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4.6
Hydraulic specifications
The hydraulic specifications represents the
pressure (available head for the central
heating system) as a function of the flow
rate.
Models Advance Plus 16S ERP
Advance Plus 25S ERP
Pression (bar)
0,50
0,45
0,40
0,35
0,30
0,25
0,20
0,15
0,10
0,05
0,00
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500
Fig. 4.2
Model
Advance Plus 30S ERP
Pression (bar)
0,50
0,45
0,40
0,35
0,30
0,25
0,20
0,15
0,10
0,05
0,00
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500
Fig. 4.3
The boiler load loss has already been re-
moved.
Flow rate with closed thermostatic
valves
The boiler is equipped with an automatic
by-pass, which protects the condensing pri-
mary exchanger.
In case of excessive reduction or total stop-
ping of water circulation in the heating plant
due to the closing of thermostatic valves or
circuit elements valves, by-pass ensures a
TECHNICAL INFORMATION
Flow (l/h)
Flow (l/h)
minimum water circulation inside the con-
densing primary exchanger.
The by-pass is calibrated to a differential
pressure of about 0.3-0.4 bar.
4.7
Expansion vessel
Note: this boiler is designed for opera-
tion only in a sealed central heating sys-
tem.
The height difference between the pressure
relief valve and the highest point in the sys-
tem may be 10 m at most.
For greater differences, increase the pre-
load pressure in the expansion vessel and
the system, when cold, by 0.1 bar for each
additional 1 m.
Total capacity
Pre-load pressure
Useful capacity
Maximum volume of water in
the system *
Fig. 4.4
* Where conditions are:
• Average maximum temperature of the
system is 85 °C
• Initial temperature when filling up the sys-
tem is 10 °C.
For
systems
greater then the one indicated in
the above table, an additional
expansion vessel must be pro-
vided.
l
7,0
kPa
100
bar
1,0
l
3,5
l
109
with
volumes
- 31 -
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