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9.2 Diagnosis and Solution

9.2.1 Indoor fan speed out of control diagnosis

Is the indoor fan motor connector and
connection good?

The unit does not work normally

Turn off the unit, rotate the cross
fan. Does it rotate freely?

Disassemble the connection between
fan and motor, check if the bearing is
normal. If not, change the bearing. If
yes, follow the below step.

Replace the fan motor

Yes

Replace the indoor PCB

Yes

Is the voltage being applied to the fan
motor?

Yes

Shut off the power supply and turn on it 5s later

Содержание MTN-MTG A128FS

Страница 1: ...Service Manual MODEL MTN MTG A128FS MTN MTG A135FS...

Страница 2: ...6 3 Pipe length and the elevation 26 6 4 Installation for the first time 27 6 5 Adding the refrigerant after running the system for many years 30 6 6 Re installation while the indoor unit need to be r...

Страница 3: ...le or repair 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...

Страница 4: ...uring operation There is risk of fire or electric shock Do not place anything on the power cable There is risk of fire or electric shock Do not plug or unplug the power supply plug during operation Th...

Страница 5: ...ion that water could not enter the product There is risk of fire electric shock or product damage Ventilate the product from time to time when operating it together with a stove etc There is risk of f...

Страница 6: ...preserving foods works of art etc It is a consumer air conditioner not a precision refrigerant system There is risk of damage or loss of property Do not block the inlet or outlet of air flow It may ca...

Страница 7: ...es of the same type Do not mix old and mew batteries or different types of batteries There is risk of fire or explosion Do not recharge or disassemble the batteries Do not dispose of batteries in a fi...

Страница 8: ...vent the water being frozen on evaporator by sensing the evaporator pipe temperature in cooling mode Room temperature sensor Pipe temperature sensor Indoor units Operation by remote controller Sensing...

Страница 9: ...he valves and prevents water from dripping Outdoor units Power relay control Valve protection cover Made from electrolytic zinc steel sheet and anti rust coated components Low noise air flow system An...

Страница 10: ...9 3 Dimension 3 1 Indoor Units Figure 1 e 2 Figure Models W H D Figure 1 MTN A128FS 710 250 189 Figure 2 MTN A135FS 790 275 196...

Страница 11: ...tdoor Units More than 30cm More than 60cm More than 70cm More than 30cm More than 60cm Service space Fence or obstacles Model W D H W1 A B MTG A128FS 700 780 240 250 540 540 757 843 458 549 250 276 MT...

Страница 12: ...12 4 Refrigerant Cycle Diagram Heating pump mode...

Страница 13: ...13 5 Wiring Diagram 5 1 Indoor Units MTN A135FS MTN A128FS...

Страница 14: ...17 5 2 Outdoor Units MTN A128FS MTN A135FS...

Страница 15: ...00 479kgf cm 6 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...

Страница 16: ...nt of refrigerant All Less than 5m Use vacuum pump 9k 12k More than 5m Use vacuum pump Pipe length 5 20g m Model Standard length m Max Elevation B m Max Length A m 9k 12k 5 8 20 Caution Capacity test...

Страница 17: ...ft 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 1 Completely tighten the flare nuts of the indoor and out...

Страница 18: ...indicator is a little higher than the atmosphere pressure Then remove the charge hose from the 3 way valve 8 Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve...

Страница 19: ...rant if the pipe length 5m Procedure 1 Connect the charge hose to the charging cylinder open the 2 way valve and the 3 way valve Connect the charge hose which you disconnected from the vacuum pump to...

Страница 20: ...nnect the charge hose to the 3 way service port open the 2 way valve and the 3 way valve Connect the charge hose to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinde...

Страница 21: ...e the indoor unit need to be repaired 1 Collecting the refrigerant into the outdoor unit Procedure 1 Confirm that both the 2 way and 3 way valves are set to the opened position Remove the valve stem c...

Страница 22: ...by the refrigerant Procedure 1 Confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve Leav...

