This OEM Reznor part is engineered to withstand the thermal demands of commercial HVACR applications

Delivering 140 lb-in torque

If your unit utilizes the older 031-series boards listed above

The switch opens when head pressure drops to 300 PSIG (stopping the fan) and will automatically close once the pressure rises back to 400 PSIG (restarting the fan)

necessitating replacement to protect the rear section casting

ASCO SC8238T405-24VDC Valve 320735-701 This OEM Reznor part isThe ASCO SC8238T405 24VDC is a high performance 2 way normally closed solenoid valve designed for precision fluid control in demanding industrial and HVACR environments. As a premiere 1 2 inch NPT solenoid valve, this direct acting component provides immediate response times without requiring a minimum operating pressure. Engineered by ASCO Power Technologies, it features a robust brass body and FKM elastomers, making it an ideal 24VDC solenoid valve