This 12V DC 3G Control Board is a replacement board for all Suburban 12V furnaces as well as Suburban Water Heater model 520820.
When the thermostat calls for heat, the RVDS100-HC will verify the sail switch is open before energizing the inducer blower. Once the inducer blower is energized, the RVDS100-HC will verify the sail switch has closed and begin a 15 second pre-purge cycle. Following the inducer blower pre- purge cycle, the gas valve and spark ignitor are energized and the RVDS100-HC will verify the presence of flame. If flame has not been sensed after 7 seconds; the control will attempt 2 more trials for ignition, if flame is not sensed after 3 trials for ignition, the RVDS100-HC will enter a 1-hour lockout. If flame is detected, the spark ignitor is turned off and the gas valve remains energized. Once the thermostat is satisfied, the gas valve is de-energized immediately and a 90 second post-purge cycle of the inducer blower is enforced. After the 90 second post purge cycle, the inducer blower is turned off. Note: Lockout is cleared by recycling the input voltage.