• Heating or cooling mode
• Field-selectable jumper
• Adjustable differential
• Offset 5-pin connector

Multiple staging of boilers or chillers staging of refrigeration compressors, multiple fan staging for cooling tower

Using a Y350R, up to nine S350As can be added to the A350, A350E, and A350R via the 5-pin, plug-together connector. Using a Y350R with an A350P, up to four S350As can be added. Using a 40 VA or greater external transformer with an A350P, up to nine S350As can be added.