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Anyone ever disabled the thermostat on a turbo crazy?
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TeddyMac
Senior Member


Joined: 28 Nov 2013
Posts: 29
Location: Boston MA
Expertise: I love coffee

Grinder: Capresso Infinity
Vac Pot: Yama stovetop, Hario...
Drip: Hario woodneck, Bona-Vita...
Roaster: Behmor 1600
Posted Tue May 13, 2014, 8:05am
Subject: Anyone ever disabled the thermostat on a turbo crazy?
 

I've had no luck getting my turbo to work successfully. The convection top seems to be under powered, and the heat clicks off very easily and the beans just stall. I think I may have hit first crack once, but it was a sputter rather than a roll. I've tried 6- to 10-oz batches, and I've used a variable voltage regulator (aka variac) with a Kill-a-Watt to ensure that there's 120v going into the roast. I've tried using the turbo to raise the heat steadily, and I've tried cranking it at max the whole way with a 400 degree preheat before the charge.

What I'd like to do is disable the thermostat and use the variac to steer the roast. My hope is that this would allow the heating element to stay on as the power to the turbo is increased or kept steady. And no worries, while I'm aware of the potential fire hazard, I've never once walked away from a roast!

Has anyone done this? And if so, are there any instructions out there? I've google'd this so much that I've practically worn out the internet, though there's always the possibility that I missed a key element in the search criteria, so I'm turning to you folks for a how-to.

Thanks for any help with this. I'm so jealous of all the great testimony I read here about turbo roasts, and I'm disappointed that it's not yet worked for me. I'm open to ways of trying to fix the turbo before fiddling with it, but I've read and searched everything I could find here on the forum about improving the turbo's performance, and nothing has seemed to work for me.

(I forgot to mention, I'm using a HomeTrends 1250w convection top.)
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CoffeeRon
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CoffeeRon
Joined: 26 Apr 2009
Posts: 748
Location: Tacoma Wa.
Expertise: I love coffee

Espresso: Wega Lyra, Europiccola(still...
Grinder: Macap M7D, Pharos, Vario W,...
Vac Pot: Sunbeam CoffeeMaster
Drip: Melita BCM-4
Roaster: FR SR500,B-1600, SC/TO
Posted Tue May 13, 2014, 9:46am
Subject: Re: Anyone ever disabled the thermostat on a turbo crazy?
 

I have no experience or knowledge of the HomeTrends but I have "modded" the Sunpentown. The thermostat and power switch have both gone out on me over the years. I replaced the power switch with a standard toggle switch and by-passed the thermostat. I have had no problem with it but won't guess as to the build quality of the Hometrends in comparison.

Doing it was a bit of a PITA. working from the bottom and carefully taking it apart piece by piece up thru the top. Making note of where the wires went that I disconnected as I went. The nut on the fan was reverse thread.

The Sunpentown is 1200 watt and I've never had a problem getting enough heat out of it. Someone over on H-B was having that problem as well though and keeps the heat on on the stir crazy to add the extra heat he needs.

Hope this helps,
Ron
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TeddyMac
Senior Member


Joined: 28 Nov 2013
Posts: 29
Location: Boston MA
Expertise: I love coffee

Grinder: Capresso Infinity
Vac Pot: Yama stovetop, Hario...
Drip: Hario woodneck, Bona-Vita...
Roaster: Behmor 1600
Posted Fri May 16, 2014, 6:20am
Subject: Re: Anyone ever disabled the thermostat on a turbo crazy?
 

Thanks, Ron. I know what you mean about the PITA factor. I just dipped my toe into the DIY waters and realized that even the first layer to remove has a hidden layer, a set of 5 screws obscured under little, round gaskets. If that's only the first layer, this may require more patience than I'm capable of. I'll open it up a little further, but in the end I may just decide to sell the gizmo.

I'll look at the H-B site to see what others' experiences are. I may need to re-connect the stir crazy heat, though some folks have reported that it doesn't make much of a difference for them.

Thanks again, and I'll remember to make notes about where the wires go as I disconnect them. Hadn't thought about that crucial bit!
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walkinghispath
Senior Member


Joined: 18 May 2014
Posts: 17
Location: Worldwide
Expertise: Pro Barista

Espresso: Kitchenaid Pro Line (PID'd),...
Grinder: Kitchenaid Pro Line (Mazzer...
Drip: Krups grind and brew for the...
Roaster: Dog bowl and a heat gun
Posted Sun May 18, 2014, 5:05pm
Subject: Re: Anyone ever disabled the thermostat on a turbo crazy?
 

My first roasting adventure was a turbo crazy but my turbo oven mounted in a clear plastic housing, not a glass one.  It just wouldn't get hot enough so I bypassed the thermostat and tried again.  I managed to get the beans roasted but I melted the drive shaft of the stir crazy and melted the turbo oven enclosure.  I still have the heating element part (it survived the heat) so I plan to get some sheet metal and try again someday.  The moral of the story is, if you bypass the thermostat, things melt, use metal stuff.
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Armbie
Senior Member


Joined: 18 Jun 2008
Posts: 3
Location: North Vancouver
Expertise: I love coffee

Espresso: Krupps "steam toy"
Grinder: cheapo electric blade
Posted Tue Jun 17, 2014, 11:12am
Subject: Re: Anyone ever disabled the thermostat on a turbo crazy?
 

I had the same problem as you and ended up removing the thermostat. Now the turbo oven lid goes full bore when on. What I did to control power/temperature is leave the thermostat connecting wires sticking out one of the ventilation slots in the top of the lid. I always meant to at least get a switch but never did. I do have greater ambitions of hooking up an Arduino with a thermocouple and controlling the power with that thermostat connection. I have all the hardware, Just can't find the time. For now I just manually short the wire together at three, four or five minute intervals to control the roast. Works well enough for me but it's a very ghetto method :)
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