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protection in cooling mode, defrosting mode and the current protection.

7.4.2.3 Indoor fan running rules

In cooling mode, indoor fan runs all the time and the speed can be selected as high, medium, low

and auto.

The auto fan:

T1-Ts

High

Low

Medium

7.4.2.4 Low evaporator coil temperature T2 protection

T2

On

Off

When the evaporator coil temp.T2 keeps lower than setting value, the compressor and outdoor

fan will shut off.

7.4.2.5 High condenser temperature T3 protection(only for MS12F-21HR-NB8W)

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Summary of Contents for PAC1203711

Page 1: ...Service Manual PAC1203711 PAC1803711 PAC2403711 ...

Page 2: ...on 14 5 4 Installation for the first time 15 5 5 Adding the refrigerant after running the system for many years 19 5 6 Re installation while the indoor unit need to be repaired 20 5 7 Re installation while the outdoor unit need to be repaired 22 6 Operation Characteristics 25 7 Electronic function 26 7 1 Abbreviation 26 7 2 Display function 26 7 3 Main Protection 27 7 4 Operation Modes and Functio...

Page 3: ...r the product there is risk of fire or electric shock Always ground the product There is risk of fire or electric shock Install the panel and the cover of control box securely There is risk of fire of electric shock Always install a dedicated circuit and breaker Improper wiring or installation may cause fore or electric shock Use the correctly rated breaker of fuse There is risk of fire or electri...

Page 4: ...r electric shock Do not touch operation the product with wet hands Do not place a heater or other appliance near the power cable There is risk of fire and electric shock Do not allow water to run into electrical parts It may cause fire failure of the product or electric shock Do not store or use flammable gas or combustible near the product There is risk of fire or failure of product Do not use th...

Page 5: ... damage or failure or unintended operation Take care to ensure that nobody could step on or fall onto the outdoor unit This could result in personal injury and product damage CAUTION Always check for gas refrigerant leakage after installation or repair of product Low refrigerant levels may cause failure of product Install the drain hose to ensure that water is drained away properly A bad connectio...

Page 6: ...ilter securely Clean the filter every two weeks or more often if necessary A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage Do not insert hands or other objects through air inlet or outlet while the product is operated Do not drink the water drained from the product Use a firm stool or ladder when cleaning or maintaining the product Be care...

Page 7: ...2 Function Model Names of Indoor Outdoor Units On Off Capacity Indoor units Outdoor units 12k PAC1203711 PAC1203711 18k PAC1803711 PAC1803711 24k PAC2403711 PAC2403711 ...

Page 8: ...3 Dimension 3 1 Indoor Unit W D H Model W D H PAC1203711 800 188 275 PAC1803711 940 205 275 PAC2403711 1045 235 315 ...

Page 9: ...Model L mm R mm H mm Dimension of installation hole mm PAC1203711 100 95 45 65 PAC1803711 110 100 45 ...

Page 10: ...Model L mm R mm H mm Dimension of installation hole mm PAC2403711 293 163 45 65 H L R ...

Page 11: ...an 30cm More than 60cm More than 200cm More than 30cm More than 60cm Service space Fence or obstacles Model W D H W1 A B PAC1203711 780 250 540 843 549 276 PAC1803711 845 320 700 908 560 335 PAC2403711 845 320 700 908 560 335 ...

Page 12: ...rant Cycle Diagram For cooling only models INDOOR OUTDOOR LIQUID SIDE GAS SIDE HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER COMPRESSOR CAPILIARY TUBE T2 Evaporator temp sensor T1 Room temp sensor ACCUMULATOR ...

Page 13: ... 3 4 6500 663kgf cm 6700 683kgf cm 5 2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet Rated current of appliance Nominal cross sectional area mm 3 and 6 0 75 6 and 10 1 10 and 16 1 5 16 and 25 2 5 The cable size and the current of the fuse or switch are determined by the maximum current indicated on the nameplate which located on ...

