Profroid SUPERCOLD SCH - TROUBLESHOOTING; Examples of Faults and Solutions

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- TROUBLESHOOTING
Examples of faults and solutions
F
A
U
L
T
P
R
OB
A
B
LE
C
A
US
E
A
C
TI
O
N
R
E
Q
U
I
R
ED
1. Suction
Temperature too
h
i
g
h
T
o
o
m
u
c
h
s
u
c
t
i
o
n
g
a
s
s
uper
h
e
a
t
E
xam
i
n
e
an
d
a
dju
s
t
th
e
t
h
e
r
mo
s
tat
ic
e
x
p
an
s
i
o
n
valves in the evaporators.
2
.
S
u
c
t
i
o
n
Temperature too
low
L
iquid
in
th
e
s
u
c
t
i
o
n
l
i
n
e
.
A
dju
s
t
th
e
r
mo
s
t
a
t
ic
e
x
p
a
n
s
i
o
n
va
l
v
e
s
.
Se
n
s
o
r
b
u
l
b
is
l
oo
s
e
o
r
i
n
c
o
r
re
c
t
l
y
p
o
s
i
t
i
on
e
d
.
C
h
e
c
k
if
th
e
b
u
l
b
is
in
c
onta
c
t
w
i
t
h
th
e
s
u
c
t
i
o
n
l
i
n
e
and if it is positioned correctly
3 . Suction
Pressure too low
T
o
o
m
u
c
h
o
il
i
n
e
va
p
o
r
a
t
o
r
s
.
Dr
a
in
o
il
fr
o
m
e
va
p
o
r
a
t
o
r
s
.
F
i
l
t
er
in
th
e
l
iquid
l
i
n
e
cl
o
gg
ed.
E
xam
i
n
e
an
d
cl
e
a
n
fi
l
t
ers
in
l
iquid
l
i
n
e.
Su
c
t
i
o
n
fi
l
t
er
bl
o
c
k
ed.
C
h
e
c
k
i
n
t
a
k
e
fi
l
t
e
r
.
T
o
o
m
u
c
h
s
uper
h
e
a
t
o
f
s
u
c
t
i
o
n
g
a
s
.
A
dju
s
t
th
e
r
mo
s
t
a
t
ic
e
x
p
a
n
s
i
o
n
va
l
v
e
s
.
T
h
er
mo
s
t
a
t
ic
e
x
p
an
s
i
o
n
va
lv
e
bl
o
c
k
ed
w
h
en
in
closed position.
De-ice thermostatic expansion valve using warm
rags. If no improvement, change the thermostatic
expansion valve.
Pr
o
bl
em
w
i
t
h
s
o
l
e
no
id
va
lv
e
i
n
th
e
l
iquid
l
i
n
e
.
C
h
e
c
k
w
iri
n
g
a
n
d
c
o
il
–
rep
l
a
c
e
if
n
e
c
e
ss
a
ry
I
n
s
ta
ll
at
i
o
n
i
n
s
uffi
c
ie
nt
l
y
c
h
a
r
g
ed.
C
ha
r
g
e
th
e
i
n
s
ta
ll
at
i
o
n
w
i
t
h
refri
g
er
an
t
.
4 . Compressor cuts
in and out too
often on LP s a fe t y
switch
See
p
o
i
n
t
3
Lo
w
pre
ss
ure
s
a
fe
t
y
s
w
i
t
c
h
s
et
t
o
o
h
i
g
h
.
A
dju
s
t
pre
ss
ure
s
a
fe
t
y
s
w
i
t
c
h
.
Evaporator iced over or frozen water present in
the distributor.
Clean or defrost evaporator.
5 . Suction
Pre
ss
ure
to
o
h
i
g
h
Re
s
ta
rt
a
f
t
er
defr
o
s
t
.
