Originally Posted by frothus
Let us know how that goes. I am building a keezer and was just given what I believe to be an STC 1000. It looks the same, except it doesn't actually have "STC 1000" lettering on the front. I'm wondering how to use it [safely]. I already had a Johnson controller coming in the mail from the Beverage Factory so my current thought is to run them in series to prevent my beer from freezing in case one of them dies.
If it doesn't say STC-1000 on it, it could very well be the similar single stage unit. If so, since you're using it for a keezer, it should work just fine. I have one installed in the collar of my keezer. Let me know if you have questions with the wiring, since it's a little different than the STC-1000.
And I don't know if wiring two controllers in series is such a good idea. There's a lot of issues that could create, and it doesn't really protect against much. A controller dying is much more likely to cut power completely rather than freeze the beer, which a second controller wired in series won't fix. Even if a controller does freeze your beer from a malfunction, it won't really hurt your beer.