GGMgastro 31876500, Instruction Manual

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79
EN
doors or by removing the control panel.
Remove the nozzles and replace them with suitable
ones according to the BURNERS table. Be careful to
keep and assemble the seal gasket, if any.
Regulation of PEL 21 minimum (Fig. 3)
Referring to the "BURNERS" table, adjust the
minimum gas flow adjustment screw (B) as follows:
- for LPG operations, tighten the minimum gas
flow adjustment screw up to the stop;
- for operations with natural gas:
1 Find the knob of the corresponding valve.
2 Ignite the burner and bring it to the minimum
position.
3 Adjust the minimum flow rate by turning
the gas flow adjustment screw (B) (Fig. 3):
by unscrewing, the flow rate increases; by
screwing, the flow rate decreases.
4 Once the flame that is considered suitable
for the minimum function has been reached,
check that it corresponds to the minimum
flow rate indicated in the "TECHNICAL DATA"
table; the check must be made according to
the "volumetric method" already described
above, which is:
5 Read the gas meter and, at the same time,
restart the chronometer.
6 After a few minutes, i.e. 10 minutes, stop the
chronometer and read the counter.
7 Calculate the amount of gas which has
passed in 10 minutes (i.e. it’s the difference
between the two readings), for example 2nd
reading - 1st reading = 30 liters (0.03m³).
8 Now calculate the power at the minimum
position, applying the formula of the
volumetric method (see the previous
paragraph). Power (kW) = consumption
(m³/h) x the heating power of methane.
9 If the power is lower than the value given in
the table, unscrew the minimum screw again
and repeat the check.
10 If the power is higher than the value given
in the table, tighten the minimum gas flow
adjustment screw again and repeat the
check. (9.45 kW / h). P (kW) = 30 liters X 60/10
X 9.45 kW / h = 1,700 kW.
Regulation of the pilot light (Fig. 4)
- The pilot light operates with nozzles and fixed
air. The only requested operation is to replace
the nozzles according to the gas type as follows:
- Loosen the nut, pressing the biconical coupling (N.
14); remove it (N. 15) and the pilot nozzle (N. 16).
- Replace the pilot nozzle with the correct nozzle;
refer to the “BURNERS” table.
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
(Fig. 2)
The regulation is made using the Venturi tube by
adjusting the “X” dimension given in the “BURNERS”
table and checking the appearance of the flame
which must be homogeneous, well ventilated and
not noisy.
Checking the functions
- Start the appliance;
- Check the gas pipes for leaks;
- Check the burner flame, even at the minimum
position.
Notes for the installer
- Explain and show 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 alterations or modifications to the
room that houses the appliance, the appliance
functions must be rechecked.
CHECKING FOR GAS LEAKAGE
After the installation, make sure that there are no
gas leakages. Use some water with soap and brush
it on the joints and fittings; any small leakage will
be shown by means of soap bubbles.
Another way to check for a gas leakage is to make
sure that the meter, if any, over a period of about 10
minutes, does not signal any gas passage.
WARNING: never use an open flame to check for
gas leakages.
RUNNING THE APPLIANCE
ON OTHER TYPES OF GAS
The appliance is tested and set up for operations
with the type of gas given on the technical data
plate. If the gas for which the appliance is regulated
is different from that of the connection, it is
necessary to fit the appliance by carefully following
the instructions below:
Replacement of the burner nozzles
The nozzles are accessible by opening the cabinet