Astoria 2GR - Commissioning; Safety Precautions; Preparing the Filter Holders

TECHNICIANS' manual
34 of 108
5.8.4 Gas system connection
To adjust the gas proceed as follows:
1. Turn on the gas system.
2. Remove the locknut (A) and loosen the adjustment screw
(B) by turning it twice.
3. Turn the regulator pin (C) in order to have the maximum
openingfortheowofgas.
4. Wait for the pressure in the heating unit to reach 1.4 bar
(see the heating unit pressure gauge).
5. Turn the regulator pin (C)clockwiseuntiltheburnerame
isbarelyvisible(pilotame)butsufcienttokeepthether-
mocouple active (see the data in the Gas table): check the
minimumpressureviaagaugelocatedonthetting(D).
6. Wait until the heating unit pressure reduces to 1 bar (see
the heating unit pressure gauge).
7. Turn the adjustment screw (B) by screwing it in a clockwise
directionuntiltheameisatitsmaximum.
8. Tighten the locknut (A) to lock the regulator screw in place (B).
9. Wait until the operating pressure in the heating unit -
which is shown on the machine's pressure gauge - reaches
the working value of around 0.11-0.13 MPa (1.1-1.3 bar).
If you would like to increase or decrease the operating pres-
sure in the heating unit, proceed as follows:
TO DECREASE PRESSURE
Set the minimum to 0.09 MPa (0.9 bar) and the maximum
to 0.13 MPa (1.3 bar) and you will obtain a pressure in the
heating unit of approx. 0.10-0.12 MPa (1.0-1.2 bar).
TO INCREASE PRESSURE
Set the minimum to 0.11 MPa (1.1 bar) and the maximum
to 0.15 MPa (1.5 bar) and you will obtain a pressure in the
heating unit of approx. 0.12-0.14 MPa (1.2-1.4 bar) [this
value is the maximum recommended pressure limit].
To check the pressure at the inlet of the injector, connect a
pressure gauge to the connection (D).
The gas system is useful for heating the water
in the heating unit. It does not, except in spe-
cial cases, substitute the electrical heating sys-
tem. Machines with levers can run with electric or gas.
C
D
A
B
6. COMMISSIONING
6.1 Safety precautions
Carefully read the instructions provided in
chapter "I. SAFETY PRECAUTIONS" on page
5.
6.2 Preparing the lterholders
6.2.1 Filter holders
• Placethelter-holdingspring(2)inthehousingofthel-
ter holder (1).
• Take the (3) or (4)one-cuplterandpressitrmlyintothe
lterholder.
6.2.2 Spouts
Finishpreparingthelterholderbyttingthespoutforone
cup (5) or two cups (6).
5
4
1
2
3
6
Properly connect the single lter with the single
spout and the double lter with the double
spout.
6.2.3 Grinding and dosing coffee
It is important to have a grinder-dispenser next to the machine
so that the coffee can be ground on a daily basis.
To adjust the coarseness of the ground coffee, use the appro-
priate regulator located on the grinder-dispenser hopper.
The coffee must be ground and dispensed according to in-
structions provided by the manufacturer of the grinder-dis-
penser. The following points should also be kept in mind:
• To obtain a good espresso it is not recommended that you
store large amounts of coffee beans. Comply with the ex-
piry date indicated by the producer.
• Never grind large volumes of coffee, it is advisable to pre-
pare the amount that can be held in the dosing device and
if possible, use it by the end of the day.
• Do not buy pre-ground cof-
fee, as it perishes quickly.
If necessary, buy coffee
in small vacuum-sealed
packs.