Mitsubishi Electric TRANE NTXSST09B112AA Service Manual
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Mitsubishi Electric TRANE NTXSST09B112AA Service Manual

Mitsubishi Electric TRANE NTXSST09B112AA Service Manual

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OUTDOOR UNIT
SERVICE MANUAL
Models
NTXSST09B112AA NTXSSH09A112AA
NTXSST12B112AA NTXSSH12A112AA
NTXSST15B112AA NTXSSH15A112AA
NTXSST18B112AA NTXSSH18A112AA
NTXSST24B112AA NTXSSH24A112AA
NTXSST30B112AA
NTXSST30C112AA
NTXSST36B112AA
NTXSST36C112AA
NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA
NTYSST30B112AA NTYSST30C112AA
NTYSST36B112AA NTYSST36C112AA
Revision A:
• NTXSST09/12/15/18/24B112AA,
NTXSSH09/12/15/18/24A112AA,
NTXSST30/36C112AA,
NTYSST09/12/15/18/24B112AA and
NTYSST30/36C112AA have been added.
OBHT875 is void.
HFC
utilized
R410A
NTYSST09B112AA
NTYSST12B112AA
NTYSST15B112AA
NTYSST18B112AA
NTYSST24B112AA
NTYSST30B112AA
NTYSST30C112AA
NTYSST36B112AA
NTYSST36C112AA
Indoor unit service manual
NTXWST/NTYWST•B•AA Series (OBHT874)
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ··················· 10
5. WIRING DIAGRAM ··································· 12
6. REFRIGERANT SYSTEM DIAGRAM ··········· 20
7. DATA ······················································ 25
8. ACTUATOR CONTROL ····························· 54
9. SERVICE FUNCTIONS ······························ 55
10. TROUBLESHOOTING ······························· 56
11. DISASSEMBLY INSTRUCTIONS ················· 84
PARTS CATALOG (OBBT875)
No. OBHT875
REVISED EDITION-A

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Summary of Contents for Mitsubishi Electric TRANE NTXSST09B112AA

  • Page 1: Table Of Contents

    Revision A: • NTXSST09/12/15/18/24B112AA, NTXSSH09/12/15/18/24A112AA, NTXSST30/36C112AA, NTYSST09/12/15/18/24B112AA and NTYSST30/36C112AA have been added. OBHT875 is void. OUTDOOR UNIT No. OBHT875 utilized REVISED EDITION-A SERVICE MANUAL R410A Models NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA NTXSST18B112AA NTXSSH18A112AA NTYSST18B112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30B112AA NTYSST30B112AA...

  • Page 2: Ntxsst18B112Aa Ntxssh18A112Aa Ntysst18B112Aa

    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.

  • Page 3: Part Names And Functions

    PART NAMES AND FUNCTIONS NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA Air inlet (back and side) Piping Air outlet Drain hose Drain outlet NTXSST18B112AA NTXSSH18A112AA NTYSST18B112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30B112AA NTYSST30B112AA NTXSST30C112AA NTYSST30C112AA NTXSST36B112AA NTYSST36B112AA NTXSST36C112AA NTYSST36C112AA Air inlet (back and side) Piping Air outlet...

