The dry contact relay configuration is rated for resistive

reducing the need for multiple specialized modules

it maintains precise superheat control across varying load conditions

making it a reliable standard for veteran contractors handling liquid level verification

This burner is a mechanical component compatible with various fuel sources

York S1-9951-1801 Orifice 320788-704 The dry contact relay configurationThe York S1 9951 1801 Orifice is a precision engineered fixed bore metering device designed for specific residential and light commercial HVAC applications. Featuring a . 180" orifice size (Sz15), this component is critical for maintaining accurate refrigerant flow control within the evaporator coil. As a genuine OEM replacement part, it ensures proper pressure drops across the liquid line, optimizing heat exchange efficiency in York, Coleman, and