Mitsubishi Electric SUZ-KA09NAHZ Service Manual Download Page 31

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OCH709A

SUZ-KA15NAHZ.TH

SUZ-KA18NAHZ.TH

-4

86 104

100

Temperature(°F)

Defrost thermistor(RT61)

Ambient temperature thermistor(RT65)

Outdoor heat exchanger temperature thermistor(RT68)

32 50 68 86 104 122 140 158 176

100

120

140

160

180

200

Temperature(°F)

Fin temperature thermistor(RT64)

Resistance(k )

Temperature (°F)

Discharge temperature thermistor (RT62)

Resistance (kΩ)

100

200

300

400

500

600

700

800

32 50 68 86 104 122 140 158 176 194 212 230 248

Fin temperature

thermistor/RT64

(CN673)

Ambient temperature

thermistor/RT65

(CN672)

Discharge temperature

thermistor/RT62

(CN671)
Defrost thermistor

/RT61 (CN671)

Output to

drive outdoor

fan motor

(CN932)

Outdoor heat exchanger

temperature thermistor

/RT68 (CN671)

Fuse (F901)

T3.15AL250V

Fuse (F880)

T3.15AL250V

LEV (CN724)

Jumper wire for

changing defrost

setting (JS)

Jumper wire for

pre-heat control

setting (JK)

Fuse (F601)

T3.15AL250V

Signal of out-

door fan motor

(CN931)

R.V. coil (CN602)

208/230 V AC

260 - 370 V DC

IC700 (N)

IC700 (P)

LED

Heater (CN601)

208/230 V AC

Summary of Contents for SUZ-KA09NAHZ

Page 1: ...UNCTIONS 2 3 SPECIFICATION 3 4 OUTLINES AND DIMENSIONS 4 5 WIRING DIAGRAM 5 6 REFRIGERANT SYSTEM DIAGRAM 7 7 DATA 9 8 ACTUATOR CONTROL 14 9 SERVICE FUNCTIONS 15 10 TROUBLESHOOTING 15 11 FUNCTION SETTING 32 12 DISASSEMBLY INSTRUCTIONS 35 Note This manual describes service data of the outdoor units only No OCH709 REVISED EDITION A December 2019 SPLIT TYPE AIR CONDITIONERS SUZ KA09NAHZ TH OCH709 is v...

Page 2: ... KA09NAHZ TH SUZ KA12NAHZ TH SUZ KA15NAHZ TH SUZ KA18NAHZ TH Outdoor unit Indoor unit SUZ KA09NAHZ TH SUZ KA12NAHZ TH SUZ KA15NAHZ TH SUZ KA18NAHZ TH Service Ref Service Manual No SLZ KF09 12 15 18NA OCH669 OCB669 SEZ KD09 12 15 18NA4 HWE08020 BWE10180 PEAD 09 12 15 18AA7 HWE16080 BWE016290 SVZ KP12 18NA MD 1404 K019 MD 1404 K018 MLZ KP09 12 18NA OBH802 OBB802 ...

Page 3: ...ternal 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 0265 1 4 0 0265 Gas in 3 8 0 0285 1 2 0 0285 Connection method Indoor Flared Outdoor Flared Between the indoor outdoor units Height difference ft 40 50 Piping length ft 65 100 Refrigerant charge R410A 3 lb 9 oz 3 lb 12 oz Note T...

Page 4: ... 32 Service panel 3 29 32 6 1 2 7 11 16 3 5 4 4 Liquid refrigerant pipe joint Refrigerant pipe flared Ø 1 4 Gas refrigerant pipe joint Refrigerant pipe flared Ø 3 8 KA09 12 Refrigerant pipe flared Ø 1 2 KA15 18 1 20 in 500 mm or more when front and sides of the unit are clear 14 in 350 mm or more 4 in 100 mm or more REQUIRED SPACE Clear 1 4 in 100 mm or more 20 in 500 mm or more 2 2 When any 2 sid...

