Control System; Auto Mode - Dometic RM3762 User Manual

abSoRPtion cooling SyStEm
In an absorption refrigerator system, ammonia is liquefied 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 hydro-
gen gas, which causes the ammonia to evaporate, creating a
cold condition in the freezer.
When starting this refrigerator for the very first time, the cool-
ing cycle may require up to four hours of running time before
the cooling unit is fully operational. The tubing in the evapora-
tor section is specifically sloped to provide a continuous move-
ment of liquid ammonia, flowing downward by gravity through
this section.
leveling the refrigerator
Leveling is one of the requirements for proper operation with
absorption refrigerators. To ensure proper leveling the vehicle
needs to be leveled so it is comfortable to live in (no noticeable
sloping of floor or walls).
any time the vehicle is parked for several hours with the refrig-
erator operating, the vehicle should be leveled to prevent this
loss of cooling.
If the refrigerator is operated when it is not level and the vehi-
cle is not moving, liquid ammonia will accumulate in sections
of the evaporator tubing. This will slow the circulation of hy-
drogen and ammonia gas, or in severe cases, completely block
it, resulting in a loss of cooling.
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.
! WARNING
FIRE HAZARD. Before lighting the gas burner,
after that the RV has not been used for some
time, please check that the gas path between
the burner jet and the burner tube has not been
obstructed. Failure to heed this warning could
cause a fire resulting in personal injury
REfRigERatoR ovERviEw
oPERating thE REfRigERatoR
aUtomatic EnERgy SElEctoR

contRol SyStEm

The refrigerator is equipped with an automatic energy selector
control system. The user turns the refrigerator on, selects the
desired temperature and then, the refrigerator automatically
selects the most suitable energy source available (either 120 V
aC or LP gas operation). The system can be set by the user to
be fully automatic (auTO mode is selected) or to operate on
LP gas only (auTO mode is off).
The refrigerator controls will work down to 9.6 volt DC.
modES of oPERation - aUto and gaS

aUto mode

When the refrigerator is in auTO mode, it automatically uses
the most efficient energy source that is available for operation.
should a more efficient energy source become available during
operation, the refrigerator controls change from the current
energy source to the more efficient energy source as follows:
1. aC operation (if 120V aC is available). aC operation is
only possible in auTO mode.
2. Gas operation (if 120V aC is not available).
gaS mode (manual lP gas operation)
When auTO mode is turned off, the refrigerator uses gas as
energy source - even if aC is available.
!
FIRE OR EXPLOSION HAZARD. When refu-
eling or parked near gasoline pumps, shut off all
LP gas appliances. Failure to heed this warning
could cause a fire or explosion resulting in death
or severe personal injury.
SOLENOID VALVE .
INLET FITTING
MANUAL SHUTOFF VALVE .
Shown in open position
PRESSURE TEST PORT .
BURNER JET .
- 5 -
WARNING
NUT
THERMOCOUPLE
SPARK ELECTRODE
BURNER TUBE
BURNER MOUNTING SCREW