Mitsubishi Electric SUZ-KA09NA Service Manual
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Mitsubishi Electric SUZ-KA09NA Service Manual

Mitsubishi electric split-type, heat pump air conditioners service manual
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See also: Installation Manual
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SERVICE MANUAL

R410A
Outdoor unit
[Model names]
SUZ-KA09NA
SUZ-KA12NA
SUZ-KA15NA
SUZ-KA18NA
SUZ-KA18NA.TH
NOTE:
This service manual describes service data of
the outdoor units.
• RoHS compliant products have <G> mark on
the spec name plate.
[Service Ref.]
SUZ-KA09NA.TH
SUZ-KA12NA.TH
SUZ-KA15NA.TH
SUZ-KA18NA.TH
CONTENTS
2. PART NAMES AND FUNCTIONS ...................... 2
3. SPECIFICATION ................................................. 3
4. OUTLINES AND DIMENSIONS .......................... 4
5. WIRING DIAGRAM ............................................ 5
7. DATA ................................................................. 11
8. ACTUATOR CONTROL .................................... 12
9. SERVICE FUNCTION... .................................... 13
10. TROUBLESHOOTING ...................................... 13
11. FUNCTION SETTING ....................................... 29
12. DISASSEMBLY INSTRUCTIONS ..................... 32
PARTS CATALOG (OCB467)
January 2010
No.OCH467
HFC
utilized
R410A

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Summary of Contents for Mitsubishi Electric SUZ-KA09NA

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS January 2010 No.OCH467 utilized R410A SERVICE MANUAL R410A Outdoor unit [Model names] [Service Ref.] SUZ-KA09NA.TH SUZ-KA09NA SUZ-KA12NA.TH SUZ-KA12NA SUZ-KA15NA.TH SUZ-KA15NA SUZ-KA18NA.TH SUZ-KA18NA CONTENTS 1. COMBINATION OF INDOOR AND OUTDOOR UNITS ..2 2. PART NAMES AND FUNCTIONS ...... 2 3.

  • Page 2: Combination Of Indoor And Outdoor Units

    — — SEZ-KD12NA.TH HWE08020 — — SEZ-KD15NA.TH — — — — SEZ-KD18NA.TH PART NAMES AND FUNCTIONS SUZ-KA09NA SUZ-KA12NA SUZ-KA15NA OUTDOOR UNIT Air inlet (back and side) Piping Drain hose Air outlet Drain outlet SUZ-KA18NA OUTDOOR UNIT Air inlet (back and side)

  • Page 3: Specification

    SPECIFICATION Outdoor unit model SUZ-KA09NA SUZ-KA12NA SUZ-KA15NA SUZ-KA15NA Power supply V , phase , Hz 208/230 , 1 , 60 Max. fuse size (time delay) Min. circuit ampacity Fan motor F.L.A 0.50 0.93 Model KNB073FQDHC KNB092FQAHC SNB130FQBH R.L.A 10.0 Compressor L.R.A...

  • Page 4: Outlines And Dimensions

    OUTLINES AND DIMENSIONS SUZ-KA09NA SUZ-KA12NA SUZ-KA15NA Unit: inch REQUIRED SPACE Basically open 4 inch or more without any obstruction in front 15-3/4 Drain hole 1-5/8 and on both sides of the unit. Air in Air in 1-9/16 Air out 2- 3/8...

  • Page 5: Wiring Diagram

    WIRING DIAGRAM SUZ-KA09NA SUZ-KA12NA...
  • Page 6 SUZ-KA15NA...
  • Page 7 SUZ-KA18NA...

  • Page 8: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM SUZ-KA09NA Unit: inch (mm) Refrigerant pipe ø3/8 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler Discharge RT68 heat Flared connection temperature exchanger thermistor Service port RT62 Ambient...
  • Page 9 SUZ-KA18NA Unit: inch (mm) Muffler Refrigerant pipe ø 1/2 #100 4-way valve (with heat insulator) Stop valve Service port (with service port) Outdoor Flared connection Discharge heat Ambient Defrost temperature exchanger temperature thermistor thermistor thermistor RT61 RT62 RT65 Service port Compressor Outdoor heat exchanger...
  • Page 10 ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) Refrigerant piping exceeding 25 ft. requires additional refrigerant charge according to the calculation. Refrigerant piping length (one way): ft. Outdoor unit Model precharged 1 lb. 16 oz. SUZ-KA09NA 1.62 4.86 8.10 11.34 12.96 SUZ-KA12NA 2 lb. 9 oz.

  • Page 11: Data

    0.07 0.05 0.09 0.07 0.09 0.07 Current 0.51 0.39 0.57 0.46 0.74 0.63 0.74 0.63 Outdoor unit SUZ-KA09NA SUZ-KA12NA SUZ-KA15NA SUZ-KA18NA Power supply (V, phase, Hz) 230, 1, 60 Input 0.61 0.98 0.85 1.09 1.08 1.43 1.29 1.63 Current 2.80 4.33...

  • Page 12: Actuator Control

    ACTUATOR CONTROL SUZ-KA09NA SUZ-KA12NA SUZ-KA15NA SUZ-KA18NA 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 13: Service Function

    SERVICE FUNCTIONS SUZ-KA09NA SUZ-KA12NA SUZ-KA15NA SUZ-KA18NA 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 fi nish temperature Jumper...

