Toyotomi MTN-MTG A128FS Service Manual Download

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9. Troubleshooting

9.1 Indoor unit error display

Operation lamp

Timer lamp

Failure

Indoor fan speed has been out of control

The T1 or T2 sensor is open circuit or short circuit

Over current protection occurs 4 times.

EEPROM

error

Zero crossing detection error

（

light

）

（

off

）

（

flash

）

Summary of Contents for MTN-MTG A128FS

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

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

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 28: ...38...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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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