Riello RTC-80 Series Installation, Operation And Service Manual page 34

INSTALLATION
Multi-Boiler Combination
SP
2
2
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
13 Siphon
14 Condensate outlet
LT (*)
CENTRAL
HEATING
RETURN
7
FLOW
LT
RETURN (**)
1
3
7
FLOW
LT
1 RETURN (**)
3
7
FLOW
LT
RETURN (**)
1
3
6
3
17
16 17 16
18
3
16
16 17 16
16
17 16
16
16
8
15 14
15 Drain
16 Isolation valve
17 Control valve
18 Air separator
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".
34
CENTRAL
HEATING SUPPLY
10
3
3
5
MAKE-UP
3
WATER
3 9
TC
3
11
19
10
3 3
12
WATER
INLET
15
3
5
4
3