C
Divicon R 1¼ with mixer
D
Divicon R ¾, R 1 and R 1¼ without mixer
Heating circuit pumps regulated by differential pressure
According to the [German] Energy Savings Order (EnEV), circulation
pumps in central heating systems must be sized in accordance with
current technical rules. Circulation pumps in central heating systems
with rated output higher than 25 kW should be equipped and designed
in such a way that the power consumption will be automatically
matched to the operational (capacity) requirements in at least 3 stages,
if no safety concerns relating to the boiler make demands to the con-
trary.
In addition to the EnEV regulations, the use of regulated pumps is also
recommended for smaller capacities.
Design information
The use of differential pressure regulated heating circuit pumps
requires heating circuits with variable flow rate, e.g. single line and
twin-line systems with thermostatic valves, underfloor heating with
thermostatic or zone valves.
Wilo Stratos Para 25/1-7
■ Very economical HE pump (in accordance with Energy Label A)
Operating mode: Constant differential pressure
D
A
40
0
10
20
30
0
100
200
300
400
0
0.5
1.0
1.5
2.0
2.5
Pump rate in m³/h
Pressure drop/head mbar
kPa
50
500
60
600
3.0
3.5
4.0
70
700
B
C
Δp-C
max.
A
Divicon R ¾ with mixer
B
Divicon R 1 with mixer
C
Divicon R 1¼ with mixer
D
Divicon R ¾, R 1 and R 1¼ without mixer
Installation accessories
(cont.)
38
VIESMANN
VITOLADENS 300-W
/
VITOLADENS 333-F
4
5822 425 GB
