McDonnell & Miller FS4-3S Switch 322838-754 Ensure the shield is grounded

Ensure the shield is grounded at the thermostat subbase only to prevent ground loops

How do I verify if this 2-pole switch is compatible with my furnace

Simplified Cable Management: Follows original equipment routing to prevent interference with mechanical components

Is the float included with the 173103 head mechanism

McDonnell & Miller FS4-3S Switch 322838-754 Ensure the shield is groundedThe 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