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Engineering information and sizing the heat source
6 720 645 817 (2010/09)
37
Limit curves
Fig. 22 Limit curves for water treatment – single boiler
Fig. 23 Limit curves for water treatment – factory-prepared 2-boiler cascade
Key to Fig. 22 and Fig. 23:
A Above the curves, water treatment is required
B Below the curves, fill with untreated mains water that meets the requirements of the Drinking Water Order [Germany]
H
W
Water hardness
V Water volume over the total service life of the boiler
0
1
2
3
4
5
6
7
0 5 10 15 20 25 30
280 kW
240 kW
200 kW
160 kW
120 kW
6 720 643 417-14.1O
V/m
3
H
W
/°dH
B
A
6 720 643 417-15.1O
V/m
3
H
W
/°dH
0
2
4
6
8
10
12
14
16
0 5 10 15 20 25 30
560 kW
480 kW
400 kW
320 kW
240 kW
B
A
37


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