47
Gas pipe
Mixer
Gas valve
fig. 22
3.7.3.
Check and adjust the gas valve
PREMISE
The boiler, by means of the "BEST" function, automatically adapts combustion according to the installation conditions, therefore the
following procedure must be carried out following the chimney sweep function if the gas calibration values do not correspond to those on
the rating plate or if the electronic board, the electrode, the fan or the gas valve have been replaced.
The boiler must be ready for operation, purged of air and with the heating function enabled. The procedure can start in two different ways
depending on the value of parameter "P14":
AUTO
(“P14” = 5): the boiler performs 10 ignition attempts at gradually increasing power;
MANU
(“P14” = 0): the boiler makes 5 ignition attempts at the ignition power indicated in parameter “P31”.
Once burner ignition has been successfully obtained, the boiler autonomously carries out a cycle at minimum power "P0", ignition "P1"
and maximum power "P2" to obtain good flame stability, then in CO2 edit mode to allow manual calibration.
The mode type setting (AUTO or MANU) is entered in the activation code for parameter “P14” in the TSP Parameters menu as described
in paragraph “3.2.15. TSP parameters that can be set from the interface and from the Remote Command” on page 48.
The AUTO mode is the recommended one and which allows the greatest freedom to modify the
CO
2
OPERATIONS TO BE CARRIED OUT
Enter the chimney sweep function (see paragraph 3.2.7) and check that the CO2 value falls within the limits of Table 26 both at maximum
(Hi) and at minimum (Lo) power (if the system temperature should rise excessively, it is possible open the DHW taps to dissipate the heat;
it is not possible to start the procedure with the DHW open).
If not, proceed as described below.
Press the “ ” and “ ” keys (A + B fig. 1) simultaneously for the cycle time. Release then immediately press (within 2 seconds) the
button " " (C fig. 1).
The board confirms the activation of the function and shows "
Au-to
" or "
Ma-nu
" on the display according to the defined setting mode.
The board will internally generate a request to operate in "calibration" mode and start the power up sequence. If the "Au-to" function is
active, the "radiator" symbol will also flash.
Once ignition has been completed, the boiler will carry out a parameter memorization cycle at maximum power, then at ignition power and
finally at minimum power. During this phase, the LCD display cyclically shows the cycle time and the delivery temperature.
At this point the probe of the fume analyzer can be inserted into the exhaust duct.
AUTO ADJUST
The message “P0” appears on the display and the board is ready to adjust the O2 value at minimum power.
With this condition:
