This model is a direct acting control with a 1/4" nickel bulb

Compact Housing: IP30 rated enclosure provides protection against dust and debris while maintaining a small footprint for easy mounting

It features a 15-second pre-purge

Calibrated with a precise 350 PSI pressure setting

this assembly ensures a stable pilot flame is maintained to safely light the primary burner

York S1-025-42734-000 Wire Harness 326058-756 This model is a directThe York S1 025 42734 000 Wire Harness is a critical OEM component engineered specifically for 2 stage furnace systems and multi stage air conditioning units. Designed to facilitate a seamless interface between the HVAC control board and peripheral system components, this harness ensures precision signal transmission for staggered heating and cooling cycles. As a veteran grade York replacement part, it addresses common connectivity issues in high