Dometic RM7732 - Manual (Page 11)

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DOMETIC® RM7030/RM7732
Refrigerators
DIAGNOSTIC SERVICE MANUAL
GAS MODE
Move the AUTO mode selector button (2) to the UP
position. The GAS mode indicator lamp (C) will illumi-
nate. After 45 seconds the burner should be ignited and
operating normally.
On the initial refrigerator start-up, it may take longer
than 45 seconds to allow air to be purged from the gas
line. If the gas does not ignite within 45 seconds, the
CHECK indicator lamp (D) will illuminate and the GAS
mode indicator lamp (C) will go off. To reset when the
CHECK indicator lamp (D) is illuminated, press main
power ON/OFF button (1) to the OFF then ON position.
NOTE: DO NOT continue to reset GAS operation if
the CHECK indicator lamp continues to be illumi-
nated after several tries.
Press the TEMPERATURE SELECTOR button (3) until
the lamp (E) at the desired position is illuminated.
THERMOSTAT
The thermostat on the refrigerator controls both the gas
and electric operation, thereby eliminating the necessity
of resetting each time a different energy source is
employed.
After the initial start-up, the thermostat should be moved
from "COLDEST" to the desired temperature setting is
usually about mid-setting.
TO SHUT OFF THE REFRIGERATOR
The refrigerator may be shut off while in any mode of
operation by pressing the main power ON/OFF button
(1) to the UP (OFF) position. This shuts off all DC power
to the refrigerator, including the interior light.
DESCRIPTION OF OPERATING
MODES
AUTO MODE
When operating in the AUTO mode, the AUTO mode
indicator lamp (B) will illuminate. The control system will
automatically select between AC and GAS operation
with AC having priority over GAS. Either the AC indica-
tor lamp (A) or the GAS indicator lamp (C) will illuminate
depending on the energy source selected by the control
system. If the control system is operating with AC
energy and it then becomes unavailable, the system will
automatically switch to GAS. As soon as AC becomes
available again, the control will switch back to AC
regardless of the status of GAS operation.
GAS MODE
When operating in the GAS mode, the AUTO mode
indicator lamp (B) will be off and the GAS mode indica-
tor lamp (C) will be illuminated. This mode provides LP
gas operation only. The control system will activate the
ignition system and will attempt to light the burner for a
period of approximately 45 seconds. If unsuccessful,
the CHECK indicator lamp (D) will illuminate and the
GAS mode indicator lamp (C) will turn off.
To restart GAS operation, press the main power ON/
OFF button (1) to the OFF and then ON position. The
control system will attempt a new 45 second ignition
sequence.
If the refrigerator has not been used for a long time or
the LP tanks have just been refilled, air may be trapped
in the supply lines. To purge the air from the lines may
require resetting the main power ON/OFF button (1)
three or four times. If repeated attempts fail to start the
LP gas operation, check to make sure that the LP gas
supply tanks are not empty and all manual shutoff
valves in the lines are open.
If the control is switched to AC or DC operation while
the CHECK indicator lamp is on, it will function properly,
but the CHECK indicator lamp will not go off until the
main power ON/OFF button is pressed to the OFF then
ON position.
STANDBY MODE OF OPERATION
This control system contains a feature where it will
continue to operate the cooling system in the event of a
failure of a major operating component. Two different
modes of operation can occur in this category.
If for some reason the display module becomes non-
functional, the control system will revert to full automatic
operation selecting the best energy source available
with AC as first priority, and GAS as the second priority.
The temperature of the refrigerator will be maintained at
the MID position within normal temperature tolerances.
The power module will continually attempt to reestablish
operation of the display module.
The second standby mode of operation will execute
when a failure of the temperature sensing device or
associated electronic circuitry occurs. If this should
occur, the control system will operate on the energy
source selected via the control panel. The cooling unit
will run continuously on the selected energy source. The
refrigerator will continue to operate in this mode indefi-
nitely or until a new sensor is installed and the system is
reset.