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Help with variac please
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MoJoeCoffeeRoaster
Senior Member


Joined: 19 Aug 2011
Posts: 12
Location: Vegas
Expertise: I love coffee

Posted Tue Oct 16, 2012, 9:55am
Subject: Help with variac please
 

I was looking to get a variac to control my heat gun on my corretto roaster.  I was looking at a 175 dollar one on amazon it is rated for 2000 watts and 20 amps.  The problem is when i turn down the heat the fan will slow down.

So my question could i re-wire the heat gun so the fan just plugs into the wall and the heating element runs off the variac?

Also what power variac could i use if it is just running the heating element?  There is a 3amp one on amazon for 50 bucks or so

My heat gun says 1500 watts and 12 amps


Thanks for all your help.
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dyqik
Senior Member


Joined: 7 Oct 2011
Posts: 383
Location: Cambridge, MA
Expertise: I love coffee

Espresso: Bezzera BZ07 PM
Grinder: Baratza Virtuoso Preciso...
Vac Pot: Cona D
Drip: Bona-Vita, CCD, Aeropress.
Roaster: Gene Cafe, Modded Poppers
Posted Tue Oct 16, 2012, 1:17pm
Subject: Re: Help with variac please
 

There's a cheaper way to reduce down the power to the heater if you are going to be playing around inside your heat gun to separately power the fan and heater - either install a 1500W lighting dimmer control, or buy an adjustable heat gun ($60-95 on homedepot.com ?).  Either should be much much less than $175.

Almost all of the power of the heat gun will be used by the heater, so you'd still need a 1500W capable controller.
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MoJoeCoffeeRoaster
Senior Member


Joined: 19 Aug 2011
Posts: 12
Location: Vegas
Expertise: I love coffee

Posted Tue Oct 16, 2012, 2:12pm
Subject: Re: Help with variac please
 

That's great advice, I did think about that after I posted that and did some more research.  I definitely don't need the variac, the setup full blast has plenty of power, just need to something to turn it down.
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oldgearhead
Senior Member
oldgearhead
Joined: 25 Jan 2010
Posts: 396
Location: Go Colts!
Expertise: I like coffee

Grinder: Virtuoso by Baratza
Drip: Chemex,Dilongi DCM900
Roaster: 1/2K Fluid-bed
Posted Wed Oct 17, 2012, 12:11pm
Subject: Re: Help with variac please
 

...but, if you are going to continue with you experiments, a varible-autotransformer is very, very,
nice to have. Especially one with some voltage boost...also, a good router speed controller is a bit nicer than a dimmer to deal with...
http://www.harborfreight.com/router-speed-control-43060.html
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dyqik
Senior Member


Joined: 7 Oct 2011
Posts: 383
Location: Cambridge, MA
Expertise: I love coffee

Espresso: Bezzera BZ07 PM
Grinder: Baratza Virtuoso Preciso...
Vac Pot: Cona D
Drip: Bona-Vita, CCD, Aeropress.
Roaster: Gene Cafe, Modded Poppers
Posted Wed Oct 17, 2012, 12:13pm
Subject: Re: Help with variac please
 

oldgearhead Said:

...but, if you are going to continue with you experiments, a varible-autotransformer is very, very,
nice to have. Especially one with some voltage boost...also, a good router speed controller is a bit nicer than a dimmer to deal with...
http://www.harborfreight.com/router-speed-control-43060.html

Posted October 17, 2012 link

Cheaper too.

I should've searched for one of those when I was looking for a dimmer...
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