Mitsubishi Electric SUZ-KA24NAHZ Service Manual Download Page 1

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SERVICE MANUAL

CONTENTS

1. REFERENCE MANUAL ·····························2

2. SAFETY PRECAUTION ·····························2

3. FEATURES ·············································6

4. SPECIFICATIONS ····································7

5. DATA······················································9

6. OUTLINES AND DIMENSIONS ················· 13

7. WIRING DIAGRAM ································· 15

8. WIRING SPECIFICATIONS ······················ 17

9. REFRIGERANT SYSTEM DIAGRAM ············ 20

10. TROUBLESHOOTING ····························· 23

11. EASY MAINTENANCE FUNCTION ············ 74

12. FUNCTION SETTING ······························ 76

13. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER ··78

14. DISASSEMBLY PROCEDURE ·················· 87

15. REMOTE CONTROLLER ························100

No. OCH754

REVISED EDITION-A

R410A

December 2020

Note:

• This manual describes

service data of the

outdoor units only.

PARTS CATALOG (OCB754)

[Model Name]

[Service Ref.]

SUZ-KA24NAHZ

SUZ-KA30NAHZ

SUZ-KA36NAHZ

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SUZ-KA30NAHZ

SUZ-KA36NAHZ

SUZ-KA24NAHZ

Revision:

• Some descriptions

have been modified in

REVISED EDITION-A.

OCH754 is void.

Summary of Contents for SUZ-KA24NAHZ

Page 1: ...TORING THE OPERATION DATA BY THE REMOTE CONTROLLER 78 14 DISASSEMBLY PROCEDURE 87 15 REMOTE CONTROLLER 100 No OCH754 REVISED EDITION A R410A December 2020 Note This manual describes service data of the outdoor units only PARTS CATALOG OCB754 Model Name Service Ref SUZ KA24NAHZ SUZ KA24NAHZ SUZ KA30NAHZ SUZ KA30NAHZ SUZ KA36NAHZ SUZ KA36NAHZ SPLIT TYPE HEAT PUMP AIR CONDITIONERS SUZ KA30NAHZ SUZ KA...

Page 2: ...ts with wet hands Do not pour water into the electric parts Do not touch the refrigerant Do not touch the hot or cold areas in the refrigerating cycle When the repair or the inspection of the circuit needs to be done without turning off the power exercise great caution not to touch the live parts When opening or closing the valve below freezing temperatures refrigerant may spurt out from the gap b...

Page 3: ... flow back into refrigerant cycle and that can cause deterioration of refrigerant oil etc Use the following tools specifically designed for use with R410A refrigerant The following tools are necessary to use R410A refrigerant Handle tools with care If dirt dust or moisture enters into refrigerant cycle that can cause deterioration of refrigerant oil or malfunction of com pressor Do not use a charg...

Page 4: ...rant charge base 7 Refrigerant cylinder Only for R410A Top of cylinder Pink Cylinder with syphon 8 Refrigerant recovery equipment 1 Cautions for service 1 Perform service after recovering the refrigerant left in unit completely 2 Do not release refrigerant in the air 3 After completing service charge the cycle with specified amount of refrigerant 4 When performing service install a filter drier si...

Page 5: ...ve for R410A Gas leak detector Gas leak check Tool for HFC refrigerant Refrigerant recovery equipment Refrigerant recovery Tool exclusive for R410A Refrigerant cylinder Refrigerant charge Tool exclusive for R410A Applied oil Apply to flared section Ester oil and alkylbenzene oil minimum amount Safety charger Prevent compressor malfunction when charging refrigerant by spraying liquid refrigerant To...

Page 6: ... control the optimal refrigerant level regardless of the length maximum 100 ft 30 m and minimum 16 ft 5 m of piping The additional refrigerant charg ing work during installation often causes problems It is completely eliminated by chargelss system This unique system improves the quality and reliability of the work done It also helps to speed up the installation time SUZ KA30NAHZ SUZ KA36NAHZ SUZ K...

Page 7: ... A 0 33 0 33 0 33 Airflow m3 min 58 115 CFM 2050 4060 Sound pressure level SPL Cooling dB 52 52 Heating dB 53 53 Protection devices HP switch Comp Surface thermistor Dimensions W in 37 13 32 41 11 32 D in 12 63 64 63 64 H in 37 1 8 52 43 64 W mm 950 1050 D mm 330 25 H mm 943 1338 Weight lb 190 261 kg 86 118 Refrigerant R410A Charged lb 7 72 11 46 kg 3 5 5 2 Control Linear expansion valve Oil Charg...

Page 8: ... F L A 0 33 0 33 Airflow m3 min 115 CFM 4060 Sound pressure level SPL Cooling dB 52 Heating dB 53 Protection devices HP switch Comp Surface thermistor Dimensions W in 41 11 32 D in 12 63 64 63 64 H in 52 43 64 W mm 1050 D mm 330 25 H mm 1338 Weight lb 261 kg 118 Refrigerant R410A Charged lb 11 46 kg 5 2 Control Linear expansion valve Oil Charged Model FV50S oz 47 L 1 4 Refrigerant piping Pipe size...

Page 9: ...14 oz 21 oz 123 oz 0 2 kg 0 4 kg 0 6 kg 3 5 kg SUZ KA30NAHZ SUZ KA36NAHZ 183 oz 5 2 kg 5 2 COMPRESSOR TECHNICAL DATA Winding temperature at 68 F 20 C Service Ref SUZ KA24NAHZ SUZ KA30NAHZ SUZ KA36NAHZ Compressor model DNB28FBAMT ANB33FJMMT Winding Resistance Ω U V 0 74 0 188 U W 0 74 0 188 W V 0 74 0 188 5 DATA For pipes longer than 70 ft additional charge is required ...

Page 10: ...MATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 5 ft 3 3 ft MICROPHONE UNIT GROUND SUZ KA24NAHZ 10 20 30 40 50 60 70 80 90 63 125 250 500 1000 2000 4000 8000 OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 µbar BAND CENTER FREQUENCIES Hz COOLING MODE HEATING 52 SPL dB 53 LINE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOIS...

