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Group head pressure
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Chuck63
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Joined: 4 Feb 2014
Posts: 18
Location: Connecticut, USA
Expertise: Just starting

Espresso: Bunn es-1A & Bunn ES-1A-F
Grinder: Bunn es-1g
Posted Sun Mar 23, 2014, 9:53am
Subject: Group head pressure
 

I have a Bunn ES-1A that is getting a little long in the tooth.  I built a pressure gauge to measure the pressure at the group head. I am only getting between 45 & 50 lbs.  I turned the adjustment screw all the way clockwise on the pump with no apparent increase.   Is this the correct way to try to increase the pressure and shouldn't it be about 120 lbs?
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CraigA
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CraigA
Joined: 19 Dec 2001
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Location: Rexdale, Toronto, Ontario, Canada.
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Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
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Posted Sun Mar 23, 2014, 10:25am
Subject: Re: Group head pressure
 

Moved post from Espresso: Espresso Blends to Espresso: Espresso Machines.

 
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SStones
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Posted Mon Mar 24, 2014, 4:42am
Subject: Re: Group head pressure
 

Adjusting that screw will adjust the pressure at which the pump relieves the outlet back to inlet. Just adjusting a relief can't create pressure, pressure is created when there's resistance to flow.
So the question is where is the water going?  Is it relieving over the relief you've adjusted, over an OPV somewhere or coming out of the brew circuit somewhere, over boiler-fill or out through the group?
Does the pump sound strained when it's moving water at 45-50PSI? I assume that you mean PSI.
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