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Technical information
4.3
Hydraulic specifications
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 (44 on page 13)
and the system, when cold, by 0.1 bar for each
additional 1m.
kPa bar
60 0.6
50 0.5
40 0.4
30 0.3
For 24 Kw and 28 Kw
10 0.1
0 0.0
0
200
400
600
800
1000
1200
1400
l/h
l
6,0
Pre--- load pressure
kPa
100
bar
1,0
l
94
Maximum volume of water
in the system *
For 32 Kw
Fig. 4.3
The hydraulic specifications in Fig. 4.3 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.
Output with thermostat cocks shut off
The boiler is fitted with an automatic by--- pass
valve (45 on page 13), which protects the primary
heat exchanger.
In case of excessive reduction or total blockage of
water circulation in the central heating system
owing to closure of the thermostatic valves or system component cocks, the by--- pass valve ensures a minimum flow of water through the primary
heat exchanger.
4.4
Capacity
Expansion vessel
Note: this boiler is designed for operation only
in a sealed central heating system
Capacity
l
7,0
Pre--- load pressure
kPa
100
Maximum volume of water
in the system *
bar
1,0
l
109
Tab. 4.1
* Where conditions are:
--- Average maximum temperature of the system
is 85°C
--- Initial temperature when filling up the system is
10°C
For systems (24 Kw and 28 Kw) with volumes
greater than 94 l, an additional expansion vessel
must be provided.
For systems (32 Kw) with volumes greater than
109 l, an additional expansion vessel must be provided.
15
INSTALLATION
20 0.2