10
SECTION C. OPERATING INSTRUCTIONS
REFRIGERATORS WITH
AUTOMATIC IGNITION:
RM2552 AND RM2553
2. CONTROLS
Most LP gas appliances used in recreational vehicles are vented to the outside of the vehicle. When parked
close to a gasoline pump, it is possible that the gasoline fumes could enter this type of appliance and ignite
from the burner flame, CAUSING A FIRE OR AN EXPLOSION.
In an absorption refrigerator system, ammonia is liquefied
in the finned condenser coil at the top of the refrigerator.
The liquid ammonia then flows into the evaporator (inside
the freezer section) and is exposed to a circulating flow of
hydrogen gas, which causes the ammonia to evaporate,
creating a cold condition in the freezer.
The tubing in the evaporator section is specifically sloped
to provide a continuous movement of liquid ammonia
downward by gravity through this section. If the refrigerator
is operated when it is not level and the vehicle is not moving,
liquid ammonia will accumulate in sections of the evapora-
tor tubing. This will slow the circulation of hydrogen and
ammonia gas, or in severe cases, completely block it,
resulting in a loss of cooling.
Any time the vehicle is parked for several hours with the
refrigerator operating, the vehicle should be leveled to
prevent this loss of cooling. The vehicle needs to be leveled
only so it is comfortable to live in (no noticeable sloping of
floors or walls).
When the vehicle is moving, the leveling is not critical as the
rolling and pitching motion of the vehicle will pass to either
side of level, keeping the liquid ammonia from accumulat-
ing in the evaporator tubing.
1. IMPORTANCE OF LEVELING A REFRIGERATOR
LEGEND:
A Energy Selector Knob
B Thermostat Knob
C Flame Failure Safety
Valve Push Button
D Piezo Ignitor
E Flame Indicator
FIG. 14
REFRIGERATORS WITH
PIEZO IGNITORS:
RM2452 AND RM2453
FIG. 13
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