8
Externa 30 O
Cod. 3540T540 - 04/2009 (Rev. 00)
It is recommended to fit on-off valves between the boiler and the central heating system; these allow
the boiler to be isolated from the heating system, if necessary.
Make the connections to the boiler in a way that its internal tubing is not subject to stress.
fig. 3a
The connection kit shown in fig. 4a and 4b can be supplied upon request.
In the boiler
From the system
From the system
In the boiler
From the system
In the boiler
In the boiler
From the system
A
F
C D E
F
E
D
B
C
A
Connection with cocks
Connection with nipples
A
Female pipe coupling
C
OR gasket
D
OT 58 stop ring
E
Copper washer
F
OT 58 connecting pipe
G
Ball cock
A
Female pipe coupling
B
OT 58 nipple
C
OR gasket
D
OT 58 stop ring
E
Copper washer
F
OT 58 connecting pipe
G
fig. 4a
fig. 4b
Key
1
CH flow, 3/4”
2
Filling
cock
3
Gas inlet, 1/2”
4
CH return, 3/4”
5
Pressure relief valve discharge
46,5
95 54
223,5
141
1
2 3
4
5
236,5
326,5
85
99
Gas inlet
3
Conical
ISO 7-1
Gasket
fig. 3b
Mount threaded adapter
before installation
