TRG-TRC014-EN 49
period three
System Configurations
notes
In a typical commercial building, the occupied mode occurs during daytime
operation. The building must be ventilated and the comfort cooling or heating
temperature set points must be maintained in all occupied zones.
The occupied mode is characterized as follows:
n The main supply fan operates continuously.
n The primary air temperature is controlled to a constant set point.
n The supply fan is controlled to maintain the static-pressure set point of the
system.
n The outdoor air damper is controlled to deliver the proper amount of
ventilation air.
n All terminal units are controlled to maintain their respective occupied space
temperature set points.
Occupied Mode
▲ Main supply fan operates continuously
▲ Constant primary-air set point
▲ Main supply fan controlled to maintain the
system static-pressure set point
▲ Outdoor air damper delivers proper amount of
ventilation air
▲ Terminal units maintain respective “occupied”
space thermostat set points
Figure 68