Page 11: ...10 104 Suction temperature F 51 39 57 45 Ref Pipe length ft 25 25 25 25 Discharge pressure Mpa 2 84 2 54 2 54 2 33 Suction pressure Mpa 0 90 0 73 1 01 0 77 Discharge temperature C 70 6 66 9 63 4 64 8 Condensing temperature C 47 9 42 5 43 6 39 8 Suction temperature C 10 8 4 2 14 1 7 2 Ref Pipe length m 7 6 7 6 7 6 7 6 Indoor side Intake air temperature D B F 80 70 80 70 Intake air temperature W B F...

Page 12: ...ction temperature F 50 45 Ref Pipe length ft 25 25 Discharge pressure Mpa 2 78 2 59 Suction pressure Mpa 0 86 0 71 Discharge temperature C 73 7 75 6 Condensing temperature C 47 3 43 4 Suction temperature C 9 9 7 4 Ref Pipe length m 7 6 7 6 Indoor side Intake air temperature D B F 80 70 Intake air temperature W B F 67 60 Discharge air temperature D B F 55 107 Outoor side Intake air temperature D B ...

Page 13: ...13 OCH754A 6 OUTLINES AND DIMENSIONS Unit mm in SUZ KA24NAHZ ...

Page 14: ...14 OCH754A Unit mm in SUZ KA30NAHZ SUZ KA36NAHZ 1 1 1 ...

Page 15: ...15 OCH754A 7 WIRING DIAGRAM SUZ KA24NAHZ ...

Page 16: ...16 OCH754A SUZ KA30NAHZ SUZ KA36NAHZ ...

Page 17: ...VDC Please follow applicable federal state or local codes to prevent potential leakage electric shock Or install a ground fault interrupt for the prevention of leakage and electric shock 1 Maximum 147 ft 45 m If AWG13 used maximum 164 ft 50 m If AWG13 used and S3 separated maximum 262 ft 80 m 2 The 30 ft 10 m wire is attached in the remote controller accessory Maximum 1500 ft 500 m 3 The figures a...

Page 18: ...unit power supplied from outdoor unit Indoor unit power supplied from outdoor unit Initial setting If the indoor and outdoor units have separate power supplies change the connections of the connectors as shown in the following figure Connectors Indoor unit control board Separate indoor unit outdoor unit power supplies Indoor unit control board Note There are 3 types of label A B and C Affix the ap...

Page 19: ... S3 separated Wire No o Size Be sure to connect the indoor outdoor connecting cables directly to the units no intermediate connections Intermediate connections can lead to communication errors if water enters the cables and causes insufficient insulation to ground or a poor electrical contact at the intermediate connection point Indoor unit Outdoor unit Indoor Outdoor separate power supply Max 393...

Page 20: ...ion valve B Linear expansion valve A Thermistor TH6 2 phase pipe Thermistor TH3 Liquid Charge plug Low pressure Charge plug High pressure Thermistor TH4 Discharge Compressor Strainer 50 Solenoid valve 4 way valve Strainer 100 Strainer 100 Strainer 100 Muffler Ball valve Thermistor TH33 Comp surface High pressure switch 63H Refrigerant flow in cooling Refrigerant flow in heating Thermistor TH8 Heat...

Page 21: ...re switch 63H For protection OFF 4 15MPa REV V Reversing 4 way valve 21S4 Change the refrigerant circuit Heating Cooling and for Defrosting Charge plug Charge plug High pressure Low pressure For production test use LEV A Linear expansion valve A Heating Secondary LEV Cooling Primary LEV LEV B Linear expansion valve B Heating Primary LEV Cooling Secondary LEV LEV C Linear expansion valve C For HIC ...

Page 22: ...Perform the refrigerant collecting operation cooling test run Push the pump down SWP switch push button type on the control board of the outdoor unit The compressor and ventilators indoor and outdoor units start operating refrigerant collecting operation begins LED1 and LED2 on the control board of the outdoor unit are lit Only push the pump down SWP switch if the unit is stopped However even if t...

Page 23: ...uble according to 10 4 TROUBLESHOOTING BY INFERIOR PHENOMENA The trouble is not reoccurring Logged 1 Consider the temporary defects such as the work of protection devices in the refrigerant circuit including compressor poor connection of wiring noise etc Re check the symptom and check the installation environment refrigerant amount weather when the trouble occurred matters related to wiring etc 2 ...

Page 24: ...Make sure that test run switch SW4 is set to OFF before turning on power supply Turn on power supply 12 hours before test run in order to protect compressor For specific models which requires higher ceiling settings or auto recovery feature from power failure make proper changes of settings referring to the description of 12 FUNCTION SETTING Make sure to read operation manual before test run Espec...

Page 25: ...ontroller 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 discharge temperature 49C worked insufficient refrigerant 6 Abnormal high pressure 63H worked...

Page 26: ...r controller circuit board a Disconnection of connector CNDC 4 Disconnection of reactor DCL 5 Defective outdoor power circuit board 6 Defective outdoor controller circuit board 1 Check following items a Power supply breaker b Connection of power supply terminal block TB1 c Connection of power supply terminal block TB1 2 Check following items a Connection of power supply terminal block TB1 b Connec...

Page 27: ...ff once and on again to check Replace outdoor controller circuit board indoor controller board or indoor power board if abnormality occurs again 7 Check if refrigerant addresses SW1 3 to SW1 6 on outdoor controller circuit board are overlapping in the case of group control system 8 Check transmission path and remove the cause Note The descriptions above 1 8 are for EA Eb and EC EA 6844 F5 5201 63H...

Page 28: ...ayed refer to Judgment and action for F5 7 Check linear expansion valve Refer to 10 5 HOW TO CHECK THE PARTS 8 Replace outdoor controller board Cause Check Code U2 1102 High discharge temperature 1 Abnormal if TH4 exceeds 257 F 125 C or 230 F 110 C continuously for 5 minutes Abnormal if TH4 exceeds 230 F 110 C or more continuously for 30 seconds after 90 seconds have passed since the defrosting op...

