Chaffoteaux & Maury Minima HE System 24 Nat, Installation, Servicing And Operation Manual

Page: 13 / 64

0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0 200 400 600 800 1000 1200 1400
13
9. Hydraulic data
The boiler is fitted with an automatic by-pass as standard.
The graphs (Fig. 10) show the development of the pressure
available in relation to flow (on exit from the boiler).
To ensure correct operation, the minimum flow of the
appliance must be 300 l/h. (Thermostatic taps closed).
Capacity of the installation
.
The water heater is fitted with a pressurised expansion
vessel.
Maximum volume of expansion vessel: 6 litres.(24 kW)
7 litres.(30 kW)
Pressure: 1 bar.
The volume of the expansion vessel in a pressurised
appliance varies according to:
- the average operating temperature in °C
- the static height, which is the difference in metres between
the highest point of the appliance and the expansion vessel
axis.
The minimum cold filling pressure of the appliance is 0.8 bar
(recommended pressure between 1.0 and 1.5 bar).
The pressure of the expansion vessel should always be
greater than the static height (in metres) divided by 10.
20 40 60 80 100 120 140 160 180 200 220 240
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1,8
1.9
2.0
260 280
40
°
C
50
°
C
60
°
C
70
°
C
80
°
C
C
e
n
tr
a
l
h
e
a
ti
n
g
i
n
it
ia
l
p
re
s
s
u
re
w
h
e
n
c
o
ld
(
in
b
a
r)
Fig. 11
System capacity chart
System capacity (litres)
P
re
s
s
u
re
(
b
a
r)
flow rate (l/hr)
P
re
s
s
u
re
(
b
a
r)
flow rate (l/hr)
Pump Head Graph (15/50)
Pump Head Graph (15/60)
Fig. 10