The S1-4HK16501506 is designed for York

Mid-Point Grounding: Increases safety and reduces electromagnetic interference within the burner control circuit

The Functional Devices RIB2421C is a contractor-grade enclosed pilot relay designed for seamless integration into building automation systems (BAS) and HVACR control circuits

If you see visible carbon buildup or hear "chattering" during the ignition cycle

Swapping to this 3/16 inch gas regulator orifice allows for specific BTU capacity adjustments

Trane BLW1139 Inducer Blower Els PW 17895 The S1-4HK16501506 is designed forThe Trane BLW1139 Inducer Blower is a critical single stage draft inducer engineered for high efficiency furnace combustion systems. As the direct OEM replacement for BLW0861, this motor assembly ensures proper venting of flue gases by creating a steady vacuum within the heat exchanger. This Trane centrifugal blower is designed to meet strict furnace draft inducer specifications, maintaining the pressure switch closure required for the ignition