Description Of Operating Modes; Battery Protection System - Dometic RM4873 Manual

3-WAY DISPLAY PANEL
4. DESCRIPTION OF OPERATING
MODES
A. AES/AUTO MODE
The AES/AUTO mode of operation takes priority over all
other operating modes. If more than one mode selector
button (2), (3) or (4) is in the down position the priority is from
left to right.
When operating in the AES/AUTO mode, the AES/AUTO
mode indicator lamp (A) will illuminate. In this mode the
control system will automatically select the energy source
with AC having top priority, DC second priority and GAS third
priority. If the control system has selected a particular
energy source such as AC, and then it becomes unavailable,
it will automatically seek out the next available energy
source.
B. AC/GAS MODE
When operating in the AC/GAS mode, the AC/GAS mode
indicator lamp (B) will illuminate.
In this mode of operation the control system will automati-
cally select between the AC and GAS energy sources with
AC having first priority.
C. GAS MODE
When operating in the GAS mode, the GAS mode indicator
lamp (C) will illuminate.
The GAS 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 (G) 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 AES/AUTO or AC/GAS mode of
operation while the CHECK indicator lamp is on, it will
A B C
1 2 3 4
D E
1 2 3
F F G G
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.
D.

BATTERY PROTECTION SYSTEM

The control system is equipped with a battery protection
system. If AC power is not available the control will switch
to the DC energy source. If the input voltage at the terminal
block connections is below 12.8 volts the control system will
bypass the DC energy source and attempt GAS operation.
If the GAS energy source is available, CHECK lamp is on,
the control system will return to the DC energy source. The
control will operate in the DC mode for a maximum of 10
minutes.
If the input voltage has not returned above 12.8 volts within
this time, the control will terminate DC operation and turn off
the DC lamp (F) and start gas operation if GAS energy source
is available.
The input battery voltage must rise above 12.8 volts for 25
minutes before DC operation can resume.
As soon as the input voltage rises above the required 12.8
volts, the DC mode lamp (F) will illuminate. However the
control system will remain in the 25 minute DC delay mode
and operate on gas. This delay is to allow sufficient time for
the vehicle charging system to recharge the battery. If 120
volt AC becomes available during the 25 minute delay, the
control will automatically switch to the AC energy source.
E. 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 opera-
tion can occur in this category.
If for some reason the display module becomes nonfunc-
tional, 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.
The second standby mode of operation will execute when a
failure of the temperature sensing device or associated
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