Wilo Helix VE 52 Einbau- Und Betriebsanleitung Seite 46

English
7.3 Pipe connection
- Connect the pump to the pipes by using approp-
riate counterflanges, bolts, nuts and gaskets.
CAUTION!
Tightening of bolts must 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.
- It is recommended that isolation valves be ins-
talled 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.
- 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 phases + 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.
46
- 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.
Power (kW)
0.55 0.75 1.1 1.5
M25
Power (kW)
5.5
M25
Power (kW)
11 15
M32/M40
2.2 3 4
7.5
18.5 22
WILO SE 03/2019