and PY1REA series units

Operating on 24VAC power at 2VA

The thermal sensing bulb is engineered for accurate pressure-temperature feedback

making it an essential component for boiler feed-water systems and wastewater management

Passive Resistance Output: Two-wire passive temperature sensor design simplifies wiring to most standard controllers and BAS modules

Lochinvar & A.O. Smith 100110887 Switch L99H008 and PY1REA series unitsThe Lochinvar & A. O. Smith 100110887 Blocked Outlet Switch is a critical safety component engineered for BTH 400A Series 100 101 gas water heaters and compatible Lochinvar Knight boilers. This normally closed switch is calibrated to a 1. 39 inch water column, providing precise monitoring of the exhaust vent airflow. Designed to detect back pressure or obstructions in the flue, it serves as a fail safe by interrupting the 24V control circuit to the