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INST
ALL
ATION
TECHNICAL SPECIFICATIONS
4.4 Hydraulic characteristics
The hydraulic characteristics represent the
pressure (head) available in the heating sys-
tem based on the flow rate.
Model
M300V.1616 SV - M300V.2025 SV
Figure 4.4
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
Pressure (bar)
Flow rate (l/h)
Model
M300V.3035 SM
Figure 4.5
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1450 1500
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
Pressure (bar)
Flow rate (l/h)
The load loss for the boiler has already been
subtracted.
Flow rate with the thermostatic cocks
closed
The boiler has an automatic by-pass, which
protects the primary condensate exchanger.
If the circulation of water in the heating system
decreases too much or totally stops due to the
closure of thermostatic valves or circuit cocks,
the by-pass guarantees a minimum circulation
of water inside the primary condensate ex-
changer.
The by-pass is calibrated for a differential pres-
sure of approx. 0.3-0.4 bar.
4.5 Expansion vessel
The difference in height between the safety
valve and the highest point in the system can
be max. 10 metres.
If differences are greater, increase the pre-load
pressure of the expansion tank and the cold
system by 0.1 bar for each 1 metre increase.
Figure 4.6
Total capacity
l
7.0
Pre-load pressure
kPa
100
bar
1.0
Useful capacity
l
3.5
Maximum system content *
l
109
* In conditions of:
• Max. average system temperature of 85°C
• Initial temperature when filling the system
10°C.
For systems with contents that ex-
ceed the maximum system content
(indicated in the table), a supple-
mentary expansion tank must be
installed.