Page 14: ...ength A m Additional refrigerant g m Gas Liquid PAC1203711 PAC1203711 1 2 Ф12 7 1 4 Ф6 35 5 8 20 20 PAC1803711 PAC1803711 1 2 Ф12 7 1 4 Ф6 35 5 10 25 20 PAC2403711 PAC2403711 5 8 Ф15 9 3 8 Ф9 52 5 10 25 40 Caution The capacity test is based on the standard length and the maximum permissive length is based on the system reliability ...

Page 15: ...and outdoor units must be leak tested and evacuated to remove gas and moisture from the system Gas leak check Soap water method Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit connections by a soft brush to check for leakage of the connecting points of the piping If bubbles come out the pipes have leakage 1 Air purging with vacuum pump Indoor unit Liqu...

Page 16: ...ld be pumped 20 minutes more If the pressure can t achieve 0 1Mpa after 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 move approximately 5 minutes after turning off the vacuum pump 7 Turn the flare nut of the 3 way valves about 45 counterclockwis...

Page 17: ...he flare nut on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3 to 0 5 Mpa 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3 way valves to the o...

Page 18: ...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 valves Low side on the charge set and charge the system with liquid refrigerant 6 When the electronic scale displays the proper weight refer to the table disconnect the charge hose from the 3 way val...

Page 19: ...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 set and charge the system with liquid refrigerant 6 When the electronic scale displays the proper weight refer to the gauge and the pressure of the low side disconnect the charge hose from the 3 way ...

Page 20: ...ervice 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 the close position 5 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0 1MPa 6 Set the 3 way valve to the closed position immediately Do this quickly so that the g...

Page 21: ...hen closing it for 1 minute repeat 3 times After purging the air use a torque wrench to tighten the flare nut on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3 to 0 5 Mpa ...

Page 22: ...t both the 2 way and 3 way valves are set to the opened 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 turn off the vacuum pump and confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 5 Disconnect t...

Page 23: ...e and record the weight 4 Open the valves Low side on the 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 operating the air conditioner in the cooling cycle however one time is not sufficient wait approximately 1 minute and then repeat the procedur...

Page 24: ...Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage ...

Page 25: ...t to operate abnormally 2 The room relative humidity should be less than 80 If the air conditioner operates beyond this figure the surface of the air conditioner may attract condensation Please set the vertical air flow louver to its maximum angle vertically to the floor and set HIGH fan mode 3 The optimum performance will be achieved during this operating temperature zone ...

Page 26: ...mp illuminates when Clean Air feature is activated DEFROST indication lamp For cooling heating models only Lights up when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating operation OPERATION indication lamp This lamp illuminates when the air conditioner is in operation TIMER indication lamp Lights up during Timer operation Temperature...

Page 27: ...not correct the unit will stop and the LED will display the failure The correct zero crossing signal time interval should be between 6 13ms 7 3 4 Fan Speed is out of control When Indoor Fan Speed is too low lower than 300RPM lasting 2 minutes the unit stops and LED displays failure information and can t returns to normal operation automatically 7 3 5 Current protection A B C Resume The current exc...

Page 28: ...the same as in cooling mode 5 Auto fan High Low Medium 7 4 2 Cooling Mode 7 4 2 1 Compressor running rules When indoor room temp T1 is lower than setting value the compressor and outdoor fan will shut off T1 On Off 7 4 2 2 Outdoor fan running rules The On off outdoor units have single fan speed The outdoor fan will run following the compressor except when AC is in evaporator high temp protection i...

Page 29: ...time and the speed can be selected as high medium low and auto The auto fan T1 Ts High Low Medium 7 4 2 4 Low evaporator coil temperature T2 protection T2 On Off When the evaporator coil temp T2 keeps lower than setting value the compressor and outdoor fan will shut off 7 4 2 5 High condenser temperature T3 protection only for MS12F 21HR NB8W ...

Page 30: ...n setting value the compressor and outdoor fan will shut off T1 Off On 7 4 3 2 Outdoor fan running rules The outdoor units have single fan speed The outdoor fan will run following the compressor except when AC is in evaporator high temp protection in heating mode condenser high temp protection in cooling mode defrosting mode and the current protection 7 4 3 3 Indoor fan running rules When the comp...

