Mitsubishi Electric Mr.SLIM SUZ-KA09NA Service Manual Download Page 2

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Air outlet

Drain outlet

Piping

Drain hose

Air inlet

(back and side)

COMBINATION OF INDOOR AND OUTDOOR UNITS

OUTDOOR UNIT

Piping

Air outlet

Drain hose

Drain outlet

Air inlet

(back and side)

SUZ-KA18NA

PART NAMES AND FUNCTIONS

SUZ-KA09NA

SUZ-KA12NA

SUZ-KA15NA

Heat pump type

Outdoor unit

SUZ-

SEZ-KD15NA.TH

SEZ-KD18NA.TH

—

Indoor unit

Service

Manual No.

Service Ref.

Heat pump without electric heater

KA18NA.TH

KA15NA.TH

HWE08020

KA12NA.TH

KA09NA.TH

—

SEZ-KD09NA.TH

SEZ-KD12NA.TH

OUTDOOR UNIT

Summary of Contents for Mr.SLIM SUZ-KA09NA

Page 1: ...ACTUATOR CONTROL 12 9 SERVICE FUNCTION 13 10 TROUBLESHOOTING 13 11 FUNCTION SETTING 29 12 DISASSEMBLY INSTRUCTIONS 32 HFC utilized R410A January 2010 R410A Outdoor unit Model names Service Ref SUZ KA09NA SUZ KA09NA TH SUZ KA12NA SUZ KA12NA TH SUZ KA15NA SUZ KA15NA TH SUZ KA18NA SUZ KA18NA TH NOTE This service manual describes service data of the outdoor units RoHS compliant products have G mark on...

Page 2: ...rain hose Drain outlet Air inlet back and side SUZ KA18NA PART NAMES AND FUNCTIONS 2 SUZ KA09NA SUZ KA12NA SUZ KA15NA Heat pump type Outdoor unit SUZ SEZ KD15NA TH SEZ KD18NA TH Indoor unit Service Manual No Service Ref Heat pump without electric heater KA18NA TH KA15NA TH HWE08020 KA12NA TH KA09NA TH SEZ KD09NA TH SEZ KD12NA TH OUTDOOR UNIT ...

Page 3: ...3 7 16 Weight Ib 66 77 80 119 External finish Munsell 3Y 7 8 1 1 Control voltage by built in transformer VDC 12 24 Refrigerant piping Not supplied Refrigerant pipe size Min wall thickness Liquid in 1 4 0 0315 Gas in 3 8 0 0315 1 2 0 0315 Connection method Indoor Flared Outdoor Flared Between the indoor outdoor units Height difference ft 40 50 Piping length ft 65 100 Refrigerant charge R410A 1 lb 1...

Page 4: ...es of the unit 14 in or more 8 in or more 4 in or more 4 in or more Open two sides of left right or rear side SUZ KA18NA 20 9 32 14 3 16 Air in 11 25 32 2 19 32 Air in Air out 19 11 16 33 1 16 13 2 4 25 32 33 7 16 16 15 16 3 3 16 4 3 8 13 16 slot 1 11 32 1 9 16 Drain 3 holes ø1 5 16 3 0 3 5 2 9 16 Liquid 1 4 flared Gas 1 2 flared 3 9 16 8 11 32 Open as a rule 20 inch or more if the front and both ...

Page 5: ...1 6 INVERTER P C BOARD 3 F901 BLU CN721 X63 2 1 1 RT65 CN643 RT62 RT61 CN641 4 1 CIRCUIT BREAKER BRN BLU BRN RED 1 2 S3 S2 S1 TB2 TB1 RT64 RT68 CN642 CN644 2 1 CN932 L61 C62 C63 LD70 LD66 DB61 DB65 TR821 F801 T801 1 3 P N W U V IC802 3 1 V W MS 3 MS MF 3 M LEV MC IPM U WHT RED BLK 3 1 RED WHT BLK BLU YLW ORN LDW LDV LDU CN61 6 CN724 1 21S4 1 1 2 2 1 OPTION PARTS YLW BLK BLK BLK BLK 1 H BLK CN722 3...

