Lowara FHE Serie Instrucciones De Instalacion Y Uso página 21

Connect the pump to the mains using a multiple-pole switch or other device ensuring multiple-pole discon-
nection (interruption of all the supply wires) from the mains, with a contact separation of at least 3 mm.
Remove the terminal board cover by first removing the screws.
Carry out the connections as indicated on the back of the terminal board cover, and as shown in
fig. 3 - 4.
The single-phase version has a built-in overload protection (2.2 kW excluded) ; the three-phase version
must be equipped by the user with a magneto-thermal switch or magnetic starter with overload and un-
dervoltage protection, a thermal relay and fuses installed upstream.
The overload relay must be set to the motor current rating. The thermal relay may be set to a current
value slightly lower than the full load value when the electric pump is definitely underloaded, but the
thermal overload protection must not be set to current values higher than the full load values.
Checking the rotation direction of electric pumps with three-phase motors.
The direction of rotation may be checked before the pump is filled with the liquid to be pumped, provided
it is run for very short starts only.
The pump must not be run until it is filled with liquid.
WARNING
Continuous dry running will damage the mechanical seal beyond repair.
If the direction of rotation is not anti-clockwise when facing the pump from the suction side interchange
two supply leads.
6.2 Priming
To prime the pump, fill it and the suction pipe with the liquid to be pumped. To fill the pump, remove the
fill plug and proceed as follows:
– Pump with positive suction head:
open the suction gate valve and let the liquid in until it comes out of the fill plug.
– Pump with negative suction head, fitted with foot valve:
fill the pump and the suction pipe through the fill plug. To speed up the operation the pump may be fil-
led through the delivery port. Make sure to allow all air to escape. The pump is full only when there is a
stable liquid level at the fill plug and all air bubbles have escaped. For twin-impeller pumps, keep the
air valve on the pump body open throughout the filling operation, until the water overflows.
When the pump is full start it with the delivery gate valve closed, then open it gradually. Make sure that
the pressure and flow rate are constant; if not, stop the pump and repeat the entire operation.
For pumps with two seals mounted on both ends of motor (SHOD).
WARNING
The seals are flushed by the circulation of the external liquid (compatible with the
pumped liquid).
The pressure of this liquid must be at least 0.5 bar higher than the pressure inside
the pump body.
6.3 Running
If all the installation and filling operations have been carried out correctly, the pump will run smoothly and quietly.
The maximum noise of the electric pump when properly installed and operating within its limits is as per
the table below:
MOTOR POWER
2 POLES 50 Hz
≤ 7,5 kW
9,2 - 11 kW
15 - 22 kW
30 - 37 kW
45 - 55 kW
*
Average sound pressure level at 1-meter distance from the pump in an open field.
Always drain the pump whenever it remains inactive at freezing temperatures.
MOTOR POWER
4 POLES 50 Hz
Up to 30 kW
SOUND PRESSURE
LEVEL * Lp(A) dB ± 2
< 70
73
75
80
84
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