Long rebound time after flush with Isomac Tea.

by **jonny2** on Sun Dec 12, 2010 2:59 pm

Using Erics e61 adapter with thermometer I flushed from idle at 210F down to 185F, and waited to get back up to 197F again, it took 4min 26 sec. Isn't that very slow? My pstat is set to min 0.75 and cut off at 1.0, peaking at around 1.05.

Is this normal for a brand new Isomac Tea to have this long rebound time?

by **sweaner** on Sun Dec 12, 2010 3:10 pm

I am not sure if that is too long or not, but I find the Flush and Go technique easier and faster. With my Vetrano I flush to about 203, lock and fire.

http://users.rcn.com/erics/ · by **erics** on Sun Dec 12, 2010 4:34 pm

Isn't that very slow?

It is a lengthy period BUT, considering your pstat setting, it may be reasonable. A "flush-n-go" procedure is the most popular methodology used with hx machines. It is not mine BUT - to each his own. Try flushing to a higher temp - say 190-191.

Have you downloaded the user's manual and looked at the links contained therein?

by **jonny2** on Mon Dec 13, 2010 4:07 am

Have you downloaded the user's manual and looked at the links contained therein?

Yes. I have read the manual and so many posts in this forum that my head is dizzy of information overload

by **lfranchi** on Tue Dec 14, 2010 3:44 pm

jonny2 wrote:Using Erics e61 adapter with thermometer I flushed from idle at 210F down to 185F, and waited to get back up to 197F again, it took 4min 26 sec. Isn't that very slow? My pstat is set to min 0.75 and cut off at 1.0, peaking at around 1.05.

Is this normal for a brand new Isomac Tea to have this long rebound time?

I have the same sort of rebound time on my Tea. It's not new, it's probably 3-4 years old (bought it used ~1yr ago). I usually flush to 194 instead of the 185 as Eric does, and then pull it after it has rebounded to ~197. However, I haven't ever actually verified with a Scace device to see what sort of temps i'm getting at the grouphead.

When I make 2 shots in a row, I usually pull the 2nd one as soon as I am ready, as it takes a cooling flush of maybe 10 seconds to get it back down to temperature. Any tips that you work out are appreciated

cheers,
leo

by **jonny2** on Wed Dec 15, 2010 10:28 am

When I make 2 shots in a row, I usually pull the 2nd one as soon as I am ready, as it takes a cooling flush of maybe 10 seconds to get it back down to temperature. Any tips that you work out are appreciated

I flush down to somewhere to 192 to 185 depending on how long time I need for the coffee preparation.
For the second shot I also flush down to below 197 and let it rebound to up again to 197 to pull shot nr 2. Its rare that I need to pull more than 2 or 3 shots in a row.

From what I have analyzed from a couple of excel-sheets that Eric sent me from a Isomac Rituale it seems that the water temperature after about 20 - 25 seconds in the shot are around 2F to 3F lower than the temperature shown by the thermometer. From what I have read, the Rituale and Tea are identical on the inside.

I will try to borrow a scace somewhere to verify the water temperatures.

http://users.rcn.com/erics/ · by **erics** on Wed Dec 15, 2010 12:46 pm

I flush down to somewhere to 192 to 185 depending on how long time I need for the coffee preparation.

Now that is just simply, SMART - and is one of the reasons I advocate this particular method for certain machines. I treat puck preparation reverently and it is very likely that no one is as slow as I. When you're making one drink for one person, it's time to s l o w things down.

From what I have analyzed from a couple of excel-sheets that Eric sent me . . .

The graphs are, of course, accurate but keep in mind that I've had several Isomac's in the laboooortory (in the basement) where temps are a little chilly and that might have been a machine that I took apart and dunked/descaled the entire boiler. My record keeping and memory are fading.

I will try to borrow a scace somewhere to verify the water temperatures.

Remember to clean your grouphead and screen thoroughly prior to use and operate the Thermofilter just as you would in YOUR normal practice.

by **lfranchi** on Thu Dec 16, 2010 11:49 am

jonny2 wrote:I flush down to somewhere to 192 to 185 depending on how long time I need for the coffee preparation.
For the second shot I also flush down to below 197 and let it rebound to up again to 197 to pull shot nr 2. Its rare that I need to pull more than 2 or 3 shots in a row.

From what I have analyzed from a couple of excel-sheets that Eric sent me from a Isomac Rituale it seems that the water temperature after about 20 - 25 seconds in the shot are around 2F to 3F lower than the temperature shown by the thermometer. From what I have read, the Rituale and Tea are identical on the inside. .

That sounds like my routine as well, except I go from 192-195 based on how much time I need. It doesn't take long for the SJ to grind the beans into my basket

I'll try your advice to flush to 197 and then wait for it to rebound to 197 as well on the 2nd shot, and see how it tastes.

by **jonny2** on Thu Dec 23, 2010 4:08 am

Found this post in this forum, Isomac Tea Temperature Characterization - Need Help

by **jonny2** on Thu Jan 27, 2011 5:24 pm

As long as I nail the same temperature, say 192F on the way up, wouldn't the temperature curve for the shot be the same regardless the temperature where I flushed to? Like flushing to 180F and wait to 192F or flush to 190F and wait for 192F would produce the same shot water temperature?


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