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SERVICE MANUAL
R410A
Outdoor unit
[Model Name]
NTXSKS09A112AA
NTXSKS12A112AA
NTXSKS15A112AA
NTXSKS09A112AA
Air inlet
(back and side)
Piping
Air outlet
Drain hose
Drain outlet
REVISED EDITION-B
Revision:
Connectable indoor units
have been added in
REVISED EDITION-B
OCHT699A is void.
Note:
This service manual describes
service data of the outdoor units
only.
CONTENTS
OUTDOOR UNITS ······························ 2
2. PART NAMES AND FUNCTIONS ·········· 2
3. SPECIFICATION ································ 3
4. OUTLINES AND DIMENSIONS ············· 4
5. WIRING DIAGRAM ····························· 5
6. REFRIGERANT SYSTEM DIAGRAM ····· 7
7. DATA ················································ 8
8. ACTUATOR CONTROL ····················· 10
9. SERVICE FUNCTION ························ 11
10. TROUBLESHOOTING ······················· 11
11. FUNCTION SETTING ························ 27
12. DISASSEMBLY INSTRUCTIONS ········· 30
PARTS CATALOG (OCBT699)
HFC
utilized
R410A
March 2022
No. OCHT699
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Table of Contents
Troubleshooting
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Summary of Contents for Mitsubishi Electric NTXSKS09A112AA
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Page 1: Table Of Contents
March 2022 No. OCHT699 REVISED EDITION-B SERVICE MANUAL R410A Outdoor unit Revision: [Model Name] Connectable indoor units NTXSKS09A112AA have been added in REVISED EDITION-B OCHT699A is void. NTXSKS12A112AA Note: This service manual describes service data of the outdoor units only. -
Page 2: Combination Of Indoor And Outdoor Units
○ ○ HWE19030 TPEADA009/012/0151AA70A BWE019190 ○ NTXAMT12A112AA — — — ○ NAXAMT12A112AA — — — ○ ○ NTXUKS09/12A112AA OBHT802 — PART NAMES AND FUNCTIONS NTXSKS09A112AA NTXSKS12A112AA NTXSKS15A112AA Air inlet (back and side) Piping Air outlet Drain hose Drain outlet OCHT699B... -
Page 3: Specification
SPECIFICATION Outdoor unit model NTXSKS09A112AA NTXSKS12A112AA NTXSKS15A112AA Power supply V , phase , Hz 208/230 , 1 , 60 Max. fuse size (time delay) Min. circuit ampacity Fan motor F.L.A 0.50 Model KNB073FRVMC SNB092FQAMT SNB130FQBMT R.L.A Compressor L.R.A Refrigeration oil oz(L)/ 9.1(0.27)/(FV50S) -
Page 4: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: inch(mm) NTXSKS09A112AA NTXSKS12A112AA NTXSKS15A112AA REQUIRED SPACE 4 in. (100 mm) or more when front and sides of the unit are clear (NTXSKS09/12/15A112AA) When any 2 sides of left, right and rear of the unit are clear... -
Page 5: Wiring Diagram
WIRING DIAGRAM NTXSKS09A112AA NTXSKS12A112AA OCHT699B... - Page 6 NTXSKS15A112AA OCHT699B...
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Page 7: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM NTXSKS09A112AA NTXSKS12A112AA NTXSKS15A112AA Unit: Inch (mm) Refrigerant pipe ø3/8 (ø9.52) (NTXSKS09/12A112AA) ø1/2 (ø12.7) (NTXSKS15A112AA) 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler Discharge heat RT68 Flared connection... -
Page 8: Data
230, 1, 60 Input 0.06 0.04 0.07 0.05 0.09 0.07 Current 0.39 0.57 0.46 0.74 0.63 Outdoor unit NTXSKS09A112AA NTXSKS12A112AA NTXSKS15A112AA Power supply (V, phase, Hz) 230, 1, 60 Input 0.64 1.06 0.86 1.28 1.06 1.37 Current 2.89 4.64 3.47 5.29... - Page 9 230, 1, 60 Input 0.07 0.05 0.09 0.07 0.11 0.09 Current 0.54 0.43 0.67 0.56 0.95 0.84 Outdoor unit NTXSKS09A112AA NTXSKS12A112AA NTXSKS15A112AA Power supply (V, phase, Hz) 230, 1, 60 Input 0.65 0.85 0.84 1.09 1.04 1.26 Current 2.55 3.48 3.36 4.45...
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Page 10: Actuator Control
ACTUATOR CONTROL 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. 5 seconds 15 seconds Compressor... -
Page 11: Service Function
SERVICE FUNCTION 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. TEST POINT DIAGRAM AND VOLTAGE".) Defrost finish temperature Jumper NTXSKS09/12/15A112AA Soldered 41°F (5°C) - Page 12 10-2. TROUBLE SHOOTING CHECK TABLE NTXSKS09A112AA NTXSKS12A112AA NTXSKS15A112AA check check Symptoms Condition Remedy No. Symptoms Abnormal point/ Condition Condition Remedy Abnormal point/ Condition indication code code indication Outdoor unit 1-time flash Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times •...
