Technical data

128
Function description – Vitocontrol-S, VD2/CT3/CM2
Cascade control (continued)
Control strategy example
Two boiler system with modulating burner:
Boiler 1: 100 kW rated output (basic load adjusted to 33 %, see page 96)
Boiler 2: 100 kW rated output (basic load adjusted to 33 %, see page 96)
Gross calorific strategy (coding 3C: 0)
Start-up Switching OFF
Net calorific strategy 1 (coding 3C: 1)
Start-up Switching OFF
5351 340 v1.4
Time
0
0
0
33
33
33
66
100
100
100
150
200
Total Boiler 2 Boiler 1
Rated output in kW
Time
0
0
0
33
33
33
66
100
100
100
150
200
Total Boiler 2 Boiler 1
Rated output in kW
Time
0
0
0
33
50
33
100
100
100
150
200
Total Boiler 2 Boiler 1
Rated output in kW
50
Time
0
0
0
33
50
33
100
100
100
150
200
Total Boiler 2 Boiler 1
Rated output in kW
50