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Old 01-02-2013, 08:01 PM   #1
PtreeCreekBrew
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Nov 2012
Posts: 68


I need to control an extra fermwrap right now. I have Ranco digitals on my other ones but I have an older Johnson A19AAT-2 that I usually keep for cooling only.

I opened it up and; the cover, of course, states "Close on Decrease" and it's currently wired to COM and 2...has a "3" slot, which I'm assuming that I would swap the hot wire over to, provided this particular model can support that.

I couldn't find any literature stating that the AAT-2 was or was not capable of "close on increase".

Thanks!



 
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Old 01-03-2013, 09:48 PM   #2
Junkster
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Feb 2011
North Central, Ohio
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I would think that if you've used the Johnson Controls for cooling that it would be the "close on temperature INCREASE" so that the compressor starts and cools it down until it opens on decrease.

Data I've seen on that unit says it has a SPST switch which would be just the two terminals for wiring. Most units I've worked with that have 3 screws factory-equipped are SPDT switches which would probably work for your application. If the 3 slot has metal in it for a screw, it may work - check it with a meter. If not, the same plastic housing may be used for both types but the inside is different in which case you're out of luck.



 
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Old 01-04-2013, 04:27 AM   #3
WPStrassburg
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Sep 2008
Rochester, NY
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Power it up and check with a multimeter to see if voltage is applied to the third terminal. Is there any wiring to the terminal on the backside?

Look to be SPST from the cut sheet though

http://cgproducts.johnsoncontrols.co...&req=a19aat-2*

 
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Old 01-04-2013, 10:44 PM   #4
PtreeCreekBrew
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Nov 2012
Posts: 68

I'd left my multimeter on my boat when I winterized

Catt22 confirmed to me that most of the Johnsons are 2 switch, so I went with it, and it does in fact close on decrease when the hot wire is switched to the location labelled "3".

 
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