Regio Midi manual
Chapter 11
Fan control
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Chapter 11 Fan control
In controllers for fan control (…F-models) it is possible to control a fan at the following
speeds: Off, Low speed, Medium speed, High speed, Auto. The fan speed in the Auto position
depends on the controller output signal and the settings for each speed.
Fan speed control
Manual control
The fan can be manually controlled to work at any speed. On models with display, you press
the fan button once and a fan symbol is lit for 5 seconds in the display. As long as the symbol
is lit, you can change the fan speed by repeatedly pressing the fan button. Models without
display have a fan switch.
Figure 15. Fan button on models with display
Figure 16. Fan switch on models without display
The controller has the following positions:
Auto
=
Automatic control of the fan speed to maintain desired room temperature
0
=
Manual off
I
=
Manual position with low speed
II
=
Manual position with medium speed
III
=
Manual position with high speed
Manual setting of speed I-III means that the speed of the fan in operating modes Stand-by,
Occupied and Bypass is always the set speed. In the other operating modes, the fan is demand
controlled.
Auto control
In auto mode, you can configure if the fan should be controlled by the heating output, the
cooling output, or both the heating and cooling outputs. When the selected output exceeds the
start value that has been set for each speed (FS speed 1=20 %, speed 2=60 %, speed 3=100
%), the fan is activated. It stops when the controller output signal drops below the set value
minus the set hysteresis (FS=5 %).
When the fan speed changes, there is always a minimum delay (2-3 s) between the inactivation
of the output for the current speed and the activation of the output for the new speed. Only one
fan speed output is defined at a time.
Fan stopped
In operating modes Off and Unoccupied, the fan is stopped, regardless of the position of the
fan switch or the setting in the display, on condition that the temperature is within the set
temperature limits. If the temperature is not within the set temperature limits, the fan will be
started in the corresponding Auto position, regardless of the settings.