When paired with a TW206 thermostat

If you are working in conditions colder than that

As a veteran-grade HVAC control transformer

Constructed for high-demand HVAC steam system maintenance

York S1-SE-COM1001-0 Expansion Card 319825-402 When paired with a TW206The York S1 SE COM1001 0 Expansion Card is a critical communication interface designed specifically for the Simply SE Control System. This add on board functions as an isolated field bus expansion, providing the necessary hardware to bridge York HVAC equipment with sophisticated control networks and building automation systems (BAS). By utilizing a multi protocol architecture, the S1 SE COM1001 0 supports BACnet MS TP, Modbus RTU, and JCI N2, ensuring