Re: Cooling flush
Last one. Youll want a rising temp profile anyway, to counteract the dropping temp from pulling the shot.
If youre using a small boiler machine, youre better off surfing the temp cycle rather than pulling flushes. If youre using a HX machine, flush away.
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Re: Cooling flush
So....if the boiler cycles, do u wait for it to finish, then lock and brew?Originally posted by nunu link=1179472151/0#9 date=1180532638Youre trying to get the brew temp in a particular zone. The boiler recovery wont be that quick.
OR
Wait for the boiler to finish cycling, wait N seconds after, then lock and brew?
Or
Flush, lock and brew, regardless of boiler state?
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Re: Cooling flush
Youre trying to get the brew temp in a particular zone. The boiler recovery wont be that quick.
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Re: Cooling flush
Even if the boiler starts to cycle right after perform the cooling flush?Originally posted by nunu link=1179472151/0#7 date=1180441296Flush until it stops spitting. Pull the shot, enjoy.
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Re: Cooling flush
Flush until it stops spitting. Pull the shot, enjoy.
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Re: Cooling flush
Do you flush till you get the boiler to cycle or just a couple seconds so as to not get the boiler to cycle?
If the boiler does cycle when you do a cooling flush when you should lock pf in and start shot, right away, as soon as the boiler finishes cycling or wait X seconds after boiler cycle has completed?
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Re: Cooling flush
Im certainly impressed by the Makin Espresso machine I had a little tinker with on Saturday at First Pour. Even after quite a long idle time, I went to pull shots and the cooling flush was tiny!
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Re: Cooling flush
What I see is this: steaming and hissing and splattering (ouch) for a second or two,
then some entertaining jiggling around for about 5-7 seconds, then a fairly steady
stream.
I usually wait just until the steady stream starts, then lock and start the shot.
If I want to brew a little hotter I wait until not quite the end of the jiggle.
Does that seem about right?
Machine is Isomac Mondiale.
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Re: Cooling flush
thanks, I think listening to the hissing from the hotter water is what I needed to look for, noticed it straight away.
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Re: Cooling flush
As with all things, its probably best to let taste be your guide. Try out a whole bunch of flushing routines and see what tastes best!
One of the great things about the cooling flush is that once you have a little bit of experience, you can actually manipulate the flavour of the espresso a lot more quickly than you can with a PIDded machine because you dont have to wait for the system to stabilise after each change.
At home, if I have a blend that I want to extract cool, Ill flush water for five or six seconds immediately before locking and loading. For normal temp extractions, I just flush for one or two seconds, then lock and load. If I want to heat it up a bit more than that, I flush, then go and do the grind/dose/tamp thing and then go without flushing. That last one doesnt seem to make as much difference as the massive cooling flush, though.
Like Java said, machines vary in their performance. For example, some machines might require water to be flushed for six or even ten seconds to reach a normal temperature.
Cheers,
Luca
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Re: Cooling flush
Josh,
The most common place for cooling flushes is in Heat exchanger machines where the water in the boiler is at 125C (or there abouts - depending on boiler pressure). After a short time at idle (several minutes) the water in the heat exchanger also gets to 125C.... which is just a tad hot for brewing coffee.....
So you push the brew switch and steaming, hissing water is released through the group..... and when the "water dance" stops - the water in the heat exchanger is the correct temperature for brewing....
Some non HX machines do need a cooling flush to reduce the temp of the boiler contents.... or to force the boiler to cycle so you can temp surf.... but more commonly they need a heating flush.... the water heats up the PF and group to the brewing temp before you load with grinds....
The procedure is very machine dependent.... so its a bit hard to provide a generic explanation....
Hope the above helps a bit...
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Cooling flush
Whats the deal with this? How do you know you are doing anything or the temperature to start with isnt right?
People talk about it alot, I just dont know how you judge it.Tags: None
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