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2.9 ANTIFROST PROTECTION
The boiler is equipped with an automatic anti-freeze function to protect the heating and DHW heating circuit of the
appliance from the cold temperatures.
When the water temperature in the heating circuit drops to 6°C, or the ambient temperature in which the boiler is
installed drops to 3°C, a first level of protection activates the pump making it run a four-minute cycle of circulation on
the heating circuit and a thirty-second cycle on the DHW circuit.
When the water temperature in the heating circuit falls below 5°C, a second level of protection activates the appliance
burner for a maximum period of sixty seconds, or until the temperature of the circuit goes back to 55°C for at least two
seconds.
If the temperature of the heating circuit drops to 2°C, or the temperature of the environment in which the boiler is
installed falls to 5°C, electrical resistances are activated to protect the DHW circuit.
The frost protection functions are guaranteed only if:
•
the appliance is constantly supplied with an adequate gas flow and is electrically powered;
•
the boiler is not blocked (error code);
•
the appliance is not damaged.
Under the above conditions the boiler is protected against freezing up to an ambient temperature of -20°C.
If the appliance is at risk of freezing due to very low temperatures or if it is not intended to be used for prolonged
periods, it is advisable to carry out an emptying procedure.
IMPORTANT
Particular care must be taken to also protect the condensate drainage system from freezing. It is
suggested the use of electric heating elements in particular for the domestic water supply pipes.
All pipes and connections at risk of freezing must be suitably insulated.
Frost damages are not covered by the warranty.
