Riello 20118250, Installation And Maintenance Manual

Page: 18 / 64

18
INSTALLATION
2.7 Boiler water circuit
EAF
UAC
9
7
6
5
1
2
3
4
8
D C
A
6
10
7
4
E
RL
B
MI
RI
1 Boiler body
2 Automatic vent valve
3 Pump
4 Safety valve
5 Burner
6 Expansion tank
7 Drain cock
8 3-way diverting valve
9 Storage cylinder
10 Storage cylinder fill cock
A Safety thermostat
B Delivery temperature probe
C Pressure transducer
D Return temperature probe
E Boiler sensor
MI Central heating flow
RI Central heating return
UAC Domestic hot water outlet
RL Domestic recirculation (preset)
EAF Domestic cold water inlet
2.8 Typical system schematic
Typical installation schematic
UAC
RL
EAF
RI
MI
1
4 3
9
8
7
2
1
1
1
1
1 6 5
EAF
1 Disconnect valves
2 CH radiator
3 DHW circulation pump
4 Non-return valve
5 Pressure reducer
6 Water softener filter
7 Safety valve drain
8 Central heating circuit and storage cylinder drains
9 DHW user
MI Central heating flow
RI Central heating return
UAC Domestic hot water outlet
RL Domestic recirculation (preset)
EAF Domestic cold water inlet
9
Do not use a check valve in the hydraulic connections to the
heating system consumption points.
9
The safety valves must be connected to a suitable collection
and drain system.
9
The selection and the installation of the components of the
system is the responsibility of the installer, who must op-
erate in accordance with good practice and current Legis-
lation.
9
If needed, water supplies and recovery circuits must be
conditioned by suitable treatment systems. Refer to the val-
ues listed in the table on page 23.
0
It is prohibited to operate the circulators without water.