RTU
When the system is in fan only mode, the supply fan runs continuously regardless of scheduled occupancy. Cooling or heating is off regardless of heating or cooling votes.
Zone Damper
The zone dampers adjust the zone temperature to meet the setpoints based on the temperature of the supply air being delivered during fan only mode.
Bypass damper
The bypass damper adjusts the duct static pressure to meet its setpoint. The bypass damper does not open to a value larger than the maximum bypass damper position.
Standby mode
All zone controllers support an occupancy sensor. If the occupancy sensor does not detect local activity, then after a set period of time the controller switches from occupied to standby mode. When in standby mode, the zone controller uses standby temperature setpoints that are higher and lower than the occupied cooling and occupied heating temperature setpoints. These standby setpoints save energy by reducing the demand for heating and cooling in an unoccupied zone. When VAV boxes are in standby mode, the application uses unoccupied flow setpoints in addition to standby temperature setpoints.
You can enable the occupancy sensor in the Control Setup screen in the Zone View of the SBH. You can set occupancy sensitivity and set the time that the unit goes into standby mode, at the sensor. Refer to the Verasys User’s Guide (LIT-12012371) for more information.