Hydraulic Specifications; Expansion Vessel - Biasi RIVA ADVANCE HE M110B.24SM/C User Manual And Installation Instructions

4.5

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 23), 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
- 28 -
TECHNICAL INFORMATION
800 1000 1200 1400
l/h
600 800 1000 1200 1400
l/h
system control valves.
4.6

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