BERTO'S G6F3B Serie Manual De Instrucciones página 62

If you wish to check the rated output further, you may do so
by using a gas meter according to the so-called "volumetric
method".
However, it is normally enough to simply check that the
nozzles are functioning correctly.
Checking input pressure (Fig.1-2)
The input pressure should be measured by using a gauge
(min. resolution 0.1 mbar).
Remove the screw (22) from the pressure socket and connect
the gauge; after measuring, retighten the screw so that it's
absolutely airtight (22).
IMPORTANT: The pressure must be checked with all gas
equipment connected and operating.
Check the power according to the volumetric method
Using a gas counter and a stopwatch, you can measure the
gas consumption in a given unit of time. This value will be
compared with the value E, which is calculated as follows:
Burner power
E =
Gas heating power
It's important that the power is measured when the appliance
is in a state of inertia.
Both rated and reduced powers, calculated at the rated
pressure value, are obtained by referring to the "BURNERS"
table. The value of gas heating power can be requested from
the local gas company.
Checking the operation
Ensure that the type of used nozzles corresponds to
that shown in the "BURNERS" table. Check whether the
pressure reducer has a flow rate greater than the sum of the
consumption flow rate of all connected equipment. Check
that the gas supply pipes are adequate.
Checking the pilot light
When correctly adjusted, the pilot light will completely
surround the thermocouple; if it does not, check to see if the
used injector is suitable for the type of gas.
Checking primary air
The air volume flow is properly regulated when there is
proper protection against the rising of the flame when the
burner is cold or the flame returning when the burner is hot.
The "TECHNICAL DATA" table provides the measurement of
primary air for combustion.
Checking the functions
- Start the appliance;
- Check the gas pipes for leaks;
- Check the burner flame, even at the minimum.
Notes for the installer
- Explain and demonstrate how the appliance works to
the user according to the instructions, and hand him the
user's manual.
- Remind the user that, in the event of any structural
ENGLISH
alterations or modifications to the room that houses the
appliance, the appliance functions must be rechecked.
Running the appliance on other types of gas
To change over to another type of gas, for example from
methane to liquid, use the correct type of nozzles for the
burner in accordance to the "BURNERS" table.
The nozzles of the burners for different types of gas, marked
in 100ths of mm, are in a case supplied with the appliance.
When the appliance has been transformed or adapted,
recheck its functions as described in paragraph "Checking
the functions". Once you change the predisposition, indicate
the new type of gas on the label.
Replacing the nozzle of the main burner (Fig. 4)
To replace the nozzle (30), remove the gravy collection tray
and unloose the fixing screws of the control panel. Remove
the control panel. Use a proper wrench to loosen the nozzle
from its nozzle holder and replace the nozzle with a new
one (see the "BURNERS" table). If necessary, push the air
adjustment coupling back by loosening the screw (39); that
way, the replacement will be easier. After positioning the
new nozzle, restore the distance of the "A" primary air (see
the "BURNERS" table).
Regulation of the pilot light (Fig.5)
The pilot light operates with a nozzle and fixed air. The only
requested operation is to replace the nozzles according to
the gas type as follows:
- Remove the control panel by loosening the fixing screws.
- Loosen the nut pressing the biconical coupling (no. 14);
remove it (no. 15) and the pilot nozzle (no. 16).
- Replace the pilot nozzle with the correct nozzle, consulting
the "BURNERS" table.
- After replacing the pilot nozzle, retighten the nut pressing
the biconical coupling (no. 14) with the relevant biconical
coupling (no. 15).
Regulation of the low flame screw (Fig.2-Fig.3)
Consult the "BURNERS" table and adjust the low flame screw
(20) as follows:
- when using liquid gas, tighten the minimum adjustment
screw all the way down
- when using methane:
Locate the knob of the corresponding tap.
1-
2- Turn the burner on and put it at the minimum output
position.
3- Adjust the minimum flow rate with screw 20 (Fig.
2-3). Unscrew to increase the flow rate and tighten to
decrease it.
4- Once the flame is judged as suitable for a minimum
setting, check that it corresponds to the minimum
flow indicated in the "TECHNICAL DATA" table. The
check must be carried out according to the "volumetric
method", described above, as follows:
5- Read the gas counter and, at the same time, start the
stopwatch.
6- After quite long time, for example 10 minutes, stop the
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