Page 29: ...1 Disconnection or contact failure of connectors TH4 TH33 on the outdoor controller circuit board 2 Defective thermistor 3 Defective outdoor controller circuit board 1 Check connection of connector TH4 TH33 on the outdoor controller circuit board Check break ing of the lead wire for TH4 TH33 Refer to 10 8 TEST POINT DIAGRAM 2 Check resistance value of TH4 TH33 or temperature by microprocessor Ther...

Page 30: ...more outside air temperature 50 rpm or below or 1500 rpm or more detected continuously for 1 minute U9 4220 Detailed codes To find out the detail history latest about U9 error turn ON SW2 1 2 2 and 2 6 Refer to 10 9 FUNCTION OF SWITCHES CONNECTORS AND JUMPERS 01 Overvoltage error Increase in DC bus voltage to 430 V 1 Abnormal increase in power source voltage 2 Disconnection of compressor wiring 3 ...

Page 31: ...c Increase in input current as follows KA24 42 A peak KA30 36 62 A peak 1 Abnormal increase in power source voltage 2 Decrease in power source voltage instantaneous stop 3 Disconnection of compressor wiring 4 Misconnection of reactor DCL 5 Defective outdoor power circuit board 6 Defective reactor DCL 7 Disconnection or loose connection of CN2 on the outdoor power circuit board controller circuit b...

Page 32: ...If abnormality occurs again replace indoor controller board b When NG is displayed replace remote controller c When E3 or ERC is displayed noise may be causing abnormality Note If the unit is not normal after replacing indoor controller board in group control indoor controller board of address 0 may be abnormal 1 Contact failure at transmission wire of remote controller 2 All remote controllers ar...

Page 33: ...r the unit as abnormal under the following condition When 2 or more indoor units are connected to an out door unit indoor controller board could not receive a signal for 3 minutes from outdoor controller circuit board a signal which allows outdoor controller circuit board to transmit signals Note Check LED display on outdoor controller circuit board Connect A Control service tool PAC SG50ST Refer ...

Page 34: ... after compressor start and 6 minutes after the liquid or condenser evaporator pipe is out of cooling range Note 1 It takes at least 9 minutes to detect Note 2 Abnormality P8 is not detected in drying mode Cooling range Indoor pipe temperature TH2 or TH5 room temperature TH1 5 4 F 3 C TH Lower temperature between liquid pipe temperature and condenser evaporator temperature Heating mode When 10 sec...

Page 35: ...ration of 4 way valve 2 Disconnection of or leakage in refrigerant pipes 3 Air into refrigerant piping 4 Abnormal operation no rotation of indoor fan Defective fan motor Defective indoor control board 5 Defective refrigerant circuit clogging 1 When this error occurs be sure to replace the 4 way valve 2 Check refrigerant pipes for disconnection or leakage 3 After the recovery of refrigerant vacuum ...

Page 36: ...because of noise etc Note The address and attribute displayed at remote controller indicate the con troller that detected abnormality 1 Transmission processor could not transmit signal because short cycle voltage of noise and the like have entered into transmission wire continuously 2 Transmission quantity has increased and transmission is not possible because there was wiring mistake of terminal ...

Page 37: ...mal 2 Check address switch of abnormality detect ed address 3 Check disconnection or looseness of abnor mality detected transmission wire terminal block and connector 4 Check if tolerance range of transmission wire is not exceeded 5 Check if type of transmission wire is correct or not If there were some troubles of 1 5 above repair the defective then turn off the power supply of outdoor unit and i...

Page 38: ...friger ant system with LOSSNAY is turned off or within 2 minutes of restart abnormality is detected 3 Contact failure of transmis sion wire of indoor unit of LOSSNAY 4 Disconnection of transmission connector CN2M of indoor unit 5 Defective transmitting receiv ing circuit of indoor unit or LOSSNAY 7 If displayed address or attribute is non existent 1 The unit of former address does not exist as add...

Page 39: ... blinking check indoor outdoor connecting wire for miswiring Converse wiring of S1 and S2 or break of S3 wiring 2 When LED3 is blinking indoor outdoor connecting wire is nor mal 4 Check LED display on outdoor controller circuit board Refer to 10 9 FUNCTION OF SWITCHES CONNECTORS AND JUMPERS Check protection device connector 63L and 63H for contact failure Refer to 10 8 TEST POINT DIAGRAM Abnormal ...

Page 40: ...f by the remote controller 12 Normal operation For protection of compressor 12 Normal operation 4 Even controlling by the IR wireless remote controller no beep is heard and the unit does not start operat ing Operation display is indicated on the IR wireless remote controller 1 The pair number settings of the IR wireless remote controller and indoor controller board are mismatched 1 Check the pair ...

Page 41: ...gnosis after turning on the main power Normal The startup diagnosis will be over in around 2 minutes Miswiring of indoor outdoor connecting wire Breaking of indoor outdoor connecting wire S3 Defective indoor controller board Defective outdoor controller circuit board Refer to Self diagnosis action table in order to solve the trouble In the case of communication errors the display of remote control...

Page 42: ...nit Check if the wiring is bad Check if the fuses are blown The fuses on the outdoor controller circuit board will be blown when the indoor outdoor connecting wire short circuits Bad wiring of the outdoor controller board The fuses on the outdoor controller circuit board are blown Check if miswiring breaking or poor contact is causing this problem Indoor outdoor connecting wire is polarized 3 core...

Page 43: ...he outdoor controller circuit board Normal Only the unit which has the refrigerant address 0 supplies power to the remote controller Set the refrigerant address to 0 In the case of the multiple grouping system recheck the refrigerant address again Defective indoor power board Replace the indoor power board Defective outdoor power circuit board Replace the outdoor power circuit board Defective indo...

Page 44: ...ntact of the remote controller wire Check the voltage of the terminal block TB5 connecting the remote controller wire If it is not between 10 VDC and 16 VDC the indoor controller board must be defective The remote controller wire short circuits Check if the remote controller wire is short circuited Defective indoor controller board Replace the indoor controller board Diagnosis flow Cause Inspectio...

