54
54
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
3.19 RADIATORS ANTIFREEZE FUNCTION.
If the system return water is below 4°C, the boiler starts up until
reaching 42°C.
3.20 PERIODICAL P.C.B. SELF
-
CHECK.
During functioning in central heating mode or with boiler in
standby, the function activates every 18 hours after the last boiler
check/power supply. In case of functioning in domestic hot water
mode the self-check starts within 10 minutes after the end of the
withdrawing in progress, for duration of approx. 10 seconds.
N.B.:
during self-check, the boiler remains off.
3.21 AUTOMATIC VENT FUNCTION.
In the case of new central heating systems and in particular mode
for
fl
oor systems, it is very important that deaeration is performed
correctly.
Th
e function consists of the cyclic activation of the
pump (100 s ON, 20 s OFF) and the 3-way valve (120 s D.H.W.,
120 s C.H.).
Th
e function is activated in two different ways:
- at each new boiler power supply, based on the setting of param-
eter “A7”;
- by pressing buttons “
”
and
“
” at the same time for 5
seconds with boiler in stand-by.
N.B.:
if the boiler is connected to the CAR
V2
the “stand-by”
function can only be activated via the remote control panel.
In the first case, the function has duration of 8 minutes and it
can be interrupted by pressing the “
” button (18). In the
second case it has duration of 18 hours and it can be interrupted
by simply switching the boiler on.
Activation of the function is signalled by the countdown shown
on the indicator (Ref. 14 Fig. 33).
3.1
6
"
CHIMNEY SWEEP” FUNCTION.
When activated, this function forces the boiler to variable output
for 15 minutes.
In this state all adjustments are excluded and only the safety
thermostat and the limit thermostat remain active. To activate the
chimney sweep function, press the “
” button until activation
of the function in the absence of DHW requests.
Its activation on the boiler display is confirmed by indicators “
”
and “ ”
fl
ashing at the same time, while on the CAR
V2
(optional)
it is reported as “ERR
>
07”.
Th
is function allows the technician to check the combustion
parameters.
Once the function is activated, it is possible to select whether to
make the chick in CH status or DHW status by opening any hot
water cock and regulating the power by turning the "CH regula-
tion" selector (6).
Th
e central heating or DHW operating mode is displayed by the
relative symbols
or
.
After the checks, deactivate the function switching the boiler off
and then on again.
Attention:
the boiler needs a certain amount of time to stabilise
itself before carrying out a combustion parameters check. It is thus
necessary to wait for the boiler to carry out a self-diagnosis test,
which is signalled by the ( )
fl
ashing symbol. Once the symbol
stops
fl
ashing, it is possible to check the combustion parameters.
3.1
7
PUMP ANTI
-
BLOCK FUNCTION.
Th
e boiler has a function that starts the pump at least once every
24 hours for the duration of 30 seconds in order to reduce the
risk of the pump becoming blocked due to prolonged inactivity.
3.1
8
THREE
-
WAY ANTI
-
BLOCK SYSTEM.
Both in “domestic hot water” and in “domestic hot water-central
heating” phase the boiler is equipped with a function that starts the
three-way motorised group 24 hours after it was last in operation,
running it for a full cycle so as to reduce the risk of the three-way
group becoming blocked due to prolonged inactivity.
