20
5.1.6.1 REPLACING THE MAIN BURNER NOZZLE
(all versions)
•
Unscrew nozzle “C” and replace it with the corresponding
nozzle for the selected gas (Table B, fig.3B) complying
with that given in the following table B.
•
The nozzle diameter is given in hundredths of mm on the
nozzle body.
•
Fully retighten nozzle “C”.
5.1.6.2 REPLACING THE PILOT BURNER NOZZLE
(all versions)
•
Undo screw coupling “H” and replace nozzle “G” with one
suitable for the type of gas (Table B, fig.3A).
•
The nozzle identification number is given on nozzle body.
•
Retighten screw coupling “H”.
5.1.6.3 MINIMUM FLAME SCREW
(all versions)
•
Unscrew minimum flame screw “M” from the cock/valve and
replace it with the one suitable for the type of gas (screw
down fully) (Table B, fig.2A).
5.1.6.4 REPLACING THE ADJUSTMENT SPRING OF
THE PRESSURE REGULATOR
•
Replace the spring of the pressure regulator with one
suitable for the gas pressure type given in table B (see
handbook Appendix) as follows:
-
Remove the seal cap, seal cap gasket, adjusting screw
and the spring.
-
Insert the new spring and replace the adjusting screw.
-
Connect a pressure gauge to the appliance’s test point
pressure (fig. 2A/2B).
-
Ignite the appliance’s burners so to have the maximum
gas consumption.
-
Regulate the adjustment screw until the pressure gauge
shows the working pressure value (section 5.1.4 Gas
pressure regulator).
-
Replace the seal cap and gasket and screw tightly closed.
-
Remove the pressure gauge and close the test point
pressure.
-
Prior to operation, test the gas pressure regulator for leaks.
5.1.4 GAS PRESSURE REGULATOR
If the gas pressure is higher than that specified or is difficult
to regulate (not stable), install a gas pressure regulator
(accessory code 927225) in an easily accessed position
ahead of the appliance.
The pressure regulator should preferably be fitted horizontally,
to ensure the right outlet pressure:
•
“
1
” connection side gas from mains.
•
“
2
” pressure regulator;
•
“
3
” connection side gas towards the appliance;
The arrow on the regulator (
) shows the gas flow
direction.
3
1
2
NOTE!
These models are designed and certified for use with
natural or propane gas. For natural gas, the pressure regulator
on the header is set to 8" w.c. (20mbar).
AUSTRALIA
: the gas pressure regulator supplied with the
appliance must be fitted to the appliance inlet. Adjust the
test point pressure with one burner operating at maximum
setting as follow:
- 1.0 KPa for Natural gas
- 2.65 KPa for Propane gas
5.1.5. CHECKING THE PRIMARY AIR SUPPLY
(all versions)
When the primary air supply is correctly adjusted, the flame
does not “float” with burner cold and there is no flareback
with burner hot.
• Undo screw “A” and position aerator “E” at distance “H”
given on the Table B, retighten screw “A” and seal with
paint (fig. 3B - pag. 5).
5.1.6 CONVERSION TO ANOTHER TYPE OF GAS
Table B “technical data/gas nozzles” gives the type of noz-
zles to be used when replacing those installed by the manu-
facturer (the number is stamped on the nozzle body).
At the end of the procedure, carry out the following check-list:
C he c k
Ok
• b u rn e r n o zzle /s re p la ce m e n t
• co rre ct a d ju stm e n t o f p rim a ry a ir su p p ly to
b u rn e r/s
• p ilo t n o zzle /s re p la ce m e n t
• m in im u m fla m e scre w /s re p la ce m e n t
• co rre ct a d ju stm e n t p ilo t/s if n e ce ssa ry
• co rre ct a d ju stm e n t o f su p p ly p re ssu re
(se e te ch n ica l d a ta /g a s n o zzle s ta b le )
• a p p ly sticke r (su p p lie d )
w ith d a ta o f n e w g a s typ e u se d
