8
OPERATING
INSTRUCTIONS
IMPORTANCE OF LEVELING A
REFRIGERATOR
In an absorption refrigerator system, ammonia is lique-
fied 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.
When starting this refrigerator for the very first time, the
cooling cycle may require up to four hours of running
time before the cooling unit is fully operational.
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 ve-
hicle is not moving, liquid ammonia will accumulate in
sections of the evaporator tubing. This will slow the cir-
culation 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.
OPERATION
This refrigerator is designed to work on 120 volt AC.
The refrigerator require a continuous 12 volt DC supply
to operate the control system, the controls will work down
to 9.6 volt DC.
Overall
Recess
Refrigerator
Dimensions
Dimensions
Model
Height
Width
Depth
Height
Width
Depth
A
B
C
H
W
D
inch 64-17/64 33-11/16
29-5/8
63-3/16
32-3/4
26-1/16
NDE1402
mm
1632
855
752
1605
832
662
This method of installation and these clearances will give you adequate space for service and proper installation.
FIG. 11
Side view
View from above
D
H
A
D
W
C
B
