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Before You Change
That Cooling Unit
PART I. PROPER DIAGNOSIS
Cooling units are sometimes diagnosed as being
defective when the actual problem is something
else.
Cooling units are expensive to replace, so
it is important to make the correct diagnosis. By
using the proper test procedures, you can eliminate
a l l o t h e r p o s s i b i l i t i e s b e f o r e c o n d e m n i n g t h e
cooling unit.
Any time the cooling unit is a possible suspect,
use the following step-by-step procedure before
replacing it.
PRELIMINARY CHECKS
A.
1.
C h e c k f o r a n a m m o n i a s m e l l a r o u n d t h e
cooling
unit
and
This could indicate a possible refrigerant
leak.
C h e c k f o r a n y d e p o s i t s o f y e l l o w
powder on the tubing which will sometimes
form around the area of a leak. NOTE: A
yellow deposit in the area of the fill valve
c o u l d b e d u e t o s p l a s h i n g o f r e f r i g e r a n t
during manufacture, and would not indicate
a leak.
2.
Determine if the refrigerator works on one
heat source but not another by testing it in
the alternate modes.
if he gets better cooling results from one
energy source than another.
it indicates the problem is NOT in the cooling
unit.
Make sure the refrigerator is level. Sometimes
3.
the vehicle is level but the refrigerator is
not, due to improper installation.
level on the bottom of the freezer compart-
ment and check side-to-side and front-to-back
levels (see FIG. Al).
necessary to read the level.
4.
C a r e f u l l y c h e c k d o o r g a s k e t s f o r p r o p e r
seal.
A leaking gasket can allow enough
warm air inside the refrigerator to overcome
most of the cooling being produced.
inside
the refrigerator.
Also, ask the customer
If this is true,
Place a
Use
a
mirror,
For a simple method to check gaskets, close
the door on a dollar bill, then pull the dollar
If no resistance is felt, the gasket
bill out.
is not sealing properly.
on all four sides of the door.
FIG. Al
5.
C h e c k t h e v e n t i n g s y s t e m t o i n s u r e t h a t
ample air flow is provided at the back of
the refrigerator.
A. Check for, and remove, any restrictions
in the vents, such as filters installed by
t h e c u s t o m e r , b i r d n e s t s i n t h e r o o f
vent, or smashed louvers in the wall
vents (see FIG. A2).
M a k e s u r e t h e c o r r e c t r o o f v e n t h a s
B.
been installed.
RM100, 760, 761, 1300, 1303, 2600, 2800,
if
2802, 3600, 3800, 3802 and 4801, require
a 5" X 24" opening for the roof vent
Smaller models will also use the 5"
24" roof opening. To check this, measure
the
actual
NOT measure the roof vent itself.
FIG. A2.
D-9-l 0
REFRlGERATOR
BULLETIN
R61/7A
DEC.
1987
This should be done
CHECK LEVEL
BOTH WAY.
Larger models such as
opening
in
the
roof
- DO
See
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