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7.3
Pipe connection
- Connect the pump to the pipes by using appro-
priate counter flanges, screws, nuts and gaskets.
CAUTION!
Tightening of screws or bolts must not exceed:
PN 16/PN 25 configuration
M10 – 20 N.m
PN 40 configuration
M12 – 50 N.m
The use of an impact wrench is prohibited.
- The flow direction of the fluid is indicated on the
identification sticker of the pump.
- The suction and discharge pipe sockets must be
installed so that they do not induce any stress
into the pump. The pipes must be attached so
that the pump does not bear their weight.
- We recommend installing gate valves on the suc-
tion and pressure sides of the pump.
- Use expansion joints to mitigate noise and vibra-
tion from the pump if required.
- The pipe cross-section must be at least equal to
the diameter of the suction port on the pump
housing.
- The installation of a non-return valve in the
discharge pipe is recommended to protect the
pump against pressure surges.
- If connected directly to the public potable water
mains, the suction pipe socket must also be fit-
ted with a non-return valve and a stop valve.
- The cables for the sensor, the external instruction, the
inputs [Ext. Off] and [Aux] must be shielded, and inserted in
the gland M12 or M16.
The metal glands of the converter are adapted
to installation with protective braiding.
46
M12 – 30 N.m
M16 – 80 N.m
Power (kW)
M12
M16
M16
M20
M25
7.4
Electrical connections
DANGER! Risk of fatal injury!
Hazardous voltage due to the discharge of the
converter capacitors.
• Before any work on the converter, wait for
5 minutes after disconnecting the power supply.
• Check that all electrical connections and con-
tacts are not live.
• Check that the pressure connection terminals
have been allocated correctly.
- The power supply cable (3 phases + earth) must
be inserted into the gland indicated below in
black.
- The glands that aren't used must remain sealed
using plugs provided by the manufacturer.
M25
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WILO SE 04/2020
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