KNX Technical Reference Manual
Busch
-
priOn
®
14 | 0073-1-7388 | KNX Technical Reference Manual
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Controller
The room thermostat can be used exclusively for heating, exclusively for cooling or for heating and cooling.
If the room thermostat is to heat or cool, the switchover from heating to cooling or cooling to heating can occur automatically
by means of the room thermostat. The controller detects automatically whether a control value for heating or cooling is to be
sent out. If the automatic switchover is not required, the switchover between heating and cooling can take place by means of
an external, central control via the 1-bit object "Switchover heating/cooling". In this setup, the heat and cooling icons are
continuously displayed in the respective mode. The object is enabled via parameter "Switchover between heating/cooling".
The control value for heating and/or cooling can be sent out on a common communication object "Heating/cooling control
value" or on two individual communication objects "Heating control value" and "Cooling control value". If a common object is
used, it may be necessary to inform the actuator whether the control value is for heating or cooling. For this, a 1-bit
communication object "Switchover heating/cooling" can be enabled via parameter "Switchover between heating and cooling"
with setting "Automatic and sending". For activation of heating operating mode a "1" is sent to the bus, for activation of
cooling mode a "0".
A common communication object for heating and cooling is required to activate two two-pipe systems, i.e., the same pipeline
is used for heating and cooling. Two single communication objects are used for four-pipe systems. Heating and cooling each
have their own pipeline system.
Parameter "Number of output channels" specifies whether an object ("1 channel (two-pipe system) for heating and cooling")
or two objects ("2 channels (four-pipe system) for heating and cooling") are to be displayed.
Separate control types can be configured each for heating and cooling. One of the following control types can be selected:
• 2-point
• PWM
• Continuous
• Fan coil
The individual control types are described in greater detail in the following.
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2-point controller
A 2-point controller has two output states that alternate in dependence of the actual value. If the actual value is above the
parameterised setpoint, control value "0" is sent on the bus. If the actual value is below the parameterised setpoint, control
value "1" is sent.
A 2-point controller should be used when the control value is to alternate only between the two states ON and OFF, such as
an electrothermal valve that is connected to a switch actuator, for example. A 2-point controller can quickly correct control
variations in case of large changes in the control variable, but never comes to rest.
To avoid rapid oscillations of the output states, the 2-point controllers always have a built-in hysteresis that varies around
the setpoint. The hysteresis can have different size parameters. For example, if the setpoint during heating mode is 21 °C
and the hysteresis is 1.0 K, the controller switches on when the value falls below 20.5 °C and switches off again when
exceeding 21.5 °C. The "Hyteresis" parameter to be set, on the one hand responds to how quickly the heating can heat the
room or how quickly the air-conditioning cools the room, and on the other hand to the desired temperature of the people in
the room. The hysteresis should not be set too small, otherwise the switching actuator will constantly open and close. The
hysteresis should also not be set too large, otherwise the temperature fluctuations in the room will be too large.
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Содержание Busch-priOn Series
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