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151
Refrigeration Diagnosis
Rapi
d c
y
c
lin
g
be
twee
n c
ool
an
d he
at
Uni
t c
ool
s i
n
h
eat
and
def
ro
st
cy
cl
e
U
n
it
he
at
s
in
re
fr
ige
ra
tio
n c
y
c
le
Hig
h
he
ad p
ress
u
re
Low hea
d
pr
es
s
u
re
No h
ead
pr
es
su
re
H
igh
su
ct
io
n
p
re
ssu
re
Low su
cti
on pr
es
su
re
N
o
su
ct
io
n
pr
es
su
re
Uni
t op
er
ati
ng i
n
a
va
cu
um
Rec
e
iv
e
r s
ight g
la
s
s
em
pty
Su
cti
on li
ne
fr
o
s
ti
ng bac
k
Unab
le
to p
u
mp
dow
n s
y
s
tem
U
nab
le
to p
u
ll v
a
c
uum
in
lo
w
s
ide
U
nab
le
to h
o
ld
v
a
c
uum
in
low
si
de
N
o
is
y co
m
p
re
s
s
o
r
Uni
t no
t r
e
fr
ig
er
ati
n
g
Uni
t no
t hea
tin
g
o
r d
e
fr
os
ti
ng
SY
MP
TOM
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
•
•
Compressor suction valves leaking
•
Too much compressor oil in system
•
Faulty oil pump in compressor
•
Loose compressor pulley
•
Compressor bearing loose or burned out
•
• • • •
Broken valve plate in compressor
•
•
Expansion valve power element lost its charge
•
•
Expansion valve feeler bulb improperly mounted
Summary of Contents for KD-II SR
Page 4: ......
Page 8: ......
Page 13: ...Safety Precautions Rev 04 03 v AEA40...
Page 14: ...Safety Precautions Rev 04 03 vi AEA38...
Page 33: ...Unit Description Rev 04 03 19 1 Evaporator 2 Access Door Rear View Curbside KD II SR 1 2 AEA38...
Page 37: ...Unit Description Rev 04 03 23 Power Receptacle Box KD II SR 50 AEA42...
Page 58: ...Remote Control Panel Features Rev 04 03 44...
Page 112: ...Refrigeration Maintenance Rev 04 03 98...
Page 120: ...106...
Page 146: ...132...
Page 156: ...142...
Page 162: ...148...
Page 170: ...156...
Page 172: ...158...
Page 173: ...159 KD II 30 Schematic Diagram Page 1 of 2...
Page 174: ...160 KD II 30 Schematic Diagram Page 2 of 2...
Page 175: ...161 KD II 30 Wiring Diagram Page 1 of 2...
Page 176: ...162 KD II 30 Wiring Diagram Page 2 of 2...
Page 177: ...163 KD II 50 Schematic Diagram Page 1 of 2...
Page 178: ...164 KD II 50 Schematic Diagram Page 2 of 2...
Page 179: ...165 KD II 50 Wiring Diagram Page 1 of 2...
Page 180: ...166 KD II 50 Wiring Diagram Page 2 of 2...
Page 181: ...167 KD II 50 SR 230 1 60 Wiring Diagram Page 1 of 2...
Page 182: ...168 KD II 50 SR 230 1 60 Wiring Diagram Page 2 of 2...