Table of Contents
Advertisement
XVII. TROUBLESHOOTING
FIGURE 40
WARNING
!
DISCONNECT ALL POWER TO UNIT BEFORE SERVICING. CONTACTOR MAY BREAK ONLY ONE SIDE. FAILURE
TO SHUT OFF POWER CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL INJURY OR DEATH.
S
Y
M
P
T
O
M
Unit will not run
Condenser fan runs, compressor
doesn't
n I
s
f u
c i f
e i
t n
c
o
o
n i l
g
C
o
m
p
e r
s s
r o
s
h
o
t r
c
c y
e l
s
R
e
g
s i
e t
s r
s
w
e
t a
High head-low vapor pressures
H
g i
h
h
e
a
d
h -
g i
h
r o
n
r o
m
a
v l
a
p
r o
p
e r
s s
u
e r
-
C
o
o
n i l
g
m
o
d
e
L
o
w
h
e
a
d
h -
g i
h
v
a
p
r o
p
e r
s s
u
e r
s
L
o
w
v
a
p
o
- r
c
o
o
c l
o
m
p
e r
s s
o
- r
iced evaporator coil
H
g i
h
v
a
p
r o
p
e r
s s
u
e r
F
u l
c
u t
t a
n i
g
h
e
a
d
&
v
a
p
r o
pressures
G
u
g r
e l
r o
p
u
s l
n i
g
n
o
s i
e
t a
expansion device or liquid line
Circulating air blower & inducer
run continuously,
c
o
m
p
e r
s s
r o
w
l l i
n
t o
s
a t
t r
COOLING TROUBLE SHOOTING CHART
P
O
S
S
B I
L
E
C
• Power off or loose electrical connection
• Thermostat out of calibration-set too high
•
F
a
e l i
d
c
o
n
a t
t c
r o
•
B
o l
w
n
u f
s
e
s
•
T
a r
n
f s
r o
m
r e
d
e
e f
c
v i t
e
• High pressure control open (if provided)
• Interconnecting low voltage wiring damaged
• Run or start capacitor failed (single phase only)
• Start relay defective 9single phase only)
•
L
o
o
s
e
c
o
n
n
e
t c
o i
n
• Compressor stuck, grounded or open motor winding
o
p
e
n
n i
e t
n r
l a
o
v
r e
o l
a
. d
•
L
o
w
v
l o
a t
g
e
c
o
n
d
t i
o i
n
•
L
o
w
v
l o
a t
g
e
c
o
n
d
t i
o i
n
•
I
m
p
o r
p
r e
y l
s
z i
e
d
u
n
t i
•
I
m
p
o r
p
r e
a
f r i
o l
w
•
n I
c
r o
e r
t c
e r
r f
g i
e
a r
t n
c
h
a
g r
e
• Air, non-condensibles or moisture in system
•
n I
c
r o
e r
t c
v
l o
a t
g
e
•
n I
c
r o
e r
t c
v
l o
a t
g
e
•
D
e
e f
c
v i t
e
o
v
r e
o l
a
d
p
o r
e t
t c
r o
•
R
e
r f
g i
e
a r
t n
u
n
d
e
c r
h
a
g r
e
•
L
o
w
e
v
a
p
r o
t a
r o
a
f r i
o l
w
• Restriction in liquid line, expansion device or filter drier
•
F
o l
w
c
h
e
k c
p
s i
o t
n
s
z i
e
o t
o
s
m
•
n I
c
r o
e r
t c
c
a
i p
a l l
y r
u t
b
e
s
•
T
X
V
d
o
e
s
n
t o
o
p
e
n
•
D
r i
y t
c
o
n
d
e
n
s
r e
c
l i o
•
R
e
r f
g i
e
a r
t n
o
v
e
c r
h
a
g r
e
•
C
o
n
d
e
n
s
r e
a f
n
n
t o
u r
n
n
n i
g
•
A
r i
r o
n
o
n
c -
o
n
d
e
n
s
b i
e l
s
n i
s
s y
•
D
e
e f
c
v i t
e
C
o
m
p
e r
s s
r o
v
a
v l
e
s
•
n I
c
r o
e r
t c
c
a
i p
a l l
y r
u t
b
e
s
•
L
o
w
e
v
a
p
r o
t a
r o
a
f r i
o l
w
•
O
p
r e
t a
n i
g
b
e
o l
w
6
5
F °
o
u
d t
o
o
•
M
o
s i
u t
e r
n i
s
s y
e t
m
•
E
c x
e
s s
v i
e
o l
a
d
•
D
e
e f
c
v i t
e
c
o
m
p
e r
s s
r o
•
T
X
V
h
u
t n
n i
g
•
A
r i
r o
n
o
n
c -
o
n
d
e
n
s
b i
e l
s
n i
s
s y
•
A
r i
r o
n
o
n
c -
o
n
d
e
n
s
b i
e l
s
n i
s
s y
• Manual reset overtemperature control
• tripped
•
W
i
e r
o l
o
s
e
n i
i l
m
t i
i c
c r
u
t i
A
U
S
E
•
Check for correct voltage at compressor contactor in control
box
•
Reset
•
C
h
e
open
•
R
e
p
•
C
h
e
•
Reset-also see high head pressure remedy-The high pressure
control opens at 610 PSIG
•
Replace thermostat wiring
•
Replace
•
Replace
•
C
h
e
check & tighten all connections
•
Wait at least 2 hours for overload to reset.
f I
s
l l i t
t A
c
o
plate volts when unit is operating.
