Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
R410A
Outdoor unit
[Model names]
SUZ-KA09NA
SUZ-KA12NA
SUZ-KA15NA
SUZ-KA18NA
SUZ-KA18NA.TH
[Service Ref.]
SUZ-KA09NA.TH
SUZ-KA12NA.TH
SUZ-KA15NA.TH
SUZ-KA18NA.TH
Revision:
• SLZ-KA·NA models have been
added as connectable indoor units.
• Some descriptions have been mod-
ified.
• Please void OCH467.
Note:
This service manual describes serv-
ice data of the outdoor units.
• RoHS compliant products have
<G> mark on the spec name plate.
CONTENTS
2. PART NAMES AND FUNCTIONS ...................... 2
3. SPECIFICATION ................................................. 3
4. OUTLINES AND DIMENSIONS .......................... 4
5. WIRING DIAGRAM ............................................ 5
6. REFRIGERANT SYSTEM DIAGRAM ................ 8
7. DATA ................................................................. 11
8. ACTUATOR CONTROL .................................... 13
9. SERVICE FUNCTION ....................................... 14
10. TROUBLESHOOTING ...................................... 14
11. FUNCTION SETTING ....................................... 30
12. DISASSEMBLY INSTRUCTIONS ..................... 33
PARTS CATALOG (OCB467)
July 2011
No.OCH467
REVISED EDITION-A
HFC
utilized
R410A
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric SUZ-KA09NA
Summary of Contents for Mitsubishi Electric SUZ-KA09NA
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Page 1: Table Of Contents
R410A SERVICE MANUAL R410A Outdoor unit Revision: [Model names] [Service Ref.] • SLZ-KA·NA models have been added as connectable indoor units. SUZ-KA09NA.TH • Some descriptions have been mod- SUZ-KA09NA ified. SUZ-KA12NA.TH • Please void OCH467. SUZ-KA12NA SUZ-KA15NA.TH Note: SUZ-KA15NA This service manual describes serv- ice data of the outdoor units. -
Page 2: Combination Of Indoor And Outdoor Units
— — OCH487 SLZ-KA12NA.TH — — — OCB487 SLZ-KA15NA.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 08/0 , 1 , 60 Max. fuse size (time delay) Min. circuit ampacity Fan motor F.L.A 0.50 0.9 Model KNB07FQDHC KNB09FQAHC SNB10FQBH 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...
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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 5 ft. requires additional refrigerant charge according to the calculation. Refrigerant piping length (one way): ft. Outdoor unit Model precharged SUZ-KA09NA 1 lb. 16 oz. SUZ-KA12NA 1.6 4.86 8.10 11.4 1.96 lb. 9 oz.
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Page 11: Data
0.07 0.05 0.09 0.07 0.09 0.07 Current 0.51 0.9 0.57 0.46 0.74 0.6 0.74 0.6 Outdoor unit SUZ-KA09NA SUZ-KA12NA SUZ-KA15NA SUZ-KA18NA Power supply (V, phase, Hz) 0, 1, 60 Input 0.61 0.98 0.85 1.09 1.08 1.4 1.9 1.6 Current .80 4.... - Page 12 0, 1, 60 Input 0.08 0.08 0.09 0.09 0.09 0.09 Current 0.5 0.5 0.40 0.40 0.65 0.65 Outdoor unit SUZ-KA09NA SUZ-KA12NA SUZ-KA15NA Power supply (V, phase, Hz) 0, 1, 60 Input 0.6 0.86 0.84 1.10 1.8 1.87 Current .1 4.0 .8 4.9...
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Page 13: 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 14: 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 finish temperature Jumper SUZ-KA09/12/15... -
Page 15: 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 Press the [CHECK] button twice. - Page 16 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 •...
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Page 17: Troubleshooting Check Table
10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ No. Symptom LED indication Condition Remedy Condition 1-time flash every Outdoor Outdoor power sys- Overcurrent protection stop is continuously performed times • Reconnect connector of compressor. unit does .5 seconds within 1 minute after the compressor gets started, or failure of re- •... - Page 18 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.
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Page 19: 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 of open phase”. See 10-5. Check the voltage between terminals. Are the voltages balanced? Replace the inverter P.C. board. “Check of compressor”. - Page 20 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 points BLK - WHT Measure the resistance between the lead wires at points. BLK - RED WHT - RED <<Judgement>>...
- Page 21 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 22 I Check of outdoor fan motor SUZ-KA09/12/15NA Disconnect CN9 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 CN91 and CN9.
- Page 23 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 08/0 VAC Replace the indoor Does the POWER lamp on remote electronic control P.C.
- Page 24 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 25 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the inverter P.C. board? Check the connection of the connectors (CN91, CN9) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting TEST RUN.
- Page 26 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 S? Check the wiring.
- Page 27 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 28 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 (C6) (C6) (C61) DC 60-5 V T.15 AL 50 V Fuse (F801) AC 08/0 V R.V.coil (CN71)
- Page 29 SUZ-KA18NA Smoothing Smoothing Smoothing Bus-bar voltage capacitor capacitor capacitor Fuse (F701) DB61 Back side of unit (C6) (C6) (C61) T.15 AL 50 V DC 60-5 V R.V.coil Fuse (F801) (CN71) AC 08/0 V 50 V .15 A 08/0 VAC Fuse (F901) T.15 AL 50 V Output to drive...
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Page 30: 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 31 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 32 [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>...
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Page 33: 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 34 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and panels. (Refer to procedure 1.) Screws of the () Disconnect the lead wire to the reactor and the following relay panel connectors: <Inverter P.C.
- Page 35 OPERATING PROCEDURE PHOTOS Photo 6 5. Removing outdoor fan motor (1) Remove the cabinet and panels. (Refer to procedure 1.) () Disconnect the following connectors: <Inverter P.C. board> CN91, CN9 (Fan motor) () Remove the propeller nut. (See Photo 7) (4) Remove the propeller.
- Page 36 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 () Remove the screws of the top panel. () Remove the screw of the valve cover.
- Page 37 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 Screws of the relay panel (1) Remove the cabinet and panels. (Refer to procedure 1.) () Disconnect the lead wire to the reactor and the following con- nectors: <Inverter P.C.
- Page 38 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient temperature ture thermistor and ambient temperature thermistor exchanger temperature thermistor thermistor (1) Remove the cabinet and panels. (Refer to procedure 1.) () Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
- Page 40 HEAD OFFICE : TOKYO BLDG., -7-, MARUNOUCHI, CHIYODA-KU, TOKYO 100-810, JAPAN CCopyright 010 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. New publication, effective Jul. 011 Distributed in Jul. 011 No.OCH467 REVISED EDITION-A Specifications subject to change without notice Distributed in Jan. 010 No.OCH467 PDF 4...