Thermo King 914970, Руководство пользователя

Страница: 156 / 186

Refrigeration Diagnosis
156
• • • Expansion valve feeler bulb making poor contact
• • Expansion valve open too much
• • Expansion valve closed too much
• • Expansion valve needle eroded or leaking
• • • Expansion valve partially closed by ice, dirt or wax
• • • Liquid refrigerant entering compressor
• • Restricted line on the low side
• • • • Restricted line on the high side
• • • • Restricted drier
• Evaporator shutter open
• • • Evaporator shutter stuck closed
• Suction service valve back seated
• • • • • • • Faulty CIS
• • • • • Faulty Hot Gas Solenoid
• • Loose or broken electrical connections
• • • • • Thermostat or thermometer out of calibration
• • • • Suction pressure gauge out of calibration
• Leaky receiver tank outlet valve
• • DPR Valve Faulty
R
api
d
c
y
c
ling be
tw
e
en C
o
o
l
a
nd H
e
a
t
Un
it co
o
ls in
He
a
t
a
n
d
De
fr
o
s
t
c
ycle
Un
it
h
e
a
ts in
R
e
fr
ig
e
ra
tio
n
cy
cle
H
igh he
ad
p
re
s
s
u
re
Lo
w he
ad
p
re
s
s
u
re
N
o
hea
d pr
es
s
u
re
H
igh s
u
c
ti
on pr
es
s
u
re
Lo
w s
u
c
ti
on pr
es
s
u
re
N
o
su
ct
io
n pr
es
su
re
U
n
it
o
p
e
rat
in
g i
n
a va
c
uum
R
e
c
e
iv
er
s
igh
t g
las
s
em
pt
y
S
u
c
ti
on l
in
e
fr
os
ti
n
g
ba
ck
U
nab
le
t
o
pum
p do
wn
s
y
s
te
m
Un
a
b
le
to
p
u
ll va
cu
u
m
in
lo
w
sid
e
Un
a
b
le
to
h
o
ld
v
a
c
u
u
m
in
lo
w s
id
e
No
isy
co
m
p
re
s
s
o
r
Un
it n
o
t
re
fr
ig
e
ra
tin
g
U
n
it
n
o
t hea
ti
n
g
or
def
ro
s
ti
n
g
Sy
mpto
m
Possible Causes