Fig. 12
SECTION B. OPERATION
1. Importance of leveling a refrigerator
In an absorption refrigerator system, ammonia is
liquified in the finned condenser coil at the top rear 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, flowing 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 evaporator 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 floor or
walls).
When the vehicle is moving the leveling is not
critical, as the rolling and pitching movement of the
vehicle will pass to either side of level
-
keeping the
liquid ammonia from accumulating in the evaporator
tubing.
2.
Controls
Refrigerators with Piezo lgnitors
A. - ON/OFF Switch
B. - Thermostat Gas/Electric
C.
- Safety Push-button
D. - Piezo lgnitor
E. -
Flame View Port
3. Gas Operation
A. To start the refrigerator, turn knob
“A”
to the
“GAS” position. (See Fig. 13).
B. Turn the thermostat knob
“B”
one quarter (l/4)
of a turn from the “OFF” position. (See Fig. 13).
C. Push button “C” in until it bottoms out
-
and
hold. While holding button “C”, push button
“D”
for the piezo ignitor several times to light the
burner. This can be observed through the flame
view port,
“E”,
on the refrigerator. (See Fig. 13).
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