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What is the purpose of the proof of closure switch
It uses a two-wire control signal with a path for the auxiliary end switch to signal other HVAC components
refer to the specific furnace manual to determine if a separate high-altitude pressure switch is required for your installation site
As a normally open regulator
Carrier HH18HA509 Limit Switch 30067439-890 What is the purpose ofThe Carrier HH18HA509 Limit Switch is a critical OEM replacement part engineered for precise thermal protection in Carrier, Bryant, and Payne furnaces. This high temperature limit switch operates as a normally closed safety device, designed to open the electrical circuit if the heat exchanger exceeds safe operating parameters. Rated for a 155F195F range, it features an automatic reset mechanism that restores continuity once temperatures drop below the
