I am trying to decide between two La Marzocco models

 

2-Group Linea Semi-Auto

2-Group GB5 Semi-Auto

 

Which is better for a new store? Thoughts?

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You need access to the Factory or Technician level of programming, not just the Barista Level.

1. Press and Hold the "PROGRAMMING" button , (the spiral), on Group 1 keypad till the password screen appears.
2. Enter the Technician Level Password
3. Press the "MODE" button till Pre-brewing screen appears (about three times?).
4. If Pre-brewing is not "ENABLED", use the "+" or "-" button to change it to "ENABLED" and "ENTER"
5. When enabled, the screen shows "T(tot)" and "T(on)". T(tot) is the total time for pre-infusion during which the pump stays on for T(on) and is off for the rest of the T(tot). Be sure T(tot) > T(on). "ENTER"
6. Repeat the procedure for all groups
7. When finished, press "MODE" to program other parameters or press "ON/OFF" to exit programming.

Note: T(Tot) and T(on) are in 0.1 seconds. Hence value 10 equals 1 second. Also, setting "T(tot) = 0" and "T(on) = 0" disables pre-brewing for that group.

Hope this helps.
mine's a semi-auto(EE), there's no spiral. do the semis have pre-infusion?
I am not familiar with the semi- auto. Never owned one. May be someone from La Marzocco USA would chime in.
there's nothing in the manual about it. maybe it has to have volumetrics to do pre-infusion? seems weird though, some paddle groups obviously have it.
EE's don't have preinfusion, the way they do it in the AV models is to cycle the pump followed by a pause. You can accomplish the same results manually but it would be nice for repeatability for it to be programmable.

Jared Rutledge said:
there's nothing in the manual about it. maybe it has to have volumetrics to do pre-infusion? seems weird though, some paddle groups obviously have it.
well also by using line pressure, i don't want to preinfuse with 9bar
Linea and the GS3 definitely use pump pressure when preinfusing. Not positive about the GB5, I would think that you don't get 9bar in the few tents of a second that the pump is activated but I could be completely wrong.
Rao calls it fake preinfusion. I'd wait for Strada.

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