Carrier HH18HA420 Limit Switch 320735-701 Always cross-reference your compressor's model

Always cross-reference your compressor's model and serial number against the HVAC part specifications to ensure a match

Johnson Controls P20DA-31 Air Conditioning Pressure Control

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

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

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

Carrier HH18HA420 Limit Switch 320735-701 Always cross-reference your compressor's modelThe 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