the internal bimetal disc has likely fatigued and requires replacement

or steam blowing through the return lines

Attempting to use this on an R-410A system will result in improper refrigerant flow and likely system failure due to the different pressure requirements of the refrigerants

accommodating a wide range of pump cut-in/cut-out settings

Flexible Fuel Capability: Fully compatible with natural gas

York S1-029-20099-000 Tube 322838-754 the internal bimetal disc hasEnsure reliable ignition sequencing across your burner manifold with the York S1 029 20099 000 Carryover Tube. As an essential OEM gas furnace part, this crossover runner is engineered specifically for York 180 300K BTU burners, facilitating the seamless transfer of the pilot flame to ensure all burner sections ignite simultaneously. Field technicians recognize this as a critical component in preventing delayed ignition and combustion rumble, common