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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 (allowed tolerance +/- 0.5%). If it does not, turn
the adjustment screw (V) on the gas valve. Turn the screw clockwise to decrease the level
of
and anti-clockwise to increase it (allowed tolerance +/- 0.2%).
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 (allowed tolerance +/- 0.5%). If it does not, turn the
adjustment screw (K) on the gas valve. Turn the screw clockwise to increase the level of
and anticlockwise to decrease it (allowed tolerance +/- 0.2%).
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, release the gas pipe (fixed with clips for models 1.35 - 1.50 -1.60 and
threaded nut G1" for model 1.70) 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
P30 - P61
**
P60
Min. power
Max. power
Boiler
model
G20
G31
G20
1.35
1500 1500 5000 4800
1.50
1500 1500 6650 6400
1.60
1420 1420 6750 6600
1.70
1270 1270 6450 6100
*
CO
with cover closed. Without cover (chamber open) the value is less than 0.2%.
2
* *
value read on the boiler front panel display to multiply x 10 (e.g.: 150 corresponds to 1500 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 P60 increasing the number of fan revolutions by 200 (see table 1B in chapter 10.3).
Pi
Gas supply pressure tap
LUNA DUO-TEC 1.35-1.50-1.60
PARAMETERS - rpm
**
P59
**
Ignition power
G31
G20
2300
2300
2000
2100
.
LUNA DUO-TEC 1.70
VENTURI
GAS NOZZLES
Ø (mm)
Ø (mm)
G31
G20-G31
G20
3.7
3000
24
(n°2)
3.7
3000
24
(n°2)
4.6
2500
28
(n°2)
5.3
2500
30
(n°2)
39
CO
Min
CO
Max
2
2
(%)
(%)
G31
G20 G31 G20
G31
2.95
*8.5 *9.5 *9.0
*10
(n°2)
2.95
*8.5 *9.5 *9.0
*10
(n°2)
3.45
*9.0 *9.4 *9.0 *10.1
(n°2)
4.0 (n°2) *8.5 *9.5 *9.0
*10
7221369.01 (1-03/15)
Max. CO
(ppm)
G20/G31
< 250
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