LX Series Unit Ventilator Controller User's Guide48
If the fan option Always On in occupied mode is selected and the occupancy status
is OC_OCCUPIED or OC_BYPASS, the first fan speed is ON. Otherwise, the first
fan speed starts according to a cooling or heating demand.
Fan speeds two and three are controlled by a cooling and heating demand.
However, heating outputs and cooling outputs must be configured so these fan
speeds can start.
Fan speeds two and three are used to increase cool or hot air volume in the room.
For example, during a heating demand, it would not be appropriate to increase the
air volume if the discharge air is not reheated. This situation creates discomfort for
room occupants as they receive colder air.
The minimum time that any fan speed must be ON before it turns OFF, and the
minimum time that any fan speed must be OFF before it turns ON, are both set in
the Fan-Valve screen of the UVC configuration wizard. Enter a value in the ON/
OFF period box on that screen. See Figure 17.
Terminal Load
Terminal load describes the energy consumption of a Unit Ventilator Controller for
both heating and cooling operations. The effect of the economizer damper may be
included or excluded from the terminal load on the General Settings screen. The
network variable nvoTerminalLoad transmits the terminal load of the controller
over the network.
Figure 17: Fan-Valve Screen of the Unit Ventilator Controller
Configuration Wizard
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