York S1-025-32780-000 Ignitor Assembly 320788-704 Smith 100278231 Coupler is a

Smith 100278231 Coupler is a precision-engineered pump coupler replacement designed for high-performance hydronic and domestic hot water systems

the Marley 4520-0011-000 is the standard OEM replacement for most Marley MUH-model heaters requiring a 300°F limit

Contractor-Grade Durability: Constructed with heavy-duty materials to withstand the high ambient temperatures found in commercial galleys and furnace rooms

Using a switch with reverse logic will result in an immediate system lockout as the board will see the circuit as closed before the inducer starts

York S1-025-32780-000 Ignitor Assembly 320788-704 Smith 100278231 Coupler is aThe York S1 025 32780 000 Ignitor Assembly is a critical OEM replacement part designed for precision ignition in gas fired furnaces and rooftop HVAC units. This pilot ignitor assembly leverages a reliable 24V ignition system to ensure consistent burner engagement, effectively eliminating delayed ignition issues and cold start failures. As a direct fit component, the S1 025 32780 000 maintains the exact electrical specifications and mechanical