Riello RTC-80 Series Installation, Operation And Service Manual page 29

Single Boiler Combination Heating & Domestic Water Plant
LT (*)
CENTRAL
HEATING
RETURN
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
HEATING
RETURN
3
24
3
16 17 16
3
24
3
16
7
HT
RETURN
1
6
3 10
5
3 3
3
3 9
18
3
3
11
16
LT RETURN (**)
10
3 12 3
WATER
25
INLET
3
13
8
15
15
14
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 3-way valve
24 Central heating system manifold
25 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".
29
3 3
5 5
4 4
4
23
CENTRAL
HEATING
3 3 SUPPLY
24
3
21
MAKE-UP
WATER
3 12 10 3
DHW USER
POINTS
3
4
5
3
3
4
5
3
19
20
INSTALLATION
6 22
INLET