HomeRoast Digest

Topic: Air Quenching / Cooling the roast (5 msgs / 235 lines)
1) From: wizg
The circuit diagrams of the Poppery II on the Web sites that deal with
modifications show two heater coils inside -- a main one for heating the
payload and a smaller one labelled as a "motor heater." I don't know why
the motor would need its own heater, but a modeification to put a switch
on the main heater coil circuit leaves the motor heater in business. I'm
guessing that the hot-air roasters, like the Fresh Roast, have a similar
design, and that the cooling cycle cuts off the main heater but leaves
the smaller coil on. That would explain why these roasters blow warm air
during the cooling cycle even when a cool roaster is turned on just to
the cooling cycle. If quick cooling is desired, I think a fan or air
conditioner vent works better.
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2) From: R.N.Kyle
This is a multi-part message in MIME format.
That is correct the motor heater, is not to heat the motor, it is to =
reduce the voltage to the motor to about 20 V . I by passed this heater =
and found that the motor goes into hyper speed, surely to ruin the motor =
.. so I hooked it back up. The 3 way switch allows me to turn everything =
off in the center of the switch. one down for roasting, and one up for =
cooling, with a small amount of heat, but still reduces heat from 450 to =
175 in about 1min, I then dump the roast into a colander to finish =
Ron Kyle
a coffee roaster from South Carolina

3) From: Dan Bollinger
This is a multi-part message in MIME format.
You could make the cooling cycle cooler by putting this 'motor heater' =
(which is actually a motor voltage reducing resistor) outside of the air =
flow in some sort of ventilated, grounded, metal, electrical enclosure =
or box.  Dan

4) From: EskWIRED
Cold motors work horribly!
But seriously, the motor heater is used to drop the voltage to the motor.
It could have been done with a transformer, but that would have been heavier
and more expensive, and heat output is needed anyways, so they use a
resistor made of heater wire to do the job.  Hair dryers do the same thing.
The motor in a Poppery II style popper runs at about 20 volts.
but a modification to
That is a simple mod.  Before I installed the transformer, I just used two
switches.  One was for the main heater, and the other was connected to the
fan and the motor heater.  I could adjust the heat somewhat by turning off
the main heater, if I wanted to prolong any portion of the roast.  I could
also partially plug the air outlet if I wanted to speed up any portion of
the roast (I used my metal measuring cup, wearing heavy gloves).
That works great, but it is inconvenient.  Additionally, there's no way to
do a cool-down in the roaster, because the motor heater is always on.  I
recommend it highly as a first step, to see how you like nursing the roast
along, rather than just plugging your roaster in and waiting until it is
done.  I'm a very hands-on cook, so I like sitting there with my fingers on
the buttons and dials.
I think an AC vent is an awesome idea, especially one on the floor.  If my
AC was set up differently, I'd make an adaptor out of a box and a colander,
by cutting a round hole in the top for the colander, and setting the
open-bottom box over the vent.  Frigid, low-humidity air sounds a lot better
to me than the 94 degree soggy air I used yesterday to cool my beans!
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5) From: R.N.Kyle
This is a multi-part message in MIME format.
Hey Dan, you are right about that, I think I'm going to do the =
modification, that someone earlier posted about. sorry I can't remember =
his name. but here is the link to help those who want to modify there =
Popperyhttp://www.geocities.com/Athens/Oracle/8104/popper.htmlRon Kyle
a coffee roaster from South Carolina

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