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Chapter 11
Fan control
Regio Midi manual
Fan boost function
If there is a great difference between the room setpoint and current room temperature, or if one
simply wishes to hear the fan start, a boost function can be activated to make the fan run at top
speed for a set duration. An extra controller is then running in the background, using a P-band
for fan control separate from that of the ordinary controller. The controller with the highest
value will be outputted to the fan. The P-band is fixed and cannot be changed. When this
function is active, the fan will initially run at full speed for 10 s and then decrease to the speed
set by the extra controller for the remainder of the time set for the boost function.
The boost function has a higher priority than the manually set fan speed.
Fan kickstart
When using today’s energy-saving EC fans, there is always a risk the fan will not start due to
the low control voltage preventing the fan from exceeding its starting torque. The fan will
then remain at a standstill while power still flows through it, which may give rise to damage.
The kickstart function ensures fan output is set to 100 % for a set time (1...10 s) thereby
making sure the starting torque is exceeded. Kickstart is activated when the lowest fan speed
is selected. The function is also active during manual fan control. After the set time (1-10 s)
has elapsed, the fan will return to its original speed.
