Viessmann VITODENS 200-W Technical Manual page 12

Vitodens 200-W
Residual head of the circulation pump
120 1200
1
110 1100
100 1000
90 900
80 800
70 700
60 600
50 500
40 400
30 300
20 200
10 100
0 0
0
Flow rate in l/h
A Stage 1
B Stage 2
C Stage 3
Note
Observe further details regarding the use of a low loss header (see
page 35).
If the residual head of the circulation pumps (available as accessories)
is insufficient to overcome the following system pressure drop values,
install an additional, external circulation pump on site.
In such cases, use a low loss header.
Pressure drop (primary circuit)
For sizing a circulation pump on site (when connecting to DHW cylinder
from connection set)
60 600
50 500
400
40
30 300
20 200
10 100
0 0
0 1000
Flow rate in l/h
VIESMANN
12
(cont.)
1000 2000
2000 3000 4000
A
3000 4000
5000 6000 7000
C
B
5000 5000 6000
VITODENS 200-W