W
a
i
t
f
o
r
c
o
n
fir
m
a
t
i
o
n
C
om
pre
ss
i
o
n
p
r
o
bl
e
m
s
C
h
e
c
k
va
l
v
es
a
n
d
g
a
s
k
e
t
s
6 . C o nden s er
Pressure too high
I
n
s
uffi
c
ie
n
t
f
l
o
w
o
f
a
ir
i
n
t
o
th
e
c
on
d
e
n
s
er
C
l
e
a
n
t
h
e
c
on
d
e
n
s
er.
C
h
e
c
k
mot
o
r
f
a
n
s
F
a
n
c
ut
in
n
o
t
a
d
ju
s
t
ed
c
o
rr
e
c
t
l
y
A
dju
s
t
High pressure safety valve set too low
Set
pre
ss
ure
v
a
l
v
e
a
t
m
ax
i
m
um
1
b
a
r
b
e
l
o
w
Maximum Safe Pressure, but take into account the
compressor limit.
I
n
s
ta
ll
at
i
o
n
f
l
oo
ded
Dr
a
in
l
iquid
i
nt
o
re
s
er
v
o
ir
A
ir
o
r
n
on
-
c
on
de
n
s
a
bl
e
g
a
s
i
n
th
e
H
P
c
ir
c
uit
L
et
a
ir
o
u
t
a
t
h
i
g
h
e
s
t
p
o
i
n
t
.
7 . C o nden s er
pressure too low
Fan cut-in incorrectly set. Adjust pressure switch
8 . D i sch a r g e
Temperature too
high
T
o
o
m
u
c
h
s
uper
h
e
a
t
o
n
s
u
c
t
i
on
.
A
dju
s
t
th
e
r
mo
s
t
a
t
ic
e
x
p
a
n
s
i
o
n
va
l
v
e
s
.
I
nt
er
na
l
b
y
-
p
a
ss
.
C
h
e
c
k
va
l
v
es
a
n
d
j
o
i
nt
s
.
9 . Oil t e mp er a tu re
too high
Super
h
e
a
t
o
n
s
u
c
t
i
o
n
t
o
o
g
r
e
at
.
C
h
e
c
k
a
n
d
a
dju
s
t
t
h
er
m
o
s
ta
t
ic
e
x
p
an
s
i
o
n
v
a
l
v
es
Valve problems.
C
h
e
c
k
pre
ss
ure
s
.
If
n
e
c
e
ss
a
ry,
a
dju
s
t
va
l
v
es
an
d
gaskets.
1 0 . Oil
temperature too
low
Cr
ank
c
a
s
e
h
e
a
t
er
o
u
t
o
f
o
r
d
er.
Rep
l
a
c
e
h
e
a
t
er
Oil
re
t
urn
s
at
u
r
at
ed
in
l
iquid
refri
g
er
a
n
t
A
dju
s
t
th
e
r
mo
s
t
a
t
ic
e
x
p
a
n
s
i
o
n
va
l
v
e
11. Capacity too
g
r
e
a
t
Pr
o
bl
em
w
i
t
h
c
ont
r
o
l
s
y
s
t
em
o
r
o
th
er
a
u
t
om
a
t
ic
devices.
Replace, repair or re-set
1 2 . Insufficient
C
a
p
a
c
i
t
y
Pr
o
bl
em
w
i
t
h
c
ont
r
o
l
s
y
s
t
em
o
r
o
th
er
a
u
t
om
a
t
ic
devices
Replace, repair or re-set.
1 3 . Oil f o a ms
heavily
a f t er
stopp a g e
T
h
er
mo
s
t
a
t
ic
e
x
p
an
s
i
o
n
va
lv
e
(
f
l
uid
in
s
u
c
t
i
o
n
line).
Check
thermostatic expansion valve.
B
u
l
b
l
oo
s
e
o
r
i
n
c
o
r
r
e
c
t
l
y
p
o
s
i
t
i
on
ed
C
h
e
c
k
b
u
l
b
p
o
s
i
t
i
o
n
Cr
ank
c
a
s
e
h
e
a
t
er
o
u
t
o
f
o
r
d
er
Rep
l
a
c
e
h
e
a
t
er