Riello RTC-80 Series Installation, Operation And Service Manual page 30

INSTALLATION
Multiple Boiler Piping Schematic with Sequencing Panel
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
15 Drain
LT (*)
CENTRAL
HEATING
RETURN
7
HT
RETURN
1
LT
RETURN (**)
3
7
HT RETURN
1
16
LT
RETURN (**)
3
7
HT RETURN
1
16
LT
RETURN(**)
3
8
15
HT (*) 6
3
CENTRAL
HEATING
3
RETURN
18
3
3
14 15
16 Isolation valve
17 Non-return valve
18 Air separator
19 Motorized isolation valve
20 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".
30
10
5 MAKE-UP
3
WATER
CENTRAL
3
5
HEATING
4 4
SUPPLY
TC
3
9 3
11
20
10
3
3 12
WATER
INLET