Description Of Operating Modes - Dometic S1521 Service Tips Manual

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 illuminate 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
eliminating 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 operation 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 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
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 nonfunctional, the control system will revert to fully
automatic 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 module will continually attempt to reestablish operation of the display module.
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