System and method for controlling a multi-zone dual deck air handling unit

A system for controlling a multi-zone dual deck air handling unit comprising:

• an input component configured to receive an outside air temperature of the air handling unit and a plurality of zone demands associated with a plurality of zones, each zone demand corresponding to a particular zone of the plurality of zones;
• an output component configured to communicate with a plurality of zone dampers and at least one of a cooling deck or a heating deck of the air handling unit;
• and
• a processor coupled to the input and output components, the processor directing the output component to:
• engage at least one of the cooling deck or the heating deck in response to the outside air temperature and the plurality of zone demands;
• determine whether a request for heating or cooling marginally exists, perform a load shift test during a delay period, and determine whether a need for the request remains after the delay period;
• position the plurality of zone dampers associated with the plurality of zones based on the plurality of zone demands in response to engaging the cooling deck and the heating deck concurrently and determining that the need for the request remains after the delay period, each zone damper of the plurality of zone dampers being position at either a maximum cooling position or a maximum heating position;
• and
• modulate the plurality of zone dampers associated with the plurality of zones based on the plurality of zone demands in response to engaging the cooling deck or the heating deck distinctly.