1
2
3
G
V
AC
AF
R
SC
M
7
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
11
1.6 BOILER CONNECTION UNIT.
The connection unit consisting of all the necessary parts to per-
form the hydraulic and gas system connections of the appliance
comes as optional kit, perform the connections respecting the
arrangement of
Fig. 7
based on the type of installation to be made.
1.7 GAS CONNECTION.
Our boilers are designed to operate with methane gas (G20) and
L.P.G. Supply pipes must be the same as or larger than the 3/4”G
boiler fitting.
ATTENTION:
Before connecting the gas line, carefully
clean inside all the fuel feed system pipes
to remove any residue that could impair boiler
efficiency. Also make sure the gas corresponds
to that for which the boiler is prepared (see
boiler data nameplate). If different, the boiler
must be converted for operation with the other
type of gas (see converting appliance for other
gas types). It is also important to check the dy-
namic pressure of the mains (methane or LPG)
used to supply the boiler, which must comply
with EN 437 and its attachment, as insufficient
levels may reduce generator output and cause
discomfort to the user.
Ensure correct gas cock connection.
Key:
V - Electrical connection
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic hot water inlet
SC - Condensate drain
(minimum internal diameter Ø 13 mm)
M - System flow
R - System return
1 - System filling valve
2 - System draining valve
3 - 3 bar safety valve drain fitting signal
According to local regulations in force,
make sure that a gas cock is installed
upstream of each connection between
the appliance and the gas system. This cock,
if supplied by the appliance’s manufacturer,
can be directly connected to the appliance
(i.e. downstream from the pipes connecting
the system to the appliance), according to the
manufacturer’s instructions.
The Immergas connection unit, supplied as
an optional kit, also includes the gas cock,
whose installation instructions are provided
in the kit.
In any case, make sure the gas cock is connect-
ed properly.
The gas supply pipe must be suitably dimensioned according to
current regulations in order to guarantee correct gas flow rate to
the burner even in conditions of maximum generator output and
to guarantee appliance efficiency (technical specifications). The
coupling system must conform to standards in force (EN 1775).
ATTENTION:
the appliance is designed to operate with
fuel gas free from impurities; otherwise
it is advisable to fit special filters upstream of
the appliance to restore the purity of the fuel.
