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20" NC requirement
Beyond a mechanical failure of the switch itself
Frequent tripping is usually a symptom of a dirty air filter
if it triggers due to excessive heat
Weil McLain 511-624-451 Pressure Switch Els PW 17895 20" NC requirementEnsure your combustion air proving circuit is operating within factory specifications with the Weil McLain 511 624 451 Pressure Switch. Designed as a critical safety component for specific high efficiency boiler models, this replacement air pressure switch features a precise 1. 25" WC setpoint and a highly reliable SPST (Single Pole Single Throw) configuration. Technicians often encounter ignition lockout codes when the inducer motor fails to pull a
