Electrical Connection - Wilo Sub TWI 4 Notice De Montage Et De Mise En Service

• A 6" borehole is recommended for 4" pumps with
>9 m³/h rated volume flow rate, an 8" borehole is
recommended for 6" pumps with >30 m³/h rated
volume flow rate.
• The water inlet in a borehole or well must be ade-
quate for the pump's flow capacity.
• The pump is lowered into place using a block and
tackle and tripod, heavy pumps are lowered into
place using a cable winch. Installation should take
place away from the incoming water or the filter
pipe.
• Never allow the pump to run dry. It must be
ensured that, even during dry periods, the water
level never falls below the top of the unit.
• A consistent inner pipe diameter of 4" (102 mm)
or 6" (152 mm) should be ensured in order to
guarantee that the pump can be lowered easily.
• The pump must never be lowered or pulled up
using the electrical cable.
• Electrical connection work and extension of the
motor cable must be performed before lowering
the pump.
• The pump must be installed at least 0.30 m above
the bottom of the well or the borehole (Fig. 4).
• The system name plate must be fitted near the
borehole to ensure access to the technical data of
the installation.
• The insulation resistance on the motor and cable
must be checked prior to lowering (and during
lowering in deep boreholes) (min. 2 M
• Depending on pump design, the pump can be
connected via a solid or flexible pipe, 1¼" to 3"
nominal diameter.
• The pump must be secured using a safety rope
when using flexible pipes. Use the steel eye bolts
Diameter and max. lengths of the cable for direct start:
Motor version Motor
kW
EM 0.25
1~ 50/60 Hz 230 V 0.37
0.55
0.75
1.10
1.50
2.20
DM 0.37
3~ 50 Hz 400 V
0.55
3~ 60 Hz 480 V
0.75
1.10
1.50
2.20
3.00
3.70
4.00
5.50
7.50
Cable weight (kg/m)
Installation and operating instructions Wilo-Sub TWI4-6
Ω
).
Cable
4 x 1.5 mm² 4 x 2.5 mm²
100 --
85 144
64 107
49 83
32 54
25 35
17 25
661 1102
454 758
341 569
245 409
179 299
121 202
94 157
76 128
70 118
52 87
39 65
0.20 0.25
on the pump head for this. Solid pipes are pre-
ferred.
• It is recommended that you fit an additional non-
return valve and shut-off valve on the borehole
output.
CAUTION! Danger of material damage!
When the water pressure is raised (>180 m Ws)
a non-return valve must be installed directly at
the pump outlet. The non-return valve must be
designed for a permissible operating pressure of
at least 20 bar!
• Observe the required motor cooling (see table
under "Fluid temperature")!

7.2 Electrical connection

DANGER! Risk of fatal injury!
A fatal shock may occur if the electrical connec-
tion is not made correctly.
Only allow the electrical connection to be made
by an electrician approved by the local electric-
ity supplier and in accordance with the local reg-
ulations in force.
• The current type and voltage of the mains con-
nection must correspond to the specifications on
the name plate.
• Use the connecting cable in accordance with
applicable standards/regulations and connect it
according to the switchgear or switch cabinet ter-
minal diagram.
CAUTION! Danger of material damage!
The max. length of the cable is dependent on the
nominal current consumption of the motor and
the cable cross-section!
Refer to the table and check the lengths and
diameters of the cable before connection!
4 x 4 mm² 4 x 6 mm²
-- --
-- --
140 --
110 165
80 120
60 95
45 65
1764 2646
1213 1819
911 1367
655 983
478 718
324 486
252 378
204 307
188 283
140 210
104 157
0.30 0.40
4 x 10 mm² 4 x 16 mm²
-- --
-- --
-- --
-- --
195 --
153 245
102 163
4411 7057
3032 4852
2279 3647
1639 2623
1196 1915
811 1298
630 1008
512 819
472 755
351 562
261 418
0.65 0.85
English
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