HomeRoast Digest


Topic: need help from rosto users (5 msgs / 107 lines)
1) From: jeff
hi all-
i bought a used caffe rosto w/ the caveat that it was not roasting dark. 
well now i have it and it's as advertised even inspite of the mods 
recommended by Tom. a full 13 min run gets me to a city+. judging by the 
sound of the coil cycling on and off late in the cycle, it is my guess 
that the thermostat is kicking in too soon and preventing the unit from 
getting to temps required for a darker roast. i have not probed the 
temps but have not been able to hit 2nd even w/ changes to batch size, 
changing the airflow, etc.
any suggestions? is there a quick fix for the thermostat as there is for 
the poppery I or II?
also, this one's mostly for you mike, how do you manage to get 1/2 lb 
roasts w/o blasting a bunch of beans into the chaff collector?
thanks-
jeff r
austin, tx

2) From: miKe mcKoffee
Quick fix for Rosto thermostat: by-pass it. Don't need it IMO and
experience. Unless you go off and leave the Rosto running unattended...
which of course is never a good practice.
1/2# batches: first I wouldn't attempt it without both fan and heater
individually variable boost voltage controlled. I raise the front of the
Rosto 1&1/2 inches tilting back away from the chaff collector, rests on 2x4.
Still sometimes get a few beans in the collector, no biggy, they're roasted
too. Now if and when you attempt a full pound batch then you'll really stuff
that chaff collector! (only did it once, don't suggest it:-)
BTW, if you put 1/2# greens in your Rosto and it blasts the greens around in
a fast enough circular tornado to quickly fill the chaff collector you have
one good strong fan motor! Even pushing 140v to the fan of any of my three
Rostos 1/2# greens barely move, sometimes use a bit-o-rockin' in addition to
tilt.
Kona Konnaisseur miKe mcKoffee
URL to Rosto mods, FrankenFormer, some recipes etc.http://mdmint.home.comcast.net/coffee/Rosto_mod.htm

3) From: jeff
thanks mike-
will bypassing the thermal fuse (as shown on your page) enough? it looks 
as tho there is another thermostat (bi-metal type similar to that on the 
poppery II).  not sure if that needs to be tweaked or not. on a trial 
run i did about 6 oz and the roasted beans came almost to the lip that 
feeds into the chaff collector, hence my surprise at 1/2 lb. barely 
moved the greens. need to shake!
-jeff
miKe mcKoffee wrote:
<Snip>

4) From: miKe mcKoffee
No, the thermal fuse doesn't cut in and out. It's strictly a juice flow
through safety device. If it blows, you'll have no heat at all. You are
correct you'll need to jump the bi-metal thermostat. I forgot I don't have
any pictures posted showing that being done. But obviously you already see
it!
You might be surprised at the bean movement difference between 6oz & 8oz
greens. The beauty of split wired dual voltage control is being able to
adjust both heat & fan voltages for any batch size from 1 to 8oz (or more)!
Kona Konnaisseur miKe mcKoffee
URL to Rosto mods, FrankenFormer, some recipes etc.http://mdmint.home.comcast.net/coffee/Rosto_mod.htm

5) From: jeff
any suggestions on how to get past the bi-metal jobby? it is tough to 
tell what part of it to mess with.
-jeff


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