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The internal heavy-duty butyl diaphragm ensures the permanent separation of air and system water
maintaining furnace blower timing and preventing structural damage during airflow restrictions
For contractors managing commercial HVAC systems
Designed with inherently limited overcurrent protection
Weil McLain 511-624-510 Switch Els PW 17895 The internal heavy-duty butyl diaphragmThe Weil McLain 511 624 510 is a high precision pressure differential switch engineered specifically for residential and light commercial hydronic heating systems. Designed for use with Weil McLain HE and HE II boilers (Sizes 3, 4, and 5), this SPDT pressure switch is a critical safety component that monitors inductor fan operation by sensing air pressure differentials. This specific model features a factory calibrated 1. 00" W. C. setting and is