Xylem GEN series firefighting booster sets - Manuale (Pagina 28)

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For sets with diesel pump, refer also to the handbook provided with the
diesel pump!
Installation of accessories
Refer to the instructions supplied with the accessories
Flow meter
The flow meter allows you to check the flow rate of each pump and is supplied unassembled
as an optional accessory. Check the sales documentation for selection of a suitable model.
Suction kit
The kit contains valves and adapters suitable for installation with positive suction head or
suction lift. It is supplied unassembled as an optional accessory. Check the sales
documentation for selection of a suitable model.
Priming kit
The kit contains the tank and accessories suitable for suction lift installation. It is supplied
unassembled as an optional accessory. Check the sales documentation for selection of a
suitable model. The piping is not included.
5. Settings
Disconnect the power supply before making any adjustments.
Operation
The automatic starting of the pumps is determined based on the pressure switch settings.
There are two pressure switches for each pump, both having the same settings and being
connected in such a way as to start the pump when either one of them is triggered.
The pressure differential (difference between the starting and stopping pressures) is the same
for both pumps, the typical value being 0.6-1.0 bar.
As provided by the firefighting standards, the first pump starts up automatically when the
pressure in the main piping drops to a value no lower than 0.8∙Pmax (Pmax pressure with
delivery shut off). The second pump starts when the pressure drops to a value no lower than
0.6∙Pmax.
Figure 3 shows the operating method for sets with two pumps:
WARNING