Page 45: ...om the filter information of the maintenace menu See the operation manual that came with the product for how to clean the filters 3 Heat Standby is displayed on the screen 3 This is displayed when the unit starts HEAT operation when the thermostat puts the compressor in operation mode or when the outdoor unit ends DEFROST operation and returns to HEAT operation The display will automatically disap...

Page 46: ...controlling the airflow amount in order to keep the optimum operating condition 5 A sound similar to water flowing is heard from the unit 5 This is not a malfunction This is the sound when the refrigerant is flowing inside the indoor unit 2 The fan speed does not match the setting of the remote controller in HEAT operation The up down vane will be automatically set to horizontal blow in these case...

Page 47: ...above situations are released 3 The airflow direction does not change Up down vane left right louver 3 1 Check if the vane is set to a fixed position Check if the vane motor connector is removed 2 Check if the air conditioner has a function for switching the air direction 3 If the air conditioner does not have that function Unsupported function will be displayed on the remote controller when AIR D...

Page 48: ...rips down HEAT water drips down from the heat exchanger Note Make use of optional parts Drain Socket and Drain pan if these water needs to be collected and drained out for once Water or moisture is expelled from the outdoor unit Batteries are being exhausted Replace them and press the reset button of remote controller The display of wireless remote controller gets dim or does not come on The indoo...

Page 49: ...hermistor TH33 Comp surface Normal 160 to 410 kΩ 4 3 to 9 6 kΩ 39 to 105 kΩ TH4 TH33 TH3 TH6 TH7 TH32 TH8 Abnormal Open or short Measure the resistance between the terminals with a multimeter Ambient temperature 68 F 20 C Solenoid valve coil Four way valve 21S4 Motor for compressor MC Normal Model KA24 KA30 36 Model KA24 KA30 36 Abnormal Open or short 1190 3 119 Ω 1567 5 156 8 Ω 0 188 Ω 0 74 Ω Mea...

Page 50: ...C B and the defective fan motor MF1 2 Correct the wiring Replace the defective fan motor Replace the defective fan motor Replace the outdoor controller circuit board Replace the outdoor controller circuit board Fuse check Check the fuse F5 on outdoor controller circuit board FAN MOTOR MF1 Inverter driver Ground power supply inverter drive power supply gate drive rotation signal control voltage 7 6...

Page 51: ...e TH33 0 10 20 30 40 50 20 10 0 10 20 30 40 50 4 14 32 50 68 86 104122 C F Temperature Resistance k 500 400 300 200 100 0 25 50 75 100 120 77 122 167 212 248 C F Temperature Resistance k Thermistor R0 15 kΩ 3 B constant 3480 1 t Rt 15exp 3480 273 t 273 T F RT 15exp 3480 273 T 32 1 8 273 1 1 1 1 Thermistor R120 7 465 kΩ 2 B constant 4057 2 t C Rt 7 465exp 4057 273 t 393 T F RT 7 465exp 4057 273 T 3...

Page 52: ...ked sound can be heard than normal situation No sound is heard when the pulse number moves from B to A in case coil is burn out or motor is locked by open phase Sound can be detected by placing the ear against the screw driver handle while putting the screw driver to the linear expansion valve LEV M 1 6 ø4 ø4 ø3 ø2 ø1 1 Red Blue Orange Yellow White 2 3 4 5 Connector LEV A LEV B 12 V DC Outdoor con...

Page 53: ...ound can be heard than normal situation No sound is heard when the pulse number moves from B to A in case coil is burn out or motor is locked by open phase Sound can be detected by placing the ear against the screw driver handle while putting the screw driver to the linear expansion valve LEV M 1 6 ø4 ø4 ø3 ø2 ø1 1 Gray Orange Red Yellow Black 2 3 4 5 Connector LEV A LEV B LEV C 12 V DC Outdoor co...

Page 54: ...top per to main body At this time be careful that stress is not added to lead wire and main body is not wound by lead wire If the stop per is not firmly attached to main body coil may be detached from the main body and that can cause defective operation of linear expansion valve To prevent piping stress be sure to attach the coil holding the main body of linear expansion valve firmly Otherwise pip...

Page 55: ...al communication error 2 Check the following items and cautions for emergency operation 1 Make sure that there is no abnormality in outdoor unit other than the above abnormalities Emergency operation will not be available when check codes other than the above are indicated 2 For emergency operation it is necessary to set the emergency operation switch SWE on indoor controller board Refer to the el...

Page 56: ...C 41 F 5 C 45 F 7 C 5 54 F 30 C 9 F 5 C 1 1 1 1 2 Remarks 1 If the thermistor temperature data is normal not open short that data is loaded into the control as valid data If the unit enters emergency operation because TH values have become mismatched setting the thermistors to open short corrects the settings 2 If one thermistor is set to open short the values for each will be different Example Wh...

Page 57: ...rated 0 15 V pulse CNS S1 S2 208 230 VAC CNAC 2 to 4 Power supply for outdoor controller circuit board 208 230 VAC 1 to 3 Power supply for indoor and outdoor unit connection wire 208 230 VAC 21S4 4 way valve CN51 Water heater Comp protect CNDM 1 to 2 Input of low level sound priority mode 1 to 3 Input of external contact point SW7 Demand control setting Model select SV3 Solenoid valve D72 Cathode ...

Page 58: ...ly printed on the board CN6 Thermistor CN4 Connect to the outdoor controller circuit board CN4 NI LI Voltage of 208 230 VAC is input Connected to the terminal block TB1 EI E2 E3 E4 Connected to the ground CNDC 280 380 VDC 1 3 connect to the outdoor controller circuit board CNDC TB1A TB3A TB1B TB3B Connected to DCL CNAC1 CNAC2 208 230 VAC Connected to the outdoor controller circuit board CNAC CN2 C...

Page 59: ...oller circuit board CN2 1 5 Transmitting signal to outdoor controller circuit board 0 5 VDC 2 5 Zero cross signal 0 5 VDC 3 4 15 VDC 6 5 15 VDC 7 5 15 VDC P3 U V W N3 P2 L1 L2 L3 N2 S R P1 N1 Brief Check of POWER MODULE If they are short circuited it means that they are broken Measure the resistance in the following points connectors etc 1 Check POWER MODULE 1 Check of DIODE circuit R P1 S P1 R N1...

