STC 1000 issue

[JFL3377]

So I was handed down a half built keezer with an stc 1000 wired directly to the compressor. I finished the build and have been drinking my first kegged home brew for a month but I've blown out two STC's both on really hot days. The wiring of the STC looks like what I see it should be online with the exception of a small wire that runs from the 1 terminal to the 7th slot. I also poked a small hole in the keezer shelf to run the temp probe directly from the stc through the shelf floor without having to go through the collar etc. My guess is I need to wire it differently or that on really hot days water is making it way down the cord and frying the exposed stc but these are just guesses. I did install two computer fans on the lid facing down that I can turn on when I want them to distribute temp evenly. I also have got a dehumidifier and damp rid to help with the moisture. My third stc controller shows up tomorrow and I will seal the hole that probe comes out. Any other advice? Anyone have this sort of problem where they come out and the stc has turned itself off and then when you turn it on the temps jump all over the place? Thanks in advance.

 

[Venari]

What's the amp rating of the STC compared to the rating of the compressor?

If the compressor has more amps, you need a fuse in line with the STC power. (perhaps a 10 amp fuse going into the 1 terminal)

Then again, I haven't hooked up my STC yet, so I'm not sure what I'm saying has any merit.

 

[jleiii]

What does 'blows out' mean? Stops cycling the compressor? Fails with noise and smoke? You find it blank/off and won't turn back on?

The STC's are rated at 10 amps. What is the current draw of the cooler?

Is the compressor delay set sufficiently long enough to allow the pressure to dissipate before it tries to restart?

I've been using them on a glycol chiller (formerly a dehumidifier) that draws 7.3a, and a cooler (not sure of current) for 2+ years and no issues.

 

[Hoppity]

Sounds like it is overheating or shorting out. Is it in the garage or outside? What is the operating temperature range of the unit? Any other sources of moisture to unit?

 

[day_trippr]

The "temperature jumping all over" makes me suspect condensation is the culprit. It's clearly not load related...

Cheers!

 

[JFL3377]

Thanks for the replies, I didn't notice them or I would've responded sooner. It turns out the issue was water leaking down into the stc-1000 unit. I've fixed the issue and haven't had any problems with my new inkbird-1000 unit.