Shini SIC-A-R2 - 5. The high pressure is too low; 6. The low pressure is too low; 7. The low pressure is too high; 8. Compressor overheat

88(96)
Faults
The action od the
protection units
The possible fault
analysis
Solutions
5. The high
pressure is
too low
The protection units
have no action
A. The regrigerant is not
enough.
B. The vanes of the
compressor are spoiled
C. Ambient temperatute is
too low
A. Check the system pipeline
and weld pipeline, add
refrigerant.
B. Replace after checked and
repaired.
C. Ward off part of the
condenser to ensure high
pressure above 27bar.
6. The low
pressure is
too low
The low pressure
switch trips
A. The refrigerant is not
enough
B. The dry filter is blocked
up
C. The open scale of the
expansion valve is too
small
D. The fault of the
expansion valve
E. The fault of the low
pressure switch
A. Check the system pipe
lines, weld pipelines, and
supply refrigerant.
B. Clean the dry filter
C. Adjust the open scale
properly
D. Replace after checked and
repaired
E. Replace after checked and
repaired
7. The low
pressure is
too high
The protection units
have no action
A. The cooling load is too
big
B. The power of the
compressor decreases
C. The open scale of the
expansion valve is too
big
D. The packed weight of
the refrigerant is
excessive
A. Adjust the cooling load
B. Replace after checked and
repaired
C. Adjust the open scale of the
expansion valve
D. Discharge some of the
refrigerant
8. Compressor
overheat
The protection units
have no action
A. The heat degree of the
refrigerant in the air
return pipe is too high
B. The high pressure is too
high
C. The low pressure is too
low
A. Adjust the open scale of the
expansion valve properly
B. Check, repair and improve
C. Check, repair and improve