HomeRoast Digest


Topic: varac (3 msgs / 99 lines)
1) From: Ray Kirkland
This is a multi-part message in MIME format.
my understanding of the using a Varac in home roasting is vague at best.
Are you lowering the voltage or raising the voltage.
In a counter top envirnment how big a unit should you consider.  (amperage
wise)
These things seem to run from 35 bucks to thousands. what prices are people
paying for what brand where?
I am sure that this subject has been beat to death before I arrived so will
welcome off line comments so as not to beat a dead horse on the digest.
Note: I am roasting with both a coffa Rosta and a older slightly modified AC
fanned 1400 watt? popper.
thanx
rayk

2) From: Mike McGinness
From: "Ray Kirkland" 
<Snip>
Depends on what you're trying to accomplish. Compensating for low ambient
temp' requires higher voltage, though I seldom even need 120v and vice
versa. Primarily I use it to slow the too fast roast. Sivetz professional
fluid bed roasters roasts in the range of 10-15min depending on batch size.
(was able to play with two different ones at Pele Plantations) Most, if not
all, home fluid bed roasters roast way too fast. My Rosto hits 440f roast
standard 120v voltage in about 7min. I get a much better roast, no
grassiness and better body, 440f in 12min. At 70f requires about 109v...
(I have not split the fan and heater yet, both controlled simultaneously
with variac. Plan/need to separate the fan and just control heat with
variac. Should have better control that way...)
<Snip>
people
<Snip>
Get one rated to handle your roaster. I roast with the Caffe' Rosto rated
13A. I, and a couple others, are using a 20A model that runs for $109.95
plus shipping. http://store.yahoo.com/webtronics/varacouttran.htmlWas
around $125 total if I recall and included a free DMM (have to enter the
offer code)http://www.web-tronics.com/freedmmoffer.htmlOthers I know use the 5A model by same mfg. and over fuse to 15A. I chose
not to go this cheaper, and in my opinion, foolish from a safey stand point
route.
MM;-) aka Kona Krazy miKe mcKoffee
Variable Variac Rockin' Rosto Roasting
Miss Silvia brewin'
homeroast mailing listhttp://lists.sweetmarias.com/mailman/listinfo/homeroast

3) From: Rick Farris
This is a multi-part message in MIME format.
Ray wrote:
<Snip>
I'm pretty sure Mike already covered the operating instructions.  Here's the
variac that is popular:http://store.yahoo.com/webtronics/varacouttran.html      This product is used to obtain variable AC output from a standard
110/120VAC source. There are many applications.
      Typical Applications Include:
      a.. Control Motor Speed
      a.. Control Label Printing Machine
      a.. General Use in Physics, Chemistry & EE Labs
      a.. Testing of Uninterruptible Power Supplies
      a.. Satellite Equipment Testing
      a.. Railroad Switching Testing
      a.. Telecommunication Equipment Testing
      a.. Vocational & College EE Lab applications
      a.. Testing Transformers
      a.. Automation Control
      a.. Stage Lighting Control
      GENERAL SPECIFICATIONS
      a.. 2000VA Variable Voltage Regulator(Variac)
      a.. 60Hz
      a.. Input Voltage: 110VAC
      a.. Output Voltage: 0-130VAC
      a.. Input Connector: 3-prong plug
      a.. Cord Length: 6 ft.
      a.. Analog Output Power Meter Included
      a.. On/Off Power Switch is Lighted
      a.. Carrying Handles
      a.. Fuse: 18A, 250V
      a.. Dimensions, approx: 9.9"L x 8"W x 7" H
      a.. Weight: 27lbs.
      Variable AC Output Transformer, VARIAC(AEEC-2090) AEEC-2090 1+
                  $109.95ea.


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