Carrier HH18HA420 Limit Switch 320735-701 This motor is critical for

This motor is critical for maintaining the proper draft required to satisfy safety circuits and prevent soot buildup on the burner assembly

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

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

meaning it will re-close the circuit once the water temperature drops below the fixed or adjustable differential

Carrier HH18HA420 Limit Switch 320735-701 This motor is critical forThe 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