Pre-Infusion And Sti; Sti; Tamping Level; Grinder Calibration - Electrolux Unic Tango Ace Field Service & Pm Manual

► Pre-infusion and STI

♦ STI

This function is common to all "coffee" cycles. It permits adjusting when in the piston cycle the infusion starts,
it is particularly effective for the "1 cup" cycles. The "1 cup" quality is therefore improved and more regular,
therefore programming of all the "coffee" key settings can be done by the PP mode.
Settings for 1 or 2 cups are done separately.
STI = 00 is the factory setting (ideal setting in 95% of cases)
(00 setting includes a small amount of pre-infusion)
STI = +01 to +100: infusion starts later (less pre-infusion)
STI = -01 to -100: infusion starts earlier (more pre-infusion)
STI = > 60 cancels the effect of the STI.

♦ Tamping level

There are four tamping levels.
A number gives the intensity of the tamping force; the higher the number, the more force is applied.
When exiting this setting, the machine automatically carries out self-check phases 1 and 2 to recalculate the
piston parameters generated by the new tamping values.
In general:
A small dose of ground coffee infused by a small quantity of water needs heavy tamping: Level 4
A large dose of ground coffee infused by a larger quantity of water needs light tamping: Level 1.

►Grinder calibration

The type of coffee used and the grinder collar setting will affect the
ground coffee dose. This procedure calibrates the actual ground
coffee weight dispensed to match the value in the programmed
settings. Select the desired grinder, prepare the weighing kit and
the scale, and then follow the procedure.
This procedure is done in 2 steps:
1 – Grinder Tuning (Grinder collar adjustment)
A test cycle displays the time of the extraction in seconds.
Test cycle: 2 cups of 50 cl. using about 14 grams of ground coffee.
The test cycle infusion time is displayed at the end of the cycle.
2 – Grinder dose Calibration
2 grind cycles, one short and one longer, are weighed and recorded. The resulting time needed per gram is
automatically calculated and applied to the programming to produce an accurate weight for each dose.
A master reset returns to the initial calibration preset in the machine's memory, in the case of replacing grinder
burrs, if no scale is available, or incorrect operation, etc.
Level Setting range
1 0,6 to 1,4
2 1,5 to 2,5
3 2,6 to 4,0
4 4,1 to 6,5
Default value
0,8
2,0
3,5
6,0
ace
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