KNX Technical Reference Manual
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18 | 0073-1-7388 | KNX Technical Reference Manual
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Fan coil, general
The ventilation convectors, also called fan convectors or fan coil units, are used for decentralized heating and cooling. They
are installed in the room and supplied via a central heating and cooling system. There are two-pipe and four-pipe systems.
There are multi-stage ventilators within a fan coil unit that enable fast adjustment to the room temperature to be made
according to individual requirements. The fan coil room thermostat with display can activate up to three fan stages either
manually or automatically.
The fan stages can be activated in three ways:
• via 1-bit values,
i.e., a 1-bit communication object "Fan coil stage ... switching" is made available for each fan stage. This required for
"normal switch actuators. ((When using KNX switch actuators and fan coil units, the connecting instructions for the fan coil
unit are to be observed).
• via 1-byte object as numerical value 0-3,
i.e. there is a 1-byte communication object "Fan stage manual 1 byte" which is connected with a corresponding
communication object of a fan coil actuator. Here the value 0 = OFF 1 = stage 1 2 = stage 2 3 = stage 3
• via 1-byte object as constant value 0-100%,
i.e. there is a 1-byte communication object "Fan stage manual 1 byte" which is connected with a corresponding
communication object of a fan coil actuator. During manual stage switchover the stage threshold values that are set on tab
heating or cooling are sent out. In heating mode the threshold values for heating, in cooling mode the threshold values for
cooling. To ensure that the fan coil unit switches the fan stages, the parameters of the associated fan coil actuator must be
set accordingly.
Via parameter "Evaluate fan stage status byte" a 1-byte communication object "Fan coil operating state", which is connected
with a corresponding object of a fan coil actuator, can be enabled. This allows the fan coil room thermostat evaluate which
fan stage is actually active on the fan coil actuator. The display corresponds to the value of the communication object (0 =
OFF, 1 = stage 1, 2 = stage 2, 3 = stage 3).
The parameter "Evaluate operation status byte" activates a 1-bit communication object "Receive during operation - actuator
monitoring". Cyclical telegrams from the fan coil actuator can be received and evaluated on this object. This allows the room
thermostat to check whether the fan coil actuator is still operating and can be activated. If the fan coil actuator has a problem
and can no longer send cyclical telegrams, the room thermostat will indicate this on the display with the "Error" symbol. If the
error on the fan coil actuator has been rectified and cyclical telegrams can be received, the "Error" on the display is removed
and the room thermostat will again function as "Normal".
The cycle time setting "In operation" in the fan coil actuator should be selected at least twice as large as the monitoring time
in the room thermostat ("Sending cycle time of actuator in sec."). A practical cycle time for the actuator is approximately 60
seconds with a monitoring time of 120 seconds for the room thermostat.
To prevent an excessive noise level in hotel rooms during the silent period in the night, a "Stage limitation for night mode"
can be set. This means that during night mode only the fan stage that has been set is automatically switched to. All fan
stages can be activated again when changing to a different operating mode.
Parameter "Stage limitation for night mode" can be used to set a limit to "Stage 2" or "Stage 1" or the ventilation can be
completely deactivated.
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Compensation
The fan coil room thermostat with display has the two compensation types, summer and winter compensation. Each is
explained in greater detail in the following.
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Содержание Busch-priOn Series
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