4 inches water column is a critical threshold

Vent limiters are designed for indoor use

and the necessary technical conversion labels required for a code-compliant installation by a licensed HVAC technician

making it versatile for various control system architectures

Provides a direct-fit OEM harness for rapid restoration of unit cooling functions

Hydrolevel 1100H5 Low Water Cut-Off 321042-401 4 inches water column isThe Hydrolevel 1100H5 is a 24VAC low water cut off (LWCO) engineered specifically for high efficiency residential boilers. This compact probe type control utilizes Hydrolevel CycleGard technology to periodically shut down the burner, allowing the water level to stabilize for accurate sensing without nuisance tripping. It features an automatic reset function and an integrated burner circuit test button for rapid diagnostic verification during