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Old 10-20-2012, 11:13 PM   #1
Oct 2010
Avon Lake, OH
Posts: 48
Liked 1 Times on 1 Posts

I have a A19AAT johnson control for my fermentation fridge. It's out in my patio and it's going to get really cold out there, I want to do the thing where I put a light bulb in the fridge to warm it up to ferm temps in the winter. For that I want to "reverse" my control to turn on the lamp when the temp dips below 65. Anyone know how to do that? I don't have the original manual.

Thanks in advance!

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Old 10-21-2012, 01:22 AM   #2
Aug 2012
Fort Meade
Posts: 813
Liked 47 Times on 43 Posts

You can download the manual from their web site so that's what I'd suggest. Beyond that, I believe there are two basic options. The first being you switch to the NC contact. The second being you flip one of the jumpers. And well I guess there is a third, which is use an STC-1000, which has separate heating and cooling contacts.

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Old 10-21-2012, 01:57 AM   #3
Oct 2012
Boston, MA
Posts: 2

Use the "make on drop" contact to power the bulb.

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Old 10-21-2012, 02:04 AM   #4
May 2011
Stow, MA
Posts: 17,804
Liked 3073 Times on 2300 Posts

Multiposting is bad. Don't multipost, mmmmkay?

Here is the manual for that controller. It does not appear to be capable of controlling a heating unit.


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Old 10-21-2012, 01:35 PM   #5
Senior Member
cfrazier77's Avatar
Mar 2011
Troy, IL
Posts: 668
Liked 95 Times on 65 Posts

Originally Posted by day_trippr
Multiposting is bad. Don't multipost, mmmmkay?
I just had an Office Space flashback. Thanks!

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