TECHNICAL ASSISTANCE SERVICE
36
If you are going away for a short period of time like a
weekend or a short holiday, etc., turn the function selector
to “
0
” OFF/RESET.
The digital display reads out the message shown alongsi-
de.
Because electrical power and the gas supply to the boiler
both remain on, the boiler is protected by the following
systems:
-
Frost protection:
Central heating
This function is activated if the temperature read by the
central heating flow temperature sensor falls below 6°C.
Under these conditions a heat request is generated,
igniting the burner at minimum power and keeping it on
until the temperature of the central heating flow water
reaches 35°C.
DHW
This function is activated if the temperature read by the
DHW temperature sensor falls below 4°C. Under these
conditions a heat request is generated, igniting the bur-
ner at minimum power and keeping it on until the tem-
perature of the central heating flow water reaches 55°C.
b
The message AF flashes on the display for as long
as the frost protection function remains active.
-
Pump anti-block function:
The pump is switched on
for 30 seconds every 24 hours.
If the boiler is not going to be used for an extended period
of time, proceed as follows to prepare it for shutdown.
- Turn the function selector to OFF/RESET.
- Turn the mains power switch OFF.
- Close the fuel shut-off cock and the central heating and
DHW circuit shut-off cocks.
Note that the frost protection and pump anti-block fun-
ctions are not active under these conditions. Drain the
central heating circuit and domestic hot water circuit if
there is any risk of freezing.
0
bar
4
1
3
2
°C
0
120
20
100
40
80
60
ON
OFF
SHUTDOWN
