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SERVICE MANUAL
Outdoor unit
[Model Name]
NAXSKS18A112AA
NAXSKS24A112AA
NAXSKS30A112AA
NAXSKS36A112AA
NAXSKS18A112AA
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 (OCBA688)
June 2021
No. OCHA688
REVISED EDITION-D
Revision:
• Some descriptions have
been modified in REVISED
EDITION-D.
OCHA688C is void.
Note:
• This manual describes service
data of the outdoor units only.
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric American Standard NAXSKS18A112AA
Summary of Contents for Mitsubishi Electric American Standard NAXSKS18A112AA
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Page 1: Table Of Contents
June 2021 No. OCHA688 SERVICE MANUAL R410A REVISED EDITION-D Outdoor unit [Model Name] Revision: • Some descriptions have NAXSKS18A112AA been modified in REVISED EDITION-D. OCHA688C is void. NAXSKS24A112AA Note: • This manual describes service data of the outdoor units only. NAXSKS30A112AA NAXSKS36A112AA CONTENTS... -
Page 2: Combination Of Indoor
COMBINATION OF INDOOR AND OUTDOOR UNITS Outdoor unit Indoor unit Heat pump type Service NAXSKS NAXSKS NAXSKS NAXSKS Model Name Manual No. 18A112AA 24A112AA 30A112AA 36A112AA ○ NAXDKS18A112AA — — — — ○ OCHA669 NAXCKS18A112AA — — — OCBA669 ○ APEADA0181AA70A —... -
Page 3: Specification
SPECIFICATION NAXSKS NAXSKS NAXSKS NAXSKS 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 NAXSKS18A112AA NAXSKS24A112AA NAXSKS30A112AA NAXSKS36A112AA 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 19-11/16 6-7/8 *2 When any 2 sides of left, right and rear of the unit are clear 3-3/16... -
Page 5: Wiring Diagram
WIRING DIAGRAM NAXSKS18A112AA OCHA688D... - Page 6 NAXSKS24A112AA NAXSKS30A112AA NAXSKS36A112AA OCHA688D...
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Page 7: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM NAXSKS18A112AA 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 RT62 RT61 Compressor... -
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 NAXSKS18A112AA NAXSKS 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. Refrigerant piping length (one way): ft. -
Page 9: Data
DATA STANDARD OPERATION DATA APEADA APEADA NAXDKS NAXCKS Representative matching 0181AA70A 0241AA70A 18A112AA 18A112AA Item Unit Cooling Heating Cooling Heating Cooling Heating Cooling Heating Capacity Btu/h 18000 21600 17700 19700 18000 21600 24000 25000 – 0.82 – 0.71 – 0.80 –... - Page 10 APEADA APEADA NAXAMT NAXAMT Representative matching 0301AA70A 0361AA70A 18A112AA 24A112AA Item Unit Cooling Heating Cooling Heating Cooling Heating Cooling Heating Capacity Btu/h 27000 30000 33000 33400 18000 21600 24000 25000 – 0.84 – 0.84 – 0.85 – 0.81 – Input 2.16 2.41 3.51...
- Page 11 Representative matching NAXAMT30A112AA NAXAMT36A112AA NAXUKS18A112AA Item Unit Cooling Heating Cooling Heating Cooling Heating Capacity Btu/h 27000 30000 33400 33400 18000 20000 – – 0.84 – 0.67 – Input 2.16 2.06 3.71 3.03 1.44 1.77 Indoor unit NAXAMT30A112AA NAXAMT36A112AA NAXUKS18A112AA Power supply (V, phase, Hz) 230, 1, 60 230, 1, 60 Input...
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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
SERVICE FUNCTIONS 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 NAXSKS18A112AA NAXSKS24/30/36A112AA Soldered... - 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.A How to check check Symptoms Condition...
- 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 NAXSKS18A112AA NAXSKS24A112AA NAXSKS30A112AA NAXSKS36A112AA 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. thermistor (RT64) Ambient temperature thermistor (RT65) -
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 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 outdoor terminal block S1 and S2? Check the wiring.
- Page 26 N Check the defrost heater (base pan heater) NAXSKS18/24/30/36A112AA 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 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 NAXSKS18A112AA 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 Fuse (F801) Fuse (F901) Fuse (F701)
- Page 29 NAXSKS24A112AA NAXSKS30A112AA NAXSKS36A112AA 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
DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types (refer to (1) and (2)) 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 34 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 5 Screws of the terminal block (1) Remove the cabinet and panels. (Refer to 1.) Screw of the heat sink support and the back panel (2) Disconnect the lead wire to the reactor and the following con- support and the separator Screws of nectors:...
- 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: Jun. 2021 No. OCHA688 REVISED EDITION-D Issued: Aug. 2020 No. OCHA688 REVISED EDITION-C Issued: Feb. 2020 No. OCHA688 REVISED EDITION-B Issued: May 2019 No.
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