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KOREL M2OC-18HFN8-Q, Service Manual

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KOREL M2OC-18HFN8-Q Service Manual Download Page 54

 

53 

10.4 Main parts check 

1.  Temperature sensor checking 

Disconnect the temperature sensor from PCB, measure the resistance value with a tester. 

 

Temperature Sensors. 

Room temperature(T1) sensor, 

Indoor coil temperature(T2) sensor, 

Outdoor coil temperature(T3) sensor, 

Outdoor ambient temperature(T4) sensor, 

Compressor discharge temperature(T5) sensor. 

Measure the resistance value of each winding by using the multi-meter. 

 

 

 

 

Summary of Contents for M2OC-18HFN8-Q

Page 1: ...KET SUPER DC INVERTER MULTI TYPE M2OG 14HFN8 Q X M2OC 18HFN8 Q K20C 18FN8 K20C 18HFN8 M2OD 18HFN8 Q x M3OF 21HFN8 Q K30 21FN8 M3OF 27HFN8 Q K30 27FN8 K30 37HFN8 M3OE 27HFN8 Q x M4OB 36HFN8 Q K40 36HFN...

Page 2: ...eet for installation 17 8 2 Connecting the cables 17 8 3 Pipe length and the elevation 17 8 4 Installation for the first time 18 8 5 Adding the refrigerant after running the system for many years 21 8...

Page 3: ...Z M2OC 18HFN8 Q 800x333x554 KSM135D23UFZ M2OD 18HFN8 Q 800x333x554 KSN140D21UFZ M3OF 21HFN8 Q 845x363x702 KSN140D21UFZ M3OE 27HFN8 Q 845x363x702 KTF235D22UMT M3OF 27HFN8 Q 845x363x702 KTM240D57UMT M4O...

Page 4: ...valves and prevents water from dripping 4 way valve control It is only operated in the heating operation mode except defrosting operation Outdoor unit Power relay control Hydrophilic aluminum fin Ant...

Page 5: ...0 333 554 860 514 340 M2OD 18HFN8 Q 800 333 554 860 514 340 M3OF 21HFN8 Q 845 363 702 923 540 350 M3OE 27HFN8 Q 845 363 702 923 540 350 M3OF 27HFN8 Q 845 363 702 923 540 350 M4OE 28HFN8 Q 946 410 810...

Page 6: ...c u m u la to r T 2 B A E v a p o ra to r te m p s e n s o r o u tle t T 2 B B 4 2 Refrigeration circuit drawing of inverter 1 drive 3 type L IQ U ID V A L V E A G A S V A L V E A H E A T E X C H A N...

Page 7: ...o ra to r te m p s e n s o r o u tle t T 2 B B T 2 B C T 2 B D 4 4 Refrigeration circuit drawing of inverter 1 drive 5 type L IQ U ID V A L V E A G A S V A L V E A H E A T E X C H A N G E E V A P O R...

Page 8: ...7 5 Wiring diagram M2OC 18HFN8 Q M2OG 14HFN8 Q...

Page 9: ...8 M2OD 18HFN8 Q...

Page 10: ...9 Note S 1 S 2 are used in other type of models They don t need to be connected in multi models...

Page 11: ...10 M3OE 27HFN8 Q...

Page 12: ...11 M3OF 21HFN8 Q M3OF 27HFN8 Q M4OE 28HFN8 Q...

Page 13: ...12 M4OB 36HFN8 Q...

Page 14: ...13 M5OD 42HFN8 Q...

Page 15: ...12 7 12 9 18 7 7 12 18 7 18 12 12 6 4 Indoor unit combination for M3OE 27HFN8 Q M3OF 27HFN8 Q One unit Two unit Three unit 7 7 7 7 18 9 18 7 7 7 7 9 12 9 12 12 9 7 9 9 9 12 12 7 7 9 7 12 12 12 12 12...

Page 16: ...18 18 7 9 12 24 9 9 9 24 12 12 12 18 7 7 9 12 7 9 9 9 7 9 18 18 9 9 12 12 Five Unit 7 7 7 7 7 7 7 7 9 18 7 7 9 12 12 7 9 9 9 18 9 9 9 12 12 7 7 7 7 9 7 7 7 12 12 7 7 9 12 18 7 9 9 12 12 9 9 12 12 12...

