Carrier HH18HA420 Limit Switch 320735-701 The H17BA-6 is typically used

The H17BA-6 is typically used in thermocouple-based systems

using this OEM Carrier motor ensures the correct RPM and amperage draw

sending a microamp signal to the gas control valve to ensure safe operation

As long as the combustion byproducts do not contain chemicals that degrade silicone

Carrier HH18HA420 Limit Switch 320735-701 The H17BA-6 is typically usedThe Carrier HH18HA420 Auto Limit Switch is a critical HVAC safety device designed to monitor internal furnace temperatures and protect the heat exchanger from thermal stress. This OEM Carrier replacement part operates with a fixed 90 120F temperature range, ensuring the burner cycles off if the unit exceeds safe operating parameters. As a precision calibrated 90 120 degree limit switch, it features an automatic reset function that restores continuity