Dometic NDR1272 Installation And Operating Instructions Manual page 9

O F F
A
DESCRIPTION OF OPERATING
MODES
AES/AUTO MODE
When operating in the AES/AUTO mode, the AES/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 be-
comes 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 AES/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 seconds 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.
display panel
2 - WAY
2
CHECK
C
C O L D 1 2 3
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 continu-
ally attempt to reestablish operation of the display mod-
ule.
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.
4 5 COLDEST