  • Page 4: Specification

    SPECIFICATION NTXSST09B112AA Outdoor unit model NTXSSH09A112AA NTYSST09B112AA Cooling * Btu/h 9,000 (3,600 – 12,200) Capacity Rated (Minimum – Maximum) Heating 47 * Btu/h 10,900 (3,600 – 15,900) 9,600 (3,600 – 15,900) Capacity Heating 17 * Btu/h 6,500 (10,200) 5,700 (11,500) Rated (Maximum) Cooling * 585 (240 –...
  • Page 5 NTXSST12B112AA NTXSST15B112AA Outdoor unit model NTXSSH12A112AA NTXSSH15A112AA NTYSST12B112AA NTYSST15B112AA Cooling * Btu/h 12,000 (1,500 – 13,600) 14,000 (3,100 – 18,200) Capacity 14,400 12,300 18,000 14,000 Rated (Minimum – Maximum) Heating 47 * Btu/h (1,500 – 18,100) (3,600 – 18,100) (4,800 – 20,900) (4,800 –...
  • Page 6 NTXSST18B112AA NTXSST24B112AA Outdoor unit model NTXSSH18A112AA NTXSSH24A112AA NTYSST18B112AA NTYSST24B112AA Cooling * Btu/h 18,000 (5,800 – 22,000) 22,400 (8,200 – 31,400) Capacity NA:21,600 19,000 27,600 21,200 Rated (Minimum – Maximum) Heating 47 * Btu/h NAH:20,600 (6,600 – 25,000) (7,500 – 31,400) (7,500 –...
  • Page 7 Outdoor unit model NTXSST30B112AA NTYSST30B112AA NTXSST36B112AA NTYSST36B112AA 32,000/33,200 Cooling * Btu/h 30,700 (10,300 – 30,700) (10,300 – 32,000)/(10,300 – 33,200) Capacity Rated (Minimum – Maximum) 32,600 35,200 Heating 47 * Btu/h – – (9,800 – 34,000) (9,800 – 36,000) Capacity Heating 17 * Btu/h 20,000 (20,800)
  • Page 8 Outdoor unit model NTXSST30C112AA NTYSST30C112AA NTXSST36C112AA NTYSST36C112AA Cooling * Btu/h 30,600 (10,300 – 30,700) 33,200 (10,300 – 33,200) Capacity 32,600 35,200 Rated (Minimum – Maximum) Heating 47 * Btu/h – – (9,800 – 34,000) (9,800 – 36,000) Capacity Heating 17 * Btu/h 20,000 (20,800) –...

  • Page 9: Test Condition

    Test condition *3, *4 AHRI Indoor air condition (°F) Outdoor air condition (°F) Mode Test 210/240 Dry bulb Wet bulb Dry bulb Wet bulb “A-Full” Cooling Steady State (75) at rated compressor speed “B-Full” Cooling Steady State (65) at rated compressor speed SEER “B-Low”...

  • Page 10: Outlines And Dimensions

    OUTLINES AND DIMENSIONS NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA Unit: inch REQUIRED SPACE 4 in. (100 mm) or more when front and sides of the unit are clear (NTXSST09/12/15 NTYSST09/12/15) (NTXSSH09/12/15 NTYSST09/12/15) When any 2 sides of left, right and rear of the unit are clear holes Liquid refrigerant pipe joint...
  • Page 11 NTXSST18B112AA NTXSSH18A112AA NTYSST18B112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30B112AA NTYSST30B112AA NTXSST30C112AA NTYSST30C112AA NTXSST36B112AA NTYSST36B112AA NTXSST36C112AA NTYSST36C112AA Unit: inch REQUIRED SPACE 4 in OR MORE. 14 in OR MORE. 16-7/16 AIR IN ↓ DRAIN HOLE ø1-21/32 → 20 in OR MORE. AIR IN OPEN TWO SIDES OF RIGHT 4 in OR MORE.

  • Page 12: Wiring Diagram

    WIRING DIAGRAM NTXSST09B112AA NTXSST12B112AA NTXSST15B112AA OBHT875A...
  • Page 13 NTXSSH09A112AA NTXSSH12A112AA NTXSSH15A112AA OBHT875A...
  • Page 14 NTYSST09B112AA NTYSST12B112AA NTYSST15B112AA OBHT875A...
  • Page 15 NTXSST18B112AA NTXSSH18A112AA NTXSSH24A112AA OBHT875A...
  • Page 16 NTYSST18B112AA NTXSST24B112AA OBHT875A...
  • Page 17 NTYSST24B112AA NTXSST30B112AA NTXSST36B112AA OBHT875A...
  • Page 18 NTYSST30B112AA NTYSST36B112AA NTXSST30C112AA NTXSST36C112AA OBHT875A...
  • Page 19 NTYSST30C112AA NTYSST36C112AA OBHT875A...

  • Page 20: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA Unit: inch (mm) NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA Refrigerant pipe ø3/8 (ø9.52) (NTXSST, NTXSSH, NTYSST09/12) ø1/2 (ø12.7) (NTXSST, NTXSSH, NTYSST15) 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler...
  • Page 21 NTXSSH18A112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA Service port Unit: inch (mm) Refrigerant pipe (high pressure) ø1/2 (ø12.7) (NTXSSH18) Muffler ø5/8 (ø15.88) (NTXSST, NTXSSH, NTYSST24) with #100 mesh strainer (with heat insulator) 4-way valve Stop Muffler valve Outdoor Discharge Flared connection heat Ambient temperature (NTX only...
  • Page 22 NTXSST30C112AA NTXSST36C112AA Service port Unit: inch (mm) (high pressure) Muffler Refrigerant pipe ø5/8 (ø15.88) 4-way valve (with heat insulator) Strainer #100 Stop valve Outdoor Discharge Flared connection heat Ambient temperature exchanger temperature Defrost Service port thermistor thermistor (low pressure) thermistor RT62 RT65 RT61...
  • Page 23 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Piping size O.D: in. Max. Height difference Model Max. Length Liquid NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA NTXSST18B112AA NTXSSH18A112AA NTYSST18B112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30B112AA NTXSST30C112AA NTYSST30B112AA NTYSST30C112AA NTXSST36B112AA NTXSST36C112AA...

