Wega Espresso Coffee Machine Service Manual download pdf (Page 18)

espresso coffee machine - instructions for technician

English

12. GAS SYSTEM

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.

Gas adjustment

• Lighting the burner

• loosen the locknut

(1);

• give the screw two turns and place the minimum regulator pin

(2) so as to have maximum opening of the gas minimum passage;

• wait for boiler pressure to reach 1.4 bar (see boiler gauge);

• turn the minimum pin

(2) clockwise until the burner flame is barely visible (pilot flame);

• lower the pressure in the boiler down to 1 bar;

• turn the adjustment screw for the maximum clockwise until the flame is up to maximum;

• tighten the locknut thus locking the screw.

The operation described above places the machine in an operating range of 1.2-1.3 bar. If you want to increase or decrease operating pressure

in the boiler, proceed as above, varying the parameters as follows:

to decrease:

• set the maximum to 1.3 bar and the minimum to 0.9 bar. You will obtain pressure in the boiler of 1.1-1.2 bar.

to increase:

• adjust the maximum to 1.5 bar and the minimum to 1.1 bar. You will obtain a pressure in the boiler of 1.3-1.4 bar (this is the maximum

recommended pressure limit)

WARNING

If you decide to use only the gas heating system, no electrical devices are active, including automatic boiler ﬁ lling.

WARNING

When operating on gas, the machine emits combustion fumes directly into the surroundings where it is being used. The-

refore, gas-powered machines must not be installed in rooms with a volume of less than 12 m

, as described in standards

UNI 7129 and UNI 7131.

In closed rooms, always provide ventilation openings to release any possible gas leaks.

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Wega Espresso Coffee Machine Service Manual Page 18