  • Page 14: Failure Mode Recall Function

    10-2. Failure mode recall function As this air conditioner has a function to memorize all the failures that had happened, the latest failure detail can be recalled by following the procedures below. 10-2-1. Wired remote controller Turn on the power. CHECK button Refrigerant address Press the [CHECK] button twice.
  • Page 15 10-2-3. Outdoor unit failure mode table Indoor/ Outdoor unit Abnormal point LED indication outdoor unit Condition Remedy failure mode (Failure mode / protection) (Outdoor P.C. board) failure mode recall function recall function None (Normal) — — — — — Outdoor power system Overcurrent protection stop is continuously •...

  • Page 16: Troubleshooting Check Table

    10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ No. Symptom LED indication Condition Remedy Condition Outdoor 1-time fl ash every Outdoor power sys- Overcurrent protection stop is continuously performed 3 times • Reconnect connector of compressor. unit does 2.5 seconds within 1 minute after the compressor gets started, or failure of re- •...
  • Page 17 10-4. TROUBLE CRITERION OF MAIN PARTS SUZ-KA09NA SUZ-KA12NA SUZ-KA15NA SUZ-KA18NA Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a tester. Fin temperature Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. thermistor (RT64) board”, for the chart of thermistor.
  • Page 18 10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector (CN61) between compressor and the intelligent power module (IPM). See 10-5. “Check of open phase”. Check the voltage between terminals. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor.
  • Page 19 D Check of compressor winding ● Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance be- tween the compressor terminals. <<Measurement point>> at 3 points BLK - WHT Measure the resistance between the lead wires at 3 points. BLK - RED WHT - RED <<Judgement>>...
  • Page 20 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 10-6.1.) abnormal, replace the inverter P.C.
  • Page 21 I Check of outdoor fan motor SUZ-KA09/12/15NA Disconnect CN932 from the inverter P.C. board, and measure the resistance of the outdoor fan motor. Is the resistance of outdoor fan motor normal? Replace the outdoor fan motor. (Refer to 10-4.) Replace the inverter P.C. board. SUZ-KA18NA Check the connection between the connector CN931 and CN932.
  • Page 22 J Check of power supply Disconnect the connector (CN61) between compressor and intelligent power module. Rectify indoor/outdoor Turn ON power supply and press connecting wire. the TEST button twice. Is there voltage 208/230 VAC Replace the indoor Does the POWER lamp on remote between the indoor terminal electronic control P.C.
  • Page 23 K Check of LEV (Expansion valve) Self-check (Refer to 10-2-1.) start. Expansion valve operates in full-opening direction. 1. Regardless of normal or abnormal condition, a short beep Do you hear the expansion valve "click, is emitted once the signal is received. click·······"? Do you feel the expansion valve vibrate on touching it ?
  • Page 24 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the in- verter 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 TEST RUN.
  • 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 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 27 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board SUZ-KA09NA SUZ-KA12NA SUZ-KA15NA Smoothing Smoothing Smoothing Bus-bar voltage capacitor capacitor capacitor DB61 Fuse (F701) Back side of unit (C63) (C62) (C61) DC 260-325 V T3.15 AL 250 V Fuse (F801) AC 208/230 V 250 V 3.15 A...
  • Page 28 SUZ-KA18NA Smoothing Smoothing Smoothing R.V.coil Bus-bar voltage capacitor capacitor capacitor Fuse (F701) (CN721) DB61 Back side of unit (C63) (C62) (C61) T3.15 AL 250 V 208/230 DC 260-325 V Fuse (F801) AC 208/230 V 250 V 3.15 A Fuse (F901) T3.15 AL 250 V Output to drive...

  • Page 29: Function Setting

    FUNCTION SETTING 11-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER (S series only) 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 30 11-1-1. Selecting functions using the wired remote controller First, try to familiarize yourself with the flow of the function selection procedure. In this section, an example of setting the room temperature detection position is given. For actual operations, refer to steps Setting number Refrigerant address Unit number...
  • Page 31 [Operating Procedure] Check the function selection settings. Changing the function selection settings for each mode will change its relevant mode function. Perform steps through to check all the function selection settings, and write down the current settings in the Check column of the function selection <Table 1> in the chapter 11-1, and then change the settings as necessary. For the initial settings, refer to the <Table 1>...

  • Page 32: Disassembly Instructions

    Hold the sleeve, and Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector SUZ-KA09NA SUZ-KA12NA SUZ-KA15NA NOTE: Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel.
  • Page 33 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and panels. (Refer to 1.) Screws of the (2) Disconnect the lead wire to the reactor and the following relay panel connectors: <Inverter P.C. board> CN721 (R.V.
  • Page 34 OPERATING PROCEDURE PHOTOS Photo 6 5. Removing outdoor fan motor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller nut. (Photo 7) Outdoor heat (4) Remove the propeller.
  • Page 35 11-2. SUZ-KA18NA NOTE: Turn OFF power supply before disassembling. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screw of the top panel Screws of the cabinet (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
  • Page 36 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 Screws of the (1) Remove the cabinet and panels. (Refer to 1.) relay panel (2) Disconnect the lead wire to the reactor and the following con- nectors: <Inverter P.C.
  • Page 37 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient tem- exchanger tempera- perature ture thermistor and ambient temperature thermistor ture 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 40 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN New publication, effective Jan. 2010 CCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Specifications subject to change without notice Distributed in Jan. 2010 No.OCH467 PDF 4 Made in Japan...

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Suz-ka12naSuz-ka15naSuz-ka18na

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