Page 60: ...tch SW1 1 2 No Function Effective timing Action by the switch operation Manual defrost Start Normal When compressor is working in heating operation Abnormal history clear Refrigerant address setting When power supply ON Clear Normal off or operating SWP 6 5 4 3 Under suspension Pump down Start Normal SW4 SW8 1 2 1 2 3 Test run Operating OFF Under suspension Test run mode setting Heating Cooling Us...

Page 61: ...w noise mode Normal Normal Normal When power supply ON Always Always Always Always 1 2 Model select CN31 Types Connector Function Effective timing Connector Start Short Open Action by open short operation Emergency operation When power supply ON Normal 2 Function of connector 2 Power failure automatic recovery can be set by either remote controller or this DIP SW If one of them is set to ON Auto r...

Page 62: ...o 0 100 of the normal consumption The demand function will be activated when a commercially available timer or the contact input of an ON OFF switch is added to the CNDM connector option on the control board of the outdoor unit 1 Complete the circuit as shown when using the external input adapter PAC SC36NA E Option 2 By setting SW7 1 on the control board of the outdoor unit the energy consumption...

Page 63: ...nnecting wire is connected correctly 2 Check if noise entered into indoor outdoor connecting wire or power supply 3 Check if noise entered into indoor outdoor controller board 4 Re check error by turning off power and on again Indoor outdoor unit communication error transmitting error is detected by indoor unit E7 Indoor outdoor unit communication error signal receiving error is detected by outdoo...

Page 64: ...ler board and connector CN6 on outdoor power board are not disconnected 2 Measure resistance value of outdoor thermistors P 29 Open short of outdoor thermistors TH3 TH32 TH6 TH7 and TH8 U4 P 29 6 blinking Abnormality of heatsink temperature U5 1 Check if indoor outdoor units have a short cycle on their air ducts 2 Measure resistance value of outdoor thermistor TH8 P 29 7 blinking Abnormality of vo...

Page 65: ...n the display blinks Inspection code is displayed when compressor stops due to the work of protection devices Display Contents to be inspected When power is turned on F3 F5 E8 E9 EA Eb EC E0 E7 63L connector red is open 63H connector yellow is open Indoor outdoor communication error Signal receiving error Outdoor unit Indoor outdoor communication error Transmitting error Outdoor unit Miswiring of ...

Page 66: ...is 100 hours or more hundreds digit tens digit and ones digit are displayed by turns Example When 2450 hours 245 10 hours 0 5 s 0 5 s 2 s 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Compressor operating current 0 to 50 LEV A opening pulse 0 to 480 0 to 50 Note Omit the figures after the decimal fractions 0 to 480 When it is 100 pulse or more hundreds digit tens digit and ones digit are displayed ...

Page 67: ...display of error unit number and code 37 to 433 3 to 217 C When the temperature is 100 F or more the hundreds digit tens digit and ones digit are displayed by turns Example When 130 F 0 5 s 0 5 s 2 s F C A Code display Code display 0 to 50 When no error history 0 and are displayed by turns When no error history 0 and are displayed by turns 1 ON 2 3 4 5 6 Thermostat ON time 0 to 999 Test run elapse...

Page 68: ...e 2 3 phase Setting details Defrosting switch Display details 0 Normal 1 For high humidity Example When heat pump 3 phase and defrosting normal are set up 20 is displayed 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Indoor pipe temperature Cond Eva TH5 1 Indoor 1 38 to 190 38 to 190 39 to 88 C When the temperature is 0 F 0 C or less and temperature are displayed by turns F C 38 to 190 39 to 88 C When the tempera...

Page 69: ... less and temperature are displayed by turns When the thermistor detects 100 F or more hundreds digit tens digit and ones digit are displayed by turns Outdoor outside temperature TH7 38 to 190 38 to 190 39 to 88 C When the temperature is 0 F 0 C or less and temperature are displayed by turns The black square indicates a switch position Pulse LEV B opening pulse 0 to 480 0 to 480 When it is 100 pul...

Page 70: ...d in the case of no postponement Code display Error history 3 Oldest Alternate display of abnormal unit number and code When no error history 0 and are displayed by turns 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 DC bus voltage 180 to 760 180 to 760 When it is 100 V or more hundreds digit tens digit and ones digit are displayed by turns V 1 ON 2 3 4 5 6 1 ON 2 3 4 5 6 Error thermistor display W...

Page 71: ...s and temperature are displayed by turns Example When 15 F 0 5 s 0 5 s 2 s 15 Outdoor pipe temperature 2 phase TH6 on error occurring 38 to 190 38 to 190 39 to 88 C When the temperature is 32 F 0 C or less and temperature are displayed by turns Example When 15 F 0 5 s 0 5 s 2 s 15 Outdoor ambient temperature TH7 on error occurring 38 to 190 38 to 190 39 to 88 C When the temperature is 32 F 0 C or ...

Page 72: ...ature are displayed by turns 1 ON 2 3 4 5 6 Indoor pipe temperature Cond Eva TH5 3 Indoor 3 38 to 190 38 to 190 39 to 88 C When the temperature is 0 F C or less and temperature are displayed by turns When there is no indoor unit 00 is displayed 1 ON 2 3 4 5 6 Controlling status of compressor operating frequency 1 ON 2 3 4 5 6 Code display The following code will be a help to know the operating sta...

Page 73: ...re displayed by turns Example When 15 C 0 5 s 0 5 s 2 s 15 F C Indoor pipe temperature Liquid TH2 4 Indoor 4 38 to 190 1 ON 2 3 4 5 6 F C 1 ON 2 3 4 5 6 Indoor pipe temperature Cond Eva TH5 4 Indoor 4 38 to 190 F C 38 to 190 39 to 88 C When the temperature is 0 F C or less and temperature are displayed by turns 38 to 190 39 to 88 C When the temperature is 0 F C or less and temperature are displaye...

