Wilo Sub TWI 5, Installation And Operating Instructions Manual, Page: 18 / 104

18 WILO SE 04/2013
English
NOTE: the single-phase pumps have an overcur-
rent protection, integrated into the box.
- The pump with single-phase motor is cabled and
delivered with a capacitor box and a thermic pro-
tection. This box has to be connected to the
supply network with the cable provided to that
effect.
- Connection of a float switch or a pressure
switch.
DANGER! Disconnect the pump from the net-
work before opening the box.
Remove the strap and connect in its place the
feed cable of the on/off switch and the earth
cable if provided. Please refer to the terminal
diagram inside the terminal box for details of the
electrical connection.
- Levels regulation : to ensure that in off position,
the water level is always 150 mm minimum over
the suction sieve (see Fig. 3a).
7. Starting up
7.1 Direction of rotation
NOTE: The pressure measured at the borehole
outlet with closed valve corresponds to the head
of the pump at zero output minus the height
between ground level and water level.
Single-phase 230 V : No reverse risk
Three-phase 400 V : To determine the right
direction of rotation of the unit, to compare the
delivery pressure, and bear in mind that the right
direction of rotation corresponds to the highest
pressure.
Or by measuring the pressure, delivery valve
closed and compare it to the required one.
In case of reverse direction of rotation, inter-
change the two phase wires inside the box or
circuit breaker.
7.2 Operation
CAUTION! Possible damage of the pump
Never allow the pump to run dry or operate with
the shut-off valve closed. The manufacturer’s
guarantee does not cover damage to the pump
caused by dry running.
- During the filling of the sump or installation of
the pump in this one, take care that the float
switch can move freely.
- Once again check all the electric connections,
electric protection, rating of the fuse(s).
- Measure the current in each phase and compare
with the nominal values mentioned on the
nameplate.
CAUTION! Possible damage of the pump
Do not exceed the nominal current of the motor.
- After being submerged, the pump should be
switched on and off several times to allow it to
be ventilated.
- It is necessary to realize a hole Ø3 mm in the
piping (see Fig. 3, pos. 13) for to improve the air
evacuation.
- Measure the power supply voltage with motor
running.
NOTE: See 5.2 for allowed tolerance
8. Maintenance
DANGER! Isolate from power supply before
checking the pump!
- The pump does not require particular mainte-
nance.
- If the sieve is obstructed, the flow rate decreases
significantly, you must carry the pump back, dis-
mantle the cover.
- The repairs on the pump and the modifications
of the electric connection will be realized by a
specialist or a after sales member only.
- It is advisable to mention the nameplate specifi-
cations at the time of a spare parts order.