Dometic RM 2620 Installation And Operating Instructions Manual page 9

DESCRIPTION OF OPERATING
MODES
AUTO MODE
When operating in the AUTO mode, the AUTO mode
indicator lamp (A) will illuminate. The control system will
automatically select between AC and GAS operation
with AC having priority over GAS. Either the AC indicator
lamp (B) 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 auto-
matically switch to GAS. As soon as AC becomes avail-
able 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 (A) 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 igni-
tion 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 problem is still not corrected,
contact a service center for assistance.
If the control is switched to AC 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.
Refrigerator control panel.
D
A
1 2
B
C
3
E
LIMP 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, 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 re-establish operation of the display module.
The second limp mode of operation will execute when a
failure of the temperature sensing device or associated
electronic circuitry occurs. If this should occur, the con-
trol system will operate on the energy source selected
via the control panel. The cooling unit will run contin-
uously on the selected energy source. The refrigerator
will continue to operate in this mode indefinitely or until
a new sensor is installed and the system is reset.
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