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INDOOR UNIT
INDOOR UNIT
SERVICE MANUAL
Models
NTXWST30A112AA
NTXWST36A112AA
NTYWST30A112AA
NTYWST36A112AA
OBHT501A
Revision A:
• 9-7. TEST POINT DIAGRAM AND VOLTAGE has
been modified.
OBHT501 is void.
Outdoor unit service manual
NTXSST•A112AA Series (OBHT502)
NTYSST•A112AA Series (OBHT502)
CONTENTS
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. OUTLINES AND DIMENSIONS ························ 7
5. WIRING DIAGRAM ············································ 8
6. REFRIGERANT SYSTEM DIAGRAM ··············· 9
7. SERVICE FUNCTIONS ··································· 10
8. MICROPROCESSOR CONTROL ··················· 12
9. TROUBLESHOOTING ····································· 19
10. DISASSEMBLY INSTRUCTIONS ···················· 31
PARTS CATALOG (OBBT501)
No. OBHT501
REVISED EDITION-A
·······································
3
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric TRANE NTXWST30A112AA
Summary of Contents for Mitsubishi Electric TRANE NTXWST30A112AA
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Page 1: Table Of Contents
Revision A: • 9-7. TEST POINT DIAGRAM AND VOLTAGE has been modified. OBHT501 is void. INDOOR UNIT INDOOR UNIT No. OBHT501 REVISED EDITION-A SERVICE MANUAL Models NTXWST30A112AA NTXWST36A112AA NTYWST30A112AA NTYWST36A112AA Outdoor unit service manual NTXSST•A112AA Series (OBHT502) NTYSST•A112AA Series (OBHT502) CONTENTS 1. - Page 2 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 failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions.
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Page 3: Technical Changes
TECHNICAL CHANGES NTXWST30A112AA NTXWST36A112AA NTYWST30A112AA NTYWST36A112AA 1. New model OBHT501A... -
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS NTXWST30A112AA NTXWST36A112AA NTYWST30A112AA NTYWST36A112AA Air cleaning fi lter (Anti-Allergy Enzyme Filter) Front panel Air fi lter (Catechin air fi lter) Air inlet Emergency operation switch Air outlet Operation indicator Horizontal vane lamp Remote control Remote controller receiving section ACCESSORIES NTXWST30A112AA... -
Page 5: Specification
SPECIFICATION Model NTXWST30A112AA NTYWST30A112AA NTXWST36A112AA NTYWST36A112AA Power supply V, phase, Hz 208/230, 1, 60 Max. fuse size (time delay)/ Disconnect switch Min. circuit ampacity Fan motor F.L.A 0.76 COOL Dry 389 - 639 - 848 - 887 Airflow (Wet) (350 - 576 -763 - 798) Low - Med. -
Page 6: Operation
3-1. OPERATING RANGE (1) POWER SUPPLY Rated voltage Guaranteed voltage (V) 208/230 V Min. 187 Max. 253 Indoor unit 1 phase 60 Hz (2) OPERATION Intake air temperature (°F) Mode Condition Indoor Outdoor Standard temperature — Maximum temperature — Cooling Minimum temperature —... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS NTXWST30A112AA NTXWST36A112AA NTYWST30A112AA NTYWST36A112AA Unit: inch Indoor unit 2-11/16 4-11/16 45-1/2 20-7/8 17-11/16 2-3/16 5-3/8 11-5/8 Wall hole ø3 Air in 46-1/16 Installation plate Piping Drain hose 2-15/16 33-11/16 9-1/2 2-5/8 Air out 5-7/8 Piping Insulation 2-5/16 Liquid line ø3/8 19-11/16 ø1-1/4 O.D... -
Page 8: Wiring Diagram
WIRING DIAGRAM NTXWST30A112AA NTXWST36A112AA NTYWST30A112AA NTYWST36A112AA OBHT501A... -
Page 9: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM NTXWST30A112AA NTXWST36A112AA NTYWST30A112AA NTYWST36A112AA Unit: inch Refrigerant pipe ø5/8 (with heat insulator) Indoor Indoor coil heat Flared connection thermistor exchanger RT12 (Main) Indoor coil Distributor Joint thermistor RT13 (Sub) Joint connection Room temperature thermistor RT11 Strainer Flared connection Refrigerant pipe ø3/8 (with heat insulator) Refrigerant flow in cooling... -
Page 10: Service Functions
SERVICE FUNCTIONS NTXWST30A112AA NTXWST36A112AA NTYWST30A112AA NTYWST36A112AA 7-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board. The time will be shortened as follows. (Refer to 9-7.) Set time : 1-minute 1-second Set time : 3-minute... -
Page 11: Auto Restart Function
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 shut-off of the main power. Operation If the main power has been cut, the operation settings remain. -
Page 12: Microprocessor Control
MICROPROCESSOR CONTROL NTXWST30A112AA NTXWST36A112AA NTYWST30A112AA NTYWST36A112AA WIRELESS REMOTE CONTROLLER * These pictures show NTXWST type. Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button VANE CONTROL button FAN SPEED (Horizontal vane button) CONTROL button Temperature buttons OFF TIMER button OPERATION SELECT button ECONO COOL button ON TIMER button TIME SET buttons... -
Page 13: Dry Operation
8-1. COOL ( ) OPERATION (1) Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 61 ~ 88°F (16 ~ 31°C). - Page 14 (4) The initial set temperature is decided by the initial room temperature. Model Initial room temperature Initial set temperature 79°F (26°C) or more 75°F (24°C) COOL mode of "I FEEL CONTROL" 77°F (25°C) to 79°F (26°C) Initial room temperature minus 4°F (2°C) DRY mode of "I FEEL More than 55°F (13°C), Initial room temperature minus 4°F (2°C)
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Page 15: Auto Vane Operation
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. -
Page 16: Swing Mode
2. Vertical vane (1) Vane motor drive These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approximately 12 V) transmitted from microprocessor. (2) The vertical vane angle and mode change as follows by pressing WIDE VANE button. SWING (3) Positioning To confirm the standard position, the vane moves until it touches the vane stopper. -
Page 17: Timer Operation
8-8. 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 “0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button. How to set the current time (a) Press the CLOCK set button. -
Page 18: Emergency/Test Operation
8-9. EMERGENCY/TEST OPERATION In case of test run operation or emergency operation, use the emergency operation switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing or has failed, or when the batteries in the remote controller are running down. -
Page 19: Troubleshooting
TROUBLESHOOTING NTXWST30A112AA NTXWST36A112AA NTYWST30A112AA NTYWST36A112AA 9-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after confirm- ing the horizontal vane is closed, turn off the breaker and/or disconnect the power plug. - Page 20 9-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur.
