Lennox 12Y80 Sequencer 340155-7026 an "Open Low" or SPDT

an "Open Low" or SPDT model would typically be required

As a veteran-grade HVAC combustion control

Key Benefits for Technicians Direct OEM Cross-Reference: Specifically engineered to replace York S1-026-29620-000 and Rheem 703020 without bracket modifications

these HVAC ignition spring snaps deliver the mechanical integrity required for long-term operational stability and safety in professional thermal processing equipment

Key Benefits High Flow Capacity: Delivers a 5

Lennox 12Y80 Sequencer 340155-7026 an "Open Low" or SPDTThe Lennox 12Y80 Sequencer (OEM part number 104284 03) is a critical thermal sequencer relay used to manage staged heating in Lennox electric furnaces and air handlers. As a DPDT normally open component, it acts as a timing controller for 24V circuits, ensuring that heating elements and blower motors activate in a staggered sequence. This staged operation is vital for preventing massive inrush current and potential electrical overload on the job site.