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Functions
4
Multifunctional input, digital input
Example
Fan operation with combi
valve PICV and a 6-port
ball valve as changeover
4.10 Multifunctional input, digital input
#
Input function
0
Not used
1
External/return air
temperature
2
Heating/cooling
changeover
Heating/
cooling
changeover
112 | 180
Function for On/Off control outputs is listed as per the following figure:
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, fan control can:
●
Also be disabled (P350 = 0)
●
Run only in heating (P350 = 2) sequence
●
Run only in cooling (P350 = 3) sequence
For this application, only DC fan control is available at output Y50.
The thermostat has 3 multifunctional inputs X1, X2 and U1. Input U1 will be
configured as digital input in a future 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 the bus
for monitoring purposes.
The parameters can be set to the following values:
Description
No function
Sensor input for external room temperature
sensor or return air temperature sensor to acquire
the current room temperature.
Sensor input for "Automatic heating/cooling
changeover" function.
A switch can also be connected rather than a
sensor.
Important: Switching state configured via P151,
P154, P156. See also Additional functions
[➙ 47].
Heating/cooling changeover is possible via bus.
In this case, the function must not be assigned to
local inputs X1, X2, U1. See also Additional
functions [➙ 47].
Diagnostic value 0 ˚C is displayed for closed
contact, 100 ˚C for open contact, if a switch is
connected.
Type
X1/X2/U1
--
AI
AI/DI
A6V11545892_en--_c
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