Re: Upgraditis: 2-group Grimac Commercial
JavaB, the needle still oscilates, but only within probably 0.1 of a bar.
That 9 bar I mentioned was without a loaded basket.... There seems to be a marked variation in pressure between no load and loaded -- up to 4 bars.
When I went to brew, it was more like 12 bars, so I backed off.... then too much. I actually brewed a fairly acceptable shot at 5 bars! Still tweaking, and as Im running out of beans (as always) I have to be sparing.
I dismantled the three-way valve last night. It had started leaking during extractions and I suspected it may have had some dirt, but all I found was an exceptionally clean valve body! No coffee oils, no grit. May have been a weak spring, or the coil was holding the plunger open a little.
Ill know tomorrow.
That preinfusion system is interesting.... the pressure goes to about 12 bars, then the solenoid valve opens, pressure falls away and water is spent into the drip tray.
The pump starts up again, at about 5 bars, and slowy ramps up to the desired pressure.
Seems to work.
--Robusto
JavaB, the needle still oscilates, but only within probably 0.1 of a bar.
That 9 bar I mentioned was without a loaded basket.... There seems to be a marked variation in pressure between no load and loaded -- up to 4 bars.
When I went to brew, it was more like 12 bars, so I backed off.... then too much. I actually brewed a fairly acceptable shot at 5 bars! Still tweaking, and as Im running out of beans (as always) I have to be sparing.
I dismantled the three-way valve last night. It had started leaking during extractions and I suspected it may have had some dirt, but all I found was an exceptionally clean valve body! No coffee oils, no grit. May have been a weak spring, or the coil was holding the plunger open a little.
Ill know tomorrow.
That preinfusion system is interesting.... the pressure goes to about 12 bars, then the solenoid valve opens, pressure falls away and water is spent into the drip tray.
The pump starts up again, at about 5 bars, and slowy ramps up to the desired pressure.
Seems to work.
--Robusto


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