Delta Mayor D 1 Gr - Operational Adjustments

!
52
5.5 IDEAL GROUP WORKING VALUES
! !
Pump Pressure: 9 bar
Pressure may be confirmed in the manometer’s upper scale;
Pressure may be adjusted by turning the pump’s by-pass screw (turning it
clockwise
will increase pressure).
Boiler Pressure: 1 bar (admissible between 0,9 and 1,2 bar)
Pressure may be confirmed in the manometer’s lower scale;
Pressure may be adjusted by turning the pressure switch screw (turning it
clockwise will decrease pressure).
Safety valve opening pressure: 1,5 bar
Expansion valve opening pressure: 11 bar (approximately)
Espresso coffee extraction temperature: 85/92°
Picture 5.5
Temperature varies depending on the type of coffee mixture used.
Temperature may be measured by using a precision thermometer during extraction.
It is possible to decrease temperature by tuning the pressure switch.
5.6 Adjusting the dose
!
The quantity of extracted coffee is controlled by flowmeters.
The control keyboard buttons can be used to adjust the dosages of the different kinds of coffee.
To begin the programming:
- Fill the filter-holder with one or two doses of coffee for programming one or two cups;
- Put the filter holder in the left group (the settings of the left group are transfered to all other
groups automatically)
- During 3 seconds press button 5.
- When the programming mode begins, button 5 will start blinking.
- In less than 3 seconds, press the button matching the dose we want to program. The extraction
will begin. Press the same button as soon as extraction as reached the desired dose.
- Repeat this process to program all the other buttons.
- If button 5 Led stop blinking, it means that machine get out of the adjusting mode, being
necessary repeat all the procedure to adjust missing doses.