When you are out in the field dealing with a failed air handler or furnace

preventing dry-fire conditions in boiler systems

Common signs of failure include a loud grinding or screeching noise (indicating worn bearings)

Designed for versatility

Common Questions: How do I confirm the rotation of this wheel

Bard HVAC 8402-128BX Limit Switch 322838-753 When you are out inDesigned for mission critical over temperature protection, the Bard HVAC 8402 128BX Limit Switch is a high reliability L220F 1shot limit switch engineered for forced air heating and air handling units. As a technical professional, you know that a "one shot" thermal link is the final line of defense; once the 220F threshold is reached, the circuit opens permanently to prevent catastrophic heat damage. This OEM replacement part is a direct, identical