User Manual

Functions
Multifunctional input, digital input
4
88 | 146 A6V11545892_en--_a
Fan control is set to enable by default (P350 = 1), if the thermostat is set with
control sequence “H/C ceiling with PICV and 6-port ball valve as changeover”. For
this application, where the combi valve PICV controls the flow rate and the 6-port
ball valve works as changeover heating / cooling, the fan control can:
● also be disabled (P350 = 0)
● run only in heating (P350 = 2) sequence
● run only in cooling (P350 = 3) sequence
Only DC fan control is available at output Y50 for this application.
4.10 Multifunctional input, digital input
The thermostat has 3 multifunctional inputs X1, X2 and U1. Input U1 will be
configured as digital input in later product version.
An NTC type sensor like NTC 3k, a LG-Ni1000 (AI, analog input) or a switch (DI,
digital input) can be connected to the input terminals. The functionality of the inputs
can be configured via P150 + P151 for X1, P153 + P154 for X2, and P155 + P156
for U1.
The current temperature or state of the inputs X1/X2 and U1 is available on bus for
monitoring purposes.
The parameters can be set to the following values:
# Function of input Description
Type
X1/X2/U1
0 Not used No function --
1
External/return air
temperature
Sensor input for external room temperature
sensor or return air temperature sensor to acquire
the current room temperature.
AI
Heating/
cooling
changeover
2
Heating/cooling
changeover
Sensor input for "Automatic heating/cooling
changeover" function.
A switch can also be connected rather than a
sensor.
Important: Switch status is configured via P151,
P154, P156. See also Additional functions [➙ 41].
Heating/cooling changeover is also possible via
bus. In this case, the function must not be
assigned to any local input X1, X2, U1. See also
Additional functions [➙ 41].
Diagnostic value 0 ˚C is displayed for closed
contact/100 ˚C for open contact, if a switch is
connected.
AI/DI
Window
contact
3 Window contact
Digital input to switch over the operating mode to
Protection.
If the window contact is active, user operations
are ineffective and OFF is displayed.
Window contact is also possible via bus. In this
case, do not assign the function to any local input
X1, X2 or U1. See also Operating modes [➙ 23].
DI
Fan operation with combi
valve PICV and a 6-port
ball valve as changeover