4
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2
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V
AC
AF
R
SC
M
4
5
10
INS
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1.4 ANTIFREEZE PROTECTION.
Minimum temperature -5°C.
The boiler comes
standard with an antifreeze function that activates the
pump and burner when the system water temperature
in the boiler falls below 4°C.
In these conditions the boiler is protected against freez-
ing to an ambient temperature of -5°C.
Minimum temperature -15°C.
If the boiler is installed in a
place where the temperature drops below -5°C, the appliance
may freeze.
To prevent the risk of freezing follow the instructions 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
manufacturer 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 strictly followed
regarding the necessary percentage with respect to the min-
imum temperature at which the system must be kept.
N.B.:
the excessive use of glycol could jeopardise the proper
functioning of the appliance.
An aqueous solution must be made with potential pollution
class of water 2 (EN 1717:2002).
The materials used for the central heating circuit of Immergas
boilers resist ethylene and propylene glycol based antifreeze
liquids (if the mixtures are prepared perfectly).
For life and possible disposal, follow the supplier's instruc-
tions.
- Protect the domestic hot water circuit against freezing by
using an accessory that is supplied on request (anti-freeze
kit) comprising two electric heating elements, the relevant
cables and a control thermostat (carefully read and follow the
installation instructions contained in the accessory kit pack).
In these conditions the boiler is protected against freezing to
temperature of -15°C.
Boiler antifreeze protection (both -5°C and -15°C) is thus
ensured only if:
- the boiler is correctly connected to gas and electricity power
supply circuits;
- the boiler is powered constantly;
- the boiler is not in “off ” mode;
- the boiler is not in anomaly conditions (Par. 2.5);
- the essential components of the boiler and/or antifreeze kit
are not faulty.
The warranty does not cover damage due to interruption of the
electrical power supply and failure to comply with that stated
on the previous page.
N.B.: if the boiler is installed in places where the temper-
ature falls below 0°C, it is required both the insulation of
domestic hot water and central heating attachment pipes
and the insertion of anti-freeze liquid in the central heating
circuit / C.H. circuit.
Note: the antifreeze systems described in this chapter are
only to protect the boiler. The presence of these functions
and devices does not exclude the possibility of parts of the
system or domestic hot water circuit outside the boiler from
freezing.
Water flow rate (l/h)
H
ea
d l
os
se
s (kP
a)
1.5 BOILER CONNECTION UNIT.
The connection unit, which is composed of all the required ac-
cessories to connect the appliance's hydraulic and gas system, is
furnished as an optional kit, except for the cycloidal filter unit
and its pipes (standard supplied) and to be installed on the system
return. Make the connections according to the arrangement of
(Fig. 4) and based on the type of installation to be made.
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
4 - Cycloidal filter unit
