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4.7 Hydraulic characteristics
The hydraulic characteristics represent the
pressure (head) available in the heating
system based on the flow rate.
0,6
0,5
0,4
0,3
0,2
0,1
0,0
0
200
400
Figure 4.4
0,6
0,5
0,4
0,3
0,2
0,1
0,0
0
200
400
600
Figure 4.5
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 sys-
tem decreases too much or totally stops
due to the closure of thermostatic valves or
circuit cocks, the by-pass guarantees a min-
imum circulation of water inside the primary
condensate exchanger.
The by-pass is calibrated for a differential
pressure of approx. 0.3-0.4 bar.
- 26 -
TECHNICAL SPECIFICATIONS
24-28 kW
600
800
1000 12001250
l/h
32 kW
800
1000
1200
1400
l/h
4.8 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 in-
crease.
Total capacity
Pre-load pressure
Useful capacity
Maximum system content *
Figure 4.6
* In conditions of:
• Max. average system temperature of
85°C
• Initial temperature when filling the system
10°C.
For systems with contents that
exceed the maximum system
content (indicated in the table),
a
supplementary
tank must be installed.
l
8.0
kPa
100
bar
1.0
l
4.0
l
124
expansion
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