4
Switching on the Domestic Hot water and Central Heating together
Press key
29
the green indicator
33 will light.
Press key
28
the green indicator
32 will light.
If there is no water demand
the display will show the heating flow temperature
If the tank is heating up
the digit will move clockwise on the display
In case of draw off
a square made of 4 digits will move clockwise on the display
Turn off the boiler
- Press keys
29
and
28
, to switch off both D.H.W. and C.H. mode. The green indicators 33 and 32 will stop
- Switch off the main electrical supply
- Shut off the gas service tap
42
Note : In this condition, the anti-freeze system is inoperative
Stand by mode
A fixed digit at the centre of the display and the green indicator
36 on
Putting the boiler in stand by mode and anti-freeze system. :
Press keys
29
and
28
, to switch off both DHW and CH mode. The green indicators 33 and 32 will stop.
During the duration of the stand-by mode, an automatic anti-sticking system will switch on the pump for 1 minute and
make a movement of the 3 way valve every 23 hours.
The stand-by mode will disable the anti-freeze function of the room thermostat (if fitted). To leave the room thermo-
stat anti-freeze system operative, please leave the Central Heating mode on.
The boiler is equipped with an automatic anti-freeze system which is permanently on.
If the Central Heating temperature decreases below 7°C, the pump will start.
If the Central Heating temperature decreases below 4°C, the pump and the burner will start.
Switching on the Domestic Hot Water
Press key
28
, the green indicator
32 will light :
If there is no water demand
the display will show the following graphic
If the tank is heating up
the digit will move clockwise on the display
In case of draw off
a square made of 4 digits will move clockwise on the display
Keys
30
and
31
allow the adjustment of the temperature required for the Domestic Hot Water flow. During the tempera-
ture setting operation the display will flash.
Note : The configuration of the C.H. system can generate some gravity effect when the boiler is set in D.H.W. mode only. It may
result in a temperature rise of the heating pipes close to the boiler (or eventually a radiator). To avoid this, it is possible to close dur-
ing the summer period (Central Heating switched off) the heating flow isolating tap (
40). Don’t forget to open it before switching on
the Central Heating mode again.
