Viessmann Vitotronic SPS Service Instructions Manual page 28

Configuring the system
System parameters
Examples
260
240
220
200
180
160
140
120
100
80
60
40
20
0
0 1 2 3
Fig. 19
Example
Set temperature
(heating water buffer
cylinder)
D
Output controller fac-
tor
B
Actual temperature
C
Condenser spread
A
Set output
E
Explanation
Examples 1 to 4:
The set output falls because the actual temperature is
approaching the set temperature.
Examples 5 and 6:
The set output rises because the output controller fac-
tor has been adjusted.
Examples 7 to 9:
The set output changes because the condenser
spread changes.
Examples 9 and 10:
28
(cont.)
4 5 6 7
1 2
°C 50 50 50
15 15 15
°C 40 42 44
K 2.0 2.0 2.0
% 165 135 105
8 9 10 11
3 4 5 6
50 50 50
15 30 60
46 46 46
2.0 2.0 2.0
75 135 255
The set output changes because the output controller
factor changes.
Examples 10 and 11:
The set output changes because the differential
between the set temperature and actual temperature
changes.
General:
The condenser spread is effective only if the spread is
no greater than 2 K. If the spread is less than 2 K in
the condenser, the set output is reduced. Where the
spread is greater than 2 K, the set output is deter-
mined from the temperature at the condenser re-entry.
7 8 9
50 50 50
15 15 15
46 46 46
1.0 0.5 2.0 2.0
60 52.5 75
10 11
50 50
5 5
46 40
2.0
35 65