Temperature Controller

Hi all, I'm not at all a DIYer so apologies in advance for my stupidity. I live overseas and bought a Johnson temp controller. I ordered the Johnson A419ABG-3C, to be exact. I did a lot of research on here about the different 419 models, and from what I understand, there are basically two models -- one that is duel 110/240v and one that is 24VAC. It seems that the different model numbers for the A419A are just references to longer leads, longer temp probes, etc.

The one I ordered came pre-wired for 110v -- I just figured I'd re-wire (with appropriate gauge wire) for 220v. When I got my controller, the technical specs sheet says 110v input only. I assume this is because it's pre-wired for 110v, but went ahead and emailed the company I ordered from to be sure. I explained my story to the company and they told me that I should return it -- that it's not able to be converted/re-wired for 220v.

So...I took it apart and it seems there's a spot for a 240v input. I think I just answered my question -- but want to make sure not to blow the thing up. Did I just get bad advice from the company? Am I missing anything or can I go ahead and wire for 220v?

Appreciate any help you guys/gals can give a newbie.

Thanks much,
Dan

 

Hi

I'd go with the advice from the people who made it. The load contacts are probably fine for 220, but the controller power it's self sounds like it's not. Chinese 220 V controllers are a staple item on eBay - cheap and easy to get. I'd go that route.


(did more research - see message below)

Bob

 

I concur with carlisle_bob, the issue is the power supply to the "brains" likely are sourced via a transformer that wants a 110 vac input. Now, if you wanted to hack the unit, find that transformer and replace it with one that will provide the same output voltage(s) from a 220 vac input...and hopefully fits in the same space...

Cheers!

 

Hi

Did a little digging.

http://cgproducts.johnsoncontrols.com/CAT_PDF/1927385.PDF

seems to say that your unit is indeed rated for 220V use. Since it's from the people who made the controller, I'd say it's good information. I would suggest you email Johnson and see if the document is correct.

This is a similar document that goes into a bit more detail:

http://cgproducts.johnsoncontrols.com/MET_PDF/125188.PDF

It's not specific to your controller, but it's saying the same thing.

Bob