Page 6: ... 60Hz TO INDOOR UNIT CONNECTING WIRES 208 230V 1 phase 60Hz From INDOOR UNIT CONNECTING WIRES DC12 24V LD63 F701 X64 PTC64 BLK LD E1 PTC65 LD S LD62 LD61 6 3 BLU CN721 2 1 1 RT65 CN643 RT62 RT61 CN641 4 1 CIRCUIT BREAKER BRN BLU BRN RED 1 2 S3 S2 S1 TB2 TB1 RT64 RT68 CN642 CN644 2 1 L61 T801 1 IC802 BLU YLW ORN 6 CN724 1 21S4 1 1 2 2 1 OPTION PARTS YLW BLK BLK BLK BLK 1 H BLK CN722 3 1 X63 X66 4 t...

Page 7: ...T U W MC MF LEV MS 3 MS M 3 V 1 3 IC802 V U IPM W N P 3 1 HC930 T801 F801 TR821 DB65 DB61 LD66 LD70 C63 C62 C61 L61 CN932 CN644 CN642 RT68 RT64 L2 L1 TB1 TB2 S1 S2 S3 BRN 2 1 RED BRN BLU CIRCUIT BREAKER CN641 RT61 RT62 CN643 RT65 3 X63 CN721 F901 6 LD61 LD62 LD S PTC65 LD E1 BLK PTC64 X64 F701 LD63 NOTES 1 About the indoor side electric wiring refer to the indoor unit electric wiring diagram for s...

Page 8: ...68 Service port Service port Muffler SUZ KA12NA SUZ KA15NA Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve with strainar Stop valve with service port Refrigerant flow in cooling Compressor 4 way valve Refrigerant flow in heating Refrigerant pipe ø3 8 KA12 Refrigerant pipe ø1 2 KA15 with heat insulator Refrigerant p...

Page 9: ... 2 with heat insulator Refrigerant pipe ø1 4 with heat insulator LEV R V coil heating ON cooling OFF Muffler 100 Receiver Outdoor heat exchanger temperature thermistor RT68 Ambient temperature thermistor RT65 Strainer 100 Service port Service port Max Length A Max Height difference B Indoor unit Outdoor unit MAX REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Model Refrigerant piping ft Piping...

Page 10: ...0 1 62 4 86 8 10 11 34 12 96 SUZ KA12NA 2 lb 9 oz SUZ KA15NA Calculation X oz 1 62 5 oz ft Refrigerant piping length ft 25 Model Outdoor unit precharged Refrigerant piping length one way ft 25 30 40 50 60 70 80 90 100 SUZ KA18NA 3 lb 16 oz 0 1 08 3 24 5 40 7 56 9 72 11 88 14 04 16 20 Calculation X oz 1 08 5 oz ft Refrigerant piping length ft 25 NOTE Refrigerant piping exceeding 25 ft requires addi...

Page 11: ...KA12NA SUZ KA15NA SUZ KA18NA Power supply V phase Hz 230 1 60 Input kW 0 61 0 98 0 85 1 09 1 08 1 43 1 29 1 63 Current A 2 80 4 33 3 64 4 65 4 45 5 96 5 38 6 91 Refrigerant circuit Condensing pressure PSIG 398 448 387 386 399 389 373 397 Suction pressure PSIG 135 97 135 104 133 96 142 100 Discharge temperature F 148 170 162 165 159 182 150 172 Condensing temperature F 116 125 114 114 116 115 112 1...

Page 12: ... stopped running ON OFF Compressor Outdoor fan motor R V coil ON OFF ON OFF COOL 5 seconds HEAT 5 seconds 8 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Sensor Purpose Actuator Compressor LEV Outdoor fan motor R V coil Indoor fan motor Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protec tion Defrost thermistor Hea...

Page 13: ...wing 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for miswiring 2 Take care of the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller and turn off the breaker 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the electronic control P C ...

