Dometic Manual Refrigerator Diagnostic Service Manual - WebRing

(19)
In recent years Dometic has engineered a new
type of cooling unit that utilizes an improved
siphon pump tube design which drastically
reduces the possibility of permanent damage to
the coils if operated in an out-of-level condition,
or too much heat is generated at the boiler
section. As we can see from this drawing, the
siphon pump tube is enclosed in the design
and is surrounded by a weak ammonia solution,
which will protect the pump tube from abnormally
over-heating. This type of unit; however,
does not eliminate the need for proper leveling.
The unit still requires gravitational flow to
provide the proper cooling process, and if
leveling is outside the necessary limits, cooling
will dramatically slow down or stop completely.
The cooling coils are not normally damaged in
this fashion and once proper leveling is maintained,
the cooling process will resume.
(20)
Spirit or bubble levels are no longer being
supplied with the new style refrigerators as the
RV or vehicle only needs to be leveled so it is
comfortable to live in, with no noticeable sloping
of the floor or walls. For diagnosis, the new
style cooling units that incorporate the
protection boiler system, can be differentiated
from the older style coils by the shape and
design of the outer boiler box cover on the rear
of the cooling unit. These units will incorporate
a circular metal cover,
. . . while the older style utilizes a square
shaped enclosure. We will discuss diagnosis
and troubleshooting of these units in more
detail later in the program.
\ PUMP
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I I