Brasilia OPUS Technical Manual page 32

4.D.1. EQUIPOTENTIAL CONNECTION:
An omnipolar switch with a contacts opening distance of 3 mm. or more and a protection device against the elec-
tric leakage with value 30mA are needed for the machine to be properly connected.
SOME REGULATIONS require this kind of connection, which avoids level dif-
ferences of electrical potential between the grounds of the various devices in-
stalled in the same place.
It's composed by a terminal located on the frame, under the drain tray, in order
to be connected with an external equipotential conductor.
At the end of the machine installation it is NECESSARY to perform this con-
nection with a conductor rated for the regulations requirements.
OPERATING SPECIFICATIONS:
• BOILER PRESSURE: around 0,09/0,12 MPa (0,9/1,2 BAR) (see manometer on frontal panel).
The boiler pressure can be regulated acting on the pressure switch (see § "ADJUSTMENTS").
• DELIVERY PRESSURE: around 0,9 MPa (9 BAR) (see manometer on frontal panel).
The delivery pressure can be regulated by using the screw located on the pump bypass (see § "ADJUSTMENTS").
• SAFETY VALVE OPENING PRESSURE: around 0,16/0,17 MPa (1,6/1,7 BAR).
• EXPANSION VALVE OPENING PRESSURE (Valves Group):
1° expansion valve: ± 1,05 MPa (10,5 BAR)
2° expansion valve: ± 1,1 MPa (11 BAR) (coffee circuit)
The opening pressure can be checked via the apposite filter holder (blind) with the manometer and delivering only water: when the ma-
nometer needle stops, the valve will start to drip.
• COFFEE DELIVERY TEMPERATURE: 82/97°C
The temperature depends on the type of blend used; it can be checked with a precision thermometer during delivery. The pressure
switch's screw can be used for minor adjustments (see § "ADJUSTMENTS").
ater mains tap is open and turn the switch knob (4) to position ON.
1) Check that w
2) If the machine is fitted with water level control, the boiler will be filled automatically (green indicator light near the ma-
nometer turns off when filling completed).
If, however, the machine does not have a water level control, filling with water must be done manually pushing "14"
button, checking the water level in the boiler on the graduated visual level gauge which is provided with "minimum" and
"maximum" references. Add water when the level gauge approaches the "minimum" mark.
3) When the water in the boiler reaches the right level (MAX - see frontal panel), set the main switch knob on the heating
element symbol to switch it on. Check the boiler pressure.
4) Wait until the machine reaches working pressure (red indicator light near the switch turns off); open the steam tap for a
few seconds and then close it again or press the steam button on the control holder band.
5) Perform a coffee delivery and check the delivery pressure.
REV. 2 04/2007
4. OPERATING PROCEDURES
4.A. START UP
ENGLISH - 7