Zone
Zone DOA
The Zone DOA will deliver conditioned outside air directly to a zone. Each zone on a system with a Zone DOA will have its own individual DOA unit.
Zone Neutral Control
The Neutral Temperature DOA will conditioned the outside air to zone neutral conditions. The DOA will attempt to minimize the ventilation load on the zone by delivering air at the same setpoint conditions as the zone.
Zone Temperature Control
The Temperature Control DOA will deliver ventilation air at a heating temperature setpoint, cooling temperature setpoint, or within the deadband between the cooling and heating temperature setpoints.
Single System DOA
The Single System DOA will deliver conditioned outside air at the system level. One DOA unit will serve all of the zones assigned to one particular system. The conditioned outdoor air will be delivered to the system just before the main system coils.
If the system is a zone level system such as a packaged terminal air conditioner (PTAC), each zone on that system will get its own PTAC. When a Single System DOA is used, one DOA will serve each of the PTAC units.
System Cool/Heat
A DOA unit conditions ventilation airflow to the user entered cooling and heating supply air dry bulb temperature. The air is delivered at the system level to one system.
System Dehum/Cool or Heat
A DOA unit delivers conditioned outdoor air at a user-specified low humidity ratio dehumidifying the supply airflow without reheating it. The air is delivered at the system level to one system.
System Dehum and Reheat
A DOA unit delivers conditioned outdoor air at a “neutral” temperature by dehumidifying the outdoor air to a user-specified low humidity ratio and then reheating it to a user-specified dry bulb that is near the room temperature. The air is delivered at the system level to one system.