  • Page 24: Additional Refrigerant Charge (R410A: Oz.)

    ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Refrigerant piping length (one way): ft. Outdoor unit Model precharged NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA 2 lb. 9 oz. 1.08 3.24 5.40 7.56 8.64...

  • Page 25: Data

    DATA NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA NTXSST18B112AA NTXSSH18A112AA NTYSST18B112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30B112AA NTYSST30B112AA NTXSST30C112AA NTYSST30C112AA NTXSST36B112AA NTYSST36B112AA NTXSST36C112AA NTYSST36C112AA 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Outdoor intake air DB temperature (˚F) Indoor air Model IWB (˚F) 11.0 0.77 0.52...
  • Page 26 Outdoor intake air DB temperature (˚F) Indoor air Model IWB (˚F) 0.77 0.65 0.77 0.67 NTXSST09B112AA NTYSST09B112AA 0.90 0.62 0.90 0.65 NTXSSH09A112AA 1.03 0.60 1.03 0.62 12.0 0.64 1.02 11.0 0.64 1.06 NTXSST12B112AA NTYSST12B112AA 11.2 0.77 0.98 10.3 0.77 1.02 NTXSSH12A112AA 10.3 0.90...
  • Page 27 2) COOLING CAPACITY CORRECTIONS Refrigerant piping length (one way: ft.) 25 (std.) NTXSST09B112AA NTYSST09B112AA NTXSSH09A112AA NTYSST12B112AA NTXSST12B112AA NTYSST15B112AA 0.988 0.967 NTXSSH12A112AA NTXSST15B112AA NTXSSH15A112AA NTXSST18B112AA NTYSST18B112AA 0.985 0.963 0.933 NTXSSH18A112AA NTXSST24B112AA NTYSST24B112AA 0.983 0.956 0.921 NTXSSH24A112AA NTXSST30B112AA NTYSST30B112AA 0.976 0.937 0.887 NTXSST30C112AA NTYSST30C112AA NTXSST36B112AA...

  • Page 28: Heating Capacity

    4) HEATING CAPACITY Outdoor intake air WB temperature (˚F) Indoor air Model IDB (˚F) 0.42 0.54 0.63 0.70 10.6 0.74 11.0 0.75 12.4 0.78 NTXSST09B112AA 0.41 0.52 0.62 0.68 10.9 0.72 11.2 0.73 12.7 0.76 0.39 0.50 0.59 10.0 0.67 11.2 0.70 11.6...

  • Page 29: Performance Curve

    How to operate with fixed operational frequency of the compressor. 1. Press the emergency operation switch on the front of the indoor unit, and select either EMERGENCY COOL mode or EMERGENCY HEAT mode before starting to operate the air conditioner. 2.
  • Page 30 NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA SHF at rating condition = 0.75 = 631 CFM Airflow Outdoor intake air DB temperature (°F) NTXSST30B112AA NTYSST30B112AA NTXSST30C112AA NTYSST30C112AA SHF at rating condition = 0.72 SHF at rating condition = 0.72 Airflow = 823 CFM Airflow = 839 CFM Outdoor intake air DB temperature (°F) Outdoor intake air DB temperature (°F)

  • Page 31: Ntxssh09A112Aa

    Heating Heating capacity (at Rated frequency) Outdoor intake air WB temperature (°F) NTXSST09B112AA NTXSSH09A112AA = 390 CFM = 390 CFM Airflow Airflow Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) NTXSST12B112AA NTXSSH12A112AA Airflow = 390 CFM Airflow = 390 CFM Outdoor intake air WB temperature (°F)