Page 14: ...ween indoor and outdoor units P8 Pipe temperature error E4 E5 Remote controller signal receiving error Fb Indoor unit control system error memory error etc E1 E2 Remote controller control board error E0 E3 Remote controller transmission error Output pattern B Errors detected by unit other than indoor unit outdoor unit etc Check code Symptom Remark E9 Indoor outdoor unit communication error Transmi...

Page 15: ...AT mode Temperature of outdoor heat exchanger temperature thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit and refrigerant amount Check stop valve Fin temperature P C board temperature 7 time flash 2 5 seconds OFF Temperature of fin temperature thermistor on the inverter P C board exceeds 167 176 F 75 80 C or temperature of P C board temperature thermistor on the inverter P C b...

Page 16: ...p valve 11 8 time flash 2 5 seconds OFF Compressor syn chronous abnormal ity The waveform of compressor current is distorted Reconnect connector of compressor Refer to 10 5 How to check inverter compressor 12 10 time flash 2 5 seconds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up Refer to 10 5 Check of outdoor fan motor Refer to 10 5 Ch...

Page 17: ...r to 10 6 Test point diagram and voltage 1 Inverter P C board for the chart of thermistor Compressor Measure the resistance between terminals with a tester Temperature 14 104 F 10 40 C Normal Ω KA09 KA12 KA15 18 U V U W V W 1 36 1 93 1 52 2 17 0 78 1 11 Outdoor fan motor Measure the resistance between lead wires with a tester Temperature 14 104 F 10 40 C Color of lead wire Normal Ω KA09 12 15 KA18...

Page 18: ...tton and switch to the COOL or HEAT mode 3 Compressor starts at rated frequency in COOL mode or 58 Hz in HEAT mode 4 Indoor fan operates at High speed 5 To cancel test run operation press the ON OFF button on remote controller Measurement point at 3 points BLK U WHT V BLK U RED W WHT V RED W NOTE 1 Output voltage varies according to power supply voltage 2 Measure the voltage by analog type tester ...

Page 19: ...rcuit check Contact of the compressor connector including CN61 Output voltage of inverter P C board and balance of them See 10 5 Direct current voltage between DB61 and on the inverter P C board Voltage between outdoor terminal block S1 S2 1 2 3 4 1 Heat the compressor with a drier for about 20 minutes Do not recover refrigerant gas while heating Heating part Connect the compressor and activate th...

Page 20: ... In case CN721 is disconnected or R V coil is open voltage is generated between the terminal pins of the connector although no signal is being transmitted to R V coil Check if CN721 is connected Is there 208 230 VAC between CN721 and on the inverter P C board 3 minutes after the power supply is turned ON No Yes Replace the inverter P C board Replace the 4 way valve Unit operates COOL mode even if ...

Page 21: ...utdoor fan motor normal Refer to 10 4 Check the connection between the connector CN931 and CN932 Disconnect CN932 from the inverter P C board and turn on the power supply Rotate the outdoor fan motor manually and measure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Does the voltage between each terminal become 5 and 0 VDC repeatedly Does the outdoor fan motor rotate smoothl...

Page 22: ...mote controller light up Does LED on the inverter P C board light up or flash Refer to 10 6 1 No Replace the inverter P C board Is there bus bar voltage 260 325 VDC between DB61 and DB61 on the inverter P C board Refer to 10 6 1 No Check the electric parts in main circuit Yes Yes No Disconnect the connector CN61 between compressor and intelligent power module Turn ON power supply and press the TES...

Page 23: ...ch voltage between connector pins of CN724 on the inverter P C board 1 Pin Pin 2 Pin Pin 3 Pin Pin 4 Pin Pin Is there about 3 5 VAC between each NOTE Measure the voltage with an analog tester Properly fix the LEV coil to the expansion valve Replace the LEV coil Replace the expansion valve Is LEV coil properly fixed to the expansion valve Does the resistance of LEV coil have the characteristics Ref...

Page 24: ...tion 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 Check the LED indication on the in verter P C board Does the LED flash 10 times Replace the inverter P C board Check the remedy following LED indication Refer to 10 3 Yes No Yes 10 time flash No ...

