Great Wall hover - Insufficient Refrigeration Output

CD Player and Air Conditioning System-11
b .Insufficient refrigeration output
Trouble Descriptions Analysis of the Cause
Inadequate
refrigeratio
n
1. wind amount
is normal
1. compressor works normall
y
(1) low-level pressure at high-pressure and low-pressure side
s
a. block of expansion valv
e
b. openness of expansion valve too narro
w
(2) high-level pressure at high-pressure and low-pressure side
s
a. failure to high-voltage pip
eline, flow not smooth
b. malfunction of thermo resisto
r
c. op
enness of expansion valve too wide
d. too much refrigeration oi
l
e. too much refrigerant
f. poor heat dissipation of the condense
r
(3) pressure at high-voltage side too lo
w
a. low-pr
essure pipeline damaged
b. block of low-pressure pipelin
e
(4)pressure at low-pr
essure side too low
a. the evaporator frosted
b. block of expansion valv
e
c. low-pr
essure pipeline not smooth
d. malfunction of thermo resisto
r
(5)pressure at low-pr
essure side sometime normal, sometimes with negative pressure,
moisture and ice block in air cooling syste
m
(6)negative pressure at low-pressure side, pressure at high-pressure side too low, block of ai
r
cooling syste
m
(7)pressure at low-pr
essure side too low, pressure at high-pressure side too high
a. internal block of drier of fluid reservoir
b. block of high-pressure pipelin
e
(8)pressure at low-pr
essure side too high, pressure at high-pressure sidetoo low
a. leakage of the compresso
r
b. damaged valve of compresso
r
(9)poor heat radiation of condenser due to small windamount fromthe condensing blower
2. compressor works improperl
y
(1)internal malfunction of compressor
(2)belt of compr
essor too loose or sliding
(3)failure of electromagnetic clutc
h
a. low voltage of power suppl
y
b. mutual interference of the stator and roto
r
c. malfunction of amplifier stabilizing the idle speed
d. circuit disconnected, coming off of the joints
e. poor operation of the switchand relay
f. short circuit and open circuit of the routing
g. poor earthing
3. other cause
s
bad sealing of wagon