
The fan boost function is enabled by configuring the
Fan boost time
setting to a value that is greater than zero.
The fan boost function is activated when presence is detected, see section
, or when the controller
changes to bypass state, see section
. The fan boost time is independent of the
Time in bypass state
configuration setting.
When the fan boost function is active, the fan runs at maximum speed for the first 10 seconds of the fan
boost time. For the remainder of the fan boost time, the fan speed output signal corresponds to whichever of
the fan boost or temperature control signal that has the greatest value.
After the fan boost time has expired, the fan speed output signal corresponds to the temperature control
signal, regardless if the fan boost control signal is greater than the temperature control signal. That is, the
controller reverts to normal fan control, which is either auto or manual mode.
The fan boost configuration settings are described in
.
Table 2-19 Fan boost configuration settings.
Configuration setting
Description
Fan boost mode
At cooling demand:
Fan boost is active at cooling demand.
At heating demand:
Fan boost is active at heating demand.
At heating and cooling demand:
Fan boost is active at both heating and cooling demand (default
setting).
Fan boost time (sec)
The period of time (in seconds) that the fan boost function is active.
illustrates how the fan boost function can be used to provide a perceived cooling effect until the
cooling distribution from the cooling valve establishes.
In this example, the control behaviour for an EC fan in auto mode is described. It is assumed that the room
temperature is 28 °C and the cooling setpoint is 24 °C at 0 seconds, resulting in an error value of 4, and that
the error value is reduced to 0 at 300 seconds. The fan boost time is set to 90 seconds. The P-band for the fan
boost controller is set to 5 °C, and the P-band and I-time for the temperature controller is set to 10 °C and
300 seconds, respectively.
36
Regio
Ardo
manual, Rev. D