Page 74: ...r and outdoor units by remote controller Furthermore use of maintenance stable operation control that fixes the operating frequency allows smooth inspection even for inverter models Remove the service panel Measure the intake air temperature Measure the discharge temperature Measure the outside air temperature Indoor unit Outdoor unit Smooth Mainte nance Function Conventional inspection work Easy ...

Page 75: ... heat exchanger temperature 7 Indoor intake air temperature Cool Classification Item Result Inspection Temperature difference Heat Inspection Temperature difference Stable Unstable Stable Unstable Fixed Hz operation may not be possible under the following tempera ture ranges A In cool mode outdoor intake air temperature is 40 or higher or indoor intake air temperature is 23 or lower B In heat mode...

Page 76: ...ller RF thermostat Function Settings Setting No Initial setting when sent from the factory Remarks 12 1 UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER Each function can be set set as necessary 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 1 Functions available when setting the unit number to 00...

Page 77: ...le Fan speed during the cooling thermo OFF Set fan speed Stop Available Not available Heater control 2 SEZ SLZ Set temp 4 5 F ON SEZ SLZ Set temp 1 8 F ON 23 123 1 2 Check SVZ KP NA PEAD A AA Ceiling suspended Multi position Heater present No heater present PEAD SVZ Heater not operation in Defrost Error PEAD SVZ Heater not operation in Defrost Error 4 11 111 Refer to the table below Refer to the t...

Page 78: ...ndoor unit Intake air temperature Unit No 3 Heat mode 4 degree correction Indoor unit Intake air temperature Unit No 4 Heat mode 4 degree correction Indoor unit Liquid pipe temperature Unit No 1 Indoor unit Liquid pipe temperature Unit No 2 Indoor unit Liquid pipe temperature Unit No 3 Indoor unit Liquid pipe temperature Unit No 4 Indoor unit Cond Eva pipe temperature Unit No 1 Indoor unit Cond Ev...

Page 79: ... information Outdoorunit Microprocessorversioninformation subNo 0 255 Refer to13 2 1 DetailContentsinRequestCode Refer to13 2 1 DetailContentsinRequestCode Refer to13 2 1 DetailContentsinRequestCode Refer to13 2 1 DetailContentsinRequestCode 0000 Not connected Examples Ver 5 01 Auxiliary information displayed after version information Examples Ver 5 01 A000 Ver Refer to13 2 1 DetailContentsinReque...

Page 80: ...umulated operating time at time of error Compressor Number of operation times at time of error Discharge temperature at time of error Outdoorunit Liquidpipe1temperature TH3 attimeoferror Outdoor unit Liquid pipe 2 temperature at time of error Outdoor unit 2 phase pipe temperature TH6 at time of error Outdoor unit Outside air temperature TH7 at time of error Outdoor unit Heat sink temperature TH8 a...

Page 81: ...an output value Pulsation ON OFF Indoor fan output value duty value Indoor unit Model setting information Indoor unit Capacity setting information Indoor unit SW3 information Wireless pair No indoor control board side setting Indoor unit SW5 information Indoor unit Microprocessor version information Indoor unit Microprocessor version information sub No Stable operation Heat mode Stable operation C...

Page 82: ...STOP FAN C COOL DRY H HEAT d DEFROST Relay output state Display Power currently Compressor Four way valve Solenoid valve supplied to compressor Unit No 4 state Unit No 3 state Unit No 2 state Unit No 1 state Display State 0 Normal 1 Preparing for heat operation 2 3 4 Heater is ON 5 Anti freeze protection is ON 6 Overheat protection is ON 7 RequestingcompressortoturnOFF F There are no corresponding...

Page 83: ...splay SV1 Four way valve Compressor 0 1 2 3 4 5 6 7 8 9 A b C d E F ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON Actuator output state 2 Display 52C SV2 SS 0 1 2 3 4 5 6 7 ON ON ON ON ON ON ON ON ON ON ON ON Error content U9 Request code 55 Data display Error content 1 Error content 2 0 0 Error content 1 Detected Display Overvoltage Undervoltage L...

Page 84: ...etting display Request code 70 Data display Capacity 10 18 9 12 11 24 14 30 20 36 25 42 Outdoor unit Setting information Request code 71 Data display Setting information 1 Setting information 2 0 0 Setting information 1 Display Defrost mode 0 Standard 1 For high humidity Setting information 2 Display Single Heat pump three phase cooling only 0 Single phase Heat pump 1 Cooling only 2 Three phase He...

Page 85: ...1 0 0 0 1 1 1 1 0 0 1 1 1 0 1 0 1 1 1 1 1 0 1 1 1 0 0 1 1 1 1 1 0 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 Outdoor unit switch setting display SW1 to SW10 except SW3 Request codes 73 to 82 0 Switch OFF 1 Switch ON Data display SW5 1 2 3 4 0 0 0 0 00 00 1 0 0 0 00 01 0 1 0 0 00 02 1 1 0 0 00 03 0 0 1 0 00 04 1 0 1 0 00 05 0 1 1 0 00 06 1 1 1 0 00 07 0 0 0 1 00 08 1 0 0 1 00 09 0 1 0 1 00 0A 1 1 0 1 00 0b 0 ...

Page 86: ... 3b 1C 3C 1d 3d 1E 3E 1F 3F Indoor unit Capacity setting information Request code 163 Data display 0 0 See the table on the right Display Capacity setting state Display Capacity setting state 00 10 42 01 11 02 12 03 13 04 14 05 15 06 12 16 07 17 08 18 09 18 19 0A 1A 0b 24 1b 0C 1C 0d 30 1d 0E 1E 0F 36 1F Display Pair No setting state 00 No 0 01 No 1 J41 disconnected 02 No 2 J42 disconnected 03 No ...

Page 87: ...e connector CNF1 SV2 LEV A and LEV B on the controller circuit board Symbols on the board CNF1 Fan motor LEV A LEV B LEV SV2 Base Heater 5 Disconnect the pipe side connections of the following parts Thermistor Liquid TH3 Thermistor Discharge TH4 Thermistor 2 phase pipe Ambient TH7 6 High pressure switch 63H 4 way valve coil 21S4 Thermistor Comp surface TH33 6 Remove the terminal cover and disconne...