  • Page 32: Ntxsst24B112Aa

    NTXSST24B112AA NTXSSH24A112AA Airflow = 701 CFM Airflow = 701 CFM Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) NTXSST30B112AA NTXSST30C112AA Airflow = 803 CFM Airflow = 816 CFM Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) NTXSST36B112AA NTXSST36C112AA = 803 CFM...
  • Page 33 7-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Air flow should be set to High speed. NTXSST09B112AA NTYSST09B112AA (psig) (psig) (°F) (°F) 95 100 105 110 115 95 100 105 110 115 Outdoor ambient temperature Outdoor ambient temperature NTXSSH09A112AA (psig)
  • Page 34 NTXSST12B112AA NTYSST12B112AA (psig) (psig) (°F) (°F) 95 100 105 110 115 95 100 105 110 115 Outdoor ambient temperature Outdoor ambient temperature NTXSSH12A112AA (psig) (psig) (°F) 95 100 105 110 115 (°F) 95 100 105 110 115 Outdoor ambient temperature Outdoor ambient temperature NTXSST15B112AA NTYSST15B112AA (psig)
  • Page 35 NTXSST18B112AA NTYSST18B112AA (psig) (psig) (°F) (°F) 95 100 105 110 115 95 100 105 110 115 Outdoor ambient temperature Outdoor ambient temperature NTXSSH18A112AA (psig) (psig) (°F) (°F) 95 100 105 110 115 95 100 105 110 115 Outdoor ambient temperature Outdoor ambient temperature NTXSST24B112AA NTYSST24B112AA (psig)

  • Page 36: Ntxsst30B112Aa Ntysst30B112Aa

    NTXSST30B112AA NTYSST30B112AA (psig) (psig) (°F) (°F) 95 100 105 110 115 95 100 105 110 115 Outdoor ambient temperature Outdoor ambient temperature NTXSST36B112AA NTYSST36B112AA (psig) (psig) (°F) 95 100 105 110 115 (°F) 95 100 105 110 115 Outdoor ambient temperature Outdoor ambient temperature NTXSST30C112AA (psig)

  • Page 37: Ntxsst36B112Aa

    NTXSST36C112AA (psig) (psig) (°F) (°F) 95 100 105 110 115 95 100 105 110 115 Outdoor ambient temperature Outdoor ambient temperature NTYSST36C112AA (psig) (psig) (°F) (°F) 95 100 105 110 115 95 100 105 110 115 Outdoor ambient temperature Outdoor ambient temperature OBHT875A...

  • Page 38: Ntxsst09B112Aa

    Heating Data are based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data are for heating operation without any frost. NTXSST09B112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature NTXSSH09A112AA (psig) (psig) (°F) (°F)

  • Page 39: Ntxsst12B112Aa

    NTXSST12B112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature NTXSSH12A112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature NTXSST15B112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature NTXSSH15A112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature OBHT875A...

  • Page 40: Ntxsst18B112Aa

    NTXSST18B112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature NTXSSH18A112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature NTXSST24B112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature NTXSSH24A112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature OBHT875A...

  • Page 41: Ntxsst30B112Aa

    NTXSST30B112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature NTXSST36B112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature NTXSST30C112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature NTXSST36C112AA (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature OBHT875A...

