The dry contact relay configuration is rated for resistive

With a 5 Cv flow factor and a required operating pressure differential of 5-125 PSI

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

This is essential for maintaining proper lubrication and preventing catastrophic compressor failure during cold starts

reducing the need for multiple specialized modules

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