Thermo King SPECTRUM TS 30 SR NAD, Manual

Page: 165 / 196

165
Refrigeration Diagnosis
Ra
pi
d
c
y
c
lin
g be
tw
ee
n Co
ol
an
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eat
U
n
it
co
ols
in
He
at
a
n
d
D
e
fr
o
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t c
ycle
U
n
it
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ts
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fr
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ycle
Hi
g
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ad p
res
s
u
re
Low
he
ad p
res
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re
N
o
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ad
p
re
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Hi
g
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u
c
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es
su
re
Low
s
u
c
ti
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es
su
re
N
o
suc
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su
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Un
it
o
per
at
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g
i
n
a
va
cu
um
Re
ce
iv
er s
igh
t gl
a
s
s
emp
ty
S
u
ct
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l
in
e
fr
ost
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b
a
c
k
Un
ab
le
to
p
u
mp
d
o
w
n
s
y
s
tem
U
n
a
b
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t
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ll
va
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m
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lo
w
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U
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id
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N
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is
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o
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p
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r
U
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ra
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de
fr
os
ti
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Sy
mptom
Possible Causes
• • • • Overcharge of refrigerant
• • • • • • Shortage of refrigerant
• • • • • No refrigerant
• Air through condenser too hot (ambient)
• Air flow through condenser restricted
• • • Air through condenser too cold (ambient)
• • • Air in refrigerant system
• Condenser fan blades bent or broken
• Air short cycling around evaporator coil
• Air through evaporator restricted
• • • • Evaporator needs defrosting
• Compressor discharge valves leaking
• • Scroll compressor seals leaking
• Too much compressor oil in system
• Faulty oil pump in compressor
• Loose compressor pulley
• Compressor bearing loose or burned out
• • • • • Broken discharge check valve in compressor
• • Expansion valve power element lost its charge