By allowing the ECO switch to break the thermocouple signal during over-temperature conditions

It is commonly found in C9MPD080

protecting the heat exchanger from localized hot spots

Is the bleed hole necessary for all installations

York S1-024-24116-000 Relay Control By allowing the ECO switchThe York S1 024 24116 000 Relay Control is a standard duty Single Pole Double Throw (SPDT) switching solution designed for 24V HVAC control circuits. This OEM replacement component is critical for managing fan motor speeds, sequencer activation, and heat pump reversing valve logic in York, Luxaire, and Coleman residential systems. The relay features a 24VAC coil and robust silver cadmium oxide contacts to prevent pitting during high frequency cycling.