Gas Valve Calibration; Gas Conversion - Baxi LUNA DUO-TEC MP 1.90 Manual De Uso

15. GAS VALVE CALIBRATION

To calibrate the gas valve, enable the calibration function as described in section 12.2 and
carry out the following operations:
1) Calibrating MAXIMUM heat output.
Check that the measured on the flue duct, with the boiler operating at maximum heat
capacity, matches that indicated in table 2. If it does not, turn the adjustment screw (V) on
the gas valve. Turn the screw clockwise to decrease the level of
increase it.
2) Calibrating REDUCED heat output
Check that the measured on the flue duct, with the boiler operating at minimum heat
capacity, matches that indicated in table 2. If it does not, remove the threaded brass cap on
the gas valve and turn the adjustment screw (K). Turn the screw clockwise to increase the
level of and anticlockwise to decrease it.
V Gas flow adjustment screw
K
OFFSET adjustment screw

15.1 GAS CONVERSION

When converting from natural gas to propane (LPG), before calibrating
the gas valve as described above, replace the venturi assembly ( B) as
indicated in the figure. To achieve this, dismount the gas pipe (thre-
aded nut G1") and remove the three screws securing the flange. Afterwards,
make sure there are no gas leaks. Modify the parameters (fan rpm) as indicated
in table 2 following the procedure described in section 14.
TABLE 2
PARAMETERS - rpm
P46 (a) P28 - P47 (a)
Min. power Max. power
G20 G31 G20
1.90
1250 1250 6500 6050
1.110 1300 1300 6900 6700
*
CO with cover closed. Without cover (chamber open) the value is less than 0.2%.
2
(a) value read on the boiler front panel display to multiply x 10 (e.g.: 125 corresponds to 1250 rpm)
To simplify calibration of the gas valve, set the "calibration function" directly on the boiler control panel as described in
section 12.2.
For cascade ducts, change the parameter P46(a) increasing the number of fan revolutions by 200 (see table 1B in chapter
10.3).
7104645.02 (1-01/12)
Pi Gas supply pressure tap
P45 (a)
Ignition power
G31 G20 G31
2400 2400
2500 3000
and anti-clockwise to
VENTURI GAS NOZZLES
Ø (mm) Ø (mm)
G20-G31 G20 G31
34 5.6 (n°2) 4.5 (n°2)
38 6.4 (n°2) 5.0 (n°2) *9,0
34
CO Min CO Max Max. CO
2 2
(%) (%) (ppm)
G20 G31 G20 G31 G20/G31
*8,5 *9,6 *9,0 *10
< 250
*9,5 *9,2 *10