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Faema Carisma S1 pressure guage.

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  • #16
    The OPV should be immediately after the pump, there's no need for any more than 10bar beyond that point, it'll only stress your machine. You only need 9bar at the puck.

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    • #17
      Originally posted by Horrie39 View Post
      Hi, Mal,
      The 16 (on my machine around 14) bar pressure only happens with the blanking filter in place for flushing. Nevertheless that 16 (or so) bar is throughout the circuit from the pump to the pump pressure gauge. Puts a heavy load on the gaskets. Normal coffee production is around 10 bar on the gauge as you suggest.
      Your gauge should read the same with a blind filter as when you are extracting coffee, not different readings. If you are getting a high reading with a blind filter, that means the OPV is set incorrectly and the pump is probably deadheading. By getting a lower reading when extracting, this means you are likely grinding coarse or underdosing which is limiting the system from reaching maximum pressure.

      The OPV on the Carisma is of poor design in my opinion. I had one in the other day and it was reading real high on the gauge with the blind filter, this was attributed to never being set up properly when it was sold (common practice with dodgy sellers, never bench testing machines).

      To adjust the OPV was a really .....fun.... experience. Once you spot it behind some plumbing up against the front panel of the machine, you think it's an easy job of just turning the big nut that the hose comes out of to change the pressure, much like pretty much every other machine on the market. Nope, this just loosens the nut causing a leak, the real adjustment is a very small flat head screw inside the OPV. Thanks to Faema not adding an access panel underneath (which would have been very easy to do) or just orienting the OPV in a more manageable location, you will need to remove the entire OPV in order to get a screwdriver into it to make the adjustment. Removing the full assembly which incorporates a tee fitting and the boiler fill solenoid is the easiest solution I found. I turned the screw out about 1.5 turns I think which gave 9.5-10 bar measured at the group with a portafilter gauge. Real extraction pressure will be slightly lower.

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