Riello RTC-80 Series - Page 32

32
INSTALLATION
Multiple-Boiler Piping with Motorized Sequencing Valves
RIT BT
15
10
12
3
16
16
16
16
16
16
17
17
17
3
15
7
7
7
8
13
3
8
13
3
13
14
8
3
1
1
1
CENTRAL
HEATING
RETURN
CENTRAL
HEATING
SUPPLY
WATER
INLET
LT
RETURN (**)
LT
RETURN (**)
LT
RETURN (**)
FLOW
FLOW
FLOW
2
2
2
18
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 lter
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".