Page 25: ...of the residual voltage of smoothing capacitor Yes 3 Be sure to check this within 3 minutes after turning ON After 3 minutes LED blinks 6 times Even when the inverter P C board or the outdoor electronic control P C board is normal LED blinks 6 times after 3 minutes Is the bus bar voltage of the inverter P C board or the outdoor electronic control P C board normal Refer to TEST POINT DIAGRAM AND VO...

Page 26: ...ength or the installation condition combination of specific conditions such as antennas or wiring Check the followings before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of ...

Page 27: ...UZ KA15NA 10 6 TEST POINT DIAGRAM AND VOLTAGE Back side of unit Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 LEV connector CN724 Bus bar voltage DB61 DC 260 325 V Front side of unit AC 208 230 V Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Fuse F701 T3 15 AL 250 V Smoothin...

Page 28: ...f unit Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 LEV connector CN724 Bus bar voltage DB61 DC 260 325 V Front side of unit AC 208 230 V Smoothing capacitor C62 Output to drive compressor LDU LDV LDW Fuse F701 T3 15 AL 250 V Smoothing capacitor C61 Smoothing capacitor C63 Fuse F801 250 V 3...

Page 29: ...g is applied to all the units in the same refrigerant system Check 2 Functions are available when setting the unit number to 01 SEZ KD NA Function Settings No Mode No Setting Initial setting Factory setting Filter sign 100h 1 2500h 07 2 No filter sign indicator 3 External static pressure 5 15 35 50Pa 0 02 0 06 0 14 0 20in WG 08 10 1 2 Extra low 3 Fan speed during the heating thermo OFF Stop 25 1 S...

Page 30: ... setting Press Specified indoor unit FAN operation Change refrigerant address or unit No Switch to function setting mode Press and at the same time with stop the remote controller 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 positi...

Page 31: ...desired setting No Confirm the settings made at the steps through Press the button to flash the mode No and setting No and to start registration The mode No and setting No stop flashing to confirm the settings If the mode No or setting No shows and the temperature shows this seems to be a transmission error Check for noise source or interference around the transmission path To make additional sett...

Page 32: ... panel Service panel Screws of the top panel Screw of the cabinet Screws of the top panel Hooks Screw of the service panel Screw of the conduit cover Conduit plate Conduit cover 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out t...

Page 33: ...llowing connectors Inverter P C board CN721 R V coil 3 Remove the R V coil Photo 5 4 Removing the discharge temperature thermistor defrost thermistor outdoor heat exchanger tempera 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 connectors Inverter P C board CN641 Defrost thermistor and discha...

Page 34: ...abinet and panels Refer to 1 2 Remove the inverter assembly Refer to 2 3 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 4 Detach the welded part of the suction and the discharge pipe connected with compressor 5 Remove the nuts of compressor legs 6 Remove the compressor 7 Detach the welded part of pipes connected with 4 way valve Photo...

Page 35: ... Remove the top panel 6 Remove the valve cover 7 Disconnect the power supply and indoor outdoor connect ing wire 8 Remove the screws of the cabinet 9 Remove the cabinet 10 Remove the screws of the back panel 11 Remove the back panel Photo 1 Photo 2 Screws of the cabinet Screws of the back panel Screw of the top panel Screws of the cabinet Screws of the cabinet Screw of the valve cover Screw of the...

Page 36: ...e inverter assembly Photo 4 6 Remove the screw of the ground wire and screw of the T B support Photo 4 7 Remove the screw of the PB fixture 8 Remove the relay panel from the PB support 9 Remove the inverter P C board from the inverter assembly Photo 3 Photo 4 Inverter assembly Photo5 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connectors Inverter P C b...

Page 37: ... Removing outdoor fan motor 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller 4 Remove the screws fixing the fan motor 5 Remove the fan motor 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Rem...

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Page 40: ...RUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN CCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jan 2010 No OCH467 PDF 4 Made in Japan New publication effective Jan 2010 Specifications subject to change without notice ...

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