55
Installation and Maintenance
Service Manual
4.
Overload protection of compressor , high discharge temperature, protection of compressor
Main check points:
(1) electronic expansion valve (2) expansion valve terminal
(3) charging amount of refrigerant (4) overload protector
NOTE:The control board as below means the control board of outdoor unit.
Y
N
N
N
N
Y
Y
N
Y
Y
After the unit has been
cut off the power for more
than 20mins
Check whether the
overload protector SAT is connected.
Connect the wires well
according to the wiring
diagram.
Under the ambient temperature,
use the ohmmeter to measure the resistance of
overload protector. Is the resistance
less than 1000ohm?
Check whether the wiring
terminal FA of electronic expansion valve is
connected well.
Replace overload protector SAT.
The resistance between the first four leading
feet closing to the terminal hole and the fifth
leading feet are almost the same respectively
and they are all less than 100ohm.
Replace the coil of electronic
expansion valve EKV.
Eliminate malfunction
Check whether the refrigerant is
leaking; if yes, please charge the
refrigerant according to the
technical specification.
Eliminate malfunction
Replace control board
End
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