Xylem FHF SHF - Manual (Page 21)

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The three-phase version must be equipped by the user with a magneto-thermal switch or magnetic
starter with overload and undervoltage 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.
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.
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 MOTOR POWER SOUND PRESSURE SOUND POWER
2 POLES 50 Hz 4 POLES 50 Hz LEVEL * Lp(A) dB ± 2 LEVEL Lw(A) dB ± 2
≤ 3 kW FHF up to 9,2 kW < 70
SHF up to 4 kW
4 kW 71 81
– SHF 5,5 - 7,5 kW 72 82
5,5 - 7,5 kW 76 86
9,2 - 22 kW 81 91
30 - 37 kW 83 94
45 - 55 kW 86 97
* Average sound pressure level at 1-metre distance from the pump in an open field.
Always drain the pump whenever it remains inactive at freezing temperatures.
During operation, the outer surface of the pump (if hot liquids are being pumped) and
the outer surface of the motor can exceed 40°C. Do not touch with parts of your body
(e.g.: hands) and do not put combustible material into contact with the pump.
WARNING
001073145_L_F_02-11:001073145_L_E_12-10 21-02-2011 16:44 Pagina 21