Riello RTC-80 Series Installation, Operation And Service Manual page 32

INSTALLATION
Multiple-Boiler Piping with Motorized Sequencing Valves
FLOW
2
FLOW
2
FLOW
2
1 Boiler
2 Burner
3 Isolation valves
4 Central heating system pump
5 Non-return valves
6 Automatic vent valve
7 Boiler safety valve
8 Boiler drain valve
9 Y strainer
10 Pressure reducer
11 Expansion tank
12 Water softener filter
7
LT
RETURN (**)
1
16
3
7
LT
RETURN (**)
1
16
3
7
LT
RETURN (**)
RIT BT
1
16
3
CENTRAL
17 HEATING
16
RETURN
17
16
17
16
15 15
14
13 Siphon
14 Condensate outlet
15 Drain
16 Isolation valve
17 Motorized sequencing valve
18 Pressure gauge
(*) LT= Low Temperature/HT= High Temperature
(**) On the RTC 1000-80 to RTC 4700-80 the low
temperature heating return is located on the top
of the boiler. See "Single Boiler Piping Schematic
Type A".
32
CENTRAL
HEATING
SUPPLY
18
10
3 12 3
WATER
INLET