Description Of Operating Modes - Dometic RM3604 Service Manual

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Dometic MANUAL
Refrigerators
GAS MODE
Move the mode selector button (2) to the UP position.
The GAS mode indicator lamp (C) will illuminate. 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 illiminate and the GAS
mode indicator lamp (C) will go off.
NOTE: Do not continue to reset GAS operation if the
CHECK indicator lamp continues to be illuminated
after several tries.
Press the TEMPERATURE SELECTOR button (3)
until the lamp at the desired position is illuminated.
TEMPERATURE SELECTOR
The temperature selector on the refrigerator controls
both the gas and electric operation, thereby eliminat-
ing the necessity of resetting each time a different
energy source is employed.
After the initial start-up, the temperature selector
should be moved from "COLDEST" to the desired
temperature setting, 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
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 opera-
tion with AC having priority over GAS. Either the AC
indicator 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 operat-
ing 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 indicator
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.
SPECIAL FEATURES 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 fully auto-
matic operation – selecting the best energy source
available with AC and GAS priority. The temperature of
the refrigerator will be maintained at the MID position
within normal temperature tolerances. The power mod-
ule 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.
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