Riello RTC-80 Series Installation, Operation And Service Manual page 33

Two-Boiler Combination Heating & Domestic Water Plant
SP
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
13 Siphon
14 Condensate outlet
15 Drain
16 Isolation valve
HT (*) CENTRAL LT (*) CENTRAL
HEATING HEATING
RETURN RETURN
16
7
HT
RETURN
1 LT
16
RETURN (**)
3
16
7
HT
RETURN
LT
1 RETURN (**)
16
3
14
6
3
5
3
16 17 16
18 TC
3
3
11
16 17 16
20
15 15
17 Non-return valve
18 Air separator
19 Domestic water storage tank
20 Storage tank drain valve
21 DHW circuit expansion tank
22 Storage tank safety valve
23 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".
33
CENTRAL
10
HEATING
3
SUPPLY
3 MAKE-UP
WATER
3
9
3
4 5 3
3 12 10 3
5
23 10
3 12 3
WATER
INLET
DHW USER
POINTS
3
4
5
3
19 19
INSTALLATION
6 22
21
INLET