Rm2190 Operation - Dometic RM2150 Series Service Manual

1.2 RM2190 OPERATION

Gas
Inlet
Conn
NOTE: The gas and electric controls are located at the
rear of the refrigerator and are accessible through the
lower vent in the wall of the vehicle. The gas valve and
12 volt toggle switch are interlocked to prevent simulta-
neous operation by gas and electricity.
A. GAS OPERATION
1) Open the lower vent at the rear of the refrigera-
tor, on the outside of the vehicle, and set the 12
volt toggle switch (E) to "OFF". Turn on the gas
valve (A) so that its handle (D) is in line with the
gas valve body.
2) Turn the gas thermostat knob (B) to setting #4.
Push in the plunger (C) of the flame failure device
3)
for about 5 seconds to clear air from the lines.
(When starting initially or after changing a gas
bottle, it may be necessary to depress the
plunger longer to clear all the air from the lines).
Still pressing in the plunger (C), push in fully
button (F) of the piezo igniter, several times in
quick succession. (A click should be heard each
time it is depressed). The burner should light, but
continue to press in the plunger (C) for 15 sec-
onds, then release it and check that the burner is
lit by looking at the flame through the opening
(G). If the burner has not lit, repeat the lighting
procedure.
The evaporator should show signs of cooling
after about an hour.
4
NOTE: If the gas has to be re-lit when the evapo-
rator is still cold, the thermostat knob (8) must
first be turned to MAX and returned to its normal
setting only after the burner is lit. The refrigerator
has a flame failure device which will automatically
shut off the gas to the burner if the flame is blown
out. While the plunger (C) is being held in, this
device is temporarily inoperative.
TO SHUT DOWN: Turn the handle of the gas valve (A)
away from the cabinet.
B. 12 VOLT ELECTRIC OPERATION
Before taking the vehicle on any road, turn off the gas
cock (A) and, if required, use 12 volts to operate the
cooling unit.
Whenever possible, the cabinet should be pre-cooled,
together with its contents, by starting up and running the
refrigerator on gas for several hours or overnight, before
switching to 12 volt and starting on a trip.
The 12 volt heating element is rated at 95 watts and has
a current consumption of 8 amps; therefore, the refrig-
erator should not be left operating on 12 volt when the
engine in NOT running and charging the battery.
If an automatic cutout relay has not been installed, the
refrigerator should be switched to "OFF" at the toggle
switch soon after the engine is switched off, otherwise
the battery may become discharged.
12 volt operation is not thermostatically controlled but
overcooling is unlikely to occur because this mode of
operation is used only for a few hours at a time.
DO NOT ATTEMPT TO OPERATE THE REFRIGERA-
TOR BY BOTH GAS AND ELECTRICITY AT THE
SAME TIME. ALWAYS ENSURE THAT ONE METHOD
OF OPERATION IS TURNED OFF BEFORE USING
THE ALTERNATIVE.
C. TEMPERATURE REGULATION (Gas Operation)
With the thermostat knob set at #3 or #4, suitable
temperatures will be obtained for the storage of fresh
foods and liquids under average conditions of use.
Usually, no further adjustments will be required, but, in
hot weather, or when more cooling is desired, the knob
should be turned to a higher setting (the higher the
number-the lower [colder] the temperature).
If less cooling is required, turn the thermostat knob to a
lower number.