DOMETIC® RM7030/RM7732 Refrigerators
DIAGNOSTIC SERVICE MANUAL
FLAME FAILURE DURING LP GAS OPERATION
If the LP gas flame fails during the burner cycle, the high voltage spark will continue arcing for up to three minutes.
At the end of three minutes the gas control will stop the flow of LP gas to the burner, the sparking will stop and the red indicator lamp "H" will light up. LP gas operation will not be possible as long as this indicator is ON.
To restart LP gas operation, turn the main system switch "C" to "OFF" for five seconds and then back ON. This will reset the AES controls and turn off the flame failure indicator "H". The system will start another cycle for gas ignition.
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 (turning OFF and ON) the On/Off switch "C" 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.
NOTE: If you are in the AES mode when the flame failure light "H" comes on, the mode indicator lamp "A" (green light) will go out. If 120 volt AC power becomes available during this period, the mode indication lamp will come on showing that the refrigerator is operating on another energy source. The red lamp "H" will remain on until the AES system is reset with an OFF/ON operation of the main switch "C". If you have selected the LP gas only mode (control button "B"), the 120 volt function has been locked out. If the burner fails to light, the green lamp over button "B" will go out and the red lamp "H" will glow indicating flame failure. Even if 120 volts is available, the refrigerator cannot switch to electric operation and all cooling will stop. This fact must be considered when selecting "gas only" operation.
LOW VOLTAGE MONITOR
The AES system requires 12 volts DC power at all times to operate properly. The DC power must be 9.5 volts DC or higher. If the DC voltage drops below 9.5 volts DC, the AES system will switch to an emergency cooling mode.
1.The mode indicator lamp will go off (green light);
2.The system will revert to continuous LP gas operation, with no thermostat control.
The refrigerator will continue to operate in the emer- gency mode until the DC power supply is increased to
10.5volts DC. When 10.5 volts is reached, the mode indicator light (green) will come back on and normal operation will resume.
During the low voltage condition, the interior light will operate normally.
THERMOSTAT
The refrigerator is equipped with a thermostat that can be adjusted to maintain various temperatures. Turn the knob clockwise toward "MAX" for a lower temperature and for a warmer temperature – turn the knob counter- clockwise toward "MIN". Set the thermostat approxi- mately
1.2RM7030 (Product No. 921890401)
AES DISPLAY PANEL
AES MODE
120 VOLTS AC OPERATION
Since 120 volt AC is usually the most economical source for operation of the refrigerator, the AES control system is designed to select this mode whenever it is available. The only exception to this is when push- button "B" (LP gas only mode) is selected. The 120 volt heating elements attached to the boiler provide the heat necessary to operate the cooling system. The thermo- stat controls the power ON and OFF to the elements and maintains the desired temperature.
1.Move the AES mode selector button (2) to the DOWN position. If 120 volts AC is available, the AC mode indicator lamp "A" will illuminate indicating AC operation. If 120 volts AC is not available, the GAS mode indicator lamp "C" will illuminate and the control system will automatically switch to GAS operation.
2.If the CHECK indicator lamp "D" illuminates and the GAS mode indicator lamp "C" is off, the controls have failed to ignite the burner in the GAS mode. GAS operation may be reset by pressing main power ON/OFF button (1) to the OFF then ON position.
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