•
A
d
d
•
R
e
c
a
•
C
h
e
•
C
h
a
•
Recover refrigerant, evacuate & recharge, add filter drier
•
t A
c
o
plate volts when unit is operating.
•
t A
c
o
nameplate marking when unit is operating.
•
R
e
p
•
A
d
d
•
n I
c
e r
filter
•
Remove or replace defective component
l l a
•
C
h
a
•
C
h
a
•
R
e
p
•
C
e l
a
•
C
r o
e r
•
R
e
p
e t
m
•
R
e
c
o
•
R
e
p
•
R
e
p
•
n I
c
e r
filter
s r
•
A
d
d
•
R
e
c
o
•
R
e
c
h
•
R
e
p
•
C
h
e
TXV
e t
m
•
R
e
c
o
e t
m
•
R
e
c
o
•
Reset or replace
•
C
h
e
R
E
M
E
D
Y
k c
f
r o
2
4
v
o
s t l
t a
c
o
n
a t
t c
r o
c
i o
- l
e r
p
a l
a l
c
e
u f
s
e
s
k c
w
r i
n i
- g
e r
p
a l
c
e
t
a r
n
f s
r o
m
r e
k c
f
r o
c
r o
e r
t c
v
l o
a t
g
e
t a
c
o
m
p
e r
s s
o
- r
o
p
e
, n
e r
p
a l
c
e
h t
e
c
o
m
p
e r
s s
o
. r
m
p
e r
s s
o
t r
r e
m
n i
a
, s l
v
l o
a t
g
e
m
u
t s
b
e
s
a t
t r
t i k
c
o
m
p
o
n
e
n
s t
c l
u
a l
e t
o l
a
d
k c
-
s
h
o
u
d l
b
e
a
p
p
o r
i x
m
a
e t
y l
4
0
0
C
F
M
g r
e
p
r e
p
o r
c
e
d
u
e r
t a
a t
c
h
e
d
o t
u
n
t i
s
e
v r
m
p
e r
s s
o
t r
r e
m
n i
a
, s l
v
l o
a t
g
e
m
u
t s
b
e
m
p
e r
s s
o
t r
r e
m
n i
a
, s l
v
l o
a t
g
e
m
u
t s
b
e
a l
c
e
-
c
h
e
k c
f
r o
c
r o
e r
t c
v
l o
a t
g
e
e r
r f
g i
e
a r
t n
a
s
e
s
p
e
e
d
f o
b
o l
w
r e
r o
e r
d
u
c
e
e r
s
r t
t c i
n
g
e
o t
c
r o
e r
t c
s
z i
e
p
s i
o t
n
n
g
e
c
l i o
a
s s
e
m
b
y l
a l
c
e
T
X
V
n
c
l i o
t c
s
s y
e t
m
c
h
a
g r
e
a
r i
r o
e r
p
a l
c
e
v
r e
e r
r f
g i
e
a r
n
, t
e
v
a
c
u
a
e t
&
e r
c
h
a
g r
e
a l
c
e
c
o
m
p
e r
s s
r o
a l
c
e
c
l i o
a
s s
e
m
b
y l
a
s
e
s
p
e
e
d
f o
b
o l
w
r e
r o
e r
d
u
c
e
e r
s
r t
t c i
L
o
w
A
m
b
e i
t n
K
t i
v
r e
e r
r f
g i
e
a r
n
- t
e
v
a
c
u
a
e t
&
e r
c
h
a
g r
e
e
k c
o l
a
d
c
a
c l
l u
t a
o i
n
a l
c
e
k c
T
X
V
b
u
b l
c
a l
m
p
-
c
h
e
k c
a
r i
d
s i
r t
b i
t u
v
r e
e r
r f
g i
e
a r
n
, t
e
v
a
c
u
a
e t
&
e r
c
h
a
g r
e
v
r e
e r
r f
g i
e
a r
n
, t
e
v
a
c
u
a
e t
&
e r
c
h
a
g r
e
k c
w
r i
n i
g
c
e
f i
c
o
n
a t
c
s t
a
e r
i w
h t
n i
1
0
%
o
r f
t a
n i
g
p
r e
o t
. n
c i
e
p
a
n
e
. l
i w
h t
n i
1
0
%
o
r f
t a
n i
g
±
1
0
%
f o
o i
n
-
e r
p
a l
c
e
a
r i
o i
n
-
e r
p
a l
c
e
a
r i
-
a
d
d
t l i f
r e
d
i r
r e
o i
n
o
n
c
i o
- l
e r
p
a l
c
e
57
Advertisement
Table of Contents