  • Page 42: Standard Operation Data

    7-4. STANDARD OPERATION DATA Model NTXWST09B112AA NTXWST09B112AA NTYWST09B112AA Item Unit COOL HEAT COOL HEAT COOL Capacity Btu/h 9,000 10,900 9,000 9,600 9,000 — — — Input 0.585 0.72 0.585 0.58 0.585 Rated frequency 57.5 Indoor unit NTXWST09B112AA NTXWST09B112AA NTYWST09B112AA Power supply V, phase, Hz 208/230, 1, 60 208/230, 1, 60...
  • Page 43 Model NTXWST12B112AA NTXWST12B112AA NTYWST12B112AA Item Unit COOL HEAT COOL HEAT COOL Capacity Btu/h 12,000 14,400 12,000 12,300 12,000 — 0.77 — 0.77 — 0.77 Input 0.92 0.92 0.83 0.92 Rated frequency 47.5 45.5 Indoor unit NTXWST12B112AA NTXWST12B112AA NTYWST12B112AA Power supply V, phase, Hz 208/230, 1, 60 208/230, 1, 60...
  • Page 44 Model NTXWST15B112AA NTXWST15B112AA NTYWST15B112AA Item Unit COOL HEAT COOL HEAT COOL Capacity Btu/h 14,000 18,000 14,000 14,000 14,000 — — — Input 1.14 Rated frequency 57.5 Indoor unit NTXWST15B112AA NTXWST15B112AA NTYWST15B112AA Power supply V, phase, Hz 208/230, 1, 60 208/230, 1, 60 208/230, 1, 60 Input 0.045...
  • Page 45 Model NTXWST18B112AA NTXWST18B112AA NTYWST18B112AA Item Unit COOL HEAT COOL HEAT COOL Capacity Btu/h 18,000 19,000 18,000 19,000 18,000 — 0.77 — 0.77 — 0.77 Input 1.34 1.34 1.34 1.34 1.34 Rated frequency Indoor unit NTXWST18B112AA NTXWST18B112AA NTYWST18B112AA Power supply V, phase, Hz 208/230, 1, 60 208/230, 1, 60 208/230, 1, 60...
  • Page 46 Model NTXWST24B112AA NTXWST24B112AA NTYWST24B112AA Item Unit COOL HEAT COOL HEAT COOL Capacity Btu/h 22,500 27,600 22,500 20,800 22,500 — 0.75 — 0.75 — 0.75 Input 2.34 1.52 Rated frequency 81.5 Indoor unit NTXWST24B112AA NTXWST24B112AA NTYWST24B112AA Power supply V, phase, Hz 208/230, 1, 60 208/230, 1, 60 208/230, 1, 60...
  • Page 47 Model NTXWST30B112AA NTYWST30B112AA NTXWST36B112AA NTYWST36B112AA Item Unit Cooling Heating Cooling Cooling Heating Cooling Capacity Btu/h 30,700 32,600 30,700 32,000/33,200 35,200 32,000/33,200 — 0.72 — 0.72 0.69 — 0.69 Input 3.32 3.34 3.32 3.63/3.77 3.74 3.63/3.77 Rated frequency Indoor unit NTXWST30B112AA NTYWST30B112AA NTXWST36B112AA NTYWST36B112AA...
  • Page 48 Model NTXWST30C112AA NTYWST30C112AA NTXWST36C112AA NTYWST36C112AA Item Unit COOL HEAT COOL COOL HEAT COOL Capacity Btu/h 30,600 32,600 30,600 33,200 35,200 33,200 — 0.72 — 0.72 0.69 — 0.69 Input 3.32 3.34 3.32 3.77 3.74 3.77 Rated frequency Indoor unit NTXWST30C112AA NTYWST30C112AA NTXWST36C112AA NTYWST36C112AA...
  • Page 49 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY NTXSST09B112AA NTYSST09B112AA NTXSST09B112AA Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor NTXSSH09A112AA...
  • Page 50 NTXSST15B112AA NTYSST15B112AA NTXSST15B112AA Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor NTXSSH15A112AA Correction of Cooling capacity...
  • Page 51 NTXSST24B112AA NTYSST24B112AA NTXSST24B112AA Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor NTXSSH24A112AA Correction of Cooling capacity...
  • Page 52 NTXSST30B112AA NTYSST30B112AA NTXSST30B112AA Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor NTXSST36B112AA NTYSST36B112AA (208V) NTXSST36B112AA (208V)
  • Page 53 NTXSST30C112AA NTYSST30C112AA NTXSST30C112AA Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor NTXSST36C112AA NTYSST36C112AA NTXSST36C112AA...

  • Page 54: Actuator Control

    ACTUATOR CONTROL NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA NTXSST18B112AA NTXSSH18A112AA NTYSST18B112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30B112AA NTYSST30B112AA NTXSST30C112AA NTYSST30C112AA NTXSST36B112AA NTYSST36B112AA NTXSST36C112AA NTYSST36C112AA 8-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running.

  • Page 55: Service Functions

    SERVICE FUNCTIONS NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA NTXSST18B112AA NTXSSH18A112AA NTYSST18B112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30B112AA NTYSST30B112AA NTXSST30C112AA NTYSST30C112AA NTXSST36B112AA NTYSST36B112AA NTXSST36C112AA NTYSST36C112AA 9-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board (Refer to 10-6.1.). Defrost finish temperature Jumper NTXSST09/12/15B112AA...

