Hydraulic Specifications; Expansion Vessel - Biasi RIVA PLUS HE 24C ERP User Manual And Installation Instructions

4.3

Hydraulic specifications

The hydraulic specifications in Fig. 4.3 rep-
resent 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
Output with thermostat cocks shut off
The boiler is equipped with an automatic by-
pass valve (45on page 28), which protects
the condensing primary exchanger.
In case of excessive reduction or total
blockage of water circulation in the cen-
tral heating system owing to closure of the
thermostatic valves or system component
cocks, the by-pass valve ensures a mini-
mum flow of water through the primary heat
exchanger.
TECHNICAL INFORMATION
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. 4.4
* Where conditions are:
• Average maximum temperature of the
system is 85 °C
• Initial temperature when filling up the sys-
tem is 10 °C
For systems
greater than 124l, an additional
expansion vessel must be pro-
vided.
l 8,0
kPa 100
bar 1,0
l 124
with volumes
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