Optimized Flame Pattern: Precise venturi design promotes stable combustion efficiency and reduces call-backs for lifting or yellowing flames

This specific model is certified for a 3

The impedance-protected coil provides thermal protection during continuous operation or stall conditions

As a delayed-opening gas valve

Rugged Taupe Construction: Neutral finish designed specifically for the aesthetic and durability requirements of commercial HVAC systems

Carrier HH18HA304 Limit Switch R-410A Optimized Flame Pattern: Precise venturiThe Carrier HH18HA304 Limit Switch is a critical safety component designed for precise thermal monitoring in residential gas furnaces and air handlers. Engineered as a L55F 22 furnace limit switch, this normally closed (NC) sensor features a 55 degree Fahrenheit fixed temperature trip point with a 22 degree differential for automatic reset. This OEM replacement ensures the furnace high limit switch maintains the heat exchanger within safe operating