Viessmann VITOCROSSAL 200 Type CM2 Technical Manual page 33

Design information
30
25
20
15
1
10
5
10
0
120 140 160
Required total draught in Pa for the burner selection
(boiler and flue pipe)
System size DN 200
1 Measured from the height of the flue outlet on the boiler to the top
edge of the flue system.
30
25
20
15
1
10
5
0
160 180 200
Required total draught in Pa for the burner selection
(boiler and flue pipe)
System size DN 250
1 Measured from the height of the flue outlet on the boiler to the top
edge of the flue system.
Assumptions:
■ Length of the connection piece 2 m
■ 3 bends with 87° (including support bends)
■ Diameter of the connection piece DN 200
Example:
Vitocrossal 300 with 314 kW; height of the flue pipe 16 m. The following
diagram illustrates how to read the required total draught (boiler and
flue system) from the above diagram.
Gas condensing boilers
(cont.)
25 45
40
20
30
20
40
180 200 220 240
220 240 260 280
90
80
70
60
90
80
50
70
60
260 280 300
300 320 340
8
VIESMANN
33