STC 1000 problems

[amandley]

So I got the STC 1k from ebay, delivered promptly. I went to wire it up today and cannot get it to work. Was wondering if any of you guys that have experience with this thing can give me some pointers. I originally wired a cut power cord hot and neutral directly to the STC and ran the ground to a regular household outlet. I then ran hot and neutral from the "cooling" hook up on the STC to the outlet. I plugged in my outlet tester, nothing. No lights whatsoever. I then checked power from the power cord on my multi meter. 117 V. Good to go. I checked again at the power in on the STC, 117 V, good to go. The STC is set to 18*C and reads 21*C and the light is lit up next to "cool" on the display. Yet when I check voltage on the "cooling" hook up on the STC, flatline, nada, nothing , zero. Not cool. I can't figure this out. I hooked it up the most direct and easy way I could and nothing. HELP PLEASE

 

[day_trippr]

[edit] Turns out "nothing" is in the eye of the beholder.

There is an anti-short-cycle delay that I think defaults to non-zero time. You might just have to wait ten minutes for the load to kick on...

Cheers!

 

[amandley]

Are you sure you received a 110 vac model? It's not uncommon for folks to end up with 220 vac (aka "international") units through any number of potential errors, from order to fulfillment...

Cheers!

Umm, I guess not. I made sure I ordered the 110. Is there somewhere specific that I can check on it to make sure?

 

[trujunglist]

The default compressor delay is 3 minutes. You have to wait that amount of time before the freezer will kick on. If everything is wired correctly and you didn't change the default for that then all you need to do is wait. If that doesn't work, maybe you got a bad unit.

edit: You should check a wiring diagram to make sure you got it right, because you need a hot into the cooling part of the unit. Based upon your description I'm not sure you got that right. You need some power to the cooling portion (hot to #7), but it sounds like you're running 7 and 8 to the outlet. I just built one of these myself and used one of the diagrams around here.

 

[amandley]

Ya, waited the 3 minutes, until the indicator light stopped blinking. Also, changed the setting to 27* C to see if the heat would work, no luck. No power being delivered. Power in, no power out, om either port. Also checked the settings, all are on default besides set temp.

 

[amandley]

And, according to the sticker on the unit, power supply is 110 ACV

 

[amandley]

[edit] Turns out "nothing" is in the eye of the beholder.

There is an anti-short-cycle delay that I think defaults to non-zero time. You might just have to wait ten minutes for the load to kick on...

Cheers!

wow, really? I cant find anything about that, but I dont think I have given it 10 minutes total, plugged in. I will go wire it back up and try again. I will just leave it plugged in for 30 and get back to you to let you know. Thanks

 

[trujunglist]

You should have a wire nut for the power cord hot and then hots to #1 and #7. Then you run #8 into the gold side of the outlet. Does that sound like what you've got going?

 

[amandley]

You should have a wire nut for the power cord hot and then hots to #1 and #7. Then you run #8 into the gold side of the outlet. Does that sound like what you've got going?

No, absolutely not. I just went straight in, both hot and neutral and straight out, both hot and neutral

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[trujunglist]

Yeah, that doesn't sound right to me. You should check a wiring diagram. There are some around here and you can also just google "stc 1000 wiring" and it'll show you a bunch of different ones so you can find one that suits your need. You need a wire nut for the power cord hot into #1 for the unit power, #5 for heat if you want that, and #7 for cooling. Then you run #6 for heat out to an outlet on the gold side and #8 out to an outlet on the gold side (or you can break the tab on one outlet and just have 1 socket for hot and 1 for cold).

 

[amandley]

ok. found a diagram on google images, rewired it. BAM it works. Apparently Im just an idiot

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[trujunglist]

ok. found a diagram on google images, rewired it. BAM it works. Apparently Im just an idiot

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Sweet! Congrats! It's really nerve wracking when things don't seem to go as planned. Your diagram seems kind of unique too, in that most people opt not to dedicate the fridge or freezer. I think it has some potential to help people understand the process a bit more. I am really not DIY inclined at all (got the wrong sized cord grip so my build is a little janky right now) so diagrams are essential.

 

[amandley]

Ya. I can handle building, and most mechanical work but electrical always confuses me.
Although the diagram I posted is for hardwiring, I just put the wires "to fridge" over to an outlet.

 

[MrFancyPlants]

First of all, thanks for the thread.. I ran into the same issue. However in my attempt to correct I ran a jumper between 1 and 7, and also between 2 and 8. It seemed to work for a bit but then started shorting and flipping the circuit breaker. I looked again at the second diagram and I think I was incorrect to connect 2 and 8. Hopefully I didn't fry the thing, but I'll remove the 2,8 jumper and report back.

 

[doug293cz]

First of all, thanks for the thread.. I ran into the same issue. However in my attempt to correct I ran a jumper between 1 and 7, and also between 2 and 8. It seemed to work for a bit but then started shorting and flipping the circuit breaker. I looked again at the second diagram and I think I was incorrect to connect 2 and 8. Hopefully I didn't fry the thing, but I'll remove the 2,8 jumper and report back.

There is a relay contact between pins 7 & 8. If you jumpered 1 to 7 and also 7 & 8, then whenever the STC-1000 calls for cooling, the relay closes which shorts power to neutral, and pop goes the breaker. The current from shorting power to neutral very likely damaged the relay in the STC-1000 as they are only rated for 10 or 15 amps (depending on version of STC-1000.) If it were me, I'd replace the STC.

Brew on

 

[MrFancyPlants]

I jumpered 2 and 8, not 7 and 8. I think it was shorting when the cooling cycle ended and then sooner once it was fried. I haven't had a chance to try the fix.. Hopefully tomorrow.

 

[GilSwillBasementBrews]

First of all, thanks for the thread.. I ran into the same issue. However in my attempt to correct I ran a jumper between 1 and 7, and also between 2 and 8. It seemed to work for a bit but then started shorting and flipping the circuit breaker. I looked again at the second diagram and I think I was incorrect to connect 2 and 8. Hopefully I didn't fry the thing, but I'll remove the 2,8 jumper and report back.

Yeah you want to remove the jumper between 2&8 just think as the in then out ports on 7&8 on the diagram as a light switch. Your only making a break in a single wire. Hope you didn't get your unit fried due to reasons mentioned above. Nobody likes fried units.

 

[day_trippr]

 

[MrFancyPlants]

Second time is a charm, now I'll just wrap some duct tape around it and..