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As an airflow proving switch
Technical specifications typically recommend a 2A external fuse to protect the 40VA secondary winding from overcurrent conditions effectively
a fouled or degraded flame sensor is the primary cause of intermittent ignition failure and short-cycling
For contractors managing complex setups
Weil McLain 511-624-402 Pressure Switch Els PW 17895 As an airflow proving switchThe Weil McLain 511 624 402 Pressure Switch is an essential safety component specifically engineered for induced draft combustion systems. Calibrated to a 1. 48" WC setpoint, this SPST (Single Pole Single Throw) switch monitors the differential pressure across the inducer motor to ensure the venting system is clear of obstructions before ignition. This HVAC pressure switch features a dual 1 4" barb connection for easy integration with standard