Pressure Profiling on the Evo
The Evo can control pressure in 3 ways
• A preset preinfusion pressure, from 0.5 to 4 bar. This can be set with the pressurestat at the top of the machine, the top cover (4 Allen bolts) need to be removed to do this. Ideally you should find the preinfusion pressure that works best for you and stick to it. It is unlikely any major benefit will be obtained by changing this on a regular basis with the Spring Lever group.
• Lever retardation
• Lever Advance
For the last 2 methods the pressure gauge built into the group chamber, accurately measures brew pressures during the entire shot. This allows you to hold the lever back (retard), or push the lever forward (advance), to reduce or raise pressure. The force required is surprisingly small, because you are applying this pressure right at the end of the lever arm. With a little bit of practice you can get quite precise pressure control. For example, should you wish to limit the shot to 8 bar maximum, simply apply a light fingertip pressure on the back of the lever after release, watch the gauge and ensure it doesn’t rise above 8 bar. …when you finally see the pressure begin to drop below 8 bar you
