La Pavoni 2 GR BAR L Operating Instructions Manual - page 29
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5.4 – GAS REGULATION
5
O
6
P
R
N
Q
5. Gas detection valve.
6. Piezoelectric ignition.
N. Gas regulation.
O. Gas injector.
P. Regulation nut.
Q. Minimum regulation screw.
R. Pressure regulation screw.
Category III
1a 2H3+
G20
(methane)
G30
(liquefied gas)
G110
(town gas)
Machine 2 GR
Machine 3 GR
Machine 4 GR
B
03
1
C
04
2
D
05
3
The machine is designed to be supplied by methane gas (G20),
which means that the gas injector (O) and the gas regulator (N) are
set for methane gas.
For GPL gas (G30 liquefied gas) or town gas operation, the gas injec-
tor (O) needs to be replaced with the corresponding one attached to
the machine (see gas injector table).
Gas burner ignition must be carried out by holding the gas detection
valve button pressed (5), to allow inflow of gas into the burner, and
by then operating the piezoelectric ignition button (6).
N.B. The detection valve button must remain pressed for a few
seconds in order for the thermocouple to start.
Adjust the airflow by means of the specially provided air regulation
nut (P); by turning it clockwise the flow decreases, by turning it anti-
clockwise the flow increases, so as to achieve a blue-coloured flame
(avoid high or too oxidising flames, which may damage the boiler).
Wait for the boiler to reach a 1.1 ÷ 1.3 bar operating pressure and
for the flame to be reduced to a minimum.
Should you need to set the gas regulator (N), proceed as follows: turn
the minimum regulation screw (Q) clockwise to lower the flame and
turn it anticlockwise to increase the flame.
When water temperature drops below the minimum set values with
the machine running, the flame automatically switches back to the
maximum value.
To increase or decrease maximum boiler pressure, operate the pres-
sure regulation screw (R) clockwise to decrease the pressure and
anticlockwise to increase it.
The machine is provided with a gas supply tap complying with the
safety standards that, in the event of accidental flame extinction,
resulting from whatever reason, produces the automatic interruption
of gas outflow. In this case, you need to repeat the ignition operation
as described above.
The machine may provide both for electrical and gas heating, or else
it can be independently heated either electrically or by gas.
When the machine is exclusively gas operated, you need to turn the
main switch (3) on the
position, which supplies all the electrical
parts of the machine, with the exception of the heating element.
For the HARD and REVOLUTION models, act on the switches
to stop the heating element.
6 – STARTING UP
Once the hydraulic, electrical and gas connections have been
completed, the machine can be started up.
Open the water system tap (A).
Close the protection switch (D).
Place the main switch (3) on the
position: the live machine
warning light will switch on (2).
For the HARD and REVOLUTION models, press the switch (30) the
indicator light will turn on: the machine is working.
The automatic level indicator will start filling the boiler with water
until it automatically reaches an intermediate position between the
MIN and the MAX level of the level indicator (23).
Once the automatic water filling operation has been completed,
place the main switch (3) on the
position for normal power
operation, and on the
position for maximum power opera-
tion, thus supplying voltage to the water-heating element.
For the HARD and REVOLUTION models, once the automatic water
filling operation has been completed, to work at normal power
act on switch “
”; to work at maximum power act on both
switches
.
Then wait for the machine to reach the 1.1 ÷ 1.3 bar operating
pressure, by checking the boiler pressure on the manometer (12).
Should the machine not settle on the indicated values, you will need
to set the pressure switch as explained in section 6.1.
When the machine is provided with a gas heating system, after
operating the main switch (3), you will need to switch on the gas,
by operating the gas valve (5) and pressing the piezoelectric igni-
ter (6) until the gas remains on.
Now check the pressure on the pump manometer (12), by starting
a unit with inserted filter-holder, filled with properly ground, dosed
and pressed coffee, so as to obtain the actual 8/9 bar operating
pressure.
Should you need to reset the pump pressure, you will need to follow
the directions listed under section 6.2.
The machine is now ready for use.
If the machine is not provided with an automatic level indicator,
after having placed the main switch (3) on the
position, for
the HARD and REVOLUTION models, press the switch (30), press
the manual boiler water filling button (9) to fill the boiler with
water, and keep it pressed untill the water level will have reached
an intermediate position between the MIN and the MAX level of
the level indicator (23).
Once the water filling operation has been completed, place the
main switch (3) on the
position for normal power operation
or on the
position for maximum power operation, thus con-
veying voltage to the water heating element.
For the HARD and REVOLUTION models, once the automatic water
filling operation has been completed, to work at normal power
act on switch “
”; to work at maximum power act on both
switches
.
Regularly check the level of the water contained in the boiler, which
must not drop below the MIN level of the level indicator (23);
if necessary, top up to restore the required level by pressing the
boiler water filling button (9).
Caution! Absence of water in the boiler while the
machine is running causes interruption of the resistance,
which will have to be restored by an authorised
Assistance Centre.
During start up:
When the boiler pressure control manometer (12) displays a
pressure of approximately 0.5 bar, slowly open the steam tap
(20), by turning it anticlockwise, to discharge the air contained
in the boiler, and wait for the steam supply nozzle (11) to start
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