Page 5: ...5 OCH709A 5 WIRING DIAGRAM SUZ KA09NAHZ TH SUZ KA12NAHZ TH ...

Page 6: ...6 OCH709A SUZ KA15NAHZ TH SUZ KA18NAHZ TH ...

Page 7: ... Capillary tube O D 0 118 I D 0 079 7 7 8 ø3 0 ø2 0 200 4 Stop valve with service port Service port Service port Muffler Strainer 100 6 REFRIGERANT SYSTEM DIAGRAM Outdoor heat exchanger Flared connection Defrost thermistor RT61 Discharge temperature thermistor RT62 Flared connection Stop valve with strainer Stop valve with service port Capillary tube O D 0 157 I D 0 094 7 7 8 ø4 0 ø2 4 100 Refrige...

Page 8: ...ENCE Model Refrigerant piping ft Piping size O D in Max Length A Max Height difference B Gas Liquid SUZ KA09NAHZ 65 40 3 8 1 4 SUZ KA12NAHZ 65 40 3 8 1 4 SUZ KA15NAHZ 65 40 1 2 1 4 SUZ KA18NAHZ 100 50 1 2 1 4 ADDITIONAL REFRIGERANT CHARGE R410A oz No additional refrigerant charge up to the maximum refrigerant piping length ...

Page 9: ...A09NAHZ SUZ KA12NAHZ SUZ KA15NAHZ SUZ KA18NAHZ Power supply V phase Hz 230 1 60 Input kW 0 63 1 26 0 85 1 07 1 11 1 85 1 28 1 77 Current A 3 4 5 41 3 42 4 29 4 51 7 67 5 22 7 37 Refrigerant circuit Condensing pressure PSIG 339 513 357 393 378 425 359 391 Suction pressure PSIG 135 118 134 113 133 89 141 96 Discharge temperature F 137 163 147 162 149 172 149 173 Condensing temperature F 103 131 108 ...

Page 10: ... SUZ KA15NAHZ SUZ KA18NAHZ Power supply V phase Hz 230 1 60 Input kW 0 58 0 80 0 92 1 15 1 07 1 80 1 3 1 98 Current A 2 41 3 42 3 85 4 90 4 44 7 69 5 40 8 40 Refrigerant circuit Condensing pressure PSIG 340 423 335 428 375 506 354 512 Suction pressure PSIG 145 118 124 119 128 111 121 107 Discharge temperature F 137 162 139 162 149 172 159 171 Condensing temperature F 105 121 102 120 112 131 107 12...

Page 11: ...2NAHZ SUZ KA15NAHZ SUZ KA18NAHZ Power supply V phase Hz 230 1 60 Input kW 0 58 0 86 0 76 1 05 1 08 1 62 1 29 1 8 Current A 2 29 3 53 3 03 4 31 4 22 6 59 5 14 7 38 Refrigerant circuit Condensing pressure PSIG 340 421 348 335 379 392 359 383 Suction pressure PSIG 148 116 146 113 144 87 135 95 Discharge temperature F 137 162 140 162 149 172 156 159 Condensing temperature F 105 121 106 113 113 111 108...

Page 12: ...AHZ SUZ KA18NAHZ Power supply V phase Hz 230 1 60 Input kW 0 76 1 00 1 28 1 72 Current A 2 84 3 88 4 82 6 73 Refrigerant circuit Condensing pressure PSIG 351 338 359 373 Suction pressure PSIG 146 113 137 95 Discharge temperature F 140 162 158 167 Condensing temperature F 106 113 108 111 Suction temperature F 51 38 58 29 Ref pipe length ft 25 Refrigerant charge R410A 1 6 1 7 Indoor unit Intake air ...