Page 17: ...del Noise Power dB A Noise level dB A M2OG 14HFN8 Q 64 57 M2OC 18HFN8 Q 56 53 M2OD 18HFN8 Q 65 55 5 M3OF 21HFN8 Q 66 57 5 M3OE 27HFN8 Q 65 59 M3OF 27HFN8 Q 67 59 5 M4OE 28HFN8 Q 69 61 M4OB 36HFN8 Q 68...

Page 18: ...the side panel of the unit Please refer to the nameplate before selecting the cable fuse and switch 8 3 Pipe length and the elevation Maximum piping length and height difference 1 drive 2 1 drive 3 1...

Page 19: ...iquid 6 35 1 4 5 Gas 9 52 3 8 4 12 7 1 2 1 8 4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below Pressure in the system rises Operating curre...

Page 20: ...lease check if there are some leakage points Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump Confirm that the gauge needle does not move approximately 5...

Page 21: ...harge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Operate the air conditioner at the cooling mode 5 Open the...

Page 22: ...careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Operate the air conditioner at the cooling mode 5 Open the valves Low side on the charge...

Page 23: ...rvice port 3 Air purging of the charge hose Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it quickly 4 Set the 2 way valve to t...

Page 24: ...pumping 50 minutes please check if there are some leakage points Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump Confirm that the gauge needle does not...

Page 25: ...position 2 Connect the vacuum pump to 3 way valve s service port 3 Evacuation for approximately one hour Confirm that the compound meter indicates 0 1Mpa 4 Close the valve Low side on the charge set t...

Page 26: ...charge set and charge the system with liquid refrigerant If the system cannot be charge with the specified amount of refrigerant or can be charged with a little at a time approximately 150g each time...

Page 27: ...function In standby the LED displays In compressor operation the LED display the running frequency In defrosting mode The LED displays dF or alternative displays between running frequency and dF each...

Page 28: ...A evaporator outlet temperature T2BA If the temperature is lower than 9 the digital display shows 9 If the temperature is higher than 70 the digital display shows 70 If the indoor unit is not connecte...

Page 29: ...requency limit caused by T3 Bit2 Frequency limit caused by T5 Bit1 Frequency limit caused by current Bit0 Frequency limit caused by voltage 43 Average value of T2 Sum T2 value of all indoor units numb...

Page 30: ...d frequency Cooling mode T 4 C o o lZ o n e 5 C o o lZ o n e 4 C o o lZ o n e 3 C o o lZ o n e 2 C o o lZ o n e 1 Heating mode T 4 H e a tZ o n e 4 H e a tZ o n e 3 H e a tZ o n e 2 H e a tZ o n e 1 9...

Page 31: ...cy for setting time and then resume to former frequency 2 The EXV will keep 300p while the indoor units will keep the current running mode If the outdoor ambient is higher than setting frequency durin...

Page 32: ...X 6 Water level alarm EE X 8 Overcurrent protection For some units F0 O 1 Open or short circuit of T4 temperature sensor F1 O 2 Open or short circuit of T3 temperature sensor F2 O 3 Open or short cir...

Page 33: ...tween the indoor PCB and display board Eb Overload current protection F0 Outdoor ambient temperature sensor T4 open circuit or short circuit F1 Condenser coil temperature sensor T3 open circuit or sho...

Page 34: ...ective F3 No C Indoor unit coil outlet temperature sensor or connector of sensor is defective F4 No D Indoor unit coil outlet temperature sensor or connector of sensor is defective F5 No E Indoor unit...

Page 35: ...it 10 3 1 1 Indoor EEPROM malfunction Yes Replace the indoor main PCB Power off then restart the unit 2 minutes later EEPROM An electrically erasable programmable read only memory whose contents can b...

Page 36: ...remote controller Is all indoor unit display Turn off the all indoor units Is IPM power LED or operating LED lamp On Refer PIC2 Yes A Is all the wiring between terminal and Indoor PCB connect ok No Y...

Page 37: ...2 IPM or outdoor main PCB Self Check Power Operating Self Check Operating Pic 2 IPM or outdoor main PCB Pic 1 check the voltage of N to S Vs is it moving alternately between positive value and negativ...

Page 38: ...37 PIC3 Main board LED when power on and unit standby PIC 4 check point button Press 1 time for check how many indoor units are connected...

Page 39: ...ood Check the wiring of fan motor Are all the connections good No Yes No Correct the connections Correct the connections No Replace the fan motor Replace the fan motor Yes Yes Replace the main PCB Rep...

