Beretta NOVELLA 31 RAI Installation Manual page 11

Boiler's water-side pressure drop
Novella RAI boilers come without a pump. A
pump must therefore be provided as part of
the installation.
1,4
1,2
1
0,8
0,6
0,4
0,2
0
200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800
Flow rate (l/h)
Fig. 2.10
In order to choose a pump of the right size,
bear in mind the boiler's water-side pressure
drop, as shown in the following graph.
Novella 31
Novella 45
b
On initial start-up and at least every year,
check that all the pumps in the system
rotate freely. Sludge and limescale can
build up and cause seizure, especially
after long periods of disuse.
a
Never run the pump dry.
Fig. 2.9
11