Page 31: ...3 and the value range of temp change of T3 and also the compressor running time During the defrosting mode the compressor keep running indoor and outdoor motor will stop defrost lamp of the indoor unit will be lighted Will be displayed 7 4 3 5 High evaporator coil temp T2 protection When the evaporator coil temp T2 keeps more than setting value the compressor and outdoor fan will shut off 7 4 3 Au...

Page 32: ...he compressor will stop and not resume until room temperature exceeds 13 8 4 5 3 The evaporator anti freezing protection is the same as that in cooling mode 7 4 6 Forced operation function Press the touch button continually the AC will run as below sequence Forced auto Forced cooling Off Forced cooling mode The compressor and outdoor fan keep running and the indoor fan runs at low speed After runn...

Page 33: ... memorization condition is forced cooling mode the unit will run in cooling mode for 30 minutes and turn to auto mode as 24 setting temp If AC is off before power off and AC is required to start up now the compressor will have 1 minute delay when power on Other conditions the compressor will have 3 minutes delay when restarts 7 4 8 Refrigerant Leakage Detection With this new technology the display...

Page 34: ...m temperature sensor T1 open circuit or short circuit 6 times X E6 Evaporator coil temperature sensor T2 open circuit or short circuit 7 times X E7 Condenser coil temperature sensor T3 or T4 open circuit or short circuit only for MS12F 21HR NB8W 2 times O EC Refrigerant Leakage Detection 9 times X E9 Indoor outdoor units communication error only for MS12F 21CR NB4W MS12F 21CRN1 NB6W and MS12F 24CR...

Page 35: ... 1 EEPROM parameter error diagnosis and solution Yes Replace the indoor outdoor main PCB Power off then restart the unit 2 minutes later EEPROM a read only memory whose contents can be erased and reprogrammed using a pulsed voltage ...

Page 36: ...s been out of control diagnosis and solution Power off then restart the unit 2 minutes later Shut off the power supply Rotate the fan by hand The unit operates normally Find out the cause and have it solved Check the wiring of fan motor No Yes No Correct the connections No No Replace the fan motor Yes Yes Measure the voltage for the fan motor from the main PCB Yes Replace the main PCB No ...

Page 37: ...ease contact the technical engineer Index2 1 Indoor AC Fan Motor Power on and set the unit running in fan mode at high fan speed After running for 15 seconds measure the voltage of pin1 and pin2 If the value of the voltage is less than 100V 208 240V power supply or 50V 115V power supply the PCB must has problems and need to be replaced ...

Page 38: ... of temperature sensors diagnosis and solution Check the connection between temperature sensor and PCB Correct the connection No Yes Replace indoor or outdoor main PCB Measure the resistance value of the sensor Repalce the sensor No Yes ...

Page 39: ...ol air blowing out from indoor air outlet Yes Yes Check if T2 sensor No Check leakage of system No Power off then restart the unit 2 minutes later Replace indoor PCB Yes Repair the leakage and recharge the refrigerant Yes check blockIng of system and clear the blocking ...

Page 40: ...ain PCB Power on Is the error extinguished Replace the outdoor main PCB Power on Is the error extinguished Check the outdoor wiring connection Check the outdoor wiring connection Replace the indoor main PCB Power on Is the error extinguished Replace the indoor main PCB Power on Is the error extinguished Yes Replace the outdoor main PCB Replace the outdoor main PCB No Replace the indoor main PCB Re...

Page 41: ... Compressor discharge temp T5 sensor Measure the resistance value of each winding by using the multi meter Table1 Some frequently used R T data for T1 T2 T3 and T4 sensor Temperature 5 10 15 20 25 30 40 50 60 Resistance Value KΩ 26 9 20 7 16 1 12 6 10 8 5 2 3 5 2 4 Table2 Some frequently used R T data for T5 sensor Temperature 5 15 25 35 60 70 80 90 100 Resistance Value KΩ 141 6 88 56 1 36 6 13 8 ...

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