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?
SStones Senior Member Joined: 24 Nov 2012 Posts: 474 Location: Canada Expertise: Professional
Espresso: Giga 5, ECM Giotto, Rocket... Grinder: Anfim Milano-Best Vac Pot: No :( Drip: Some $30 thing from Walmart Roaster: I buy pre-roasted.
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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