EXTREMA
6
EN
cod. 3540S060 - 04/2010 (Rev. 00)
1.3 Lighting and turning off
Boiler not electrically powered (fig. 5)
B
The frost protection system does not work
when the power and/or gas to the unit are
turned off. To avoid damage caused by
freezing during long idle periods in winter, it
is advisable to drain all water from the boiler,
DHW circuit and system; or drain just the
DHW circuit and add a suitable antifreeze to
the heating system.
fig. 5 - Boiler not electrically powered
Boiler lighting (fig. 6)
Switch on the power to the unit.
•
For the following 120 seconds the display will show
FH which identifies the heating system air venting
cycle.
•
During the first 5 seconds the display will also
show the PCB software version.
•
Open the gas cock ahead of the boiler.
•
When the message FH disappears, the boiler is
ready to operate automatically whenever domestic
hot water is drawn or in case of a room thermostat
demand.
fig. 6 - Boiler lighting
Turning the boiler off (fig. 7)
Press the
on/off
button (detail 9 - fig. 1) for 1 second.
fig. 7 - Turning the boiler off
When the boiler is turned off, the PCB is still powered.
Domestic hot water and heating are disabled. The
frost protection system remains activated.
To relight the boiler, press the
on/off
button (detail 9 -
fig. 1) again for 1 second.
fig. 8 - Relighting the Boiler
The boiler will be immediately ready to operate whenever domestic hot water is drawn or in case of a room thermostat
demand.
