44
INSTALLER
USER
MAINTENANCE TECHNICIAN
TECHNICAL DATA
3.11 "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 Reset button (1) for 8
seconds in absence of DHW requests, its activation is signalled
by the indication of the ow temperature and the ashing
and symbols.
is function allows the technician to check the combustion
parameters. Once the function is activated, it is possible to select
whether to perform the check in CH status, regulating the param-
eters with buttons (5 and 6) or in DHW mode opening any DHW
cock and always regulate the parameters with the buttons (5 and 6).
Functioning in CH or DHW mode is visualised by the relative
ashing or symbols.
On completion of the checks, deactivate the function by pressing
the Reset button (1) for 8 seconds.
3.12 Pump anti-block function.
e boiler has a function that starts the pump once every 24 hours
for the duration of 30seconds in order to reduce the risk of the
pump becoming blocked due to prolonged inactivity.
3.13 ree-way anti-block system
e boiler is supplied with a function that activates the motorised
three-way unit at least every 24 hours, carrying out a complete
cycle in order to reduce the risk of three-way block due to pro-
longed inactivity.
3.14 RADIATORS ANTI-FREEZE FUNCTION.
If the system return water is below 4°C, the boiler starts up until
reaching 42°C.
3.15 P.C.B. periodical self-check.
During functioning in central heating mode or with boiler in
standby, the function activates every 18 hours aer the last boiler
check/power supply. In case of functioning in domestic hot water
mode the self-check starts within 10 minutes aer the end of the
withdrawing in progress, for duration of approx. 10 seconds.
During self-check, the boiler remains o, including
signalling.
3.9 POSSIBLE ADJUSTMENTS.
N.B.: to adjust the gas valve, remove the plastic cap (6); aer
adjusting, ret the cap.
• Preliminary calibration operations.
- Set parameter P4 at 0%.
- Set parameter P5 at 99%.
• Activate the chimney sweep function.
- Enter the “DHW chimney sweep” mode, opening a DHW cock.
• Adjustment of boiler nominal thermal heat output.
- Set the maximum output (99%) using the buttons (5 and 6 Fig.
33).
- Adjust the boiler nominal power on the brass nut (3 Fig. 37),
keeping to the maximum pressure values stated in the tables
(Par. 4.1) according to the type of gas; by turning clockwise the
heat potential increases, anti-clockwise it decreases.
• Adjustment of boiler minimum thermal heat output.
N.B.: only proceed aer having calibrated the nominal pressure.
- Set the minimum output (0%) always using the buttons (5 and
6 Fig. 33).
- Adjust the minimum thermal input by operating on the cross
plastic screws (2) on the gas valve maintaining the brass nut
blocked (3);
• Exit the “Chimney sweep” mode and keep the boiler functioning.
• Adjustment of the boiler minimum heat output in heating phase.
N.B.: only proceed aer having calibrated the minimum boiler
pressure.
- To adjust the minimum heat output during the heating phase,
change parameter (P4), increasing the value the pressure in-
creases, reducing it the pressure drops.
- e pressure to which the boiler minimum heat output must
be adjusted, must not be lower than that stated in the tables
(Par.4.1).
• Adjustment (any) of the boiler maximum heat output in heating
phase.
- To adjust the maximum heat output during the heating phase,
change parameter (5), increasing the value the pressure increas-
es, reducing it the pressure drops.
- e pressure to which the boiler maximum heat output must
be adjusted in central heating phase, must not be carried out
in reference to that stated in the tables (Par. 4.1)
3.10 AUTOMATIC SLOW IGNITION FUNCTION WITH
TIMED RAMP DELIVERY.
In ignition phase, the P.C.B. supplies constant gas with pressure
proportional to the parameter “G2” set.
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