Ariston HS C 24 FF NG Installation And Servicing page 52

INSTALLATION
Water connection
The illustration shows the connections for the water and gas
attachments of the boiler.
Check that the maximum water mains pressure does not exceed
6 bar; if it does, a pressure reducing valve must be installed.
View of the Boiler Connections
F
B
A
A. Central heating Flow
B. Domestic Hot Water Outlet
C. Gas Inlet
D. Domestic Cold Water Inlet
E. Central Heating Return
F. Safety Valve Discharge
G. Filling valve
H. Drain Valve
Residual Head of the
Boiler ∆T 20°C
For the measuring of the pipes and of the heating bodies in the
heating system, the residual head value should be calculated
as a function of the requested flow rate, in accordance with the
values shown in the circulation pump graph.
5
4,5
4
3,5
3
2,5
2
1,5
1
0,5
0
0 100 200 300 400
Cleaning the heating system
Where the boiler is used in conjunction with an older system, various
substances and additives may be present in the water and these could
have an adverse effect on the operation and durability of the new boiler.
Before replacing the old boiler, you must arrange for the system to
be cleaned thoroughly in order to eliminate any residue or dirt which
could compromise the correct operation of the water heater. Make sure
the capacity of the expansion vessel is suited to the amount of water
contained in the system.
52 /
G
D
C E
H
500 600 700 800 900 1000
[l\h]
Excessive pressure device
Fit the drain pipe for safety valve "F", included in the hydraulic
kit. The excessive pressure device outlet must be connected
to a drainage siphon which can be checked visually in order
to prevent maintenance procedures causing harm to people,
animals or property (the manufacturer shall not be held
responsible for any such damage).
Water circuit diagram
1
2
4
6
8
9
10
11
A B
Legend:
1. Fan
2. Main Heat Exchanger
4. Central Heating Flow
Temperature Probe
5. Burner
6. Ignition Electrodes
7. Gas Valve
8. Secondary exchanger
9. Safety valve
10. Automatic By-pass
11. Drain valve
12. D.H.W. Flow meter
13. D.H.W. circuit filter
14. Inlet valve
15. C.H. Filter
16. Diverter valve
17. Pressure Gauge
18 Minimum pressure switch
19. Circulation Pump with air release valve
20. Detection electrode
21. Expansion vessel
22. Central Heating Return Temperature Probe
23. Air Pressure Switch
23
22
21
20
19
18
17
16
15
14
C
D E
12 13