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 (fig. 1) light up and shows the active function (see table 1)
OFF/SUMMER/WINTER/ANTI-FREEZE;
• 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 cooker).
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
The heating function is only active when the boiler selector (2, fig. 1) is on WINTER .
The water temperature can be set on regulator 4 (fig. 1).
The temperature range is 35-78°C (from the fully anticlockwise to the fully clockwise position).
During temperature setting, the CH symbol on the LCD flashes and the CH setting is displayed.
When the CH system demands heat, the LCD shows the (fixed) CH symbol and the instant temperature of the
CH water.
The burner symbol only shows while the burner is operating.
In order to avoid frequent switching on and off of the heating function, the boiler has a 4-minute waiting time between subsequent
ignitions. If, however, the temperature in the system drops below 40°C, this waiting time is cancelled and the boiler reignites.
1.4.3. DHW function
The domestic hot water function is active with the boiler selector 2 (fig. 1) on SUMMER
or WINTER .
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 storage 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 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 produced by instantaneous boilers with an identical thermal output and traditional ones
with a storage tank of the same capacity.
