Beretta NOVELLA 55 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.
0,04
0,035
0,03
0,025
0,02
0,015
0,01
0,005
0
200 300 400 500 600 700 800
Flow rate (l/h)
Fig. 2.12
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 55 RAI
900 1000 1100 1200
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.
Novella 64 RAI
Novella 71 RAI
1300 1400 1500
Fig. 2.11
11