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DIAGNOSTIC SERVICE MANUAL
Dometic
®
RM2604/2804
Refrigerators
8.6 COOLING UNIT
The cooling unit is a self-contained, hermetically sealed
set of coils where the refrigeration process takes place.
The chemicals involved in the cooling process include
hydrogen, ammonia, water and a rust inhibiting agent.
There are no repairs recommended on the cooling unit.
If it is defective, replace with a new cooling unit. To
check the cooling unit, first verify the AC heating ele-
ment is good (See Sec. 2.1). Then place approximately
one gallon of water inside the refrigerator and place a
thermometer in one of the containers of water. Next,
supply 115 volts direct to the AC heating element and
operate for at least 12 hours. Then check the tempera-
ture on the thermometer. It should be at 45 degrees or
lower depending on test conditions (See ambient tem-
perature Sec. 8.5). If so, the cooling unit is good. If the
temperature of the water is above 45 degrees, replace
the cooling unit.
8.7 FOOD STORAGE
Proper refrigeration requires free air circulation within the
food storage compartment. Restricted air circulation
within this compartment will cause higher cabinet
temperatures. To remedy this situation, simply rearrange
your foodstuffs. It is also essential that the shelves are
not covered with paper or large storage containers.
Always remember to allow for proper air circulation.
Odorous or highly flavored foods should always be
stored in covered dishes, plastic bags or wrapped in foil
or waxed paper to prevent food odors. Vegetables,
lettuce, etc., should be covered to retain their crispness.
NEVER PUT HOT FOOD INTO THE REFRIGERATOR.
To reduce frost formation in and on the freezing com-
partment, cover stored liquids and moist foods and do
not leave the door open longer than necessary. When
the refrigerator is heavily loaded, it takes a longer time
for refrigerator temperatures to lower, also increasing
the ice making time. A very heavy load may also cause
defrosting.
8.8 HIGH HUMIDITY
High humidity may cause a small amount of condensa-
tion to form on the frame of the refrigerator. In some
cases it can develop to such a degree that it will run off
the frame. As the humidity is reduced, the sweating will
decrease. High humidity can also be a factor in rapid
formation of frost.
8.9 INTERIOR LINER SEAL TO FRAME
There is a seal that is applied to the liner in the area
where the metal frame makes contact with the interior
liner. If this seal is incomplete, cold air can migrate out
to the metal frame. If this happens, condensation could
form on the frame and could promote rapid formation of
frost. If you suspect an improper seal, apply a small
bead of silicone all the way around the perimeter where
the frame meets the interior liner.