- Page 21 2. Table of indoor unit failure mode recall function Left lamp of OP- Abnormal point ERATION INDICA- Condition Remedy (Failure mode) TOR lamp Not lit Normal — — The room temperature thermistor short or open 1-time blink every Room temperature Refer to the characteristics of the room temperature circuit is detected every 8 seconds during op- 0.5-second...
- Page 22 9-3. INSTRUCTION OF TROUBLESHOOTING Start Indoor unit operates. OPERATION INDICATOR Indoor unit operates. Indoor unit does not Outdoor unit does Outdoor unit does receive the signal lamp on the indoor unit is not operate. not operate normally. from remote controller. blinking on and off.
- Page 23 9-4. TROUBLESHOOTING CHECK TABLE Before taking measures, make sure that the symptom reappears for accurate troubleshooting. When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp blinks. OPERATION INDICATOR Blinking Not lit...
- Page 24 9-5. TROUBLESHOOTING CRITERION OF MAIN PARTS NTXWST30A112AA NTXWST36A112AA NTYWST30A112AA NTYWST36A112AA Part name Check method and criterion Figure Room temperature therm- Measure the resistance with a multimeter. istor (RT11) Indoor coil thermistor Refer to 9-7. "TEST POINT DIAGRAM AND VOLTAGE", "Indoor electronic (RT12 (MAIN), RT13 control P.C.
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Page 25: Troubleshooting Flow
9-6. TROUBLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred, and the indoor fan does not operate. Turn OFF the power supply. Pay enough attention to the high voltage on the fan motor connector CN211. Turn ON the power supply, wait 5 seconds or more, and then press the emergency operation switch. - Page 26 B Check of remote controller and receiver P.C. board *Check if the remote controller is exclusive for this air conditioner. Switch ON the remote controller. Is LCD display on the remote controller Replace the batteries. (Refer to 9-1.4.) visible? (Not clear) Remove the batteries, then set them back and press RESET button.
- Page 27 C Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN211 Measure the resistance between Short circuit: CN211 of the indoor fan motor and vane motor connector CN151 from the Replace the indoor fan motor.
- Page 28 D How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage AC in Check the power supply. the power supply? Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and Check the wiring.
- Page 29 E Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 9.91 ft., or is the indoor unit, and/or the antennas and the the distance between the antennas and outdoor unit.
- Page 30 9-7. TEST POINT DIAGRAM AND VOLTAGE NTXWST30A112AA NTXWST36A112AA NTYWST30A112AA NTYWST36A112AA Indoor electronic control P.C. board Power supply input Cement Varistor (NR11) 208/230 V AC resistor Release of Auto restart (R111) Fuse (F11) function T3.15AL250V approximately Solder the Jumper wire 4Ω to JR07 (Refer to 7-3.) Indoor fan motor...
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Page 31: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <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 locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 32 OPERATING PROCEDURE PHOTOS/FIGURES Photo 3 3. Removing the nozzle assembly (1) Remove the panel and the corner box. (Refer to section 1.) (2) Remove the electrical cover. (Refer to section 2.) (3) Remove the electrical side cover, disconnect the vane Screw of the motor connector.
- Page 33 OPERATING PROCEDURE PHOTOS/FIGURES Photo 7 6. Removing the line flow fan and the indoor fan motor (1) Remove the panel and the corner box. (Refer to section 1.) (2) Remove the electrical box. (Refer to section 2.) Screw of the motor band (3) Remove the nozzle assembly.
- Page 34 Mount the clip-shape part on the marked position. Do not pull the lead wire when removing the indoor coil thermistor. MITSUBISHI ELECTRIC TRANE HVAC US LLC HEAD OFFICE: 1340 SATELLITE BOULEVARD, SUWANEE, GA 30024, USA © Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Nov.
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