Wilo Para MAXO Notice De Montage Et De Mise En Service page 70

en Description and function
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 de-
creasing volume flow in the pipe network. Electrical 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 network 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.
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H
H max
Hs
1
/ Hs
2
H min
H
H max
Hs
H min
Q
Q
WILO SE 2022-04