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4970Fwd: [BUG] How to adjust group pressure.

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  • Chuck Hancock
    Apr 1, 2014

       

      Can anyone tell the name & model of a good pump to use on my ES-1A?  The pump motor is fine but the pump is weak.  Thanks,  Chuck Hancock

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      > It dawned on me that some of you have never checked or adjusted the group pressure of your Bunn? What follows applies to ES-1A model.
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      > * UNPLUG MACHINE!
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      > * Remove the top; panel (a few screws).
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      > * Remove the right side panel (1 screw front and back inside edge).
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      > * Use proper size wrench to loosen jam nut on bypass valve)
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      > * Use a long flat-blade screwdriver to turn screw in bypass valve
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      > __Clockwise increases pressure
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      > __Counter clockwise reduces pressure
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      > * Tighten jam nut just past finger tight.
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      > * reassemble side & top panels.
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      > * Plug machine in and enjoy!
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      > These machines are 20+ years old, and because during that time they've probably been bounced around a lot, I've yet to see one with an accurate pressure gauge (either boiler or group). For that reason I never rely on them when adjusting group pressure; instead I use a portafilter-mounted gauge when checking group pressure.
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      > Tex
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