1-12
1-121-12
1-12
SymptomsSymptoms
SymptomsSymptoms
Symptoms
::
::
:
High SideHigh Side
High SideHigh Side
High Side
- -
- -
-
Lower than normalLower than normal
Lower than normalLower than normal
Lower than normal
Low Side -Low Side -
Low Side -Low Side -
Low Side -
Higher than normalHigher than normal
Higher than normalHigher than normal
Higher than normal
WW
WW
W
attage -attage -
attage -attage -
attage -
Lower than normalLower than normal
Lower than normalLower than normal
Lower than normal
DiagnosisDiagnosis
DiagnosisDiagnosis
Diagnosis - Inefficient compressor. Cool-
ing surfaces may be covered with a thin film
of frost, but the temperature will not de-
scend to cut off temperature of the control,
even with continuous running. Also, the
condenser will be noticeably cooler to the
touch than normal. Once the confirmation
that an inefficient compressor is made, the
compressor should be replaced.
SymptomsSymptoms
SymptomsSymptoms
Symptoms
::
::
:
High Side -High Side -
High Side -High Side -
High Side -
NormalNormal
NormalNormal
Normal
Low Side -Low Side -
Low Side -Low Side -
Low Side -
Normal to slightlyNormal to slightly
Normal to slightlyNormal to slightly
Normal to slightly
higher than normal -higher than normal -
higher than normal -higher than normal -
higher than normal -
suction line possiblysuction line possibly
suction line possiblysuction line possibly
suction line possibly
sweatssweats
sweatssweats
sweats
WW
WW
W
attage -attage -
attage -attage -
attage -
NormalNormal
NormalNormal
Normal
DD
DD
D
iagnosisiagnosis
iagnosisiagnosis
iagnosis - Separated capillary tube. The
capillary tube must be connected to the suc-
tion line to provide proper heat transfer.
Without this transfer, liquid refrigerant in the
capillary tube enters the evaporator at a
slightly higher temperature thereby lessen-
ing the ability to remove heat from inside
the refrigerator. The customer complaint
would be long run time, slow ice produc-
tion, warmer fresh food temperature, in
general, poor overall performance. Another
symptom of a separated capillary tube
could be moisture on the floor behind the
refrigerator. The heat from the capillary tube
is utilized by the suction line to ensure that
vapor rather than liquid refrigerant is re-
turned to the compressor. If liquid is
present in the suction line, frost or moisture
forms on the outside of the line and even-
tually drips to the floor.
Once it has been determined through
proper diagnosis that a leak is present in the
sealed system, attempt to find the leak be-
fore opening the system if possible. To
check the high side for leaks, be sure that
the compressor is running. During run time
the high side pressure is greater. To increase
the pressure slightly, stop the condenser
fan blade or block the air flow through the
condenser. To check the low side for leaks,
stop the compressor. During off times, the
low side pressure will increase to equalize
with the high side. By warming the evapo-
rator, this pressure will increase. If too much
refrigerant has leaked out to create enough
pressure to locate the leak, add 4 ounces of
the proper refrigerant to the system and
proceed with the test procedure.
The presence of oil around a tubing joint
usually indicates a leak. Care must still be
taken to pinpoint the exact location. Re-
member that a leak detector compatible
with R134A refrigerant must be used. A
sealed system component, such as the
evaporator or yoder loop, should not be
condemned unless a non-repairable leak is
confirmed. This should be determined by
either locating the actual leak or by isolat-
ing the component from the rest of the sys-
tem and determining if it holds pressuriza-
tion or a vacuum - whichever method is
chosen.
LEAK TESTINGLEAK TESTING
LEAK TESTINGLEAK TESTING
LEAK TESTING
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