Technical information
11
4.3
Hydraulic specifications
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0
200
400
600
800
1000 1200 1400
0
10
20
30
40
kPa bar
l/h
60
50
Fig. 4.3 model M110B.24SR/...
The hydraulic specifications in Fig. 4.3 represent
the pressure (available head for the central heat-
ing system) as a function of the flow rate.
The load loss due to the boiler has already been
subtracted.
Operation of integral By---pass valve
The boiler is fitted with an automatic by---pass
valve (38 on page 9), which protects the primary
heat exchanger.
The integral automatic by---pass will ensure a mini-
mum flow through the primary heat exchanger of
the boiler in the event that the flow around the cen-
tral heating circuit is restricted due to closure of
thermostatic or system control valves.
4.4
Expansion vessel
Note: this boiler is designed for operation only
in a sealed central heating system
The height difference between the pressure relief
valve and the highest point in the system may be
10m at most.
For greater differences, increase the pre---load
pressure in the expansion vessel (37 on page 9)
and the system, when cold, by 0.1 bar for each
additional 1m.
Capacity
l
7,0
Pre---load pressure
kPa
bar
100
1,0
Maximum volume of water
in the system *
l
109
Tab. 4.1
* Where conditions are:
---
Average maximum temperature of the system
is 85
q
C
---
Initial temperature when filling up the system is
10
q
C
For systems with volumes greater than 109 l, an
additional expansion vessel must be provided.
IN
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