77
Installation and Maintenance
Service Manual
6. Overload protection of compressor H3, high discharge temperature protection of compressor E4
(AP1 hereinafter refers to the control board of the outdoor unit)
Main detection points:
(1) electronic expansion valve (2) expansion valve terminal (3) charging amount of refrigerant (4) overload protector
Malfunction diagnosis process:
After the unit
de-energized
for 20min
N
N
N
Y
N
N
Replace
control board
AP1
End
Remove
malfunction?
Check refrigerant, if there is
leakage, please refer to
specication
Remove
malfunction?
Replace
overload
protector SAT
Replace EKV
coil of electron
expansion valve
The resistance value of
rst 4 lead foot and the
fth lead foot is similar, less
than 100Ω
Connect wire
well with wiring
diagram
If the wiring terminal FA of electron
expansion is well connected?
Under ambient temperature, test the
resistance of overload protector with
ohmic meter resistance value 1000Ω
If the overload protector SAT
iswell connected?
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