Страница 23: ...tighten the service port cap to a torque 18N m Be sure to check the gas leakage 6 7 Re installation while the outdoor unit need to be repaired 1 Evacuation for the whole system Procedure 1 Confirm th...

Страница 24: ...le 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 ch...

Страница 25: ...43 For the models with low temperature cooling system 18 43 21000Btu h models 21 52 For special tropical models 21 52 For special tropical models CAUTION 1 If air conditioner is used beyond the above...

Страница 26: ...lanation on indoor display board Auto indicator This indicator illuminates when the air conditioner is in AUTO operation Timer indicator This indicator illuminates when TIMER is set ON OFF PRE DEF Ind...

Страница 27: ...xceeds I5min for 5 minutes the compressor and outdoor fan will shut off C zone The current exceeds IFAN the outdoor fan will shut off if AC is in heating mode If AC is in cooling mode the indoor fan w...

Страница 28: ...38...

Страница 29: ...up Tm Ts 1 Tn Ts Tm Ts Tn Ts 2 8 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...

Страница 30: ...d outdoor fan will shut off When T1 is lower than Tk the compressor and outdoor fan will start up Tj Ts Tc Tk Ts Tc 1 Tc 1 for 7k 8 4 3 2 Outdoor fan running rules The outdoor units have single fan sp...

Страница 31: ...MTN A135FSmodel Auto fan action When T1 Ts 2 the indoor fan will run at low speed When T1 Ts 0 the indoor fan will run at medium speed 8 4 3 4 High evaporator coil temp T2 protection Model T2 TE7 TE8...

Страница 32: ...e T2 T1 High speed THDEFROST Medium speed TMDEFROST Low speed TLDEFROST Breeze off No need to compare the T2 and T1 model THDEFROST TMDEFROST TMDEFROST MTN A128FS 14 15 16 MTN A135FS 14 15 16 2 After...

Страница 33: ...time is 10 minutes Otherwise the defrosting time is 7 5 minutes 2 Condition 2 of defrosting The defrosting time is 10 minutes 3 No matter what condition of defrosting is if the defrosting time keeps 7...

Страница 34: ...ed start defrosting Condition 2 If the accumulated time of outdoor fan stopped but the compressor keep working due to evaporator high temperature protection mode reaches 90 min from the end of last de...

Страница 35: ...n only T 1 Heating for cooling only models they will run at fan only mode AC will run in auto mode in the below cases 1 Press the forced auto button 2 If AC is off it will run in auto mode when timer...

Страница 36: ...door fan keep running and the indoor fan runs at low speed After running for 30 minutes AC will turn to drying mode with 24 setting temperature Forced auto mode The action of forced auto mode is the s...

Страница 37: ...r the setting temperature stops rising and indoor fan is fixed as low speed Anti cold wind function has the priority 8 4 8 3 Timer setting is available 8 4 8 4 When user uses timer off function in sle...

Страница 38: ...controlled by remote controller Ionizer will be turned off automatically if indoor fan stops running due to malfunctions or anti cold wind When indoor fan restarts after malfunctions being eliminated...

Страница 39: ...isplay Operation lamp Timer lamp Failure X Indoor fan speed has been out of control O The T1 or T2 sensor is open circuit or short circuit X Over current protection occurs 4 times O EEPROM error Zero...

Страница 40: ...ally Turn off the unit rotate the cross fan Does it rotate freely No Disassemble the connection between fan and motor check if the bearing is normal If not change the bearing If yes follow the below s...

Страница 41: ...ure sensor diagnosis and solution 9 2 3 Over current protection occurs 4 times Yes Replace outdoor PCB Yes Check the connections between the sensors and the PCB Are the connections good Replace the se...

Страница 42: ...tion error When such failure occurs the main control board must have fault Replace indoor PCB Shut off the power supply and turn on it 5s later The problem comes out again Is the EEPROM chip plugged i...

Страница 43: ...e connection of L N S and GND good No Is the LED4 red bright and LED1 yellow blinking on outdoor PCB The power supply for outdoor PCB is fail Check the wiring on outdoor PCB comparing with wiring plat...

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