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If the outdoor unit is to be installed in a place where the minimum temperature can fall below -15°C (down to -25°C) to avoid the
risk of freezing, an antifreeze liquid must be introduced.
Freeze protection of the outdoor and indoor units by means of the antifreeze function (including -15°C protection of the DHW cir-
cuit with resistance kit) is ensured only if:
- The units and the control panel are correctly connected to the power supply circuit, the gas supply circuit and constantly supplied and
connected to each other;
- The indoor unit is not in "off" mode;
- The indoor and outdoor units are not malfunctioning (Par.2.12);
- The antifreeze unit and/or kit essential components are not faulty.
Outdoor Unit Protection.
- Frost protection of the outdoor unit is only guaranteed by using an antifreeze liquid.
- In this case it will be necessary to disable the antifreeze protection functions; set "O.U. antifreeze function" = "Level 2" (Parag. 3.6).
- In the presence of antifreeze liquid, the outdoor unit is protected down to a minimum temperature of -25°C.
If the outdoor unit is installed in an area with temperature <-5°C and high relative humidity for at least three consecutive days,
it is necessary to install the optional outdoor unit condensation antifreeze resistance kit to prevent freezing of the floor with
condensation drainage.
- 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 units.
The antifreeze liquid must not be harmful to one's health.
- The materials used for the central heating circuit of Immergas units resist ethylene and glycol based antifreeze liquids (if the mixtures
are prepared perfectly). Adding glycol lowers the freezing point of water.
- The required concentration depends on the lowest expected outside temperature, in any case not below -25°C, and whether or not the
risk of bursting or freezing of the system is to be prevented. More glycol is required to prevent the system from freezing. Add glycol
according to the indications of the table below.
- An aqueous solution must be made with potential pollution class of water in compliance with the local standards in force.
- For life and possible disposal, follow the supplier's instructions.
Protection from risk of bursting: glycol prevents the pipes from bursting, but it does NOT prevent freezing of the liquid they
contain.
Protection from risk of freezing : glycol prevents freezing of the liquid contained inside the pipes.
Lowest expected external temperature
–5°C
–10°C
–15°C
–20°C
–25°C
• The required concentration may vary according to the type of glycol. ALWAYS compare the requirements of the table above
with the specifications provided by the glycol manufacturer. If necessary, comply with the requirements provided by the
glycol manufacturer.
• The concentration of additional glycol must NEVER exceed 35%.
• If the liquid in the system should feeze, the pump will NOT be able to start. Remember that the risk of freezing of the liquid in
the system is present if even if the bursting risk of the system is prevented.
The presence of glycol may trigger corrosion of the system, since glycol without inhibitors becomes acid under the influence of
oxygen. The process is accelerated by the presence of copper and high temperatures. Non-inhibited acid glycol affects metallic
surfaces and creates galvanic corrosion cells that cause serious damage to the system.
Prevention from risk of bursting
10%
15%
20%
25%
30%
Prevention from risk of freezing
15%
25%
35%
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