McDonnell & Miller FS4-3S Switch 322838-754 This hot surface ignitor typically

This hot surface ignitor typically shows a cold resistance between 50 and 1100 Ohms

Direct OEM Compatibility: Replaces Reznor part 170108 exactly

it is typically rated for up to 30 psi

causing plenum temperatures to exceed the 325°F threshold

Does this unit come with an access valve

McDonnell & Miller FS4-3S Switch 322838-754 This hot surface ignitor typicallyThe McDonnell & Miller FS4 3S (Part Number 114641) is a rugged general purpose liquid flow switch specifically engineered for high demand hydronic and industrial applications. This 1" NPT flow switch features a high grade stainless steel body and hardened stainless steel bearings to minimize friction and prevent mechanical failure in the field. Designed as the direct replacement for FS4 3S E, it integrates a Single Pole Double Throw (SPDT) snap switch