espresso coffee machine - technician instructions
16
- english
R
Gas adjustment
To perform the adjustment of the gas proceed as follows:
1) Switch on the gas system;
2) remove the locknut
(A)
and loosen the regulator screw
(B)
by 2 turns;
3) act on the regulator pin
(C)
in order to have the maximum opening for the flow f gas; wait for boiler pressure to reach 1.4 bar (see boiler
pressure gauge);
5) act on the regulator pin
(C)
and turn it clockwise until the burner flame is barely visible (pilot flame) and enough to maintain the ther-
mocouple active; check the minimum pressure through a gauge located on the joint
(D)
;
6) wait for the pressure in the boiler to reduce down to 1 bar (see boiler pressure gauge);
7) act on the adjustment screw
(B)
turning it clockwise until the flame is up to maximum;
8) tighten the locknut
(A)
to lock the screw of the regulator
(B)
.
9) wait for the operating pressure of the boiler indicated on the pressure gauge of the machine, to reach the working value of about 1-1.2 bar.
If you want to increase or decrease operating pressure in the boiler, proceed as above, varying the parameters as follows:
to decrease:
• obtain a pressure in the boiler of about 1.0-1.2 bar, adjusting the minimum to 0.9 bar and maximum to 1.3 bar.
to increase:
• obtain a pressure in the boiler of about 1.2-1.4 bar (this is the maximum recommended pressure limit), adjusting the minimum
to 1.1 bar and maximum to 1.5 bar.
To check the pressure at the inlet of the injector, connect a pressure gauge to the connection
(D)
.
NOTE
The gas system is useful in heating the water in the boiler. It does not, except in special cases, substitute the electrical heating
system, but rather works along with it. For machines with levers, operation may be either electric or gas.
3.6 STARTING THE MACHINE
Before starting the machine, make sure that the level of water in the boiler is higher than the
minimum level on the level-check window
(1)
. If there is no water (first installation or after boiler
maintenance), it is necessary to fill the boiler in advance, so as to prevent overheating of the
heating element. Proceed as follows:
1
A
C
D
B
