6
2
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
1.2 MAIN DIMENSIONS.
Key:
G - Gas supply
AC - Domestic hot water outlet
ACV - Solar valve kit DHW inlet (Optional)
AF - Domestic cold water inlet
R - System return
M - System flow
V - Electrical connection
VS - Safety valve drain
Height
(mm)
Width (mm) Depth (mm)
781
440
240
CONNECTIONS
GAS
DOMESTIC
HOT WATER
SYSTEM
G
AC
AF
R
M
3/4”
1/2”
1/2”
3/4”
3/4”
N.B.: connection group (Optional)
1.3 ANTIFREEZE PROTECTION.
Minimum temperature -5°C.
The boiler comes
standard with an antifreeze function that ac-
tivates the pump and burner when the system
water temperature in the boiler falls below 4°C.
The antifreeze function is only guaranteed if:
- the boiler is correctly connected to gas and
electricity power supply circuits;
- the boiler is powered constantly;
- the boiler is not in ignition failure block (
Par.
2.3
);
- the boiler essential components are not faulty.
In these conditions the boiler is protected against
freezing to an ambient temperature of -5°C.
Minimum temperature -15°C.
If the boiler is
installed in a place where the temperature falls
below -5°C and in the event there is no gas or
the boiler goes into failed ignition block, the
appliance can freeze.
To prevent the risk of freezing follow the instruc-
tions below:
- protect the central heating circuit from freezing
by inserting a good-quality antifreeze liquid
into this circuit, which is specially suited for
central heating systems and which is manu-
facturer guaranteed not to cause damage to
the heat exchanger or other components of
the boiler. The antifreeze liquid must not be
harmful to one's health. The instructions of the
manufacturer of this liquid must be followed
scrupulously regarding the percentage neces-
sary with respect to the minimum temperature
at which the system must be kept.
Warning:
the excessive use of glycol could jeop-
ardise the proper functioning of the appliance.
An aqueous solution must be made with potential
pollution class of water 2 (EN 1717:2002 or local
standards in force).
The materials used for the central heating circuit of
Immergas boilers withstand ethylene and propyl-
ene glycol based antifreeze liquids (if the mixtures
are prepared perfectly).
For life and possible disposal, follow the suppli-
er's instructions.
- Protect the domestic hot water circuit against
freezing by using an accessory that is supplied
on request (antifreeze kit) comprising two
electric heating elements, the relevant wiring
and a control thermostat (carefully read the
installation instructions contained in the ac-
cessory kit pack).
Boiler antifreeze protection is thus ensured only if:
- the boiler is correctly connected to gas and elec-
tricity power supply circuits and powered;
- the main switch is engaged;
- the anti-freezing kit components are efficient.
In these conditions the boiler is protected against
freezing to temperature of -15°C.
The warranty does not cover damage due to inter-
ruption of the electrical power supply and failure
to comply with that stated on the previous page.
NOTE:
if the boiler is installed in places where
the temperature falls below 0°C the domestic
hot water and central heating attachment pipes
must be insulated.
1.4 BOILER CONNECTION UNIT.
The connection unit consisting of all the nec-
essary parts to perform the hydraulic and gas
system connections of the appliance comes as
optional.
1.5 GAS CONNECTION.
Our boilers are designed to operate with meth-
ane gas (G20) or LPG. Supply pipes must be the
same as or larger than the 3/4”G boiler fitting.
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 con-
verted for operation with the other type of gas
(see converting appliance for other gas types). It
is also important to check the dynamic pressure
of the mains (methane or LPG) used to supply
the boiler, which must comply with UNI EN 437
and its attachment, as insufficient levels may
reduce generator output and cause discomfort
to the user.
