63
Installation and Maintenance
Service Manual
11. AC overcurrent protection
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Start
The power voltage is unstable.
The normal fluctuation is about 10% of rated
voltage on the nameplate.
The power voltage is too low and the
load is too high.
Adjust the power voltage to make it normal.
Check whether
indoor or outdoor heat exchanger is
too dirty or the air inlet and the air
outlet is blocked.
Clean the outdoor and indoor heat exchangers to
eliminate the blockage of air inlet and air outlet.
Check whether
the fan motor can operate. The fan operates
abnormally; fan speed is too lower the the
fan can't operate.
Check the motor and install the motor again to
let the fan operate normally
Solve the operation problem of compressor
Check whether the
compressor operates normal; whether there's
abnormal sound, oil leakage and high
temperature for the case, etc.
System is blocked
(check the capillary and filter,
or if the cut off valve is
frosted).
Replace the blockage component
Check the system
Replace the control board
End
Use the ampere meter
to measure the current of live wire of main board.
Check whether the current is more than
the overcurrent protection
value.
Eliminate malfunction
Eliminate malfunction
Eliminate malfunction
Eliminate malfunction
Eliminate malfunction
Eliminate malfunction
Eliminate malfunction
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