Diagnosing Cooling Problems
Read this information before attemptin
to perform
service on this refri
erator. Understand the service
procedures before performin
the service.
Always apply the safety precautions on page 1 and the
precautions listed below. Failure to follow these safety
precautions can result in substantial property damage,
severe personal injury, or death.
•
Never bend, drop, drill, weld, or hammer the
coolin
unit. Doin
so can cause the coolin
unit
to rupture, releasin
chemicals under hi
h pres-
sure. Contact with these chemicals ma
cause
severe burns to the e
es or skin.
•
Never attempt to repair or rechar
e the coolin
unit. A defective coolin
unit must be replaced.
Diagnostic Procedures
1. Make sure the coolin
problem occurs while op-
eratin
the refri
erator in each mode of opera-
tion. If not, the coolin
problem is not the coolin
unit. Refer to Trouble Shootin
sections to deter-
mine cause for insufficient coolin
on identified
mode of operation.
2. Make sure the interior ventin
is not obstructed
and is providin
air circulation across the coolin
unit’s absorber coils and condenser fins.
3. Make sure the 12 VDC ventilation fan is func-
tional. The fan will operate whenever the vehi-
cle’s interior temperature reaches 85
°
or hi
her.
See pictorial and trouble shootin
uide on
pa
es 17 & 18.
4. An off-level situation, if the infraction is mar
inal,
will allow the refri
erator to continue to operate
at a reduced level of coolin
until the refri
erator
is leveled. Greater off-level situations will stop the
refri
erant circulation and cease coolin
. Normal
vehicle levelin
to provide comfort for the occu-
pants is within the refri
erator’s operatin
limits.
The refri
erator’s operatin
limits are 3 de
rees
off-level front-to-back and 6 de
rees off-level
side-to-side. Operatin
the refri
erator outside of
these operatin
limits for an extended time will
cause irreparable dama
e to the coolin
unit.
5. Check the input volta
es and
as pressure to
insure correct heat input and volta
e limits.
The specifications are as follows:
a. 120 VAC - 108 VAC min. to 132 VAC max.
b. 12 VDC - 11.5 VDC min. to 15.4 VDC max.
c. Gas - 10.5" W.C. min. to 11" W.C.
Correct input volta
es and propane
as suppl
are critical for the coolin
unit to function properl
.
6. Check the area of the coolin
unit for refri
erant
leaks. The smell of ammonia is a positive si
n of
a refri
erant leak.
When an ammonia smell is
detected, the cooling unit must be replaced.
An-
other si
n of a refri
erant leak is the appearance
of a
ellow powder in the vicinit
of the coolin
unit.
When this powder is observed, the cooling
unit must be replaced.
7. Check the absorber coils; the bottom coil will be
warm and the top coil will be cooler.
If the coils
are cold and the cooling units flue enclosure is
too hot to touch, there is a blockage in the cooling
unit and the cooling unit must be replaced.
WARNING
19