Page 13: ...12NAHZ SUZ KA18NAHZ Power supply V phase Hz 230 1 60 Input kW 0 68 0 80 0 90 1 09 1 295 1 74 Current A 2 83 3 35 3 79 4 61 5 40 7 34 Refrigerant circuit Condensing pressure PSIG 337 404 345 399 356 476 Suction pressure PSIG 128 116 123 113 121 107 Discharge temperature F 137 162 142 163 153 180 Condensing temperature F 104 117 106 117 108 130 Suction temperature F 44 39 42 38 44 35 Ref pipe length...

Page 14: ...N 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 Heating Defrosting Fi...

Page 15: ...ng check the following 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 elect...

Page 16: ...ermistor frequency lowers How to check in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 A 10 2 TROUBLESHOOTING CHECK TABLE No Symptoms LED indication check code Abnormal point Condition Condition Remedy 1 Outdoor unit does not operate 1 time blink every 2 5 seconds UP Outdoor power system Overcurrent protection cut out operates 3 consecutive times within 1 minute after the compressor gets starte...

Page 17: ...number attribute will appear will appear if no error history is available 4 Resetting the error history Press the F4 button Reset on the screen that shows the error history A confirmation screen will appear asking if you want to delete the error history Press the F4 button OK to delete the error history If deletion fails Request rejected will appear Unit not exist will appear if no indoor units th...

Page 18: ...ing and indoor units OK No problems are found with the remote controller Check other parts for problems E3 6832 There is noise on the transmission line or the indoor unit or another remote controller is faulty Check the transmission line and the other remote controllers NG ALL0 ALL1 Send receive circuit fault The remote controller needs replacing ERC The number of data errors is the discrepancy be...

Page 19: ...ts an intermit tent buzzer sound the operation lamp blinks and the check code is output It takes 3 seconds at most for check code to appear 4 Point the remote controller at the sensor on the indoor unit and press the ON OFF button The check mode is cancelled Malfunction diagnosis method at maintenance service 10 3 3 Malfunction diagnosis method by IR wireless remote controller In the case of troub...

Page 20: ...ION INDICATOR lamp blinks Check code Number of times IR wireless remote controller Wired remote controller Errors detected by unit other than indoor unit outdoor unit etc Symptom Remark 1 Indoor outdoor unit communication error 2 Transmitting error Outdoor unit 3 Open short of outdoor unit thermistors 4 Compressor overcurrent interruption When compressor locked 5 Abnormal high discharging temperat...

Page 21: ...TEST POINT DIAGRAM AND VOLTAGE for the chart of thermistor Compressor Measure the resistance between terminals with a tester Temperature 14 to 104 F 10 to 40 C Normal Ω KA09 12 KA15 18 U V U W V W 0 82 to 1 11 0 83 to 1 03 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 KA15 18 RD BK BK WH WH RD 12 to 16 12 ...

Page 22: ...d 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 BK U WH V BK U RD W WH V RD W NOTE 1 Output voltage varies according to power supply voltage 2 Measure the voltage by analog type tester 3 During this...

Page 23: ...nverter P C board and balance of them See 10 5 3 Direct current voltage between DB61 and on the inverter P C board 4 Voltage between outdoor terminal block S1 S2 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 the inverter Then measure the time until the inverter stops due to over current Operatio...

Page 24: ... V coil First of all measure the resistance of R V coil to check if the coil is defective Refer to 10 4 TROUBLE CRITERION OF MAIN PARTS 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 min...

Page 25: ... No No Yes J Check of power supply Is there voltage 208 230 VAC between the indoor terminal block S1 and S2 No Yes Replace the indoor electronic control P C board Rectify indoor outdoor connecting wire Yes If light up OK If blink refer to 10 3 HOW TO PROCEED SELF DIAGNOSIS Does the POWER lamp on remote controller light up Does LED on the inverter P C board light up or blink Refer to 10 6 TEST POIN...

Page 26: ... 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 correct it Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in verter P C board Does the LED blink 10 times R...

