5
Functions of the heating circuit
Which controller functions are available depends on the selected system code number (Anl).
5.1
Weather-compensated control
When weather-compensated control is used, the flow temperature is controlled according to
the outdoor temperature. The heating characteristic in the controller defines the flow temper-
ature set point as a function of the outdoor temperature (–> Fig. 5). The outdoor temperature
required for weather-compensated control can either be measured at an outdoor sensor or
received from a connected device bus.
Functions
WE
Configuration
Outdoor sensors AF1/2
1
CO1, 2 -> F02 - 1
If you wish to alternatively receive the outdoor temperature via the device bus, the following
additional configurations must be made:
Device bus
0
CO7 -> F01 - 1; device bus address
Receive value AF1
0
CO7 -> F07 - 1; register no.
Receive value AF2
0
CO7 -> F09 - 1; register no.
EB 5576 EN
49
Functions of the heating circuit
130
120
110
100
90
80
70
60
50
40
30
20
20
16
12
8
4
0
-4
-8
-12
-16
-20
2.4
3.2
2.9
2.6
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.4
0.2
[
˚
C]
[
˚
C]
t
VL
t
A
Fig. 5 · Gradient characteristics
t
VL
Flow temperature
tA
Outdoor temperature
