Gas Regulation; Starting Up; Pressure Switch Regulation - La Pavoni CREMONA Mode D'emploi

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5.4 – GAS REGULATION
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 Machine 2 GR
1a 2H3+
G20
B
(methane)
G30
03
(liquefied gas)
G110
1
(town gas)
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.
Machine 3 GR Machine 4 GR
C D
04 05
2 3
28
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, act on the switches
(2-3) 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).
Press the switch (1) 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,
to work at normal power act on switch (2); to work at maximum
power act on both switches (2-3).
Then wait for the machine to reach the 1.1 ÷ 1.3 bar operating
pressure, by checking the boiler pressure on the manometer (7).
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 switch (1), you will need to switch on the gas, by
operating the gas valve (5) and pressing the piezoelectric igniter
(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 pressed the switch (1), 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, to work at
normal power act on switch (2); to work at maximum power act
on both switches (2-3).
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 (7) displays a pressu-
re of approximately 0.5 bar, slowly open the steam tap (14-20),
by turning it anticlockwise, to discharge the air contained in the
boiler, and wait for the steam supply nozzle (11) to start producing
steam, before you close it again. Wait for the machine to reach
the operating pressure and the correct thermal balance, within
35-45 minutes.
important! Do not press the hot water supply switch
or turn the tap before reaching the correct 1.1 bar
operating pressure, indicated by the boiler pressure
control manometer (12).
6.1 – PRESSURE SWITCH REGULATION
The pressure switch shown in the picture is designed to maintain
the boiler pressure constant, by connecting or disconnecting the
electric heating element.
This pressure switch is adjusted during the final testing of the machi-
ne on a 1.1÷1.3 bar value; however, should the specific case
require a different operating pressure, the pressure switch ope-
rating range can be changed by operating the regulation screw
(U): by reducing the pressure, you obtain a temperature reduction,