Ac Overcurrent Protection - Toyotomi KURO Mini Service Manual

11. AC overcurrent protection

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