Lochinvar & A.O. Smith 100110887 Switch 326010-701 maintaining consistent downstream PSI even

maintaining consistent downstream PSI even in variable municipal water systems

The S-4004UA is a direct replacement part

preventing the low suction pressures that lead to coil icing

check the nameplate for specific inverter-duty ratings if you intend to use it with a VFD

lead wires are typically detachable and may be reused or replaced separately based on the condition of the insulation

Lochinvar & A.O. Smith 100110887 Switch 326010-701 maintaining consistent downstream PSI evenThe 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