  • Page 56: Troubleshooting

    TROUBLESHOOTING NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA NTXSST18B112AA NTXSSH18A112AA NTYSST18B112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30B112AA NTYSST30B112AA NTXSST30C112AA NTYSST30C112AA NTXSST36B112AA NTYSST36B112AA NTXSST36C112AA NTYSST36C112AA 10-1. CAUTIONS ON TROUBLESHOOTING 1. Before troubleshooting, check the following 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for miswiring.
  • Page 57 10-2. 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 (10-3.) disappears, the memorized failure details can be recalled. 1.
  • Page 58 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. *1.
  • Page 59 NOTE: Blinking patterns of this mode differ from the ones 3. Table of outdoor unit failure mode recall function of TROUBLESHOOTING CHECK TABLE (10-3.). The left lamp of the Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR...
  • Page 60 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). The left lamp of the Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection) (Outdoor P.C. board) mode recall recall function lamp...
  • Page 61 10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink every Outdoor power Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of does not 2.5 seconds system within 1 minute after the compressor gets started. compressor.
  • Page 62 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink Deceleration of the SST/H09/12/15/18 When the input current exceeds approximately The unit is normal, but check the operates. 2.5 seconds OFF operational 10A (SST/H09)/10.5A (SST/H12/15/18), com- following. • Check if indoor filters are frequency of the pressor frequency lowers.
  • Page 63 10-4. TROUBLESHOOTING CRITERION OF MAIN PARTS NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA NTXSST18B112AA NTXSSH18A112AA NTYSST18B112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30B112AA NTYSST30B112AA NTXSST30C112AA NTYSST30C112AA NTXSST36B112AA NTYSST36B112AA NTXSST36C112AA NTYSST36C112AA Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a multimeter. Fin temperature Refer to 10-6.
  • Page 64 Part name Check method and criterion Figure Measure the resistance using a multimeter. [Temperature: 14 - 104°F (-10 - 40°C)] Normal (Ω) Color of lead wire Expansion valve coil RED – ORN (LEV) RED – WHT (+12V) 37 - 54 RED –...

  • Page 65: Troubleshooting Flow

    10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700). Check the voltage between terminals. See 10-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 10-5.
  • Page 66 D Check of compressor winding ●Disconnect the connector between the compressor and the power module (IC700), and measure the resistance between the compressor terminals. <<Measurement point>> At 3 points *Measure the resistance between the lead wires at 3 points. BLK-WHT BLK-RED WHT-RED <<Judgement>>...
  • Page 67 G Check of outdoor thermistors Disconnect the connector of thermistor in the inverter P.C. board (see below table), and measure the resistance of thermistor. Replace the thermistor except RT64. Is the resistance of thermistor normal? When RT64 is abnormal, replace the inverter P.C. (Refer to 10-6.1.) board.
  • Page 68 H Check of R.V. coil NTXSST/H09/12/15/18 * First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4. * In case CN721 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V.
  • Page 69 I Check of outdoor fan motor Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932. Is the resistance between each termi- nal of outdoor fan motor normal? (Refer to 10-4.) Disconnect CN932 from the inverter P.C.
  • Page 70 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Rectify indoor/outdoor Turn ON power supply and press the emergency operation switch. connecting wire. Does the left lamp of the Is there voltage 208/230 V AC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal...
  • Page 71 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> NTXWST24B112AA While pressing both Operation select button and NTYWST24B112AA TEMP / TOO COOL button on the remote controller NTXWST06/09/12/15B112AA NTXWST18B112AA NTXWST30/36C112AA NTXWST30/36B112AA at the same time, press RESET button. NTYWST30/36C112AA NTYWST09/12/15B112AA NTYWST18B112AA...