Page 88: ...he lead wire in the rear of the electrical parts box See Photo 5 5 Pull out the thermistor Ambient TH7 from the sensor holder Note When replacing thermistor Ambient TH7 replace it together with thermistor 2 phase pipe TH6 since they are combined together Refer to procedure No 4 above to remove thermistor 2 phase pipe Photo 6 6 Removing the thermistor Discharge TH4 and thermistor Comp surface TH33 ...

Page 89: ...cover refrigerant without spreading it in the air Note 2 The welded part can be removed easily by removing the right side panel Note 3 When installing the 4 way valve cover it with a wet cloth to prevent it from heating 120 C or more then braze the pipes so that the inside of pipes are not oxidized 9 Removing the LEV 1 Remove the service panel See Photo 1 2 Remove the top panel See Photo 1 3 Remov...

Page 90: ...he air Note 2 The welded part can be removed easily by removing the right side panel Note 3 When installing the high pressure switch cover it with a wet cloth to prevent it from heating 100 C or more then braze the pipes so that the inside of pipes are not oxidized Photo 9 11 Removing the reactor DCL 1 Remove the service panel See Photo 1 2 Remove the top panel See Photo 1 3 Remove the electrical ...

Page 91: ...en remove the compressor Note Recover refrigerant without spreading it in the air Photo 11 13 Removing the power receiver 1 Remove the service panel See Photo 1 2 Remove the top panel See Photo 1 3 Remove 2 front cover panel fixing screws 5 12 and remove the front cover panel See Photo 1 4 Remove 2 back cover panel fixing screws 5 12 and remove the back cover panel 5 Remove the electrical parts bo...

Page 92: ...the connector housing Fan motor CNF1 Base heater SV2 Pull out the disconnected wire from the electrical parts box See Photo 4 6 Loosen the clamps on the side of the motor support and on the upper side of the separator 7 Remove 2 motor support fixing screws 4 x 10 then remove the motor support with fan motor still attached See Photo 13 8 Remove 4 base heater support fixing screws 4 x 10 then remove...

Page 93: ...e Photo 1 4 Remove a nut for right handed screw of M6 to detach the propeller See Photo 2 5 Disconnect the connectors CNF1 CNF2 on controller cir cuit board in electrical parts box 6 Remove 4 fan motor fixing screws 5 20 to detach the fan motor See Photo 3 Indicates the visible parts in the photos figures SUZ KA30NAHZ SUZ KA36NAHZ Indicates the invisible parts in the photos figures Photo 1 Top pan...

Page 94: ...parts Thermistor Liquid TH3 Thermistor Discharge TH4 Thermistor 2 phase pipe TH6 Thermistor Ambient TH7 Thermistor Suction TH32 Thermistor Comp surface TH33 High pressure switch 63H 4 way valve coil 21S4 6 Remove the terminal cover and disconnect the compressor lead wire 7 Loosen the clamp for lead wires on the separator 8 Remove 2 electrical parts box fixing screws 4 10 and detach the electrical ...

Page 95: ...rical parts box Loosen fasteners for lead wires in the electrical parts box 4 Loosen the clamp for lead wires in the rear of the electrical parts box 5 Pull out the thermistor 2 phase pipe TH6 and thermis tor Ambient TH7 from the sensor holder Note When replacing thermistor 2 phase pipe TH6 or thermistor Ambient TH7 replace it together Photo 5 Clamps Heat exchanger Thermistor 2 phase pipe TH6 Elec...

Page 96: ...anel See Photo 1 2 Disconnect the connectors TH3 white and TH32 black TH33 red on the controller circuit board in the electrical parts box Loosen fasteners for lead wires in the electrical parts box 3 Loosen clamps for the lead wires on the separator See Photo 7 Loosen clamp and cable strap for lead wires on the bottom of the electrical parts box Note that this procedure is only for removing TH32 ...

Page 97: ...Removing the 4 way valve coil 4 Remove 4 way valve coil fixing screw M5 7 5 Remove the 4 way valve coil by sliding the coil toward you Loosen the clamp for lead wires on the separator Loosen fasteners and the cable strap for lead wires in the electrical parts box 6 Disconnect the connector 21S4 green on the controller circuit board in the electrical parts box Removing the linear expansion valve co...

Page 98: ... electrical parts box Note 2 The 3 pieces of reactors to be replaced must have the same color of sticker Green Orange or Blue 12 Removing the compressor MC 1 Remove the service panel See Photo 1 2 Remove the top panel See Photo 1 3 Remove the electrical parts box See Photo 4 4 Remove the cover panel front Refer to procedure 8 5 Remove the cover panel rear Refer to procedure 8 6 Remove the valve be...

Page 99: ... symbol in the connector housing Fan motor CNF1 CNF2 Base heater SV2 Pull out the disconnected wire from the electrical parts box See Photo 4 6 Loosen the wire clamps on the side of the motor support and separator 7 Remove 2 motor support fixing screws 5 x 12 then remove the motor support with fan motor still attached See Photo 12 8 Remove 4 base heater cover fixing screws 4 x 10 then remove the b...

Page 100: ...ss to change the operation mode Menu screen The button function varies with the screen 2 SELECT HOLD button 7 Function button F1 Press to return to the previous screen Main display Press to decrease temperature Main menu Press to move the cursor left Menu screen The button function varies with the screen 3 RETURN button 8 Function button F2 4 MENU button 9 Function button F3 Press to bring up the ...

Page 101: ...units are operated in the energy saving mode Will not appear on some models of indoor units Appears when the built in thermistor on the remote control ler is activated to monitor the room temperature 1 appears when the thermistor on the indoor unit is acti vated to monitor the room temperature Appears when an energy saving operation is performed us ing a 3D i See sensor function Indicates the louv...