Page 40: ...r Signal Voltage 1 Red Vs Vm 280V 380V 2 3 Black GND 0V 4 White Vcc 14 17 5V 5 Yellow Vsp 0 5 6V 6 Blue FG 14 17 5V For other types NO Color Signal Voltage 1 Red Vs Vm 192V 380V 2 3 Black GND 0V 4 Whi...

Page 41: ...al Yes 10 3 1 5 Water level alarm malfunction If the water level switch is inserted well If the water level switch is inserted well No Insert the water level switch well Insert the water level switch...

Page 42: ...of PFC module is good If the inductance is good the resistance of the two ports is 0 Yes Replace the inductance No Connect it tightly check normal or not Replace the outdoor main board Yes Yes No No R...

Page 43: ...it 10 3 3 1 Outdoor EEPROM malfunction ODU E0 Yes Replace the outdoor main PCB Replace the outdoor main PCB Power off then restart the unit 2 minutes later Power off then restart the unit 2 minutes la...

Page 44: ...IPM board light Check the signal wire between the IPM board and the main board is it connected good Reconnect and retry Is error still display Replace IPM board and then check whether the system can r...

Page 45: ...240VAC Check the power supply Check whether the voltage of IPM board P and N is normal DC277 356V for 18 27KBtu h DC277 410V for 36 42KBtu h Replace bridge rectifiers and then check whether the system...

Page 46: ...e fan are tighten Check the wiring of fan motor Are all the connections good Check the wiring of fan motor Are all the connections good No Yes No Correct the connections Correct the connections No Rep...

Page 47: ...ambient temperature is higher than 50 Check whether the outdoor ambient temperature is higher than 50 No Stop the unit Stop the unit Yes Check if the outdoor unit ventilation is good Check if the out...

Page 48: ...ssure protector is broken Whether the low pressure protector is broken Check whether the outdoor ambient temperature is too low Check whether the outdoor ambient temperature is too low No Stop the uni...

Page 49: ...temperature is higher than 50 No Stop the unit Yes Judge 3 Check whether the outdoor unit is bad ventilation No Make the outdoor unit ventilate well Yes Judge 5 The refrigerant pipe is blocked No Let...

Page 50: ...ring diagrams Measure the resistance value of compressor discharge temp sensor If the value is not normal is normal refer to the Appendix 2 Measure the resistance value of compressor discharge temp se...

Page 51: ...door unit ventilation is good Check if the outdoor unit ventilation is good Yes Make the outdoor unit ventilate well Make the outdoor unit ventilate well Check whether the heat exchanger is dirty Chec...

Page 52: ...sor check whether the system can work normally Check whether the lines in E part box are connected tightly Yes Connect it tightly check ok or not No No Yes No Replace the bridge rectifiers Check wheth...

Page 53: ...nit get warm Potential causes Faulty EXV Wire and piping connected in reverse Check of EXV please refer to part 5 in 10 4 Trouble Criterion Of Main Parts Automatic correction of wiring piping error Pr...

Page 54: ...e the resistance value with a tester Temperature Sensors Room temperature T1 sensor Indoor coil temperature T2 sensor Outdoor coil temperature T3 sensor Outdoor ambient temperature T4 sensor Compresso...

Page 55: ...1 34105 116 0 40060 3 41 5878 37 5 87359 77 1 29078 117 0 38991 2 39 8239 38 5 62961 78 1 25423 118 0 37956 1 37 1988 39 5 39689 79 1 21330 119 0 36954 0 35 2024 40 5 17519 80 1 17393 120 0 35982 1 33...

Page 56: ...9 5 234 9 35 35 78 75 8 084 115 2 422 4 222 8 36 34 32 76 7 82 116 2 357 3 211 4 37 32 94 77 7 566 117 2 294 2 200 7 38 31 62 78 7 321 118 2 233 1 190 5 39 30 36 79 7 086 119 2 174 0 180 9 40 29 15 80...

Page 57: ...56 2 Compressor checking Measure the resistance value of each winding by using the tester Position Resistance Value KSM135D23UFZ KTF235D22UMT KTF310D43UMT Blue Red 1 72 20 0 75 20 0 65 20...

Page 58: ...tester Normal resistance value Red Black Several M Red Black Several M P N U N U V V W W Red 4 4 way valve 1 Power on use a digital tester to measure the voltage when the unit operates in cooling it...

Page 59: ...58 5 EXV check Disconnect the connectors Resistance to EXV coil Color of lead wire Normal Value Red Blue About 50 Red Yellow Brown Orange 6 5 4 3 2 1 Red Brown Blue Orange Yellow White...

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