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SERVICE MANUAL
Outdoor unit
[Model Name]
NTXSKS18A112AA
NTXSKS24A112AA
NTXSKS30A112AA
NTXSKS36A112AA
R410A
CONTENTS
AND 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 ························································· 9
8. ACTUATOR CONTROL ·························· 12
9. SERVICE FUNCTIONS ··························· 13
10. TROUBLESHOOTING ···························· 13
11. FUNCTION SETTING ····························· 30
12. DISASSEMBLY INSTRUCTIONS ··········· 33
PARTS CATALOG (OCBT688)
March 2022
No. OCHT688
REVISED EDITION-E
Revision:
• Connectable indoor units
have been added in
REVISED EDITION-E.
OCHT688D is void.
Note:
• This manual describes service
data of the outdoor units only.
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Troubleshooting
Related Manuals for Mitsubishi Electric NTXSKS18A112AA
Summary of Contents for Mitsubishi Electric NTXSKS18A112AA
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Page 1: Table Of Contents
No. OCHT688 SERVICE MANUAL R410A REVISED EDITION-E Outdoor unit [Model Name] Revision: • Connectable indoor units have been added in NTXSKS18A112AA REVISED EDITION-E. OCHT688D is void. Note: NTXSKS24A112AA • This manual describes service data of the outdoor units only. NTXSKS30A112AA NTXSKS36A112AA CONTENTS 1. -
Page 2: Combination Of Indoor
— NAXAMT30A112AA — — — ○ NAXAMT36A112AA — — — ○ OBHT802 NTXUKS18A112AA — — — OBBT802 PART NAMES AND FUNCTIONS NTXSKS18A112AA NTXSKS24A112AA NTXSKS30A112AA NTXSKS36A112AA OUTDOOR UNIT Air inlet (back and side) Piping Drain hose Air outlet Drain outlet OCHT688E... -
Page 3: Specification
SPECIFICATION NTXSKS NTXSKS NTXSKS NTXSKS Outdoor unit model 18A112AA 24A112AA 30A112AA 36A112AA Power supply V , phase , Hz 208/230 , 1 , 60 Max. fuse size (time delay) Min. circuit ampacity Fan motor F.L.A 0.67 1.00 Model SNB130FQBMT SNB220FQGM1T R.L.A 10.0 13.0... -
Page 4: Outlines And Dimensions
OUTLINES AND DIMENSIONS NTXSKS18A112AA NTXSKS24A112AA NTXSKS30A112AA NTXSKS36A112AA Unit: inch REQUIRED SPACE *1 20 in. (500 mm) or more when front and sides of the unit are clear 16-7/16 Air in 1-9/16 Air in Air out 2-holes 13/32 13/16 6-7/8 19-11/16... -
Page 5: Wiring Diagram
WIRING DIAGRAM NTXSKS18A112AA OCHT688E... - Page 6 NTXSKS24A112AA NTXSKS30A112AA NTXSKS36A112AA OCHT688E...
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Page 7: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM NTXSKS18A112AA Unit: inch (mm) Muffler 4-way Refrigerant pipe ø1/2 ( ø 12.7) valve (with heat insulator) Service port Stop valve (with service port) Strainer Outdoor #100 Flared connection Discharge heat Defrost temperature exchanger Service thermistor thermistor port... -
Page 8: Additional Refrigerant Charge (R410A: Oz.)
MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Piping size O.D: in. Model Max. Length Max. Height difference Liquid NTXSKS18A112AA NTXSKS 24/30/36A112AA Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. -
Page 9: Data
0.04 0.11 0.09 0.12 Current 0.74 0.63 0.43 0.38 0.95 0.84 1.03 0.92 Outdoor unit NTXSKS18A112AA NTXSKS18A112AA NTXSKS18A112AA NTXSKS24A112AA Power supply (V, phase, Hz) 230, 1, 60 230, 1, 60 230, 1, 60 Input 1.22 1.51 1.37 1.81 1.16 1.51 1.89... - Page 10 230, 1, 60 Input 0.17 0.15 0.25 0.23 0.16 0.18 Current 1.31 1.71 1.44 Outdoor unit NTXSKS30A112AA NTXSKS36A112AA NTXSKS18A112AA NTXSKS24A112AA Power supply (V, phase, Hz) 230, 1, 60 230, 1, 60 Input 1.99 2.26 3.26 2.94 1.44 1.74 1.73 Current 8.08 9.28...
- Page 11 Power supply (V, phase, Hz) 230, 1, 60 230, 1, 60 Input 0.21 0.34 0.04 Current Outdoor unit NTXSKS30A112AA NTXSKS36A112AA NTXSKS18A112AA Power supply (V, phase, Hz) 230, 1, 60 230, 1, 60 Input 1.95 1.85 3.38 2.69 1.73 Current 7.39 6.96...
