Wilo Sub TWI 4 Serie Notice De Montage Et De Mise En Service page 35

now be lowered further until the upper pipe flange
rests on the attached support clamp.
7 Remove the mounting bracket from the flange and
attach it to the next pipe. Lift up the rising pipe, move
it over the well and flange-bolt the free end to the ris-
ing pipe. Place another seal between the connections.
Beware of serious crush injuries!
After the support clamp is removed, the hoisting
gear bears the entire weight of the system and
the pipe sags. This can lead to serious crush inju-
ries! Before removing the support clamp, ensure
that the holding cable in the hoisting gear is
taut!
8 Remove the support clamp, then fasten the cable
slightly above and below the flange with a cable clip.
For heavy, large-diameter cables, it is advisable to
attach a cable clip every 2 to 3 meters. If several cables
are used, each must be fastened separately.
9 Lower the rising pipe so that the flange is in the well,
put the support clamp back on and lower the rising
pipe until the next flange touches the support clamp.
Repeat steps 7 to 9 until the rising pipe reaches the
required depth.
10 On the last flange, remove the mounting bracket and
attach the well cover.
11 Attach the lifting gear to the well cover and raise it
slightly. Remove the support clamp, feed the cable out
through the well cover and lower the cover on to the
well.
12 Bolt the well cover fast.
Installation with threaded connections
The procedure is almost the same as for installation
with flanged pipes. However, please note the following:
1 The pipes are joined by means of threaded connec-
tions. The threaded pipes must be screwed tight to
each other without leaks. This means the pipe ends
must be wound with oakum or Teflon tape.
2 When screwing the pipes together, make sure that
they are in line, so that the thread is not damaged.
3 Note the direction of rotation on the unit. Use a pipe
with the correct thread (right or left-handed) so that
the pipe cannot become unscrewed by accident.
4 The threaded pipe must be secured against accidental
loosening.
5 The support clamp required during installation must
always be firmly mounted directly below the pipe con-
nection bell. Tighten the screws evenly until the clamp
is firmly touching the pipeline (the arms of the sup-
port clamp may not touch each other).
5.4.4 Horizontal installation
Fig. 3: Installation
1 Unit
2 Discharge pipe
3 Pressure vessel
4 Cooling jacket
5 Minimum water level
6 Level sensors
Installation and operating instructions Wilo-Sub TWI 4..., TWI 4...-QC
7 Operating area
8 Water tank
9 Intake
10 Intake filter
11 Dry-run protection
This installation type is only permitted when used
together with a cooling jacket. The unit is installed
directly in the water tank/reservoir/container and
flanged onto the discharge pipe. The cooling jacket
supports must be mounted at the distances specified
to prevent the unit from distorting.
The connected pipeline must be self-supporting,
i.e. it may not be supported by the product.
When installed horizontally, the pipe and unit are
mounted separately. Make sure that the discharge port
of the unit and the pipeline are level.
On this type of installation, the product must be
installed with a cooling jacket.
1 Drill the fastening holes for the supports on the floor of
the operating area (container/reservoir). You will find
specifications for the anchor bolts, distances between
holes and their sizes in the corresponding instructions.
Make certain that the screws and plugs are sufficiently
stable.
2 Fasten the supports to the floor and bring the product
into the correct position using a suitable hoisting gear.
3 Fasten the product to the supports using the supplied
fastening materials. Ensure that the type plate points
upwards!
4 Once the unit is firmly mounted, you can install the
piping system or flange-connect a piping system
which is already in place. Ensure that the discharge
ports are level.
5 Connect the discharge pipe to the discharge port. A
seal must be placed between the flanges of the pipe-
line and the unit. Tighten the fastening bolts in a cross
pattern to avoid damaging the seal. Please note that
the pipe system is mounted so that there is no vibra-
tion or tension (use elastic connection pieces, when
necessary).
6 Lay the cables in such a manner that no-one (mainte-
nance personnel etc.) will be endangered by them at
any time (operation, quick repairs). Do not damage the
power supply lines. The electrical connection must be
carried out by an authorized technician.
5.5 Dry-run protection
Make sure that no air enters the hydraulic housing. The
product must therefore always be submerged in the
pumped liquid up to the top edge of the pump hous-
ing. For optimum reliability, we recommend installing a
dry-run protection system.
Correct running is ensured by float switches or elec-
trodes. The float switch or electrode is fixed in the
shaft and switches off the machine when the water
level falls below the minimum coverage level. If the dry-
run protection is put into effect with only one float or
electrode whilst the filling levels fluctuate strongly,
there is a danger that the unit will turn on and off con-
stantly!
This can result in the maximum number of motor
start-ups (switching cycles) being exceeded and
the motor overheating.
English
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