1-3
1-31-3
1-3
The following general information explains
several methods for checking operation of
the refrigeration system. This information
applies to all systems covered in this
manual. The correct operation of a refrig-
eration system is dependent upon the
proper function of each of the parts com-
prising the system.
If the system does not operate properly
(long run periods, warmer than normal tem-
peratures), the trouble may be caused by
one of the following conditions:
(1) - R(1) - R
(1) - R(1) - R
(1) - R
estricted Capillary Testricted Capillary T
estricted Capillary Testricted Capillary T
estricted Capillary T
ubeube
ubeube
ube
The opening of a capillary tube is about the
same diameter as the period at the end of
this sentence. Because of this, it is easy to
restrict the tube. Extra precautions should
be taken when any service procedure in-
volves moving or touching the capillary
tube. The slightest kink can cause a com-
plete tube restriction.
Restrictions of the capillary tube may be
caused by: (1) moisture freeze-up, (2) for-
eign particles lodged in the tube, or (3) a
bend or kink.
If the capillary tube is restricted, there will
be a noticeable lack of frost on all cooling
surfaces; the compressor may operate for
a short period of time and cycle on the
CHECKING OPERACHECKING OPERA
CHECKING OPERACHECKING OPERA
CHECKING OPERA
TIONTION
TIONTION
TION
overload. Because some models can hold
the entire charge in the condenser, the com-
pressor may run continuously and a defi-
nite vacuum will be noticed in the low side.
When moisture freeze-up causes a restric-
tion, it usually occurs at the outlet end of
the capillary tube. Normally, frost buildup
can be detected in this area.
NOTE: NOTE:
NOTE: NOTE:
NOTE:
When using a heat gun or hairWhen using a heat gun or hair
When using a heat gun or hairWhen using a heat gun or hair
When using a heat gun or hair
dryerdryer
dryerdryer
dryer
, use low heat. Never use a torch., use low heat. Never use a torch.
, use low heat. Never use a torch., use low heat. Never use a torch.
, use low heat. Never use a torch.
At the discharge end of the capillary, apply
heat. If there is enough head pressure, and
if the restriction is caused by moisture
freeze-up, you will be able to hear a gurgling
noise as the heat releases the refrigerant
through the tubing.
It is possible that this moisture will be ab-
sorbed by the drier and remedy the trouble.
However, if the freeze-up reoccurs, you
must replace the drier.
A kink in the capillary tube will reveal the
same symptom as a moisture freeze-up,
except for the accumulation of frost. Where
possible, check the capillary tube and
straighten any kinks to relieve the restric-
tions. Check the unit operation. If the con-
dition persists, replace the defective part.
If the freeze-up condition does not exist and
there is not a kink, you can assume that a
foreign particle is causing the restrictions.
The only remedy in this case is to replace
the restricted part.
(2) - P(2) - P
(2) - P(2) - P
(2) - P
artial Rartial R
artial Rartial R
artial R
estriction In Low Sideestriction In Low Side
estriction In Low Sideestriction In Low Side
estriction In Low Side
T T
T T
T
ubingubing
ubingubing
ubing
Bent tubing, foreign matter, or moisture in
the system may cause a partial restriction
in the low side tubing. This is usually indi-
cated by frost-free tubing between the re-
through the return opening in the divider.
However, most of the air moving across the
evaporator is blown through the freezer air
tunnel and circulated throughout the freezer
compartment. It then circulates back across
the fin and tube evaporator where it begins
another cycle.
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