Page 102: ...u Manual vane angle ON OFF timer Auto return Clock Main Sub Temp range Auto OFF timer Schedule Daylight saving time Clock Administrator password Operation locked 3D i See sensor High power Vane Louver Vent Lossnay Comfort Timer Energy saving Basic setting Display setting Operation setting Restriction Weekly timer OU silent mode Timer menu Main display Display details Contrast Brightness Language s...

Page 103: ... run Model name input Function setting Error history Maintenance password Dealer information input Error information Test run menu Maintenance information Filter information Cleaning Settings menu Check menu Other menu Auto descending panel Descending operation Self check Descending adjustment Remote controller check Continue from the previous page Not all functions are available on all models of ...

Page 104: ...its over temperature control Set the Start Stop times for each day of the week Select the desired silent level from Normal Middle and Quiet Energy saving Restriction Temp range 2 Use to restrict the preset temperature range Different temperature ranges can be set for different operation modes Operation locked Use to lock selected functions The locked functions cannot be operated Energy saving Auto...

Page 105: ...r information Use to check the filter status The filter sign can be reset Cleaning Auto descending panel Use to lift and lower the auto descending panel Optional parts Service Test run Select Test run from the Service menu to bring up the Test run menu Test run Drain pump test run Input maintenance Select Input maintenance Info from the Service menu to bring up the Maintenance information screen T...

Page 106: ...signal transmitted from the remote controller has been received Signals can be received up to approximately 7 meters in a direct line from the indoor unit in an area 45 to the left and right of the unit However illumination such as fluorescent lights and strong light can affect the ability of the indoor unit to receive signals If the operation lamp near the receiver on the indoor unit is blinking ...

Page 107: ...ting Auto Set Temperature buttons Weekly timer ON OFF button Set Time button Sets the time Airflow button Changes up down airflow direction Mode button Changes operation mode Timer ON button Timer OFF button OFF ON button Fan Speed button Changes fan speed SET SEND button CANCEL button Up Down buttons Menu button i see button Reset button Remote controller display Transmission area 3D i see Sensor...

Page 108: ...el name and serial number will appear The model name and serial number will appear only if the informa tion has been registered Press the F1 or F2 button to go to the next page When an error occurs the following screen will appear Check the error status stop the operation and consult your dealer Contact information dealer s phone number will appear if the information has been registered 2 Press th...

Page 109: ...lter information Cleaning While no errors are occurring page 2 2 of the error information can be viewed by selecting Error information from the Maintenance menu Errors cannot be reset from this screen Checking the error information F1 F2 F3 F4 MENU ON OFF RETURN SELECT HOLD ...

Page 110: ...maintenance setting Maintenance password is required 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 111: ...e F1 button to go through the operation modes in the order of Cool and Heat Check the auto vane with the F1 F2 buttons Press the RETURN button to return to Test run operation Press the ON OFF button When the test run is completed the Test run menu screen will appear The test run will automatically stop after 2 hours The function is available only for the model with vanes Test run operation Auto va...

Page 112: ... whether the auto vane operates properly 7 Press the ON OFF button to stop the test run Note Point the remote controller towards the indoor unit receiver while following steps 2 to 7 It is not possible to run in FAN DRY or AUTO mode MODE MODE COOL HEAT TEST RUN FAN VANE TEST RUN 1 A B 2 3 15 4 3 PAR SL100A E 1 Press the button 1 to stop the air conditioner If the weekly timer is enabled is on pres...

Page 113: ...r when running 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 se...

Page 114: ... wireless remote controller toward the receiver of the indoor unit and press the button 3 Set the unit number Press the TEMP button to set the unit number Press 01 to specify the indoor unit whose unit number is 01 Direct the IR wireless remote controller toward the receiver of the indoor unit and press the button Notes 1 If a unit number that cannot be recognized by the unit is entered 3 beeps of...

Page 115: ... set Mode number B Fig 15 3 Direct the wireless remote controller toward the receiver of the indoor unit and press the button Current setting number 1 1 beep 1 second 2 2 beep 1 second each 3 3 beep 1 second each 4 Selecting the setting number Use the button to change the Setting number C Fig 15 4 Direct the wireless remote controller toward the receiver of the indoor unit and press the button 5 T...

Page 116: ...Check with the F1 or F2 button and press the SELECT button 3 16 error history records will appear 4 records are shown per page and the top record on the first page indicates the latest error record To delete the error history press the F4 button Delete on the screen that shows error history A confirmation screen will appear asking if you want to delete the error history Press the F4 button OK to d...

Page 117: ...r 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 that are correspond to the en...

Page 118: ...NET address B indoor unit and the number of blinks of the OPERATION INDICATOR lamp check is completed f 15 7 3 PAR SL100A E Procedure 1 Press the CHECK button twice CHECK lights and refrigerant address 00 blinks Check that the remote controller s display has stopped before continuing 2 Press the TEMP buttons Select the refrigerant address of the indoor unit for the self diagnosis Note Set refriger...

Page 119: ...s 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 replac ing ERC The number of data errors is the discrepancy between the number o...

Page 120: ...tton Ref address setting 0 15 Stable mode setting Cool Heat Normal Press the SELECT button Fixed operation will start Note Stable mode will take approx 20 minutes F1 F2 F3 F4 MENU ON OFF RETURN SELECT HOLD Smooth maintenance Return RETURN Smooth maintenance Return RETURN Smooth maintenance Return RETURN Page Page Page COMP current COMP run time COMP On Off COMP frequency A Hz Hr times Hr Ref addre...

Page 121: ...it 01 Remote controller 15 10 REQUEST CODE Details on the operation data including each thermistor temperature and error history can be confirmed with the remote controller Check menu Cursor Service menu MENU Error history Diagnosis Smooth maintenance Request code Select Request code with the F1 or F2 button and press the SELECT button Select Check with the F1 or F2 button and press the SELECT but...

Page 122: ... 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN CCopyright 2020 MITSUBISHI ELECTRIC CORPORATION Issued Dec 2020 No OCH754 REVISED EDITION A Published Oct 2020 No OCH754 Made in Japan Specifications are subject to change without notice ...

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Mitsubishi Electric SUZ-KA24NAHZ, Service Manual

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