42
Installation and Maintenance
Service Manual
11. Overload Protection Compressor H3
Main detection points:
● Heat exchange of unit is not good? (heat exchanger is dirty and unit radiating environment is bad)
● Fan motor is not working?
● Too much load of the system causes high temperature of compressor after working for a long time?
● Whether high pressure switch is normal?
● If the refrigerant is leaked?
Malfunction diagnosis process:
Start
Outdoor and indoor heat
exchangers are too dirty or the air
inlet/outlet is blocked.
Clean the outdoor and indoor heat exchangers
and remove blockage of air inlet/outlet.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Malfunction is
eliminated.
Check motor and re-install the motor to
make it run normally.
Make compressor run normally.
Remove blockage in the system.
Replace high pressure switch
Check the leaking status of refrigerant
and charge refrigerant
Fan motor is not working.
Abnormal fan speed; fan speed is too
low or the fan doesn't run.
Compressor doesn't work
normally. Strange noise or leakage occurs.
Temperature of the shell is too high.
System is blocked inside
(dirt block, ice block, oil block, Y-valve not
fully open).
Check whether high
pressure switch is normal
Check whether the
refrigerant is leaking and cause
overheating protection to compressor
Replace a main
board of the
same model.
End
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
