Art. No. SC 1000 KNX
offset for the fan. The fan controller always adds the configured offset to the command value to
be evaluated. The effect of this is that the fan turns at greater power then required by the
command value, according to the threshold values. The result of this is that, even if the
command value is switched off, the fan will continue to work when the first command value
threshold value is exceeded by the offset.
i
A configured command value offset cannot not affect a command value of greater than
100%. The maximum command value of the fan controllers is therefore defined as 100 %.
Fan protection
The fan protection function allows the fan of a fan coil unit, which has not been active for some
time, to be temporarily switched to the maximum level. In this way, the controller fan motors can
be protected against stiffness. In addition, the fan blades and the heat exchanger of the fan coil
unit are protected against dust against dust.
If the fan protection is to be used, it must be enabled using the parameter of the same name in
the ETS. Fan protection can then be activated or deactivated directly using the
1-bit communication object "Ventilation, fan protection", for example using a KNX/EIB time
switch.
If the fan protection object has the switching value "1", then the fan protection function is active.
The fan then works at the highest possible fan level and overdrives automatic and manual
operation. Fan protection can then be switched off again using the "0" switching value in the
communication object.
The reaction of the fan to switching fan protection depends on the operating mode of the
automatic fan system. In automatic operation, the fan switches back to the level determined by
the command value of the room temperature control. In manual operation, the fan switches off
and can then be switched on again by additional manual actuation. The "Start-up via level"
parameter is taken into account here.
i
Even if the fan controller is inactive due to the controller operating mode, it is possible to
activate the fan using fan protection.
i
With an active level limit, the maximum fan level of fan protection is specified by the limit
level.
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For reasons of safety, fan protection is not carried out with an active forced position.
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If fan run-on times are configured in the ETS, then the fan is switched off after a delay
when fan protection is deactivated.
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Software "Smart Control 501511"
Functional description