Riello RTC-80 Series Installation, Operation And Service Manual page 31

Multiple Boiler Piping with Primary and Secondary Piping
SP
FLOW
2
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
7
LT
RETURN (**)
1
3
7
LT
RETURN (**)
1
3
7
LT
RETURN (**)
1
3
14
4
4
4
15
15
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".
31
6
MAKE-UP
10
3
WATER
5
3 3
3
CENTRAL
HEATING
SUPPLY
3 9
TC
3
11
LT (*) CENTRAL
HEATING
RETURN
19
10
12 3
3
WATER
INLET
INSTALLATION
3
5
4
3