 part About the same length Copyright 2020 MITSUBISHI ELECTRIC CORPORATION Published Nov 2020 No OBHT872 Made in Japan M...

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