  • Page 72: Emergency Operation

    L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the inverter P.C. board? Check the connection of the connectors (CN931, CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION.
  • Page 73 M How to check miswiring and serial signal error NTXSST/H06/09/12/15B112AA Turn OFF the power supply. NTYSST09/12/15B112AA Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring.
  • Page 74 NTXSST/H18/24B112AA NTYSST18/24B112AA Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring. Press the emergency operation switch once. Does the OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit>...
  • Page 75 NTXSST30/36B112AA NTYSST30/36B112AA NTXSST30/36C112AA Turn OFF the power supply. NTYSST30/36C112AA 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. Press the emergency operation switch once.
  • Page 76 N Check of defrost heater NTXSSH09A112AA NTXSSH12A112AA NTXSSH15A112AA NTXSSH18A112AA NTXSSH24A112AA Check the following points before checking electric continuity. 1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 10-6.1. 2. Is the resistance of defrost heater normal? Refer to 10-4. 3.
  • Page 77 P 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. (3m), the indoor unit, and/or the antennas and the out- or is the distance between the antennas door unit.
  • Page 78 Q Check of compressor protector NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA NTXSST18B112AA NTXSSH18A112AA NTYSST18B112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30C112AA NTYSST30C112AA NTXSST36C112AA NTYSST36C112AA Disconnect the connector of compressor protector in the inverter P.C. board, and check the conduc- tion of compressor protector. Operate the unit Is the discharge temperature and re-confirm if...
  • Page 79 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board NTXSST09B112AA NTXSSH09A112AA NTYSST09B112AA NTXSST12B112AA NTXSSH12A112AA NTYSST12B112AA NTXSST15B112AA NTXSSH15A112AA NTYSST15B112AA Back side of unit DB61 Smoothing Smoothing Fuse (F801) R.V.coil (CN721) Fuse (F701) 208/230 V AC 260 - 370 V DC capacitor capacitor T3.15AL250V...
  • Page 80 NTXSST18B112AA NTYSST18B112AA Smoothing Smoothing Smoothing R.V.coil Defrost Back side of unit capacitor capacitor capacitor (CN721) heater (C61) (C62) (C63) 230 V AC (CN722) DB61 230 V AC 260 - 370 V DC Fuse (F801) Fuse (F701) T3.15AL250V T3.15AL250V Fuse (F62) 15 A 250V Output to drive compressor...
  • Page 81 NTXSSH18A112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30B112AA NTYSST30B112AA NTXSST36B112AA NTYSST36B112AA Smoothing Smoothing Smoothing Fuse (F880) Output to drive Heater (CN601) Capacitor Capacitor Capacitor T3.15AL250V outdoor fan motor 208/230 V AC Back side of unit (CB3) (CB1) (CB2) (CN932) 208/230 V AC R.V. coil/ Fuse (F62) 21S4 15 A 250 V...
  • Page 82 NTXSST30C112AA NTYSST30C112AA NTXSST36C112AA NTYSST36C112AA Smoothing Smoothing Smoothing Output to drive Capacitor Capacitor Capacitor Fuse (F880) outdoor fan motor Heater (CN601) Back side of unit (CB1) (CB2) (CB3) T3.15AL250V (CN932) 230 V AC Fuse (F601) T3.15AL250V 208/230 V AC Fuse (F62) 15 A 250 V R.V.
  • Page 83 2. Fuse P.C. board NTXSSH18A112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NTXSST30C112AA NTYSST30C112AA NTXSST36C112AA NTYSST36C112AA FUSE (F66) FUSE (F65) T6.3AL250V T6.3AL250V OBHT875A...

  • Page 84: 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 85 OPERATING PROCEDURE PHOTOS/FIGURES Screws of the Screw of the Photo 4 Photo 5 conduit cover conduit plate 2. Removing the inverter assembly, inverter P.C. board Photo 6 (1) Remove the top panel, cabinet and service panel. (Refer to section 1.) Screw of the heat sink (2) Disconnect the lead wire to the reactor and the following support and the separator...
  • Page 86 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, Photo 8 defrost thermistor, outdoor heat exchanger tempera- ture thermistor and ambient temperature thermistor Screw of the (1) Remove the top panel, cabinet and service panel. (Refer to R.V. coil (NTX) section 1.) (2) Disconnect the lead wire to the reactor and the following connectors:...

