10
1.4.
Operating the boiler
1.4.1.
Switching on
It is presumed that the boiler has been installed by a qualified fitter, it has been used before and is ready to operate
correctly.
• Open the gas cock;
• Turn the master switch to ON – the LCD light up and shows the active function (see table 1);
• Choose the boiler mode via selector 2 (fig. 1): OFF/SUMMER/WINTER/ANTI-FREEZE;
• Set the temperature for the heating system on regulator 4 (fig. 1);
• Set the DHW temperature on regulator 3 (fig. 1);
• Set the ambient temperature on the (optional) thermostat
IMPORTANT
If the boiler is not used for a long time, particularly when it runs on propane gas, ignition may be difficult. So, before starting the
boiler, switch on a different gas-fired device (e.g. a cooking ring).
Note that the boiler may still shut down a couple of times. If this happens, turn selector 2 (fig. 1) to the RESET
position for a few
seconds, then back to the desired position.
1.4.2.
CH function
Set desired CH water temperature via no. 4 knob (fig. 1);
CH water temperature adjusting range depends on selected operation range:
• standard range: from 20°C to 78°C (from full counter-clockwise position to full clockwise position);
• reduced range: from 20°C to 45°C (from full counter-clockwise position to full clockwise position).
Operation range choice is to be selected by the fitter or a qualified Service Centre.
During temperature setting, the CH symbol on the LCD flashes and the CH setting is displayed.
When the CH system requests heat, the LCD shows the (fixed) CH symbol and the temperature of the CH water.
The burner symbol only shows while the burner is operating.
To prevent frequent ignition and switching off in central heating mode, boiler is programmed to have a waiting
time between subsequent ignitions which depends on the selected operating range.
• standard range: 4 minutes;
• reduced range: 2 minutes.
Should water temperature in the system fall below the default value, waiting time procedure is aborted and boiler re-ignited (see par. 3.2.11).
1.4.3.
DHW function
The boiler always gives priority to DHW demand over the CH function.
The boiler is equipped with the AQUA PREMIUM system, which combines the instantaneous production of domestic hot water with a storage
function.
1.4.3.1. AQUA PREMIUM system
The boiler comes with a 25-litre stratification storage tank and a secondary plate heat exchanger.
The boiler can either function as a standard instantaneous boiler, when the storage tank is deactivated, or with the innovative Aqua Premium
system, when the storage tank is switched on.
The storage tank function is controlled via regulator 3 (fig. 1).
When regulator 3 is turned fully anticlockwise, the storage tank symbol is displayed. Then turn regulator 3 clockwise
until a setting of at least 40°C is reached.
To deactivate the water storage tank function, turn regulator 3 fully anticlockwise until the symbol disappears, then
back to a setting of at least 40°C.
The temperature range is 35-57°C (from the fully anticlockwise to the fully clockwise position of regulator 3).
During temperature setting, the DHW symbol on the LCD flashes and the water temperature is displayed.
In Aqua Premium mode, when a hot water tap is turned on, the flow switch cuts off the supply of water. The boiler
switches on, the cutoff valve opens and the DHW pump activates (the pump flow rate is fixed).
When DHW demand is less than the pump’s flow rate, water to the tap is only supplied by the secondary plate heat exchanger and excess
DHW is deviated to the storage tank.
When the DHW demand exceeds the flow rate, water produced by the secondary heat exchanger is added to that from the storage tank. This
gives a higher hot water flow than the one produced by instantaneous boilers with an identical thermal output and traditional ones with a
storage tank of the same capacity.
