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7.4.3
Minimum distance
The adjustable parameter "minimum distance between heating and cooling" is enabled with both dependent and
individual setpoints.
The minimum distance is always between "heating setpoint comfort mode" and "cooling setpoint comfort mode".
It acts as a buffer zone to prevent the two setpoints from overlapping.
Example:
Individual setpoints are selected. "Heating setpoint comfort mode" is set to 21 °C and "cooling setpoint comfort
mode" is set to 26 °C. The dead zone between heating and cooling is 3 K. If the heating setpoint is moved up, the
dead zone is also moved up. If the adjustment exceeds a temperature of 23 °C, "cooling setpoint comfort mode" is
also adjusted up to ensure that there is always a minimum distance of 3 K between heating and cooling.
If the cooling setpoint is moved down, the dead zone is also moved down.
If the adjustment exceeds a temperature of 24 °C, "heating setpoint comfort mode" is also adjusted down to ensure
that the minimum distance is also retained in this case.
7.4.4
Fan Coil general
Ventilator convectors, also referred to as blower convectors or fan coil units, are used for decentralised heating and
cooling. They are mounted in the room and supplied by a central heating and cooling system. A distinction is made
between 2-pipe and 4-pipe systems (see also page 63, Section 7.3 Controller). A fan coil unit has multi-stage fans
that enable fast adjustment of room temperature as required by the user. The Fan Coil ambient temperature controller
with display can actuate up to three fan stages manually or automatically.
The fan levels can be actuated in three ways:
- with 1-bit values,
i.e. a separate 1-bit communication object "fan coil stage ... switch" is available. This is required for "normal"
switching actuators (if KNX switching actuators and fan coil units are used, note the connection instructions of
the fan coil unit.)
- with a 1-byte object as count value 0-3,
i.e. there is a 1-byte communication object "fan stage manual 1 byte", which is linked to a corresponding
communication object of a fan coil actuator. Here the values are 0 = OFF
1 = stage 1
2 = stage 2
3 = stage 3
- with a 1-byte object as continuous value 0-100%,
i.e. there is a 1-byte communication object "fan stage manual 1 byte", which is linked to a corresponding
communication object of a fan coil actuator. When a stage is manually switched, the stage fast values are
transmitted, which are set on the heating or cooling tab. In heating mode the fast values for heating, in cooling
mode the fast values for cooling.
The parameters of the fan coil actuator must be appropriately configured to ensure that the fan coil unit also
switches the fan stages.
When adjusting the cycle time "in operation" in the fan coil actuator, note that it must be at least twice as large as the
monitoring time in the ambient temperature controller ("send cycle time of actuator in s"). A reasonable cycle time
for the actuator is approx. 60 s with a monitoring time of 120 s in the ambient temperature controller.
For example, to prevent excessive noise during the night in hotel rooms, a "stage limitation in night mode" can be
set. This means that only the specified fan stage or lower will be used in night mode. When switching to another
operating mode all fan stages can still be used.
A limitation can be set to "stage 1" or "stage 2" or the fan can be completely disabled with the parameter "stage
restriction in night mode".
Planning and use
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Building Automation | Planning and use 75
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