HomeRoast Digest


Topic: descaling (10 msgs / 441 lines)
1) From: Barry Luterman
This is a multi-part message in MIME format.
The more I think about it the more sense it makes.
1. There is only one reservoir
2 The reservoir fills both boilers and supplies water to the HX.
3 Therefore adding citric acid to the reservoir and draining through the =
group head, the steam wand and the hot water wand should clean the =
entire system.
4 On the Brewtus one must remember to remove the water softener before =
decaling.

2) From: Michael Dhabolt
Barry,
I don't remember if the Brute has boiler drains or not.  If it does,
uplug the machine (don't want the heater on with an empty boiler) and
drain the boilers - then refill with descaling solution.  Check out
what your owners manual says about filling a dry boiler.  It goes
quicker - - otherwise you are diluting the water already in the boiler
with the solution and takes quite a bit of extra solution to get it to
full strength in the boiler - it normally takes approx. six to seven
boiler volumes of 'feed and bleed' to get the liquid in the boiler to
'pretty close' to the same strength as that of what is being fed to
the boiler.
An alternative is to do the math (so you get the acid molarity you
want in the boiler), and fill from the reservoir with whatever
stronger solution of Citric acid is required.
Mike (just plain)

3) From: Barry Luterman
Thanks Mike makes sense. Will save your message. Won't need to descale for 
about another 11 mos. By then you or McKoffee will have come to visit.We can 
all do it together while I tune my car radio. No truthfully I finally 
understand and will be able to do it when the time comes.

4) From: Obrien, Haskell W.
I just descaled my giotto last night.
I picked up some citric acid from the brew store and pulled the water =
sensor connection to fill the boiler completely.
Things got entertaining when the sensor rod came up with the connector =
once.
After a few hours I flushed it all out and got a nice greenish solution. =
(from the copper)
I'll probably run a few more gallons through tonight.
--this is alot faster with my giant rotary pump.

5) From: Leo Zick
any more detail on giotto cleaning?  :)
im a bit hesitant to try, though im sure its not too hard.  where is the water
sensor? one of the connections on the pressurestat?  howd you know the boiler
was filled?  did u open the steam wand a bit and waited till some water 
dripped
out?
thx!!
Quoting "Obrien, Haskell W." :
<Snip>

6) From: Obrien, Haskell W.
Leo,
I'll toss together some instructions in a few minutes.

7) From: Obrien, Haskell W.
As promised.http://biobug.org/coffee/giotto/descaling/It's pretty wordy, but hopefully it'll make sense. I didn't proof it
very hard, but all the ideas are there. Let me know if you see anything
missing.
Will

8) From: Leo Zick
nice site! ill browse through it tonight, but you need details on your 
mods. :)
i just bought a float kit and hope it will work nicely, def tired of 
filling all
the time, although the drain is much worse!
thanks for the writeup!
Quoting "Obrien, Haskell W." :
<Snip>

9) From: Obrien, Haskell W.
As soon as my last few bits show up with the fed-ex man, I'll be writing
up a how-to on the mods. I'll be published around Tuesday.

10) From: Leo Zick
Thought id add a few comments here, since you were nice enough to provide
the writeup.. :)
I used 2 tablespoons of citric acid, 2 tsp didn't seem to be nearly enough
to me.
I didn't open the steam valve when filling the boiler with solution.
Actually, I tried opening it, it didn't do much since there wasn't much
heat/pressure left from emptying the boiler.  It was still easy to tell when
the boiler was completely filled, the water came out of the water sensor
hole.
After it filled, I left the machine on, let it sit a bit, then drained off
some of the water (half a cup maybe) from the water valve.  
While it was on, I ran solution through the grouphead a couple of times, as
well as through the water and steam valves.  Some black crap came through
the steam valve!  After running through the steam and water valves, I
refilled the boiler with solution until it came through the water sensor,
bled it off a bit again, and let it sit, on, for about 2.5 hours.  The heat
wasn't holding to my satisfaction with it off.  
I emptied from all valves, the water came out with a blueish tint.  Flushed
with 2 resevoirs worth of water, rinsed the resevoir, then refilled it twice
from my filter/plumbed line and drained.  It tasted great and by the end
came out clear. 
Ran a dump shot, and done!
Didn't see much except from the steam wand, but the machine is running
better it seems. Not working as hard, sounds more quiet, when pulling shots.
Thanks for the writeup!


HomeRoast Digest