Air Leaks; Door Position; Ambient Temperature; Coolin Unit - Dometic RM2150 Series Service Manual

9.3 AIR LEAKS

Check the gasket on the doors to be sure of a positive
air seal. A simple method to check gaskets is to close
the door on a dollar bill, then pull the dollar bill out. If no
resistance is felt, the gasket is not sealing properly. This
should be done on all four sides of the door. If a gasket
is not sealing properly, first warm the gasket material
with a hair dryer.
DO NOT OVERHEAT
AS YOU CAN MELT THE MATERIAL.
Then close the door and the magnetic strip should pull
the gasket to the metal frame. Leave door closed until
the material has cooled. Then recheck for a positive
seal. If a positive seal cannot be achieved, replace the
door gasket. Also check that the cooling unit is installed
properly. The cooling unit's foam block, the portion that
surrounds the evaporator coils, must be flush to the
cabinet at the back of the refrigerator and have a
positive seal. If the cooling unit is not installed properly,
remove and install properly.
NOTE: Air leaks will cause insufficient cooling as well as
rapid formation of frost.

9.4 DOOR POSITION

The door position can be checked by observing any
misalignment of the door in relation to the frame.
To correct an alignment of the door, loosen the hinge
screws slightly, and reorient the door in the proper
position. Hold the door in its new position and carefully
retighten the hinge screws.
If the door needs more adjustment than is available
through the hinge adjustment, the base can be reposi-
tioned to reorient the door. Turn the refrigerator on its
side to gain access to the two front base screws.
Loosen both screws slightly. Reposition the base until
the door is reoriented. Retighten the base screws while
holding the base in its new position.

9.5 AMBIENT TEMPERATURE

This is the temperature surrounding the recreational
vehicle, as well as the temperature of air at the back of
the refrigerator. As the ambient temperature increases,
the air temperature in the area of the cooling unit
increases. Improper venting at this point, will cause the
cooling unit to have reduced efficiency.
9.6 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 heating element is
good. Then place approximately one-half gallon of water
inside the refrigerator and place a thermometer in one
of the containers of water. Next, supply volts direct to
the heating element and operate for at least 12 hours.
Then check the temperature on the thermometer. It
should be at 45 degrees or lower depending on test
conditions (See ambient temperature Sec. 9.5). If so,
the cooling unit is good. If the temperature of the water
is above 45 degrees, replace the cooling unit.
FOOD STORAGE
9.7
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 rear-
range 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, 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. A very heavy load may also
cause defrosting.
9.8 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.
9.9

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.
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