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Operating button
Control modes and functions
Variable differential
pressure Δp-v
(I, II, III)
H/m
III
II
Constant differential
pressure Δp-c
(I, II, III)
III
H/m
II
Press
Select control mode
• Select pump curve (I, II, III) within the control mode
Press and hold
• Activate the pump venting function
(press for 3 seconds)
• Activate manual restart (press for 5 seconds)
• Lock/unlock button (press for 8 seconds)
Recommended for two-pipe heating systems with radi-
ators 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.
Electrical energy saving by adjusting the delivery head
to the volume flow requirement and lower flow rates.
There are three pre-defined pump curves (I, II, III) to
choose from.
Recommended for underfloor heating or for large-sized
Q/m³/h
pipes, applications without a variable pipe network
curve (e.g. storage charge pumps) or
single-pipe heating systems with radiators.
The control keeps the set delivery head constant irre-
spective of the pumped volume flow.
There are three pre-defined pump curves (I, II, III) to
choose from.
Q/m³/ h
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