Pressure Switch Regulation; Pump Pressure Setting; Coffee Preparation - La Pavoni Bar Instrucciones De Functionamiento

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,
whereas by increasing the pressure, the water temperature also
increases. The regulation sense is shown in the picture and also on
the pressure switch itself.
Pressure varies by approximately 0.1 atm for each complete turn
of the screw.
Caution! Disconnect power supply before carrying out
this operation.
3
General selector
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HARD and REVOLUTION machines functions
6.2 – PUMP PRESSURE SETTING
Insert in the brewing unit the filter-holder filled with properly
ground, dosed and pressed coffee. Activate the switch or the unit
control keyboard (17) and read the pressure on the pump mano-
meter (12).
N.B. The correct pressure is 8/9 bar.
If the pressure displayed by the manometer should not prove cor-
rect, operate the pump pressure regulation screw (Z), by turning
it clockwise to increase pump pressure or anticlockwise to reduce
pressure.
Once regulation is complete, check the pump setting by delivering
one or more coffee servings.
Z = Pump pressure regulation screw
Caution! When the machine is new, the filter-holder
may not prove aligned (perpendicular to the machine
U
itself) as shown in the picture; this however does not
affect proper operation of the machine itself.
After a brief period of use the filter-holder will
gradually settle on the correct position
A. Position of the closed filter-holder when the machine is new.
B. Position of the closed filter-holder after the machine has been in
use for a brief period.
7 – COFFEE PREPARATION
In order to obtain an excellent Espresso coffee, it is important to use
a top quality coffee blend, properly roasted and ground; grinding
is correct when the coffee delivery time is of 15-18 seconds for one
serving and of 30-35 seconds for two servings. Grinding must take
place at time of use, in that, once ground, coffee loses its fragrance
within a short time; if grinding is too coarse you will obtain light-
coloured and week coffee, without froth; if grinding its too fine you
will obtain dark coloured and strong coffee, with little froth.
Warm cups contribute to maintaining freshly delivered coffee at
the right temperature; it is therefore advisable to place the cups on
the spacious cup-holder grid before use (19), which will make it
possible to take advantage of the heat emanating from the boiler.
On machines provided with an electric cup-warmer, cups are pre-
heated by pressing the yellow button (1): the button warning light
will switch on to signal that the cup-warmer is on. To switch off the
cup-warmer, pressed the yellow button (1) again.
1
Caution! Do not place cloths, felt covers or the like on
the cup holder.
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Z
A
English
B