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SERVICE MANUAL
R410A
Outdoor unit
[Model Name]
NAXSKS09A112AA
NAXSKS12A112AA
NAXSKS15A112AA
NAXSKS09A112AA
Air inlet
(back and side)
Piping
Air outlet
Drain hose
Drain outlet
No. OCHA699
REVISED EDITION-A
Revision:
Some descriptions have
been modified in REVISED
EDITION-A
OCHA699 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 (OCBA699)
June 2021
HFC
utilized
R410A
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric American Standard NAXSKS09A112AA
Summary of Contents for Mitsubishi Electric American Standard NAXSKS09A112AA
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Page 1: Table Of Contents
June 2021 No. OCHA699 REVISED EDITION-A utilized SERVICE MANUAL R410A R410A Outdoor unit Revision: [Model Name] Some descriptions have NAXSKS09A112AA been modified in REVISED EDITION-A OCHA699 is void. NAXSKS12A112AA Note: This service manual describes service data of the outdoor units only. -
Page 2: Combination Of Indoor And Outdoor Units
COMBINATION OF INDOOR AND OUTDOOR UNITS Outdoor unit Indoor unit Heat pump type Service NAXSKS15 NAXSKS09 NAXSKS12 Service Ref. A112AA Manual No. A112AA A112AA OCHA669 NAXCKS09/12/15A112AA — NAXDKS09/12/15A112AA PEAD-A09/12/15AA7.MX HWE1608A NAXAMT12A112AA — — — NAXUKS09/12A112AA OBHA802 — PART NAMES AND FUNCTIONS NAXSKS09A112AA NAXSKS12A112AA NAXSKS15A112AA... -
Page 3: Specification
SPECIFICATION Outdoor unit model NAXSKS09A112AA NAXSKS12A112AA NAXSKS15A112AA 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) 11.8(0.35)/(FV50S) 11.8(0.35)/(FV50S) -
Page 4: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: inch(mm) NAXSKS09A112AA NAXSKS12A112AA NAXSKS15A112AA REQUIRED SPACE 4 in. (100 mm) or more when front and sides of the unit are clear (NAXSKS09/12/15A112AA) When any 2 sides of left, right and rear of the unit are clear holes Liquid refrigerant pipe joint Refrigerant pipe (flared) -
Page 5: Wiring Diagram
WIRING DIAGRAM NAXSKS09A112AA NAXSKS12A112AA OCHA699A... - Page 6 NAXSKS15A112AA OCHA699A...
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Page 7: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM NAXSKS09A112AA NAXSKS12A112AA NAXSKS15A112AA Unit: Inch (mm) Refrigerant pipe ø3/8 (ø9.52) (NAXSKS09/12A112AA) ø1/2 (ø12.7) (NAXSKS15A112AA) 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler Discharge heat RT68 Flared connection exchanger temperature Service... -
Page 8: Data
DATA STANDARD OPERATION DATA NAXDKS09A112AA NAXDKS12A112AA NAXDKS15A112AA Representative matching Item Unit Cooling Heating Cooling Heating Cooling Heating Capacity BTU/h 9000 12000 12000 15000 15000 18000 0.82 — 0.82 — 0.86 — Input 0.93 1.33 1.15 1.44 NAXDKS09A112AA NAXDKS12A112AA NAXDKS15A112AA Indoor unit Power supply (V, phase, Hz) 230, 1, 60 Input... - Page 9 Representative matching PEAD-A09AA7 PEAD-A12AA7 PEAD-A15AA7 Item Unit Cooling Heating Cooling Heating Cooling Heating Capacity BTU/h 9000 12000 12000 15000 15000 18000 — — — Input 0.72 0.93 1.16 1.15 1.35 Indoor unit PEAD-A09AA7 PEAD-A12AA7 PEAD-A15AA7 Power supply (V, phase, Hz) 230, 1, 60 Input 0.07...
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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 NAXSKS09/12/15A112AA Soldered 41°F (5°C) - Page 12 10-2. TROUBLE SHOOTING CHECK TABLE NAXSKS09A112AA NAXSKS12A112AA NAXSKS15A112AA check Symptoms Condition Remedy Abnormal point/ Condition check indication code No. Symptoms Condition Remedy Abnormal point/ Condition code indication Overcurrent protection cut-out operates 3 consecutive times Outdoor unit 1-time flash Outdoor power sys- •...
- 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 NAXSKS09A112AA NAXSKS12A112AA NAXSKS15A112AA 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 NAXSKS09/12/15A112AA 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 NAXSKS09A112AA NAXSKS12A112AA NAXSKS15A112AA 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 T3.15AL250V Fuse (F901)
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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
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 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 OCHA699A...
- Page 34 MITSUBISHI ELECTRIC TRANE HVAC US LLC HEAD OFFICE: 1340 SATELLITE BOULEVARD, SUWANEE, GA 30024 USA ©Copyright 2018 MITSUBISHI ELECTRIC CORPORATION Issued: Jun. 2021 No. OCHA699 REVISED EDITION-A Published: Dec. 2018. No. OCHA699 Specifications are subject to change without notice. Made in Japan...
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