Wilo Helix VE 11kW-IE5, Installation And Operating Instructions Manual

Page: 18 / 48

English
18
WILO SE 10/2022
7.3 Pipe connection
- After removing the plugs from the pump housing
and cleaning the seal faces between the pump
and the system, connect the pump to the pipe-
work using appropriate counterflanges, screws,
nuts, washers and seals.
CAUTION!
Tighten the nuts crosswise in steps of 20 Nm
and do not exceed 80 Nm
Use of impact wrench is prohibited.
- The circulation sense of the fluid is indicated on
the identification label of the pump.
- Pump must be installed in such a way that it is
not stressed by the pipework. The pipes must be
attached so that the pump does not bear their
weight.
- I t is recommended that isolation valves be
installed on the suction and discharge side of the
pump.
- Use of expansion joints may mitigate noise and
vibration of the pump.
- As regards the nominal cross-section of the suc-
tion pipe, we recommend a cross-section at least
as large as that of the pump connection.
- A check valve could be placed on the discharge
pipe in order to protect the pump against ham-
mer shock.
- For direct connection to a public drinking water
system, the suction pipe must also have a check
valve and a guard valve.
- For indirect connection via a tank, the suction
pipe must have a strainer to keep any impurities
out of the pump and a check valve .
- In case of half flanges pump design, it is recom -
mended to connect the hydraulic network and
then keep out the plastic fixation links to pre -
vent any leakage risk.
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.
DANGER! Risk of fatal injury!
For generator operation or turbine operation of
the pump (rotor drive), there may be a danger-
ous contact voltage at the module’s contacts.
• Close the shut-off devices upstream and
downstream of the pump.
- The supply cable must be routed in such a way
that it does not contact the pipework and/or
pump and motor casing.
- The power cable (3 earth) must be fed
through the threaded cable connection shown in
black below.
Non-assigned threaded cable connections must
remain sealed with the plugs provided by the
manufacturer.
- The power supply cable (3 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.
Power (kW)
11 15 18.5 22
M32/M40