this SPDT temperature switch provides dependable single-stage control for both heating and cooling applications

For contractors managing commercial air handling units

Durable Construction: Heavy-duty materials designed to withstand vibration and thermal cycling common in industrial mechanical rooms

What does the orange lead wire indicate

Common Questions & Technical Support Is the ZoneFirst PIRR compatible with the 4PDR socket

Watts 0391009 Ball Valve Refrigerant this SPDT temperature switch providesThe Watts 0391009 is a 1 inch Lead Free LF909 QT reduced pressure zone (RPZ) backflow preventer assembly, designed to provide high hazard protection against backsiphonage and backpressure in potable water systems. This model serves as the direct replacement for the older 909QT 1 series, featuring a modular check valve design for streamlined field maintenance. The integrated 1 4 turn ball valves provide reliable shut off capability and easy testing