which is the required signal for the Bunn start circuit

The standard threaded stem is optimized for push down to open action

It features durable construction but is rated for NEC Class 2 "not wet" environments

this Gen 2 component is engineered for 97% AFUE multi-position furnaces

Compatible with high-velocity systems where maintaining low resistance to airflow is critical for peak performance

Carrier HH18HV120 Limit Switch Els PW 29614 which is the required signalThe Carrier HH18HV120 Limit Switch is a critical safety component designed for precise thermal regulation within HVAC systems, specifically for Carrier, Bryant, and Payne furnace models. This OEM replacement part operates as an automatic reset thermal disc, calibrated to open the circuit when temperatures reach 120F and close (auto reset) when they drop to 90F. As a veteran technician knows, maintaining the integrity of the furnace high limit switch