7
CAVO
ALIMENTAZIONE 1-3
INSTALLERUSER
MAINTENANCE TECHNICIAN
1.4 GAS CONNECTION.
Our boilers are designed to operate with methane
gas (G20) and LPG. Supply pipes must be the
same as or larger than the 1/2”G boiler tting.
Before connecting the gas line, carefully clean
inside all the fuel feed system pipes to remove
any residue that could impair boiler eciency.
Also make sure the gas corresponds to that for
which the boiler is prepared (see boiler data
name plate). If dierent, the appliance must be
converted for operation with the other type of
gas (see converting appliance for other gas types).
e dynamic gas supply (methane or LPG) pres-
sure must also be checked according to the type
used in the boiler, which must comply with the
technical standards in force and relevant annexes,
as insucient levels can reduce generator output
and cause malfunctions.
Ensure correct gas cock connection. e gas sup-
ply pipe must be suitably dimensioned according
to current regulations in order to guarantee cor-
rect gas ow rate to the burner even in conditions
of maximum generator output and to guarantee
appliance eciency (technical specications).
e coupling system must conform to technical
standards in force.
Fuel gas quality. e appliance was designed
to operate with combustible gas free of impuri-
ties; otherwise it is advisable to t special lters
upstream of the appliance to restore the purity
of the fuel.
Storage tanks (in case of supply from LPG
depot).
- New LPG storage tanks may contain residual
inert gases (nitrogen) that degrade the mixture
delivered to the appliance casing functioning
anomalies.
- Due to the composition of the LPG mixture,
layering of the mixture components may occur
during the period of storage in the tanks. is
can cause a variation in the heating power of
the mixture delivered to the appliance, with
subsequent change in its performance.
1.5 HYDRAULIC CONNECTION.
Attention: in order not to void the condensa-
tion module warranty, before making the boiler
connections, carefully wash the heating system
(pipes, radiators, etc.) with special pickling or
descaling products to remove any deposits that
could compromise correct boiler operation.
A chemical treatment of the thermal system wa-
ter is required, in compliance with the technical
standards in force, in order to protect the system
and the appliance from deposits (e.g., lime scale),
slurry or other hazardous deposits.
Water connections must be made in a rational
way using the couplings on the boiler template.
e boiler safety valves outlet must be connected
to a draining funnel. Otherwise, the manufactur-
er declines any responsibility in case of ooding
if the drain valve cuts in.
Attention: Immergas declines all liability in the
event of damage caused by the inclusion of auto-
matic lling that is not its own brand.
In order to meet the system requirements es-
tablished by the technical regulation in force in
relation to the pollution of drinking water, we
recommend installing the IMMERGAS anti-
backow kit to be used upstream of the cold
water inlet connection of the boiler. It is also
recommended that the heat transfer uid (e.g.
water + glycol) entered in the primary circuit
of the boiler (heating circuit), complies with the
local regulations in force.
Attention: to preserve the duration and the ef-
ciency features of the appliance, in the presence
of water whose features can lead to the deposit of
scale, installation of the “polyphosphate dispenser”
kit is recommended.
Condensate drain. To drain the condensate
produced by the appliance, it is necessary to
connect to the drainage system by means of acid
condensate resistant pipes, with an internal Ø of
at least 13 mm. e system connecting the appli-
ance to the drainage system must be carried out
in such a way as to prevent freezing of the liquid
contained in it. Before appliance ignition, ensure
that the condensate can be correctly removed.
Aer rst ignition, check that the drain trap is
lled with condensate (para. 1.21). Also, comply
with national and local regulations on discharg-
ing waste waters.
1.6 ELECTRICAL CONNECTION.
e boiler has an IPX4D protection rating for the
entire appliance. Electrical safety of the appliance
is reached only when it is correctly connected to
an ecient earthing system as specied by cur-
rent safety standards.
Attention: Immergas S.p.A. declines any respon-
sibility for damage or physical injury caused by
failure to connect the boiler to an ecient earth
system or failure to comply with the reference
standards.
Also ensure that the electrical installation cor-
responds to maximum absorbed power specica-
tions as shown on the boiler data-plate. Boilers
are supplied complete with an “X” type power
cable without plug. e power supply cable must
be connected to a 230V ±10% / 50Hz mains sup-
ply respecting L-N polarity and earth connection;
, this network must also have a multi-pole cir-
cuit breaker with class III over-voltage category.
When replacing the power supply cable, contact
a qualied rm (e.g. the Authorised Aer-Sales
Technical Assistance Service). e power cable
must be laid as shown (Fig. 1-3).
In the event of mains fuse replacement on the
P.C.B., use a 3.15A quick-blow fuse. For the main
power supply to the appliance, never use adapt-
ers, multiple sockets or extension leads.
If during connection the L-N polarities are not
respected, the boiler does not detect ame pres-
ence and goes into ignition block.
Warning: even where L-N polarity is not com-
plied with, if there is temporary residual voltage
exceeding 30V on the neutral the boiler might
still operate (but only temporarily). Measure the
voltage using appropriate instruments, without
trusting the voltage tester screwdriver.
Installation with system operating at direct
low temperature. e boiler can directly feed a
low temperature system by acting on the jumper
(8 Fig. 3-4) and by setting the ow temperature
adjustment range from 50 ÷ 20°C (Para. 3.17). In
this situation it is good practice to insert a safety
device in series with the power supply and boiler.
is device is made up from a thermostat with
a temperature limit of 60°C. e thermostat
must be positioned on the system delivery pipe
at a distance of at least 2 metres from the boiler.
SUPPLY
VOLTAGE CABLE
