INST
ALLA
TION
MANUAL
12
0
0,2
0,4
0,6
0,8
1
1,2
1,4
200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800
Novella 24, 31
Portata (l/h)
Perdite di carico (m.c.a.)
Novella 45
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
200
400
600
800
1000 1200 1400
1600 1800 2000 2200 2400
Speed I
Speed II
Speed III
Flow rate (l/h)
Useful head (m approx.)
Boiler’s water-side pressure drop
Novella RAI
boilers come without a pump. A
pump must therefore be provided as part of
the installation. In order to choose a pump of
Useful head of pump
Novella RAI PV
series boilers are pre-fitted
with a pump to which all water and electrical
connections have already been made. Pump
performance is illustrated by the curves in the
following graph.
the right size, bear in mind the boiler’s water-
side pressure drop, as shown in the following
graph.
The pump is configured in the factory to run at
maximum speed, i.e. speed III. Slower pump
speeds may nevertheless be set with low load
loss systems in order to reduce energy con-
sumption.
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. 2.12
Fig. 2.13
Fig. 2.14
Pressure drop
(m approx.)
Flow rate (l/h)
