HomeRoast Digest


Topic: WBII at 115 V (2 msgs / 58 lines)
1) From: Mark Neuhausen
Dumb luck or what?  All this reading on variacs and dual variacs, and I
started paying more attention to the roasting time of my popcorn popper and
others.
I have a West Bend Poppery II.  I've noticed how most people have WBIIs that
can turn coffee beans to charcoal in under ten minutes.  I modified mine to
be able to turn the main heater coil on and off.  With 2/3 cup of beans (4
oz.), and using no heater control, the profile is very nice.  First crack
starts at about 6:30 and ends at 8 minutes, and second crack starts between
13 and 14 minutes.  The batch size is also almost perfect as I am the big,
almost solo coffee drinker in the house.
That led me to think that the extension cord I am using might be giving me a
perfect voltage drop.  I bought a cheap Digital MultiMeter today (seems like
yesterday that I was so pleased with my not so cheap Vacuum Tube VoltMeter)
and measured my outlet voltage and voltage at the end of the extension cord.
120.3 V at the outlet, 119.4 V with just the motor in-line heater and motor
on, and 115.3 V with the full heater on.  The extension caused an additional
..2V drop.  I am curious what else is on the circuit and will check that
tomorrow.  For now, it looks like my in-house wiring is the perfect variac
for me.
-Mark
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2) From: Ben Treichel
Another cheap solution is to wire the fan separately (don't remove the 
diodes) and place a dimmer switch in the fan circuit. This will allow 
you to control the air flow, which will allow you mild control over the 
temp (faster fan, cooler air - etc.)  Also by doing this mod, you will 
cut out the 2nd'ry heater coil that is used to drop the voltage for the 
fan. Be careful you don't put more than ~ 20 volts AC on it, or you 
could need a new fan.
Also, I have a heater in my office that was plugged into the same 
circuit. This is good for about 2.5 volts @ my office. The question is 
if the breaker will take it.
Here's a profile to try.  4 minutes to 375, 4 minutes to 400, and 4 
minutes to 425, and then whatever else time needed to get where you 
want. On my  dual variac FR+ roasting 4 oz (fyi your WBII should do 4 oz 
unmodified), if I set the voltage to 102.5 and hold it to 375, and then 
step down to 95, its close to the 4/4/4 profile. I came up with this 
profile thinking that since most of the interesting stuff happens 
between 375 & 425 (and beyond) that that was where I wanted to spend 
most of my time.
Ben
Mark Neuhausen wrote:
<Snip>
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