Page 27: ...supply Does the LED on the inverter P C board or the outdoor electronic control P C board repeat 3 6 second OFF and 0 8 second ON quick blinking 3 Yes KA15 18 KA09 12 No Lighted or not lighted Replace the inverter P C board or the outdoor electronic control P C board 2 2 Be careful of the residual voltage of smoothing capacitor Turn OFF the power supply Remove the bridge between outdoor terminal b...

Page 28: ...is leaking from and fix the leak CAUTION Do not start the operation again to prevent hazards N Check the defrost heater base pan heater 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 Does the heater protector remain conducted ...

Page 29: ... strength 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...

Page 30: ...76 194 212 230 248 Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 CN643 Discharge temperature thermistor RT62 CN641 Defrost thermistor RT61 CN641 DB61 260 370 V DC Front side of unit 208 230 V AC Output to drive compressor LDU LDV LDW Fuse F701 T3 15AL250V R V coil CN721 208 230 V AC Jumper wire for changing defrost setting JS Signal of outdoor fan motor CN931 208 230 V ...

Page 31: ...0 100 200 300 400 500 600 700 800 32 50 68 86 104 122 140 158 176 194 212 230 248 Fin temperature thermistor RT64 CN673 Ambient temperature thermistor RT65 CN672 Discharge temperature thermistor RT62 CN671 Defrost thermistor RT61 CN671 Output to drive outdoor fan motor CN932 Outdoor heat exchanger temperature thermistor RT68 CN671 Fuse F901 T3 15AL250V Fuse F880 T3 15AL250V LEV CN724 Jumper wire f...

Page 32: ...0in WG 70Pa 0 28in WG 100Pa 0 40in WG 150Pa 0 60in WG 2 3 1 2 3 Mode No 08 Mode No 10 1 1 2 2 2 Check Initial setting Factory setting External static pressure Setting No 75Pa 0 3in WG 125Pa 0 5in WG 200Pa 0 8in WG 1 2 3 Mode No 08 Mode No 10 1 1 1 Check Initial setting Factory setting External static pressure setting for SEZ External static pressure setting for SVZ Vertical Horizontal left Horizon...

Page 33: ...n and select Service to make the maintenance setting 3 If the password matches the Service menu will appear The type of menu that appears depends on the connected indoor units type A screen will appear that indicates the setting has been saved Navigating through the screens To go back to the Service menu MENU button To return to the previous screen RETURN button Note The initial maintenance passwo...

Page 34: ...ing all units all indoor units for the selected refrigerant address will start fan operation Function setting Ref address Sending data 5 When the settings are completed press the SELECT button to send the setting data from the remote controller to the indoor units When the transmission is successfully completed the screen will return to the Function setting screen Note Make the above settings only...

Page 35: ...ing the cabinet 1 Remove the screws of the service panel 2 Remove the screws of the top panel 3 Remove the screw of the valve cover 4 Remove the service panel 5 Remove the screws fixing the conduit cover 6 Remove the conduit cover 7 Remove the screw of fixing the conduit plate 8 Remove the conduit plate 9 Remove the top panel 10 Remove the valve cover 11 Disconnect the power supply and indoor outd...

Page 36: ...verter assembly 7 Remove the screw of the ground wire screw of the P C board cover and screws of the terminal block support 8 Remove the heat sink support from the P C board support 9 Remove the screw of the inverter P C board and the inverter P C board from the P C board support Photo 5 Photo 6 1 KA09 12 Photo 6 2 KA15 18 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect...

Page 37: ...et and service panel Refer to 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller fan nut 4 Remove the propeller fan 5 Remove the screws fixing the fan motor 6 Remove the fan motor NOTE The propeller fan nut is a revers thread 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the ba...

Page 38: ... 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued Dec 2019 No OCH709 REVISED EDITION A Published Nov 2019 No OCH709 Made in Japan Specifications are subject to change without notice ...

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