This SPST (Single Pole Single Throw) inducer pressure switch is factory-calibrated to a -1

What causes a Williams wall heater fan to stay on constantly

Engineered for compatibility with AI and AI+ series units

Quiet Operation: Wrapped sidewalls reduce noise levels and are more forgiving of minor pulley misalignment compared to raw-edge belts

the controller will adjust the outside air damper to protect the coil from freezing

TE Connectivity KUP-11A55-24 Relay 326058-755 This SPST (Single Pole SingleThe TE Connectivity KUP 11A55 24 is a robust DPDT general purpose relay engineered for reliable HVAC power switching and industrial control applications. Operating on a 24VAC coil, this double pole double throw relay features 10A contact ratings, making it ideal for managing motor starters, solenoids, and heating elements. The unit is housed in a protective enclosed plug in relay casing with a bracket mount for secure installation in high vibration