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Control modes
Variable differential pressure (Δp-v):
If the volume flow in the pipe network decreases, the pump
reduces the delivery head by half (Fig. 2a).
Constant differential pressure (Δp-c):
The control keeps the set delivery head constant irrespec-
tive of the volume flow delivered (Fig. 2b).
3 speed stages (c1, c2, c3):
c1, c2, c3
The pump runs uncontrolled in three prescribed fixed speed
stages (Fig. 2c).
4 Installation and electrical connection
4.1
Installation
DANGER: Before starting work, make sure that the
pump is disconnected from the power supply.
Installation site
• Provide a weatherproof, frost-free, dust-free, and
well-ventilated room for the installation.
Choose an easily accessible installation site.
• Prepare the installation site so that the pump can be
installed without being subjected to mechanical stresses.
If necessary, support or secure piping on both sides of
the pump.
NOTICE: Provide shut-off devices upstream and down-
stream of the pump to facilitate potential future pump
replacement. Perform the installation in a way that prevents
leaking water from dripping onto the control module. To do
this, align the upper gate valve laterally if necessary.
• Complete all welding and soldering work near the pump
prior to the installation of the pump.
Installation and operating instructions
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