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Expobar Office users...cooling down the engine
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NJFats
Senior Member
NJFats
Joined: 2 Jan 2005
Posts: 13
Location: New Jersey
Expertise: I love coffee

Espresso: Marcuzzi
Grinder: Rancillo
Posted Fri Jan 21, 2005, 8:51pm
Subject: Expobar Office users...cooling down the engine
 

I have read many posts that the Office machines run hot and I have had the same experience with my Marcuzzi. I have lowered the pstat, but it still seems a bit hot if it has been "idling" for a while. I find running about 6-8 oz. through the portafilter cools it down. Would running the hot water tap do the same thing?...it would be alot easier. Thanks
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mike01
Senior Member


Joined: 21 Jan 2004
Posts: 372
Location: SE Michigan
Expertise: I love coffee

Espresso: Izzo Alex
Grinder: Mazzer SJ, Vario-W
Vac Pot: Yama Stovetop
Drip: Bunn Trifecta
Roaster: Hottop
Posted Fri Jan 21, 2005, 10:06pm
Subject: Re: Expobar Office users...cooling down the engine
 

Running water out of the hot water tap drains water out of the boiler. Running water through the group, on the other hand, brings water from the heat exchanger cooling it.  Therefore, running the hot water tap will not accomplish anything, since the water in the HX will still be overheated.  "Help!  Shots bitter with new Expobar"  "Why I think the Expobars run hot..."  "Fine Tuning Brew Temperature on a Heat Exchanger Machine - A Workable Solution"  "Cheap pressure gauge!"
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jrtATL
Senior Member
jrtATL
Joined: 20 Feb 2004
Posts: 1,035
Location: Austin TX
Expertise: I love coffee

Espresso: Expobar Office Control
Grinder: Mazzer Jolly; Cunill...
Drip: Melitta Clarity
Roaster: Drum on a Weber grill; HG/DB
Posted Fri Jan 21, 2005, 10:54pm
Subject: Re: Expobar Office users...cooling down the engine
 

A cooling flush is mandatory for all E61 machines and clones, our Marcuzzies included.

Here's my experience with my pstat deadband set to approx 0.9 low and 1.0 high.

If I have pulled a shot within 2 minutes, 3 oz of water will suffice.

If I have pulled a shot within 5-8 minutes, 6-8 oz will suffice.

If I have not pulled a shot within the last 8 minutes, I'll usually go for 10 oz or so.

Many folks pull a blank shot until the "water dance" stops.  That's what I do, and the water volumes above represent the approximate volumes at which the "dance" stops on my machine.

As posted above, please keep in mind that brew water does not come from the boiler in the Expobar/Marcuzzi.  Run a couple of searches on "HX" or 'E61" and you'll probably learn much more than you ever wanted to know about how these things work.

Good luck.

Jeremy

 
"I've appeared before every court in the state.  Often as a lawyer." - Lionel Hutz, Esq.
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sjames
Senior Member
sjames
Joined: 19 Dec 2001
Posts: 466
Location: Melbourne, Australia
Expertise: Pro Barista

Espresso: Expobar eb-61 Office Leva
Grinder: Mazzer Mini
Vac Pot: Unibuy Syphon
Drip: Are you talking to me?????
Roaster: Genovese Coffee
Posted Sun Jan 23, 2005, 7:19pm
Subject: Re: Expobar Office users...cooling down the engine
 

jrtATL Said:

A cooling flush is mandatory for all E61 machines and clones, our Marcuzzies included.

Here's my experience with my pstat deadband set to approx 0.9 low and 1.0 high.

If I have pulled a shot within 2 minutes, 3 oz of water will suffice.

If I have pulled a shot within 5-8 minutes, 6-8 oz will suffice.

If I have not pulled a shot within the last 8 minutes, I'll usually go for 10 oz or so.

Many folks pull a blank shot until the "water dance" stops.  That's what I do, and the water volumes above represent the approximate volumes at which the "dance" stops on my machine.

Posted January 21, 2005 link

This is exactly my experience on my 2 week old Expobar Office Leva.

I have my pstat set to 1.0 low and 1.2 high (factory settings).  It takesabout an hour to obtain thermal stability, unless you flush the group regularly, and that would probably reduce warm-up time somewhat.  If you follw the links in mike01's post above, you'll find some great information too.

I was concerned that the water in the reservoir, that was heating up, was affecting brew temperature.  I've insulated the water tank with some cardboard and foil, and the water in the tank is 10C above room temp water.  Brew temperature is ~94C (where it should be), so there's no impact there.  I'll remove the insulation and check the tank temp, then see if the brew temp is affected.

I'd love to do a side by side test with a Giotto or even another e-61 machine like the Wega.  That way I could really see any differences in flushing requirements.

On a positive, my Office Leva will produce 25 seconds of brew water (empty basket) @ ~94C, with 1 minute of recovery, over and over, and over, and over, and over...............  

Cheers,
Simon.

 
Simon James.

Kit:  Expobar EB61 Leva, Mazzer Mini, various tampers (Reg Barbers, Pullmans, and the "Perfect Leveller"), Unibuy TCA-3 Syphon, 2 cup V60, SS Moka Pot.

Blog - http://sdotjames.wordpress.com/
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