Wilo Stratos PARA-C Notice De Montage Et De Mise En Service page 47

6.2 Control and communication functions
Variable differential pressure Δp-v
Recommended for two-pipe heating systems with radiators to reduce the flow noise at thermostatic valves.
The pump reduces the delivery head to half in the case of decreasing volume flow in the pipe network. Elec-
trical energy saving by adjusting the delivery head to the volume flow requirement and lower flow rates.
Constant differential pressure Δp-c
Recommended for underfloor heating or for large-sized pipes or all applications without a variable pipe net-
work curve (e.g. storage charge pumps) as well as single-pipe heating systems with radiators. The control
keeps the set delivery head constant irrespective of the pumped volume flow.
Constant speed
Recommended for systems with fixed system resistance requiring a constant volume flow. The control keeps
the set speed constant, irrespective of the pumped volume flow.
Installation and operating instructions • Wilo-Stratos PARA-C/-CZ • Ed.01/2023-04
H
H max
Hs
1
/ Hs
2
H min
H
H max
Hs
H min
H
n s
n min
Q
Q
n max
Q
en
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