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INST
ALLA
TION
TECHNICAL SPECIFICATIONS
4.6 Hydraulic characteristics
The hydraulic characteristics represent the
pressure (head) available in the heating
system based on the flow rate.
Figure 4.4
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
Head (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 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.
4.7 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.
Figure 4.5
Total capacity
l
8.0
Pre-load pressure
kPa 100
bar 1.0
Useful capacity
l
4.0
Maximum system content *
l
124
* 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 expansion
tank must be installed.
Summary of Contents for Basica Cond 25S
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