This HVAC control board comes pre-programmed from the manufacturer

The external adjustable setpoint allows for field calibration

this HVAC duct sensor handles everything from standard air handling unit discharge to extreme return air conditions

Durable Construction: Features silver cadmium oxide contacts to prevent sticking and carbon buildup

or the compressor cycling on the thermal overload protector due to the start winding remaining energized too long

Lennox 49K71 Limit Switch R-134A This HVAC control board comesThe Lennox 49K71 Limit Switch is a critical safety component engineered for precision temperature monitoring in high output furnace and air handler applications. This OEM furnace limit switch is factory calibrated to an L220F trip point, ensuring the electrical circuit breaks immediately if internal temperatures exceed safe operating parameters. As a manual reset limit control, it requires a technician to physically intervene after a high limit event,