HomeRoast Digest


Topic: variac question (5 msgs / 96 lines)
1) From: susan oppenheim
thanks so very much for all your thoughtful and knowledgeable responses.
I'll take the emails with me-and the popper-to an electronic store here in
canada
cheers
susan O

2) From: Dennis Guyer
My normal line voltage is 117.5.  I am wondering if using a Variac would be of help.  The only one I have found in my price range is at Fry's and it will handle 1000 watts.  I see the Behmor is rated at 1650 watts.  If this will not handle the power, what are others using?  When I am roasting my line voltage drops to around 114 to 114.5 most of the time.  On some good days it will hit 15 to 15.5.  Any suggestions?  Is it worth it to use the Variac or will it make little difference?
Thanks for any input,
Dennis G
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3) From: Michael Mccandless
The key is uniformity.
Line V can change @ different times of day.
Variac rating should exceed the device rating.
MMc
On Sat, Aug 20, 2011 at 3:52 PM, Dennis Guyer  wrote:
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4) From: Dean
Dennis,
Last question first: it will likely make little or no 
difference--you're only seeing a 2% under "nominal" no-load and 
another 3% sag under load. (old school said 110-120 was normal voltage 
at the outlet in USA)
With a 15(20) min roast 5% is 45(60) sec and that's the "range of 
normal" that I find with my Behmor. (Though it's a great rig for a 
400g roaster, the cycles show a fair degree of variation, and even 
with all the settings it's hard to control well--I had better control 
with my Rosto, but much smaller batches)
As far as sizing I respectfully disagree with MMc: per the website for 
superior electric, the ratings are continuous duty.  If you allow some 
time to cool down you can exceed the rating for a while.  Search the 
archive for something that I discussed with miKe mcCoffee a few years 
ago.  I think that a 1000w unit would be adequate for batch use, but 
check the duty cycle first...
Dean
Havin a martini in da weeds......
On 8/20/2011 6:49 PM, Michael Mccandless wrote:
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5) From: Dennis Guyer
Hi Dean,
I think you have giving me the answer I was looking for.  I really didn't 
want to spend $150 on an additional piece of equipment.  If it won't make 
all that much difference, I'll just do with the voltage I am dealt.
Thanks for the explanation,
Dennis G


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