6
Functions
Functions and parameters are entered in the TROVIS-VIEW Operator Interface separately for
level #1 and level #2 (see section 7).
6.1
Outdoor temperature compensated control
In the outdoor temperature compensated control, the flow temperature (t
VL
) is automatically
adjusted in relationship to the outdoor temperature (t
A
). The heating characteristic in the con-
troller defines the set point for flow temperature as a function of the outdoor temperature
(Fig. 10).
Basically, the following correlation exists: If the outdoor temperature drops, the flow temper-
ature rises. By varying the
Gradient and Level parameters, the characteristic can be adapted
to individual requirements: An increased
Gradient causes an increase in flow temperature,
whereas a reduced
Gradient causes a lower flow temperature. The Level parameter shifts the
heating characteristic parallel upwards or downwards.
In reduced operation, the flow temperature is reduced by the amount set in
Flow temperature
set-back in reduced operation. The Max. flow temperature and Min. flow temperature pa-
rameters limit the flow temperature range.
Return flow temperature limitation
(see section
6.5) is an exception as it can reduce the flow temperature without restriction down to 20 °C
flow temperature set point.
EB 5757-7 EN
17
Functions
20
30
0.2
2.4
2.6
2.9
3.2
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.4
0.6
40
50
60
70
80
90
100
110
120
130
t
VL
[
˚
C]
-20
[
˚
C]
t
A
-16
-12
-8
-4
0
4
8
12
16
20
Fig. 10 · Heating characteristics
t
VL
Flow temperature
t
A
Outdoor temperature