FLYGT CHF Serie Instrucciones De Instalacion Y Uso página 19

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.
TThe direction of rotation may be checked before the pump is filled with the liquid to be pumped, provi-
ded it is run for very short starts only.
WARNING
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
2 POLES 50 Hz
≤ 3 kW
4 kW
–
5,5 - 7,5 kW
9,2 - 22 kW
30 - 37 kW
45 - 55 kW
*
Average sound pressure level at 1-metre distance from the pump in an open field.
6.4 Adjusting the performance according to the operating requirements
The capacity and head can be set to the required value by turning the impeller, provided that no weld
points are removed. See fig. 12 for welded impellers and fig. 13 for cast steel impellers.
WARNING
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.
MOTOR POWER
4 POLES 50 Hz
CHF up to 9,2 kW
EQF up to 4 kW
EQF 5,5 - 7,5 kW
Remove all turning burrs carefully.
SOUND PRESSURE
LEVEL * Lp(A) dB ± 2
< 70
71
72
76
81
83
86
en
SOUND POWER
LEVEL Lw(A) dB ± 2
81
82
86
91
94
97
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