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responsible for purging the heat exchanger of residual combustion gases and ensuring the negative pressure required to close the furnace pressure switch
How do I verify if this 2-pole switch is compatible with my furnace
Does this unit come with an access valve
causing plenum temperatures to exceed the 325°F threshold
Is the float included with the 173103 head mechanism
McDonnell & Miller FS4-3S Switch 322838-754 responsible for purging the heatThe 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