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.

Replaces:

Suburban: 521099, 520820, 232613, 230483, 230587, 231328, 231427, 231741, 520741, 520871
Fenwal: 06-236879-002

Works with furnace models:

DD-17-DSI NT-12EF, NT-12F, NT-12FC, NT-12L, NT-12LE, NT-12MEF, NT-12S, NT-12SE, NT-16EF, NT-16F, NT-16FC, NT-16L, NT-16LE, NT-16MEF, NT-16S, NT-16SE, NT-16SEQ, NT-16SQ, NT-20L, NT-20LE, NT-20S, NT-20SE, NT-20SEQ, NT-20SQ, NT-20T, NT-24M, NT-24S, NT-24SP, NT-25K, NT-30K, NT-30M, NT-30S, NT-30SP, NT-34S, NT-34SP, NT-35K, NT-40, NT-42S, NT-42T, SF-20, SF-20F, SF-20FQ, SF-20Q, SF-25, SF-25F, SF-25FQ, SF-25Q, SF-30, SF-30F, SF-30FQ, SF-30Q, SF-35, SF-35F, SF-35FQ, SF-35Q, SF-42, SF-42F, SF-42FQ, SF-42Q, SFV-20, SFV-25, SFV-30, SFV-35, SFV-42, SH-35, SH-35F, SH-42, SH-42F, SHD2542