Riello 20165080, Installation, Operation And Service Manual, Page: 31 / 56

31
INSTALLATION
Multiple Boiler Piping with Primary and Secondary Piping
8
8
8
16
16
16 17
17
17
17
18
15
3
10
12 3
3
15
6
3
3
3
11
3
3
3
10
9
5
7
7
7
13
3
5
4
3
4
4
4
TC
3
3
16
16
16 16
16
16
13
13
14
SP
1
1
1
FLOW
FLOW
FLOW
MAKE-UP
WATER
WATER
INLET
LT
RETURN (**)
LT
RETURN (**)
LT
RETURN (**)
LT (*) CENTRAL
HEATING
RETURN
CENTRAL
HEATING
SUPPLY
2
2
2
19
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
13 Siphon
14 Condensate outlet
15 Drain
16 Isolation valve
17 Non-return valve
18 Mixer tank
19 Pressure gauge
SP Sequencing panel
TC Control temperature
. _ . _ . Electrical signal
(*) 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".