Hydraulic Connections; Electrical Connections - Wilo Economy MHIE Série Notice De Montage Et De Mise En Service

NOTE: Keep in mind that the altitude of the ins-
tallation place and the water temperature may
reduce the suction possibilities of the pump.
Altitude Loss of head
0 m 0 mCL
500 m 500 mCL
1000 m 1000 mCL
NOTE: Beyond 80° C, plan to install the pump in
load.
7.2

Hydraulic connections

CAUTION! Danger of material damage!
The installation has to bear the pressure reached
when the pump runs at maximum frequency and
zero flow rate.
- Connection by flexible hose with reinforcement
or rigid propeller.
CAUTION! Danger of material damage!
Connections has to correctly sealed: No air entrance
is allowed on the suction pipe which is showing a
mounting declivity 2 % (Fig. 1).
- With rigid pipe, avoid the pump to bear the
weight of the pipes, use supports (Fig. 1).
- The diameter of the pipe must never be smaller
than the suction/delivery ports.
- Limit the length of the suction pipe and avoid all
features that cause losses of head (bends, valves,
tapers).
CAUTION! Danger of material damage!
When the pump is under pressure, it is recom-
mended to connect the non-return valve to the
pump discharge to protect it against hammer blow
effects.
Installation and operating instructions – Wilo-Economy MHIE
Temperature Loss of head
20 °C 0.20 mCL
30 °C 0.40 mCL
40 °C 0.70 mCL
50 °C 1.20 mCL
60 °C 1.90 mCL
70 °C 3.10 mCL
80 °C 4.70 mCL
90 °C 7.10 mCL
100 °C 10.30 mCL
110 °C 14.70 mCL
120 °C 20.50 mCL
7.3

Electrical connections

WARNING! Electrical connections shall only be
made by approved specialised electricians and in
compliance with the applicable regulations.
The electric characteristics (frequency, voltage,
nominal current) of the motor-converter are men-
tioned on the pump identification sticker (item 19).
Check that the motor-converter complies with the
mains supply used.
• The electric protection of the motor is integrated
into the converter. The parameters take into
account the characteristics of the pump and must
ensure its protection and the one of the motor.
• In case of impedance between earth and neutral
point, install a protection before motor-converter.
• Provide a fuse-disconnecting switch (type gF) to
protect the mains installation (Fig. 1, 2, item 11).
NOTE: If you have to install a differential cir-
cuit-breaker for users protection, it must have
a delay effect. Adjust it according to the current
mentioned on the variator label.
Use power cables conforming with standards.
DANGER! Danger of death!
Do not forget to connect to earth.
The electric connection of the variator (Fig. 3),
saccording to its operating modes (see chapter 6
for starting) has to comply with the schemes of
the following table.
CAUTION! A connection error would damage the
variator.
CAUTION! The power cable must never touch the
pipe or the pump; make sure that it is sheltered
from any humidity.
• You can change the orientation of the motor-va-
riator by quarter turn when removing the fixing
screws of the motor and reorientating the motor
to the wished position.
• Place the screws back.
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
contacts are not live.
• S'assurer de la bonne affectation des bornes de
raccordement.
- The power supply cable (3 phases + earth)
mustbe inserted into the gland indicated below
in black.
The glands that aren't used must remain sealed
using plugs provided by the manufacturer.
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