Hydraulic Data - Ariston Type C Installation, Servicing And Operating Instructions

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.
Pressure: 1 bar.
2.0
1.9
1,8
1.7
1.6
1.5
1.4
1.3
1.2
80°C
1.1
1.0
20 40
Pump Head Graph (15/50)
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
0 200 400
flow rate (l/hr)
Pump Head Graph (15/60)
flow rate (l/hr)
System capacity chart
50°C
60°C
70°C
60 80 100 120
System capacity (litres)
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.
600 800 1000 1200
40°C
140 160 180 200
1400
Fig. 10
220 240 260 280
Fig. 11
13