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Topic: Variac roast? (4 msgs / 72 lines)
1) From: Wendy Sarrett
This is a multi-part message in MIME format.
I have a question for those using variac.  I'm using a single variac
that I just got to control my WBII.  I set it for 115v and my roast took
about 12 minutes or so.  What do people usually set the level at or does
it vary a lot?  I find it harder to notice the first crack whereas
before Ist crack happened at roughly 3 minutes every time.  Any other
tips for experiementing with this?
Thanks!
Wendy

2) From: Jim Schulman
On 7 Feb 2003 at 18:58, Wendy Sarrett wrote:
<Snip>
There's basically two ways to go: 
First, set the variac fairly high at the beginning 
of the roast to get your usual warmup, then set it 
down (usually, you can go up too) as the first 
crack gets rolling, to get the roast timing you 
want. In general, roast time differences make a 
bigger taste difference after the first crack 
starts than during the warmup phase.
Second, use a roast thermometer, a stopwatch, and 
a time and temperature chart, sit by the roaster, 
and continuously adjust the variac to get exactly 
the roast profile you want. I'm posting a long 
piece on profiles, which may give some pause to 
being this over-precise.
Jim Schulman
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3) From: Wendy Sarrett
Thank you for your insight both in this reply and that excellent posting
on your profile experiment.  One thing I noticed is you keep the voltage
a bit lower than I was doing it.  I'll have to play with it.
Thank you again!
Wendy
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4) From: Mike McGinness
From: "Wendy Sarrett" 
<Snip>
Wendy,
Note that Jim was varying heater voltage with FIXED fan voltage. This is
very different than single variac controlling heater & voltage
simultaneously. Heater & fan tied together will see less temp change for a
given voltage change. Less voltage will yield less heat & less air movement
which results in more heat with a net of less heat and less bean movement.
More voltage with paired heater/fan the opposite. With fan/heater tied
together you're limited on how low you can go voltage wise without loosing
bean movement...
MM;-) aka Kona Konnaisseur miKe mcKoffee
Dual Variable Transformer Rosto Roasting
Rocky grindin' - Miss Silvia brewin'
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