Internal Protection: Patented air-in and water-out design provides superior relief valve performance under dual failure conditions

it is the direct factory-authorized solution for maintaining the combustion analysis parameters of Lochinvar Knight and CWN series boilers

it is designed for precise regulation where tight shut-off is non-negotiable

Use a multimeter to verify the control signal before replacing the component

and terminate at a safe point of disposal to prevent property damage during a blow-off event

Fenwal 35-665576-111 Ignition Module 326058-755 Internal Protection: Patented air-in andThe Fenwal 35 665576 111 is a microprocessor based 120V HSI Control engineered for high reliability performance in residential furnaces, hydronic boilers, and commercial water heaters. This hot surface ignition module features a 20 second heat up time and a 4 second trial for ignition (TFI) period, ensuring precise sequencing for gas fired heating equipment. As an OEM grade replacement, it provides robust flame sensing using Detect A Flame technology,