  • Page 87: Removing Outdoor Fan Motor

    OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 10 (1) Remove the top panel, cabinet and service panel. (Refer to Screws of the outdoor fan motor section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller fan nut.
  • Page 88 11-2. NTXSST18B112AA NTXSSH18A112AA NTYSST18B112AA NTXSST24B112AA NTXSSH24A112AA NTYSST24B112AA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 Screws of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
  • Page 89 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 5 board (NTXSST18B112AA, NTYSST18B112AA) (1) Remove the top panel, cabinet and service panel. (Refer to Screw of the heat sink section 1.) support and the separator (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
  • Page 90 OPERATING PROCEDURE PHOTOS/FIGURES * Connection procedure when attaching the inverter P.C. Photo 7 board (Photo 8) 1. Attach the heat sink support to the P.C. board support. 2. Connect the lead wires of the expansion valve coil to the connector on the inverter P.C. board. Pull the lead wires of the expansion valve coil toward you and put them on the left hook on the P.C.
  • Page 91 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the inverter assembly, inverter P.C. board Photo 9 and fuse P.C. board (Other models) Screw of the heat Screw of the P.C. board 3-1. Removing the inverter assembly and inverter P.C. board sink support and the support and the motor (1) Remove the top panel, cabinet and service panel.
  • Page 92 OPERATING PROCEDURE PHOTOS/FIGURES * Connection procedure when attaching the inverter P.C. Photo 11 board (Photo 12, 13) 1. Attach the heat sink support to the P.C. board support. 2. Hook the lead wires of the compressor, the reactor and the P.C.
  • Page 93 OPERATING PROCEDURE PHOTOS/FIGURES 3-2. Removing the fuse P.C. board Photo 14 (1) Remove the top panel, cabinet and service panel. (Refer to Support section 1.) CN65 Fuse P.C. board (2) Disconnect the lead wire to the reactor and the inverter P.C. board connectors.
  • Page 94 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, Photo 16 defrost thermistor, outdoor heat exchanger tempera- NTXSSH•A112AA ture thermistor and ambient temperature thermistor Outdoor heat exchanger (1) Remove the cabinet and panels. (Refer to section 1.) temperature thermistor (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
  • Page 95 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the compressor and 4-way valve Photo 18 (1) Remove the cabinet and panels. (Refer to section 1.) Brazed part of (2) Remove the inverter assembly. (Refer to section 2 the discharge pipe (NTXSST18B112AA, NTYSST18B112AA), section 3-1 Discharge (Other models).) temperature...
  • Page 96 11-3. NTXSST30B112AA NTYSST30B112AA NTXSST36B112AA NTYSST36B112AA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 Screws of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
  • Page 97 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 5 board (1) Remove the top panel, cabinet and service panel. (Refer to Screw of the P.C. board section 1.) Screw of the heat sink support and the motor (2) Disconnect the lead wire to the reactor and the following support and the separator support...
  • Page 98 OPERATING PROCEDURE PHOTOS/FIGURES * Connection procedure when attaching the inverter P.C. Photo 7 board (Photo 8, 9) 1. Attach the heat sink support to the P.C. board support. 2. Hook the lead wires of the compressor, the reactor and the P.C.
  • Page 99 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the discharge temperature thermistor, Photo 10 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat exchanger ture thermistor and ambient temperature thermistor temperature thermistor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
  • Page 100 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the compressor and 4-way valve Photo 12 (1) Remove the cabinet and panels. (Refer to section 1.) Brazed part of Brazed part of (2) Remove the inverter assembly. (Refer to section 2.) the discharge pipe the suction pipe (3) Remove the screws fixing the reactor.
  • Page 101 11-4. NTXSST30C112AA NTYSST30C112AA NTXSST36C112AA NTYSST36C112AA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 Screws of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
  • Page 102 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 5 and fuse P.C. board (Other models) 2-1. Removing the inverter assembly and inverter P.C. board Screw of the heat Screw of the P.C. board sink support and the (1) Remove the top panel, cabinet and service panel.
  • Page 103 OPERATING PROCEDURE PHOTOS/FIGURES * Connection procedure when attaching the inverter P.C. Photo 7 board (Photo 8, 9) 1. Attach the heat sink support to the P.C. board support. 2. Hook the lead wires of the compressor, the reactor and the P.C.
  • Page 104 OPERATING PROCEDURE PHOTOS/FIGURES 2-2. Removing the fuse P.C. board Photo 10 (1) Remove the top panel, cabinet and service panel. (Refer to Support section 1.) CN65 Fuse P.C. board (2) Disconnect the lead wire to the reactor and the inverter P.C. board connectors.
  • Page 105 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the discharge temperature thermistor, Photo 12 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat exchanger ture thermistor and ambient temperature thermistor temperature thermistor (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
  • Page 106 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the compressor and 4-way valve Photo 14 (1) Remove the cabinet and panels. (Refer to section 1.) Brazed part of (2) Remove the inverter assembly. (Refer to section 2.) the discharge pipe (3) Remove the screws fixing the reactor. Discharge (4) Remove the reactor.
  • Page 107 OBHT875A...
  • Page 108 MITSUBISHI ELECTRIC TRANE HVAC US LLC HEAD OFFICE: 1340 SATELLITE BOULEVARD, SUWANEE, GA 30024, USA © Copyright 2021 MITSUBISHI ELECTRIC CORPORATION Issued: Oct. 2022. No. OBHT875 REVISED EDITION-A Published: Feb. 2021. No. OBHT875 Made in Japan Specifications are subject to change without notice.

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