This 24V normally closed unit features a spring return fail-safe mechanism

Orifice sizing is determined by the altitude and the BTU rating of the individual burner

Common HVAC Technical Questions

which can reduce the accumulation of combustion byproducts

Durable Snap Action: The bimetal disc design provides immediate contact break to prevent electrical arcing and extend component life

York S1-024-20878-703 Relay Els PW 17895 This 24V normally closed unitThe York S1 024 20878 703 Relay is a mission critical 24V time delay relay designed for precise sequence control in residential and commercial HVAC systems. Engineering as a direct OEM replacement, this DPDT relay management prevents short cycling of compressor motors and ensures proper indoor blower delay off cycles to maximize latent heat transfer and SEER efficiency. This control board component features a logic driven delay interval, typically