109
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 088669
Page 4: ......
Page 8: ......
Page 12: ...Safety Precautions Rev 04 03 iv PUB126...
Page 13: ...Safety Precautions Rev 04 03 v aea105...
Page 14: ......
Page 28: ...Unit Description Rev 04 03 14 Rear View Curbside RD II SR Evaporator aea105...
Page 32: ...Unit Description Rev 04 03 18 Power Receptacle Box RD II SR 50 aea102...
Page 76: ...Refrigeration Maintenance Rev 04 03 62...
Page 77: ...Refrigeration Maintenance Rev 04 03 63...
Page 81: ...Refrigeration Maintenance Rev 04 03 67...
Page 103: ...89 Hilliard Clutch Maintenance Clutch Assembly...
Page 106: ...Hilliard Clutch Maintenance Rev 04 03 92 12 Install retaining ring Clutch Torque Values...
Page 125: ...111 Cool Cycle RD II SR with TherMax Heating...
Page 126: ...112 Condenser Cycle RD II SR with TherMax Heating...
Page 127: ...113 Heat and Defrost Cycle RD II SR with TherMax Heating...
Page 129: ...115...
Page 130: ...116...
Page 131: ...117...
Page 132: ...118...
Page 133: ...119...
Page 134: ...120...
Page 135: ...121...
Page 136: ...122...