User Manual

Functions
Multifunctional input, digital input
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Input function
Description
Type
X1/X2/U1
U1, X1, X2
(Digital)
7
Monitor input (digital)
Digital input to monitor the state of an external
switch via bus
DI
U1, X1, X2
(Digital)
8
Monitor input
(temperature)
Sensor input to monitor the state of an external
sensor (e.g., NTC 3k) via bus.
AI
U1, X1, X2
(Temp.)
9
Supply air temperature
limitation
Sensor input to acquire supply air temperature.
The thermostat controls the room temperature via
built-in sensor. The control output (DC 0...10 V) is
reduced if the supply air temperature drops below
the min. limit or exceeds the max. limit (P063 ,
P064)
AI
Presence
detector
10
Presence detector
Presence detector input switches the
operating
mode to Comfort when the room is occupied and
returns to previous operating mode when the
room is unoccupied.
Presence detector is also possible via bus. In this
case, do not assign the function to local inputs
X1, X2 or U1. See also Presence detector [➙ 45].
DI
11
External temperature
limit
The sensor is connected to the pipe and
measures the temperature of the floor heating
water. When the value exceeds the selected limit
(P252), heating is stopped. See also Monitoring
and limitation functions [➙ 49]
AI
12
Coil temperature
To avo
id cooling flow air in the room, the sensor
measures the coil water temperature and
releases the fan only when the selected minimum
hot water temperature limit is exceeded (P366).
See also Fan control [➙ 90].
AI
Hotel
presence
detector
13
Hotel presence detector
Hotel presence detector input switches the
operating mode to Economy when the room is
unoccupied and symbol is displayed (buttons
are locked) and returns to previous operating
mode when the room is occupied.
Hotel presence detector is also possible via bus.
In this case, do not assign the function to local
inputs X1, X2 or U1. See also Presence detector
[➙ 45].
DI
● Control action can be changed from normally open (NO) and normally closed
(NC) via P151, P154 or P156.
● Each input X1, X2 or U1 must be configured with a different function (1…5 &
9…13). Exception: 1, 2 or 3 inputs can be configured as fault (6) or monitor
input (7,8).
● X1 is factory-set to "External sensor" (1), X2 to "Not used" (0), and U1 to
"Window contact" (3).
For more detailed information, see Application overview [➙ 37].
● For inputs X1, X2, or U1, one physical switch can be used for up to 20
thermostats (parallel connection).
Caution! Do not mix X1/X2 and U1.
● For sensors on inputs X1, X2, or U1, the maximum cable length is 80 m.
Note