Viessmann Vitotronic 100 GC1 Installation And Service Instructions Manual page 111

Cascade control
(cont.)
Control strategy example
Two boiler system with modulating burner:
Boiler 1: 100 kW rated output (basic load adjusted to 33 %, see page 78)
Boiler 2: 100 kW rated output (basic load adjusted to 33 %, see page 78)
Gross calorific strategy (coding 3C : 0)
Start-up
100
66
33
0
100
33
0
200
150
100
33
0
Net calorific strategy 1 (coding 3C : 1)
Start-up
100
50
33
0
100
50
0
200
150
100
33
0
Switching OFF
100
66
33
0
100
33
0
200
150
100
33
0
Time
Switching OFF
100
50
33
0
100
50
0
200
150
100
33
0
Time
Function description – Vitotronic 300-K, MW1S
Time
Time
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