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7.10 ADJUSTMENTS

The boiler has already been adjusted by the manufacturer
during production. If the adjustments need to be made again,
for example after extraordinary maintenance, replacement of
the gas valve, or conversion from methane gas to LPG, ob-
serve the following procedures.
The adjustment of the maximum and minimum output, and of
the maximum and minimum heating and of slow switch-on,
must be made strictly in the sequence indicated, and only by

qualiied personnel only:

- disconnect the boiler from the power supply
- turn the heating water temperature selector to its maximum

- loosen the ixing screws (E) on the instrument panel

- lift then turn the instrument panel towards you

- loosen the ixing screws on the cover (F) to access the ter

minal board

-  insert the jumpers JP1 and JP3
-  power up the boiler
The display shows “ADJ” for approximately 4 seconds
Next change the following parameters:
1 - Domestic hot water/absolute maximum
2 - Minimum
3 - Heating maximum
4 - Soft light fan speed
as follows:
-  turn the heating water temperature selector to set the re-

quired value

- press the CO button and then skip to the calibration of the

next parameter.

Live electrical parts (230 V AC).

The following icons light up on the monitor:

during domestic hot water/absolute maximum cali-

bration

during minimum calibration

during heating maximum calibration

during soft light fan speed calibration

End the procedure by removing jumpers JP1 and JP3 to
store these set values in the memory.
THE function can be ended at any time without storing the
set values in the memory and retaining the original values
as follows:
- remove jumpers JP1 and JP3 before all 4 parameters have

been set

- set the function selector to

(OFF/RESET)

- cut the power supply
- waiting for 15 minutes after it is connected.

Calibration can be carried out without switch on the
boiler.

By turning the heating selection knob, the monitor au-
tomatically shows the number of rotations, expressed
in hundreds (e.g. 25 = 2,500 rpm).

GAS VALVE CALIBRATION

-  Connect the boiler to the power supply
-  Open the gas tap
-  Set the function selector to

(OFF/RESET) (monitor off)

- Remove the screws (E), remove the casing, remove the re-

taining screw below the control fascia then lower the fascia

towards you (ig. 24)

- Loosen the ixing screws on the cover (F) to access the

terminal board

- Press the CO button

Live electrical parts (230 V AC).

- Wait for burner ignition.
The display shows “ACO”. The boiler operates at maximum

heat output.

The “combustion analysis” function remains active for a

limited time (15 min); if a delivery temperature of 90°C is
reached, the burner is switched off. It will be switched back
on when this temperature drops below 78°C.

- Insert the analyser probe in the ports provided in the air

distribution box, after removing the screws from the cover

- Press the “combustion analysis” button a second time to

reach the number of rotations corresponding to the maxi-
mum domestic hot water output (table 1)

- Check the CO2 value: (table 4) if the value does not match

the value given in the table, use the gas valve maximum
adjustment screw

- Press the “combustion analysis” button a third time to reach

the number of rotations corresponding to the minimum out-
put (table 2)

- Check the CO2 value: (table 5) if the value does not match

the value given in the table, use the gas valve minimum
adjustment screw

- To exit the “combustion analysis” function, turn the control

knob

- Remove the lue gas probe and reit the plug

- Close the instrument panel and reit the housing.

The “combustion analysis” function is automatically deactivat-
ed if the board triggers an alarm. In the event of a fault during
the combustion analysis cycle, carry out the reset procedure.

table 1

table 2

table 4

table 5

MAXIMUM NUMBER OF

FAN ROTATIONS

METHANE
GAS (G20)

LIQUID GAS

(G31)

Vision 25C heating - DHW

49 - 61

rpm