Dometic RM7732 - Manual (Page 8)

5
DIAGNOSTIC SERVICE MANUAL
DOMETIC® RM7030/RM7732
Refrigerators
AES FULLY AUTOMATIC MODE
Turn switch "C" to the "ON" position. The bulb above
push-button "A" will light up green, indicating that the
control system is in the fully automatic mode. In this
mode, 120 volts AC operation has first priority, meaning
the refrigerator will operate on 120 volts AC whenever it
is available. If 120 volts AC is not available, the system
will automatically switch to LP gas operation. The
thermostat inside the refrigerator cabinet cycles the
element/burner as required to maintain the desired
temperature.
NOTE: The AES controls will automatically go to the
fully automatic mode each time switch "C" is turned
"ON".
LP GAS OPERATION
When there is no electrical power available (120 volts
AC) or if the indicator lamp above button "B" is ON, the
AES system will switch to LP gas operation. When the
thermostat in the refrigerator cabinet calls for cooling,
the following sequence takes place:
A. A high voltage spark is created above the burner.
B. Power is sent to a solenoid which opens the gas
control, allowing LP gas to flow to the burner. The
spark ignites the LP gas and the small flame pro-
vides heat for the boiler.
C. The electrode mounted above the burner tube
monitors the flame continuously. If the flame should
fail for any reason, the high voltage spark will start
immediately and relight the flame.
When the thermostat reaches the desired temperature,
it will shut off the gas flame completely. The system will
remain on standby until cooling is again required.
LP GAS ONLY OPERATION
Turn switch "C" to the "ON" position and press push-
button "B". The green indicator lamp over push-button
"B" will come on and the refrigerator will operate only on
LP gas even if 120 volts are available. When the vehicle
engine is turned "OFF", the AES system initiates a 25
minute delay, preventing the refrigerator from operating
on LP gas.
LP GAS DELAY MODE
When the vehicle engine is turned off, the AES system
initiates a delay cycle which prevents the refrigerator
from operating on LP gas for 25 minutes. The purpose
of the delay is to avoid having a gas flame burning dur-
ing a refueling stop at a gas station (see WARNING).
If the vehicle engine is restarted during this delay pe-
riod, the LP gas operation will not start until the delay
period is over. This means each time the vehicle engine
is stopped, the complete 25 minute delay cycle will take
place. If 120 volt AC becomes available during this de-
lay cycle, the AES system will start operation in the 120
volt AC mode immediately, unless the push-button "B"
(LP gas only) has been pressed.
If the RV is stopped somewhere other than a gas sta-
tion, you may wish to cancel the delay cycle. To do this,
turn the main system switch to "OFF" for several sec-
onds, then turn the main system switch back to "ON"
and the system will immediately start operation in the
LP gas mode.
Most LP gas appliances used in recreational ve-
hicles are vented to the outside of the vehicle. When
parked close to a gasoline pump, it is possible that
the gasoline fumes could enter this type of appli-
ance and ignite from the burner flame, CAUSING A
FIRE OR AN EXPLOSION.
FOR YOUR SAFETY, it is recommended that all LP
gas appliances which are vented to the outside
should be shut off when refueling.
The AES system is designed to turn off the LP flame
during refueling stops by the use of the delay cycle
explained previously. However, you must remember
that the delay cycle will be activated only if the
refrigerator is properly connected to the vehicle
engine electrical circuit.
If the refrigerator is not connected to the engine by
the ignition lock wiring, the refrigerator must be
shut off during refueling. To do this, turn the main
system switch "C" to "OFF". Only after the vehicle
has been moved away from the refueling area
should the main system switch "C" be turned back
ON.
SECTION 1
1.1 OPERATION
RM7030 (Product No. 921890201 & 921890301)
OFF ON AC
A B C D E F G H