MAXinBOX FC 0-10V VALVE
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34
2.5.3
FAN
The fan speed control of the fan coil module may be
manual
(the fan speed will be
controlled externally; for instance, by the user) or
automatic
.
Under the automatic fan speed control, the fan speed will be controlled by the module
itself.
This is done according to
up to four threshold values
(depending on the
number of available fan speeds), set by the integrator. This threshold values define the
range of the ICS that will correspond to each available fan speed. In other words, the
integrator must define
which fan speed
should be adopted while in the automatic
mode
depending on the current value of the ICS
. A
hysteresis
can also be defined,
to prevent continuous fan speed switchovers in case the ICS keeps moving around one
of the threshold values.
The integrator can configure if the user (from a control interface) can
switch from one
mode to another
or, on the contrary, if only one of the two modes will be available.
When both, the manual and the automatic control modes are permitted, a
communication object will let
switching from one control mode to the other
, while
the corresponding status object will reflect the current mode.
In addition, the integrator can configure:
Whether the reception of manual fan speed orders while in the automatic
mode should
make the fan control switch to manual mode
or not.
A period of time so that,
in the absence of manual speed orders
during
such time, the fan speed control switches to automatic.
Whether the fan speed control should switch to automatic whenever the
heating / cooling mode changes
.
Apart from the fan speed control modes, this configuration involves the following
options:
The
minimum fan speed
permitted in manual mode while the valve is open.
This must be configured for each of the valves. Please note that, to prevent
damage to the installation,
speed 0 (fan off) is never available in manual
