H Sizing The Circulation Pump - Viessmann Vitosol
100 Technical Manual

Sizing the circulation pump
If the throughput and pressure drop of
the entire system are known, the pump is
selected on the basis of the pump
characteristics.
Variable−speed pumps which can be
matched to the system by switching are
the most suitable.
To simplify the installation and selection
of the pumps and safety equipment,
Viessmann supplies the Solar−Divicon.
The Solar−Divicon comprises:
H Pre−assembled and sealed valves and
safety assembly,
H Flow regulating valve to control the
solar heating system during
commissioning and operation,
H Integral check valves.
Solar Divicon
60 60
40 40
80 80
20 100 20 100
0 120 0 120
250
A Safety assembly/diaphragm expansion vessel
VITOSOL
3.2 Sizing pipe diameters and circulation pump
A Solar−Divicon and a solar pump line are
required for systems with a second pump
circuit or with a bypass circuit.
If, on systems with a bypass circuit, the
solar pump line is to be positioned to the
r.h. side of Solar−Divicon, its pump acts as
the circulation pump for the bypass
circuit and that of the solar pump line as
the solar circuit pump. In this case, the
safety assembly is installed on the solar
pump line (see extension plan B).
For high flow, we recommend the
following:
Type PS 10 or type P 10
2
up to 20 m aperture area
Vitosol 100, 200, 250 and 300,
Type PS 20 or type P 20
H Up to 50 m
2
aperture area with
Vitosol 100
H Up to 36 m 2
aperture area with
Vitosol 200, 250 and 300.
Solar pump line
A
Note
The Solar−Divicon and the solar pump
line are not suitable for direct contact
with swimming pool water.
Always install Solar−Divicon at a lower
height than the collectors to prevent
steam from entering the expansion vessel
in the event of stagnation.
For systems which are installed in the
roof space or involve short pipe lengths, a
preliminary vessel should be provided if
necessary.
60
40
80
20 100
0 120
208
51