Start-Up; Electrical Connections - FLYGT CHF Serie Instrucciones De Instalacion Y Uso

en
5.5.2 Pipe clamping
(*) Suction lift is determined based on liquid temperature, elevation, flow resistance and NPSH required by the pump.
A few pump models, at the highest capacity allowed, have a high NPSH requirement and therefore, under particular operating
conditions, the maximum suction lift may be limited or even such as to require installation below the head. In such cases carefully check
the suction conditions to avoid operating problems (cavitation).

6. Start-up

The pump must run smoothly and quietly. Avoid long running with the delivery gate valve closed. Always
drain the pump whenever it remains inactive at freezing temperatures.

6.1 Electrical connections

WARNING
DANGER
RISK OF
ELECTRIC SHOCK
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.
18
FIG. 1
Correct installation
A = Eccentric reductions
B = Positive gradient
C = Good immersion
D = Large bends
E = Suction pipe diameter ≥ pump port diameter
F = Suction lift depends on the pump and
installation (*). In normal conditions this
should not exceed 5-6 m
G = Suction lift depends on the pump and
installation
Make sure that the rated voltage corresponds to the supply voltage.
Ground the pump before making any other connection.
We recommend that a high sensitivity differential switch (30 mA) be
installed as extra protection against lethal electric shocks in the event of
faulty grounding.
FIG. 2
Incorrect installation
1 = Sharp bend: high flow resistance
2 = Insufficient immersion: sucking air
3 = Positive gradient: air pockets
4 = Pipe diameter < pump port
diameter: high flow resistance