Thermo King Spectrum DE 30-2, Manual, Page: 112 / 140

Refrigeration Diagnosis
112
• Suction service valve back seated
• • • • • • • Faulty CIS
• • • • • Faulty HGS
• • Loose or broken electrical connections
• • • • • Sensor out of calibration
• • • • Compound pressure gauge out of calibration
• Leaky receiver tank outlet valve
• • • • • Leaky check valve
• • • • Faulty check valve
• Leaky receiver tank pressure solenoid (RTPS)
• • Closed receiver tank pressure solenoid (RTPS)
• • • • Leaky hot gas solenoid (HGS)
• • Closed hot gas solenoid (HGS)
• • • Leaky liquid line solenoid (LLS)
• • • • • • Closed liquid line solenoid (LLS)
• Leaky liquid return check vale (LRCV)
• • Leaky suction line solenoid (SLS)
• • • Leaky suction line check valve (SLCV)
• • Leaky Zone 2 or 3 hot gas solenoid (HGS2 or 3)
• • • • Closed Zone 2 or 3 hot gas solenoid (HGS2 or 3)
• • Leaky Zone 2 or 3 liquid line solenoid (LLS2 or 3)
• • • Closed Zone 2 or 3 liquid line solenoid (LLS2 or 3)
• Leaky Zone 2 or 3 liquid return check valve
(LRCV2 or 3)
• • Leaky Zone 2 or 3 suction line solenoid (SLS2 or 3)
• • • Leaky Zone 2 or 3 suction line check valve
(SLCV2 or 3)
• • • • Leaky purge valve (PV)
R
a
pi
d
cyc
li
ng
be
tw
een
C
ool
and
H
e
a
t
Un
it
cool
s i
n
He
at
a
nd De
fro
s
t
c
ycl
e
Un
it
heat
s
i
n
Re
fr
ige
rat
ion cyc
le
H
igh
he
ad
pre
s
s
u
re
Low
he
ad
pre
s
s
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re
No
h
ead
pr
ess
ure
Hi
gh
s
u
ct
io
n p
res
sure
Low
s
u
ct
io
n p
res
sure
No
s
u
ct
io
n
pres
sure
U
n
it
opera
ti
ng i
n
a va
cuum
Re
ce
iv
er si
ght
gl
ass
e
m
pty
Suct
io
n
li
n
e f
rost
ing bac
k
Un
abl
e
to
p
u
mp d
o
wn
sy
st
em
U
n
a
b
le
t
o
pu
ll
v
a
c
u
u
m
in
l
o
w
sid
e
U
n
a
b
le
t
o
ho
ld
va
c
u
u
m
in
lo
w
s
id
e
No
is
y compr
ess
or
U
n
it
n
o
t r
e
fr
ig
er
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ti
n
g
U
n
it
not he
at
ing
or
d
e
fr
ost
in
g
Sy
m
p
tom
Possible Causes