Secondary Circuit; Secondary Pump - Viessmann VITOCAL 300-G Technical Manual

Installation accessories

2.2 Secondary circuit

Secondary pump

Secondary pump (DHW and central heat-
ing)
Wilo standard circulation pump, type RS
25/6-3, 230 V~
(only for Vitocal with rated heating output up to
28.8 kW)
Secondary pump (central heating)
Grundfos, type UPS 25-60, 230 V~
Laing EC Vario 25/180 G (class B), 230 V~
Wilo standard circulation pump curves
6
5
4
3
2
1
0
0 1
Pump rate in m³/h
70
60
50
40
30
20
10
0
0 1
Pump rate in m³/h
Type RS 25/6-3, 230 V~
VITOCAL 300-G
(cont.)
Part no. 7338 850
Part no. 7338 851
Part no. 7374 788
2 3 4
max. (1)
(2)
min. (3)
2 3 4
Grundfos curves
6.0
3
5.0
2
4.0
3.0
1
2.0
1.0
0
0.0 0.5 1.0 1.5 2.0 2.5
Flow rate in m³/h
Type UPS 25-60, 230 V~
Laing curves
6
E6 vario
5
4
E4 vario
3
2
1
0
0.0 0.5 1.0 1.5
Flow rate in m³/h
Type E4/E6 Vario 25/180, 230 V~
6
5
4
3
E4 auto
2
1
0
0.0 0.5 1.0 1.5
Flow rate in m³/h
Type E4/E6 Auto 25/180, 230 V~
UPS 25-60
3.0 3.5 4.0 4.5 5.0
2.0 2.5 3.0
E6 auto
2.0 2.5 3.0 3.5
VIESMANN
2
17