[Homeroast] temp control for sc/co

Martin Maney maney at two14.net
Sat Jan 15 20:20:58 CST 2011

On Tue, Jan 11, 2011 at 10:16:54PM -0500, Edward Bourgeois wrote:
> On Tue, Jan 11, 2011 at 10:02 PM, Edward Bourgeois <edbourgeois at gmail.com> wrote:
> > On Tue, Jan 11, 2011 at 8:15 PM, Bill Chambers <bill at billchambers.com> wrote:
> >> Has anybody used a speed controler such as this
> >> http://www.harborfreight.com/router-speed-control-43060.html
> >> for controlling temperatures on a convection oven?

> > For the heating element you want a 15amp dimmer or variac and by-pass
> > the thermostat. You will want to put the fan on a separate line to
> > keep it at full speed
> > http://www.coffeegeek.com/forums/coffee/homeroast/329082

> Depending on what model top you have you may be able to use a 1200watt
> dimmer, if the top is over 1200watts(older galloping gourmet tops) go
> with a 1500watt one. Do not use an under-rated one.

And that's just what the HF box is - a 15A (1800W notional) dimmer.  If
anything, it can likely handle more power in an easy resistive load
like a heater - motors tend to stress the triac or SCR more with their
partly reactive load lines).

He that questioneth much shall learn much, and content much; but
especially if he apply his questions to the skill of the persons whom
he asketh; for he shall give them the occasion to please themselves
in speaking, and himself shall continually gather knowledge.  But let
his questions not be troublesome, for that is fit for a poser; and
let him be sure to leave other men their turns to speak.  - Francis Bacon

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