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This function lasts 168 hours (7 days).
To activate the screed heater function:
ƒ set the boiler to OFF (because this function is only available in this
mode
ƒ set 409 = 1, the display will show
---
Once activated, this function takes maximum priority. If there is a power
failure and reset, the function will resume from the point where it was
interrupted.
The screed heater function can be disabled by bringing the boiler to a
condition other than OFF, or by setting 409 = 0.
b
NB: The temperature and increase values can be set to different
values only by qualified personnel, only if strictly necessary. The
manufacturer declines all responsibility if the parameters are in-
correctly set.
In item I001 of the INFO menu, you can see the number of hours that
have elapsed since the function was activated.
4.6
Sliding delivery
(only if water tank connected)
The parameter 507 allows you to activate the SLIDING TANK FLOW
TEMPERATURE function for changing the delivery setpoint used by the
boiler, when in domestic hot water request mode. The factory setting for
this parameter is = 0 (function not active), which provides for a modulation
to a fixed delivery of 80°C, when in domestic hot water request mode.
Setting the parameter 507=1 (function active) the delivery setpoint is no
longer fixed at 80°C, but can be changed and calculated automatically by
the boiler on the basis of the difference between the desired domestic hot
water setpoint and the temperature measured by the water tank probe.
Note: it is not advisable to activate this function for water tanks with a
capacity greater than 100 litres, loading the cylinder would be too slow. It
might be necessary to reset the value of this parameter when replacing
the adjustment board.
4.7
Anti-legionella function
water tank with probe and OT+ connection not present)
The machine has an automatic ANTI-LEGIONELLA function that, daily
or weekly depending on the settings selected, if necessary heats the
domestic hot water at 65°C keeping it at that temperature for 30 minutes,
thereby destroying any proliferation of bacteria in the water tank.
The function is not carried out if the temperature of the water tank rea-
ched 65°C over the last 24h, for daily scheduling, or in the last 7 days, in
the case of weekly scheduling.
The function, if activated, is carried out every day at 03:00am if program-
med on a daily basis, or else every Wednesday at 03:00am if program-
med on a weekly basis. Once activated, the function takes top priority
and cannot be interrupted.
b
The function is not carried out with the boiler set to OFF.
Note: if the OT+ chrono is present and connected (par. 803 = 1) the an-
ti-legionella function is delegated to the OT+ chronothermostat.
The ANTILEGIONELLA function is activated via par. 501 in the following
way:
501 = 0
function deactivated
501 = 1
function active on a weekly basis
501 = 2
function active on a daily basis
The first time the function is performed with a delay of hours from its acti-
vation and subsequently with a daily (24h) or weekly (168h) frequency
depending on the value of par. 501.
In the INFO menu, item I045 indicates the number of days left until the
next anti-legionella function is performed.
During execution, the display shows:
A
b
Once running, the function takes on maximum priority and cannot
be interrupted; however, it can be temporarily suspended by set-
ting the boiler to OFF or by interrupting the power supply. When
restarted, the anti-legionella cycle resumes from where it was in-
terrupted.
If the anti-legionella function is interrupted due to exceeding the maxi-
mum time (4h), the display shows:
A
R c S
(only if connected to a
LE
LE
In this condition, the system retries the execution the next day. The boiler
continues to operate regularly, the "ALE" signal with a flashing bell is
displayed only when the boiler is in stand-by.
4.8
Combustion analysis
b
Checks to verify the adjustments of the CO
to the reference parameters (given in the tables below) must be
carried out with the casing closed. If the casing is opened, the
values will have to be reduced by about 0.2% depending on the
installation configuration (the type and length of the discharge and
suction pipes).
Combustion control sequence
1
.
5 0 8
The probe for the fumes analysis must
be inserted until it reaches the stop
---
+
> 2 sec
The displayed value refers to the number of revolutions divided by 100.
ƒ Set the maximum rpm value
.
7
0 0
The boiler works at the maximum power level.
ƒ Check the analyser to ensure the max CO
indication given in the table. If the value is different, calibrate the gas
valve - see paragraph "4.10 Gas valve calibration".
METHANE GAS
CO
max
2
(G20)
15R
25R
ƒ Set the minimum rpm value
.
1
0 5
The boiler works at the minimum power level.
ƒ Check the analyser to ensure the min CO
indication given in the table. If the value is different, calibrate the gas
valve - see paragraph "4.10 Gas valve calibration".
METHANE GAS
CO
min
2
(G20)
15R
25R
Make sure the flue gas temperature value, read in info I008 (see "5.3
INFO menu
"), is coherent (with a tolerance ± 5°C) with the value
measured by the analyser.
After completing the check:
ƒ quit the function by pressing
28
values in relation
2
4
.
0 0 6
Co
.
0 0 6
MAX
rpm
.
7
0 0
confirm
value complies with the
2
LPG
(G31)
9,0
10,0
9,0
10,0
.
1
0 5
MIN
rpm
confirm
value complies with the
2
LPG
(G31)
9,0
10,0
9,0
10,0
3
2
fan speed
in CH
MAX
or
MIN
%
%
%
%
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