it effectively prevents system failure during thermal expansion cycles

Never bypass a vent safety switch

and HH24CZ022

closing the circuit once the system pressure drops back to the 185 PSI cut-in point

Float switches or secondary sensors must be sourced separately and integrated according to local mechanical codes

Fenwal 35-703917-007 Control 324846-701 it effectively prevents system failureThe Fenwal 35 703917 007 is a high performance 120V Direct Spark Ignition (DSI) control designed for precise microprocessor based burner management. Engineered for natural, LP, and manufactured gas applications, this Fenwal ignition module features a 0 second pre purge and a 15 second trial for ignition (TFI) window. As a veteran grade HVACR replacement part, it incorporates a diagnostic LED that provides immediate feedback via three distinct error