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BarryR
Senior Member


Joined: 21 Nov 2010
Posts: 279
Location: Wilbraham
Expertise: I love coffee

Espresso: CC1
Grinder: Baratza Preciso
Drip: Behmor Brazen, Clever...
Roaster: Hottop KN-8828B2-K
Posted Mon Aug 6, 2012, 7:13pm
Subject: Variac Question
 

My father (a retired electrical engineer) has an old 7.5 amp variac. It's probably from the days when many things were still manufactured in America.
It's not being used and it's no big deal if I burn it out.
It also has a non-grounded plug and I can't remember if the behmor is 2 prong or 3 (I'm not home so I can't look).

My question is: should I use this variac?
Is the worst case senario that the variac gets burned out?
Is it almost a given that it will damage the variac?
Thanks.
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Prof
Senior Member
Prof
Joined: 10 Sep 2004
Posts: 715
Location: Seattle
Expertise: Pro Roaster

Espresso: PV Lusso
Grinder: Pharos 696
Drip: Aeropress
Roaster: Behmor 1600+
Posted Tue Aug 7, 2012, 6:12am
Subject: Re: Variac Question
 

I think you need at least a 12A (maybe 15A) capable variac for the Behmor.  I lost a couple 10A fuses on my Powerstat variac before I stopped using it with the Behmor.  I have a plug to ignore the ground.  

The variac has worked fine with the Poppery I.

 
LMWDP # 010
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GVDub
Senior Member


Joined: 25 Jan 2008
Posts: 881
Location: Los Angeles, CA
Expertise: I live coffee

Espresso: Londinium I, Arrarex...
Grinder: Gaggia MD85, Dienes Mokka,...
Drip: Behmor Brazen, Abid Clever
Roaster: Behmor 1600+
Posted Tue Aug 7, 2012, 10:14am
Subject: Re: Variac Question
 

The Behmor pulls about 1650 watts at max (heater on full, afterburner on), which pretty well maxes out a 15 amp circuit. Average load over the course of a roast is somewhat less, but you need to have a Variac that can handle the max current draw, so, no, a 7.5 amp variable ac transformer will not work with a Behmor.
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BarryR
Senior Member


Joined: 21 Nov 2010
Posts: 279
Location: Wilbraham
Expertise: I love coffee

Espresso: CC1
Grinder: Baratza Preciso
Drip: Behmor Brazen, Clever...
Roaster: Hottop KN-8828B2-K
Posted Tue Aug 7, 2012, 7:43pm
Subject: Re: Variac Question
 

Thanks everyone. I decided not to take my father's ancient Variac off his hands.
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