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This hot surface ignitor typically shows a cold resistance between 50 and 1100 Ohms
specifically Millivolt high-limit applications
causing plenum temperatures to exceed the 325°F threshold
Ensure the shield is grounded at the thermostat subbase only to prevent ground loops
What is the difference between the -003 and -003/U
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