Precision Calibration: Adjustable sensitivity and a clear 55-85F dial range enable exact terminal equipment modulation

serving as a reliable alternative to OEM components

ensuring stable manifold pressure across various firing rates

The "B" indicates the basic model

ensuring stable control air quality

Williams P321942 Limit Switch 326010-701 Precision Calibration: Adjustable sensitivity andThe Williams P321942 Limit Switch is a critical OEM safety component engineered for Williams Forsaire Direct Vent Wall Furnaces and 6007 Series counterflow units. This temperature sensitive switch, classified as an L210 40F limit switch, monitors plenum air temperature to prevent heat exchanger damage and hazardous overheating conditions. As a technical HVAC replacement part, it is designed with a normally closed contact configuration that opens the