a manufacturer-approved conversion kit consisting of the correct orifice and regulator spring must be used

ensuring communication with the integrated furnace control board remains intact

it provides consistent conductivity for direct spark ignition (DSI) sequences

This self-acting

this Conbraco 18C-531-4 is designed

York S1-9951-1281 Orifice 321894-709 a manufacturer-approved conversion kit consistingMaintaining precise combustion on a manifold requires exact fuel to air ratios, and the York S1 9951 1281 Orifice is the key technical component for achieving that balance. This #30 (. 1285) Nat Gas Orifice is a genuine Source1 OEM replacement part designed specifically for York, Coleman, and Luxaire gas furnaces. Featuring a precision drilled 0. 1285 inch diameter, this orifice regulates the flow rate of natural gas at standard manifold pressures,