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Have a focus inspection on the following area:
a. Each pipe union joint and valve connection.
b. All hose, especially near the pipe union.
c. Compressor shaft seal, front and rear cover, gasket, oil fill plug.
d. Area on the surface of the condenser and evaporator that is scratched, bruised or damaged.
e. Expansion valve inlet and outlet connection and temperature sensor element and the welding position.
3. Check the Refrigerant
Observing from the sight glass, you may understand the refrigerant status and analyze the possible faults:
4. Check Other Parts
Other parts needed to be checked and their check points:
Conditions observe
Possible problems
Clear, no air bubble, A/C emits cool wind Refrigeration system is normal
Clear, no air bubble, A/C emits warm wind Refrigerant leaked, there is leakage in the system
Occational air bubble. Expansion valve is frosted There is water mixed in the refrigeration system
Occational air bubble. Insufficient refrigerant or air mixed in the system
Clear, there is oil stripe on the glass Outlet is not cold, no refrigerant
Foamy and turbid Excessive freezing oil
Checked Par
Check Points
There shall be no dirt and rust on the radiator that hinder the heat
exchange;
The radiator surface has no damage, fissure and hidden trouble that may
cause refrigerant leakage.
Electromagnetic Clutch
Clutch operation is normal. When switched on, the compressor shall
operate, clutch can not slip.
Compressor Belt Belt tension of 250N is normal, belt is not broken and damaged.
Wire
The electromagnetic clutch and blower power cable shall be not damaged
and overheated; the connection shall be reliable, and the protective
grommet through the metal plate shall be kept good and without damage.
Hose
Refrigerant hose and condenser pipe shall be secured and shall not be
damaged by approaching the other overheated parts, moving parts and
sharp parts.
Evaporator Condenser
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