English (GB)
8
3.3 Pipework
The pipes should be fitted so that any tension
caused by variations in temperature does not affect
the pump.
3.3.1 Suction pipe
If the pump is to draw liquid from a level lower than
the pump suction port, a foot/non-return valve must
be fitted to the end of the suction pipe, below the
lowest liquid level, since the pump is not
self-priming.
The suction pipe is connected to the pump suction
port S. See fig. 3.
Fig. 3
Suction and discharge ports
When the suction pipe is longer than 10 metres or
the suction lift is greater than 4 metres, the diameter
of the suction pipe must be larger than that of the
pump suction port.
Every joint of the suction pipe must be completely
tight.
If a hose is used as suction pipe, it must be
non-collapsible. A strainer is recommended in cases
where solids could enter the suction pipe and block
the pump.
3.3.2 Discharge pipe
The discharge pipe is connected to the discharge
port T. See fig. 3.
The discharge pipe should be at least the same
diameter as the discharge port of the pump, to
minimise pressure drop, high flow velocities and
noise.
3.3.3 Bypass
If there is any danger of the pump running against a
closed discharge valve, a minimum liquid flow
through the pump should be ensured by connecting
a bypass/a drain to the discharge pipe. The drain
can for instance be connected to a tank.
A minimum flow rate equal to 10 % of the flow rate at
maximum efficiency is needed at all times. Flow rate
and head at maximum efficiency are stated on the
pump nameplate.
3.4 Installation examples
The pump is suitable for a wide range of
applications.
Some examples are shown on page 51.
4. Electrical connection
The electrical connections should be carried out in
accordance with local regulations.
The operating voltage and frequency are marked on
the nameplate. Please make sure that the motor is
suitable for the power supply on which it will be used.
Single-phase motors
, 1 x 110/220 V, 60 Hz, do not
incorporate motor protection and must be connected
to an approved motor-protective circuit breaker.
Other single-phase motors incorporate a thermal
overload switch and require no additional motor
protection.
Three-phase motors
must be connected to a
motor-protective circuit breaker, the set rated current
of which must correspond to the electrical data on
the pump nameplate.
Do not start the pump until it has been filled with
liquid.
Connections should be made as shown on the inside
of the terminal box cover.
Choose one of the two cable entries and knock out
the pre-cut disk.
4.1 Checking the direction of rotation
(Three-phase motors)
Arrows on the motor fan cover indicate the correct
direction of rotation.
The pump should rotate counter-clockwise when
viewed from the motor end.
To reverse the direction of rotation, switch off the
power supply and interchange any two of the
incoming supply wires.
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Warning
Never make any connections in the
pump terminal box unless the power
supply has been switched off.
The pump must be connected to an
external mains switch.
