Boiler circuit
The circulation pump in the Vitoladens must be able to supply the
required water volume against the (mostly low) pressure drop of the
boiler circuit; the pressure drop of the low loss header is negligible.
Subject to the water volume circulating in the generator circuit, the
respective residual head may be determined for the sizing of the inter-
nal pipe diameters using the pump diagram; alternatively the variable
speed pump can be adjusted accordingly.
Heating circuit
The central heating pumps to be installed on site must be able to
deliver the water volume in the heating circuits against their pressure
drop; size the pumps accordingly.
Principle of operation
T1
T3
T2
T4
Vsecondary
Vprimary
V
primary
Heating water volume in the boiler circuit (approx. 10 -
30 % less than V
secondary
)
V
secondary
Heating water volume heating circuit
T
1
Flow temperature boiler circuit
T
2
Return temperature boiler circuit
T
3
Heating circuit flow temperature
T
4
Heating circuit return temperature
Q
primary
Amount of heat supplied by the boiler
Q
secondary
Amount of heat transferred by the heating circuit
V
primary
< V
secondary
T
1
> T
3
T
2
≃
T
4
Q
primary
= Q
secondary
Note
Suitable thermometers in the flow and return of the low loss header
make adjustments easier.
Low loss header in conjunction with Divicon
For further information, see page 31.
Max. flow rate
in m
3
/h
Low loss header
– R ¾
4.5
– R 1
4.5
– R 1¼
7.5
Divicon heating circuit distributor
– R ¾
1.0
– R 1
1.5
– R 1¼
2.5
HR
HV
120
120
599
267
428
816
C
B
A
HR Heating return
HV Heating flow
HR
HV
120
120
790
267
428
816
120 180
180
HR Heating return
HV Heating flow
Low loss header from the Vitoset range
See "Vitoset" pricelist
Design information
(cont.)
56
VIESMANN
VITOLADENS 300-W
/
VITOLADENS 333-F
5
5822 425 GB
