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4.3
Hydraulic specifications
The hydraulic specifications in Fig. 4.3 and
Fig. 4.4 represent the pressure (available
head for the central heating system) as a
function of the flow rate.
The load loss due to the boiler has already
been subtracted.
kPa bar
0.6
60
50
0.5
40
0.4
30
0.3
20
0.2
10
0.1
0
0.0
0
200
400
600
Fig. 4.3
model M110B.24SM/...
kPa bar
0.6
60
50
0.5
40
0.4
30
0.3
20
0.2
10
0.1
0
0.0
0
200
400
Fig. 4.4
model M110B.32SM/...
Operation of integral By-pass valve
The boiler is equipped with an automatic by-
pass valve (45on page 24), which protects
the condensing primary exchanger.
The integral automatic by-pass will ensure
a minimum flow through the primary heat
exchanger of the boiler in the event that
the flow around the central heating circuit is
restricted due to closure of thermostatic or
system control valves.
TECHNICAL INFORMATION
800
1000 1200 1400
l/h
600
800
1000 1200 1400
l/h
4.4
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.
Capacity
Pre-load pressure
Maximum volume of water in the
system *
Fig. 4.5
* Where conditions are:
• Average maximum temperature of the sys-
tem is 85 °C
• Initial temperature when filling up the sys-
tem is 10 °C
For systems with volumes great-
er than 109 l, an additional ex-
pansion vessel must be provid-
ed.
l
7,0
kPa
100
bar
1,0
l
109
- 25 -
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