LB.00068.20 Pagina 34
2) Enabling Pre-infusion keys No. 1 and 2 ( For E2-3-4 models ).
This function activates pre-infusion for keys No. 1 and 2.
Proceed as follows:
- cut off the power supply to the machine
- turn the machine on by holding down key No.2 until the led on the keys N°5 ( contin./ progr.) comes on.
- cut off the power supply to the machine
- turn the machine back on, which is now ready to operate.
Please note: to deactivate pre-infusion, repeat the above steps.
3) Calibrating expansion valve of the coffee water exchanger.
To calibrate the working pressure (12 Bars), rotate the rubber sitting holder connection of the expansion valve “3” clockwise to increase
it, and anti-clockwise to decrease it.( see hydraulic diagram )
4) Calibrating the steam boiler pressure switch.
To calibrate the working pressure of the steam boiler (0.9-1.1 Bars), rotate the “PR” pressure switch screw (see hydraulic diagram)
clockwise to increase it, and anti-clockwise to decrease it.
The working pressure of the steam boiler is displayed on pressure gauge “6”, when the machine has a steady temperature.
5) Calibrating the coffee dispensing pressure (pump pressure).
To calibrate the coffee dispensing pressure (8-9 Bars), rotate the “MP” pumping body screw (see hydraulic diagram) clockwise to
increase it, and anti-clockwise to decrease it.
SECURITY - ALARMS
1) Boiler filling alarm. ( For E models ).
Causes: the stage of boiler fillings has exceeded the maximum time of 2 minutes; the level of the probe (SLC) has not been reached.
Result: the machine is OFF, and all the keypad leds flash simultaneously:
- 2 quick flashes then a pause for E2-3-4 models
- medial flashes for E1 model
Solution: carry out the following controls.
1) Level probe (SLC) is dirty, so isolated from the water (the complete filling of the boiler is checked)
2) no water from mains
3) low water pressure
4) faulty motor pump
5) faulty filler solenoid valve
6) incorrect electrical connections (level probe (SLC) cord stopped.
2) Boiler minimum level alarm. ( For E2-3-4 models ).
Cause: the water level in the boiler has dropped lower than the safety level (SLS).
Result : heating is deactivated, the boiler gauge indicates that the boiler pressure is decreasing and all the leds on the push-button
panels flash continuously (quick flashes).
Solution: carry out the following controls.
1) Level probe (SLC) is earthen
2) no water from mains
3) low water pressure
4) faulty motor pump
5) faulty filler solenoid valve
6) incorrect electrical connections (safety probe (SLC) cord stopped.
3) Level and safety probe alarms connected in reverse. ( For E2-3-4 models ).
Cause: the level probe (SLC) is identified first, followed by the safety probe (SLS).
Effect: machine OFF and all the leds on the push-button panels flash (3 quick flashes then a pause).
Solution: make the following checks:
1) Invert the probe connections
4) Turbine alarm. ( For E models ).
Cause: the volume meter is not sending signals to the control unit within a time-out of 5 seconds.
Result: delivery continues up to a time-out of 240 seconds or until the selected key is pressed, and and all the leds on the push-button
panels flash (medial flashes)
Solution: carry out the following controls.
1) No water from mains (coffee is not dispensed)
2) clogged group piston filters (coffee is not dispensed)
3) faulty group solenoid valve (coffee is not dispensed)
4) clogged entrance filters (coffee is not dispensed)
5) blocked or faulty volume meter (coffee dispensed continuously)
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