20
ANTIFREEZE FUNCTION
In case the delivery probe measures a temperature lower than 7°C, the circulator is
activated. If the temperature goes down the value of 4°C, the primary exchanger (boiler
body) is turned on until bringing the outlet temperature to 20°C. The antifreeze function is
active also with the boiler turned OFF (function in standby mode but with bright switch on).
TANK REQUEST (JP9 = 0 - P8 = 0)
Standby or with simultaneous heating request:
In this case, if the temperature measured by the tank probe is lower than the tank setpoint
-1°C, is activated the control G5 related to the tank resistance. When the temperature at
the tank sensor is higher than the boiler setpoint G5 control is turned off. The activation of
G5 causes the shutdown of the G2 or G4 (2 kW) in such a way that the maximum total
consumption of the system can always be 12 kW.
Sanitary flow meter request:
When receiving a request by the sanitary flow switch, the resistance related G5 control (2 kW)
the boiler is activated independently until the storage tank temperature remains below 70°C.
In ECO mode is not activated any of the primary exchanger resistance.
In COMFORT mode simultaneously G1 commands are also controlled, G2, G3, G4
relative to the primary exchanger bringing the supply temperature to the boiler se
differential set using parameter P7. At the end of the request, the circulator remains
powered for a time equal to the value set by parameter P3.
Pre-heat exchanger primary:
In condition of stand-by with active COMFORT function, the primary exchanger is
maintained in temperature in order to ensure a prompt response of sanitary. The main
heat exchanger is maintained at a temperature equal to the setpoint plus a kettle
temperature difference settable by means of the parameter P7. The maximum power
used to manage this phase is 6 kW.
ANTILEGIONELLA FUNCTION
The system continuously monitors the temperature of the kettle. If within a certain time
interval the temperature does not reach the value of 65°C, the tank resistance is
automatically ignited in order to avoid bacterium growth.
The operating time of the legionella function is 3 hours from the first ignition and then
every 7 days.
