Wilo Sub TWI 5, Installation And Operating Instructions Manual

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17 WILO SE 04/2013
English
• Connection for a float switch (Low-water - / Dry
running protection),
• Cable connected to the terminal box as well as to
the pump,
• Connected 2 m long cable with shock-proof plug.
The motor is fitted with a winding protection
which automatically switches the motor off if it
overheats and on again once it has cooled down.
Three-phase pumps (DM) are supplied with bare
cable lead ends.
The switch box can be ordered from the Wilo
range or provided by the customer.
It must be fitted with a motor safety switch.
Once the over current protective device has been
triggered the fault must be reset by operating
the cut-out switch.
6. Installation - Mounting
DANGER! Installation and electrical work in com-
pliance with any local codes and by qualified
personnel only !
WARNING! Bodily injury
Existing regulations for the prevention of acci-
dents must be observed.
WARNING! Electrical shock hazard
Dangers caused by electrical energy must be
excluded.
National Electrical Codes, local codes and regula-
tions must be followed.
6.1 Installation
CAUTION! Possible damage of the pump
Do not transport, hang or suspend the pump by
the cable.
- The pump must be installed in frost-free place.
- Fix the rope in the hole of fixing in the superior
part of the pump.
- Connect the delivery pipe work.
- Fix the supply cable without constraint to the
delivery pipe with the appropriate bindings.
- Lower the pump with the help of the rope and
support it so that it is always immersed in water,
maximum depth: 20 m and in suspension.
- The pump can run in a horizontal position.
- To ensure that the well diameter is always con-
stant and allows a free lowering of the unit.
- To centre the pump in the middle of the well.
- To ensure that the pump, the electric cable and
the rope, in operation, could not rub against the
well sides or any other obstacle.
- In final position, the unit must be hung 0.50m at
least over the well bottom.
- To ensure that the minimum water height is
always 0.15 m over the suction sieve of the
pump (pump in operation).
- For outdoor installation, protect the delivery pipe
work, the electric box, valves, flap, electric con-
trols from frost.
- If a floating tapping device (suction filter with
hose connection) is used take care to ensure that
the length of the hose is adapted to the struc-
tural conditions of the cistern. To prevent air
from entering, the filter basket must no reach
the surface of the water (see Fig. 8).
- The SE type model can be installed directly on
the ground using the 4 holes located on the sup-
port (Ø6 mm bolts).
- The SE-type model can be installed out of water,
because the motor is cooled by the fluid (see
Fig. 7).
- The versions FS are delivered with a float switch
directly connected to the motor, which allow the
automatic ON / OFF of the pump (see Fig. 3b).
The float switch can move freely.
- The box delivered with the single-phase pumps
allows the dry run safety through a float switch
adaptation (see § 7.3) or an on-off control
through a pressure switch connection
(see Fig. 4).
- Control box suggested for three phase version
allows the dry running protection by use of a
float switch, also the automatic running by pres-
sure switch (see Fig. 5).
6.2 Hydraulic connections
CAUTION! Possible damage of the pump
During the use of SE pump, fill the section hose
with water before starting the pump (see Fig. 8).
The TWI5 pumps are not self-priming.
- The pipework diameter cannot be inferior to the
pump's one on rigid threaded steel pipework or a
semi rigid polyethylene high density pipework.
- In the case of a semi rigid pipework the pump
must be supported by a cable fixed to the lifting
ring situated on the discharge casing.
- The installation of a non return valve in pump out-
let and before the isolation valve is obligatory.
6.3 Electrical connections
WARNING! Electrical shock hazard
The electrical connections and the inspections
have to be done by a qualified electrician and
comply with the applicable local standards.
The power supply of the pump must include a cir-
cuit having a residual current difference device
(earth fault breaker) acting at no more than 30 mA.
In case of cord damaged, make it replace by a
qualified electrician.
- Control the kind of current and the network
voltage.
- Observe the specifications of the pump name-
plate.
- Do not forget to connect the earth.
- The three-phase pump is delivered with a 20 m
long cable to be connected with a protection
mechanism or a connection box (electrical con-
nection: see installation and operating instruc-
tions of the switching device).
- The motors must be protected by a circuit-
breaker set to the current mentioned on the
nameplate of the motor. Provide a fuse discon-
necting switch (type aM) to protect the mains
supply.