- Page 13 10-3. HOW TO PROCEED "SELF-DIAGNOSIS" As this air conditioner has a function to memorize all the failures that had occurred, the latest failure detail can be recalled by following the procedure below. Use this function when the check code is not displayed with wired remote controller or the re- mote controller at use is wireless type.
- Page 14 10-3-2. Self-diagnosis <Wireless remote controller> <In case of trouble during operation> When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> [Procedure] 1.
- Page 15 • Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds Beep Beep Beep Beep Beep Beep Beep OPERATION · · · Repeated INDICATOR lamp blink pattern Approx. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.
- Page 16 10-4. TROUBLE CRITERION OF MAIN PARTS NTXSKS09A112AA NTXSKS12A112AA NTXSKS15A112AA Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a tester. Fin temperature Refer to “Inverter P.C. board” in "10-6. TEST POINT DIAGRAM AND thermistor (RT64) VOLTAGE”, for the chart of thermistor.
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Page 17: Troubleshooting Flow
10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). Check the voltage between terminals. See 10-5. “Check of open phase”. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor. - Page 18 D Check of compressor winding ● Disconnect the connector between the compressor and intelligent power module, and measure the resistance between the compressor terminals. <Measurement point> Measure the resistance between the lead wires at 3 points. BK - WH BK - RD WH - RD <Judgement>...
- Page 19 G Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor. Is the resistance of thermistor normal? Replace the thermistor except RT64. When RT64 is (Refer to "10-6.TEST POINT DIAGRAM AND VOLTAGE".) abnormal, replace the inverter P.C.
- Page 20 I Check of outdoor fan motor Check the connection between the connector CN931 and CN932. Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Is the resistance between each ter- minal of outdoor fan motor normal? (Refer to 10-4.) Disconnect CN932 from the inverter P.C.
- Page 21 J Check of power supply Disconnect the connector between compressor and intelligent power module. Turn ON power supply and press Rectify indoor/outdoor the TEST button twice on the indoor connecting wire. unit or remote controller. Is there voltage 208/230 VAC Replace the indoor Does the POWER lamp on remote between the indoor terminal...
- Page 22 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to "10-5. . Check of outdoor fan motor".) 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.
- Page 23 M How to check miswiring and serial signal error 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 the outdoor terminal block S1 and S2? Check the wiring.
- Page 24 N Check the defrost heater NTXSKS09/12/15A112AA 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. Is the heater protector closed? 4.
- Page 25 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., or is the indoor unit, and/or the antennas and the the distance between the antennas and outdoor unit.
- Page 26 10-6. TEST POINT DIAGRAM AND VOLTAGE Inverter P.C. board NTXSKS09A112AA NTXSKS12A112AA NTXSKS15A112AA Smoothing R.V.coil capacitor (C63) (CN721) Smoothing Smoothing DB61 Back side of unit 208/230 VAC capacitor (C62) capacitor (C61) 260 - 370 VDC Fuse (F701) Fuse (F801) 208/230 VAC T3.15AL250V...
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Page 27: Function Setting
FUNCTION SETTING 11-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER Each function can be set according to necessity using the remote controller. The setting of function for each unit can only be done by the remote controller. Select function available from the table 1. <Table 1>... - Page 28 11-1-1. Selecting functions using the wired remote controller <PAR-3xMAA ("x" represents 0 or later)> <Service menu> Maintenance password is required Select "Service" from the Main menu, and press the button. Main Main menu Maintenance Initial setting *At the main display, the menu button and select "Service" to make the Service maintenance setting.
- Page 29 <Function setting> Select "Service" from the Main menu, and press the button. Test run Input maintenance info. Function setting Check Self check Select "Function setting" with the F1 or F2 button, and press the button. Function setting Set the indoor unit refrigerant addresses and unit numbers with the F1 Ref.
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Page 30: Disassembly Instructions
Locking lever lever. Connector 12-1. NTXSKS09A112AA NTXSKS12A112AA NTXSKS15A112AA : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. NOTE: Turn OFF the power supply before disassembly. - Page 31 OPERATING PROCEDURE PHOTOS/FIGURES Photo 4 Photo 5 Screws of the Screw of the conduit cover conduit plate 2. Removing the inverter assembly, inverter P.C. board Photo 6 (1) Remove the cabinet and panels. (Refer to 1.) Screws of the heat sink (2) Disconnect the lead wire to the reactor and the following support and the separator connectors:...
- Page 32 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, Photo 8 Screw of the defrost thermistor, outdoor heat exchanger tempera- R.V. coil ture thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following con- nectors: <Inverter P.C.
- Page 33 OCHT699B...
- Page 34 MITSUBISHI ELECTRIC TRANE HVAC US LLC HEAD OFFICE: 1340 SATELLITE BOULEVARD, SUWANEE, GA 30024 USA © Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Mar. 2022 No. OCHT699 REVISED EDITION-B Issued: Jun. 2021 No. OCHT699 REVISED EDITION-A Published: Dec. 2018. No. OCHT699 Specifications are subject to change without notice.
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