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coffeedogz
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Joined: 2 Jun 2004
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Location: rocky mtn
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Posted Wed Jun 9, 2004, 6:57am
Subject: Plumbing Rancilio S27
 

I was wondering if anyone has plumbed a Rancilio S26 or 27 (or any other direct water connected machine) as a portable machine? Any help or ideas would be greatly appreciated.
Sean
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HB
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Joined: 3 Apr 2003
Posts: 2,913
Location: Cary, NC
Posted Fri Jun 11, 2004, 8:07pm
Subject: Re: Plumbing Rancilio S27
 

How about a Flojet system and bottled water?  I used one at the SCAA conference to run three machines for the consumer espresso lab and it worked great.  If you really want to see it done right, check out the thread "Wife says espresso machine out of kitchen or else!"

-- Dan

HB: Flojet.jpg
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TedJ
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Posted Fri Jun 11, 2004, 9:36pm
Subject: Re: Plumbing Rancilio S27
 

Dan. you amaze me. :-)
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mikeW
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Posted Sun Jun 13, 2004, 8:32am
Subject: Re: Plumbing Rancilio S27
 

Or try the cheap option.
non-return valve on end of hose in water bottle.

MikeW
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HB
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Joined: 3 Apr 2003
Posts: 2,913
Location: Cary, NC
Posted Mon Jun 14, 2004, 5:56pm
Subject: Re: Plumbing Rancilio S27
 

mikeW Said:

Or try the cheap option.  non-return valve on end of hose in water bottle.

Posted June 13, 2004 link

Someone mentioned that option while discussing the setup of the consumer espresso lab at the SCAA conference.  I'm a teenie bit concerned that priming the line / running dry might damage the pump, even if it ran only for a few moments.  Admittedly, I tend to be overcautious and doubly-so when it involves expensive equipment that doesn't belong to me.  Being curious, I asked a friendly lurker who installs and repairs commercial equipment for a more complete answer:

Not all machines activate the pump when filling. Those that do work very well with this simple system as the Procon pump is designed to do just that, pump.  Machines that simply fill by water pressure will need the help of a bottle pump or standard Shurflo. This is another way of suppling the machine that makes perfect sense. The incoming pressure should be 22 PSI max and most line water pressure is significantly higher, so the pump could theoretically allow the solenoids to operate at a calmer pressure. The most important factor I've found in the success of this procedure is the addition of rubber o-rings at each water connection joint. If the machine gets air bound it could be a pain but I get very few calls because of it. If it runs out of water the exchanger will not flow but it will take quite a long time before all of the water will evaporate from the boiler. Hopefully the machine has a high limit thermostat though some do not. Again, this is a great way to make commercial machines portable for catering parties, nice and quiet and large enough to mean business.

A check valve is little more than a fitting with a ball inside that prevents water from flowing back.  Despite the reassurances above, the idea of running a rotary dry doesn't appeal to me (the sound surely wasn't nice when I did by mistake), so if it were my machine, I'd supply positive pressure.  If that wasn't possible, priming the line under pressure should be enough precaution, even for paranoids like me.  :-)

Also see "Question about rotary pump on pour-over Astra." for a related discussion.

-- Dan

HB: check-valve.jpg

 
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strugs
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Joined: 21 Jul 2003
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Posted Mon Jun 14, 2004, 8:55pm
Subject: Re: Plumbing Rancilio S27
 

Dan,
Your lurker friend suggests max 22 psi for a flo-jet system.  Do you know if this is true for plumbed in vibe pumps too?  I have mine set at 30, as I thought I saw that setting recommended here somewhere, but I want to be on the safe side....

 
- Sean
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HB
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Joined: 3 Apr 2003
Posts: 2,913
Location: Cary, NC
Posted Mon Jun 14, 2004, 9:58pm
Subject: Re: Plumbing Rancilio S27
 

strugs Said:

Do you know if this is true for plumbed in vibe pumps too?  I have mine set at 30, as I thought I saw that setting recommended here somewhere, but I want to be on the safe side....

Posted June 14, 2004 link

Yes, same answer.  Being Mr. Cautious, I have mine set at 14 PSI.  OTOH, some routinely ignore this advice and run directly off line pressure.  Some machines won't complain, others will drip from the grouphead solenoid.  I can't think of an advantage of running it higher than the minimum, especially for vibe pumps, which are (technically) spec'd at zero positive pressure.

-- Dan

 
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