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Page 12: 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 13: Service Functions
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 NTXSKS18A112AA NTXSKS24/30/36A112AA Soldered 48°F (9°C) 50°F (10°C) - Page 14 10-2. TROUBLE SHOOTING CHECK TABLE check No. Symptoms Condition Remedy code Abnormal point/ Condition indication Outdoor power system Overcurrent protection cut-out operates 3 consecutive times within 1 • Reconnect connector of compressor. minute after the compressor gets started. • Refer to “10-5. How to check check Symptoms...
- Page 15 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 16 10-3-2. Remote controller check <PAR-3xMAA ("x" represents 0 or later)> If operations cannot be completed with the remote controller, diagnose the remote controller with this function. Select "Service" from the Main menu, and press the button. Maintenance password Remote controller check Select "Remote controller check"...
- Page 17 10-3-3. 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 18 • 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.
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Page 19: Trouble Criterion Of Main Parts
10-4. TROUBLE CRITERION OF MAIN PARTS NTXSKS18A112AA NTXSKS24A112AA NTXSKS30A112AA NTXSKS36A112AA Part name Check method and criterion Figure Defrost thermistor Measure the resistance with a tester. (RT61) Refer to “Inverter P.C. board” in "10-6. TEST POINT DIAGRAM AND Fin temperature VOLTAGE”, for the chart of thermistor. -
Page 20: 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”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. - Page 21 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 22 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 23 I Check of outdoor fan motor 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. TROUBLE CRITERION OF MAIN PARTS".) Disconnect CN932 from the inverter P.C. board, and turn on the power supply.
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Page 24: Emergency Operation
K Check of LEV Start Turn on power supply to the outdoor unit after checking Normal LEV coil is fixed to the LEV body securely. Is "click - click" sound heard? Or, do you feel vibration of the LEV coil with a hand? Disconnect the connector CN724 is there nor- Replace the inverter P.C. - Page 25 Turn OFF the power supply. Remove the bridge between outdoor terminal block S2 and S3. NTXSKS18A112AA NTXSKS24/30/36A112AA Turn on the power supply. Replace the indoor electronic control P.C. board. Is there amplitude of 10 to 20 VDC between the indoor terminal block S2 and S3? <Confirmation of serial signal>...
- Page 26 NOTE: In case both thermistors are more than the above temperature, cool them with cold water etc... Is there 208/230 VAC between CN722 (NTXSKS18A112AA)/CN601 (Other Not the problem of the inverter P.C. board. models) on the inverter P.C. board? Refer to 10-6.1.
- Page 27 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 28 10-6. TEST POINT DIAGRAM AND VOLTAGE Inverter P.C. board NTXSKS18A112AA R.V.coil Smoothing Smoothing (CN721) Defrost heater Smoothing DB61 capacitor Back side of unit capacitor 208/230 V AC (CN722) capacitor (C61) 260 - 370 V DC (C62) (C63) 208/230 V AC...
- Page 29 NTXSKS24A112AA NTXSKS30A112AA NTXSKS36A112AA Jumper wire for pre-heat control setting (JK) LEV (CN724) Jumper wire for changing defrost setting (JS) Ambient temperature thermistor/RT65 (CN672) Heater (CN601) Outdoor heat exchanger 208/230 V AC temperature thermistor R.V. coil (CN602) /RT68 (CN671) 208/230 V AC Discharge temperature thermistor/RT62 (CN671)
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Page 30: 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 31 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 32 <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 33: Disassembly Instructions
Locking lever lever. Connector NTXSKS18A112AA NTXSKS24A112AA NTXSKS30A112AA NTXSKS36A112AA : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE... - Page 34 Screws of nectors: the earth wire <Inverter P.C. board> CN721 (R.V. coil) CN722 (Defrost heater) (NTXSKS18A112AA) CN931, CN932 (Fan motor) CN601(Defrost heater) (NTXSKS24/30/36A112AA) CN641 (Defrost thermistor and discharge temperature ther- mistor) CN643 (Ambient temperature thermistor) CN644 (Outdoor heat exchanger temperature thermistor) CN724 (LEV) (3) Remove the compressor connector.
- Page 35 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the discharge temperature thermistor, Photo 8 Outdoor heat exchanger tempera- defrost thermistor, outdoor heat exchanger tempera- Ambient tem- ture thermistor perature ture thermistor and ambient temperature thermistor thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
- Page 36 MITSUBISHI ELECTRIC TRANE HVAC US LLC HEAD OFFICE: 1340 SATELLITE BOULEVARD, SUWANEE, GA 30024 USA © Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Mar. 2022 No. OCHT688 REVISED EDITION-E Issued: Jun. 2021 No. OCHT688 REVISED EDITION-D Issued: Aug. 2020 No. OCHT688 REVISED EDITION-C Issued: Feb.
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