Rancilio S20 manual Machines with Alternative GAS Heater Version

11.MACHINES WITH ALTERNATIVE GAS HEATER VERSION

N.B. Installation of the machine and any adjustment or adaptation to the type of gas should be done by a technically qualified

person.

The machine leaves the factory all set for use with liquid gas (GPL).

The gas regulator (1) is therefore fitted with the appropriate injector shown in the table below:

	Nominal	GPL	Natural gas
Model	thermic
		G30 - 29 mbar	G20 - 20 mbar
	capacity
2-3 Gr.	2,5 KW	75	102
	(2150 Kcal/h.)

The primary air intake regulator (2) is set with the reference notch showing “GPL” corresponding to the fixture screw (3).

The flame is regulated (minimum and maximum) to suit this type of gas.

If the machine is to be used with a different type of gas, it will be necessary to replace the injector in accordance with the above table and to rotate the primary air regulator (2), which, in the case of natural gas, will have to be set with the reference notch showing “N” corresponding to the securing screw (3).

To do this, it will of course be necessary to loosen the securing screw (3) and to tighten it again after rotating the primary air intake regulator (2).

Connections to mains gas, from the gas tap available in the room to the valve fitted on the machine, must be carried out in accordance with the regulations in force, using a flexible pipe or a rigid pipe of soft copper.

In the latter case, the special rubber-pipe fitting in connected tightly to the valve by means of the biconical nozzle and securing nut supplied.

The flexible pipe is fitted over the end of the mains outlet and secured with the metal strip supplied. Alternatively, the soft copper pipe can be connected up, again using the special biconical nozzle and the appropriate nuts, directly to the valve.

Once the machine has been connected up to the gas main, and after filling the boiler up with water in accordance with the instructions in the booklet

(“INSTRUCTIONS FOR USE AND MAINTENANCE”), the burner can be lit in the following manner:

●Open the gas exclusion tap.

●Press on the gas valve knob, on the machine rotate it 90° anti-clockwise, and keep it pressed in. At the same time, press the piezoelectric lighter one or more times – the lighter knob bears a symbol resembling a spark – until the burner lights up.

●Wait about 20 seconds, then release the valve knob and the burner should stay lit – the flame is vidible through the special hole in the panel behind the dispenser units.

N.B.

Should the burner not light up, do not persist, but release the valve knob, and then check that lighter spark on the burner is in order and about 5 mm long.

Should the flame go out when the valve knob is released, check the position of thermocouple and the circuit connected to it.

The flame should be bright blue; if not, slightly regulate the primary air intake (2) until the desired effect is achieved.

Wait until the machine reaches the correct pressure, according to instructions. Otherwise, adjust the gas pressure regulator, which has two regulating screws. The one that protrudes more (4) serves to regulate the boiler’s operating pressure, while the other (5) serves to set the flame at the minimum.

When the machine is pressurized, check to see that the minimum flame is correct by adjusting the screw (4) if necessary; after loosening the locking-nut, unscrew the screw until it feels loose (the main gas-pipe is closed), and check whether, under these conditions, the low flame remains lit, thus acting as a pilot.

If the flame is too high, it will be necessary to regulate screw (5), turning it slightly clockwise, of course after having loosened the locking-nut. If, on the contrary, the flame tends to go out, then regulate screw (5) by turning it anti-clockwise, until a very low, but constant flame is obtained. Having achieved this correct adjustment of the minimum flame, hold the screw still and lock it with the locking-nut.

Then rotate the screw (4) clockwise until there is a there is a high flame, and wait for the boiler to reach the desired operating pressure: if the flame dies down before reaching the required pressure, tighten screw (4) further; if the flame dies down at a higher pressure, then unscrew the screw.

Check once or twice by opening the steam tap to release the pressure in the boiler, then hold screw (4) still and lock it with the locking-nut.

1

2

3

5

4

Fig. 16

91