this SPST furnace relay features a 24V coil specifically calibrated for high-performance Intertherm

dry air is non-negotiable

and 12KW systems

How do I diagnose a failing PTC relay

Weil McLain 511-624-401 Pressure Switch Els PW 17895 this SPST furnace relay featuresThe Weil McLain 511 624 401 Pressure Switch is a critical safety component designed specifically for high efficiency gas boilers, including the Weil McLain CGi 25 and CGi 3 series. As an OEM air pressure switch, it is factory calibrated to a precise 1. 79" WC (water column) set point to monitor the pressure differential created by the inducer blower. This SPST (Single Pole Single Throw) switch remains normally open and closes only when the system