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Old 09-19-2012, 04:58 PM   #221
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Pop the case off the STC-1000 and look at the relays. Mine are rated for 15A @ 125V. Thus, I would feel comfortable putting a startup current of 12A through them, but certainly not a constant current.


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Old 01-08-2013, 01:58 PM   #222
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Let me see if I've got the functionality of this device straight.

Cooling mode - set a target value, and a difference value (between 0.3 and 10C), it's been AT or ABOVE the target plus the difference value for the compressor delay (up to 10 minutes), it will turn on the cooling circuit and leave it open until the temperature is at the setpoint. Then it will turn off.

Example: set to 25C with a difference of 4 and compressor delay of 4. Once it's been 29C for 4 minutes, the cooling circuit will activate until the temperature reaches 25C.


Heating mode - set target and difference as above--there's NO compressor delay function available. Once the actual value reaches the target minus the difference, the circuit immediately opens and stays on until the target value is reached.

Example: set to 25C with a difference of 4. Once it reaches 21C the heating circuit will activate until the temperature reaches 25C.


If both heating and cooling devices are plugged in to the same controller, then there can still only be one setpoint and one difference value. If you wanted two targets or two difference values, then you'd need two controllers.

Have I got all this correct? Was there ever an answer to the several folks wondering the maximum heat the temperature probe could accept? Can it mash--can it sparge? Heck, can it boil / bake w/your malt...?


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Old 01-08-2013, 02:08 PM   #223
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As per this., it measures 0C-99C (210F).

You're correct that the compressor delay is only on the cold side.

The temperature swing is, I *believe*, "+/-" , in that if you set the temperature target for 20.0C, with a swing of 2C, it will turn on the cold relay at 22C (and will wait for the compressor delay), and will turn it off at 20C.

Likewise, if the temp is set for 20.0C with a swing of 2C, it will turn on the heat when the temp falls down to 18.0C (and no delay on that one) and will stop when the temp reaches 20.0C.

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Old 01-08-2013, 06:05 PM   #224
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As per this., it measures 0C-99C (210F).

You're correct that the compressor delay is only on the cold side.

The temperature swing is, I *believe*, "+/-" , in that if you set the temperature target for 20.0C, with a swing of 2C, it will turn on the cold relay at 22C (and will wait for the compressor delay), and will turn it off at 20C.

Likewise, if the temp is set for 20.0C with a swing of 2C, it will turn on the heat when the temp falls down to 18.0C (and no delay on that one) and will stop when the temp reaches 20.0C.

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Does the controller wait for the delay every time? Or is it smart enough to know the delay time has passed, if it indeed has? I would hope for second case to be the true one. I have one of these builds (not the Walmart parts version though) and it works very well. I use a 0.3C swing with my probe taped to the fermenter and pretty well insulated with pipe insulation tape and reflectix. This is heating season here, but sometimes it gets warm enough that it needs to cool. It is so nice not having to worry about this at all.
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Old 01-08-2013, 06:12 PM   #225
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Does the controller wait for the delay every time? Or is it smart enough to know the delay time has passed, if it indeed has? I would hope for second case to be the true one. I have one of these builds (not the Walmart parts version though) and it works very well. I use a 0.3C swing with my probe taped to the fermenter and pretty well insulated with pipe insulation tape and reflectix. This is heating season here, but sometimes it gets warm enough that it needs to cool. It is so nice not having to worry about this at all.
The compressor delay will only activate when the cooling relay has been closed recently, and when the unit powers on.
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Old 01-08-2013, 06:19 PM   #226
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The compressor delay will only activate when the cooling relay has been closed recently, and when the unit powers on.
I wasn't aware of that. Thanks for pointing it out.

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Old 01-08-2013, 06:37 PM   #227
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I wasn't aware of that. Thanks for pointing it out.

MC
What I'm not sure of is whether the delay starts from the time the compressor was last activated, or from the time the temp reaches the set-point. Not that it really matters.
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Old 01-08-2013, 06:46 PM   #228
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What I'm not sure of is whether the delay starts from the time the compressor was last activated, or from the time the temp reaches the set-point. Not that it really matters.
Pretty sure it's from the time it reaches the setpoint....I've tried turning it down after reaching the setpoint (after running for more than 10 mins) and it still delays.

I.e., it won't power the compressor until waiting x amount of time since it last provided power to it, giving it a chance to equilibrate.
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Old 02-06-2013, 04:44 AM   #229
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After setting everything up and getting the bugs worked out, I've realized that I don't like the stc-1000 probe going thought the door seal. Maybe doesn't have much effect but bothers me. Does anyone have an opinion regarding the +/- 10 degrees calibration ability after setting up some kind of "through the door jack" system? Is the adjustment wide enough to bring back into calibration? Maybe earphone jack and plug both inside and out for neatness.
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Old 02-06-2013, 05:06 AM   #230
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After setting everything up and getting the bugs worked out, I've realized that I don't like the stc-1000 probe going thought the door seal. Maybe doesn't have much effect but bothers me. Does anyone have an opinion regarding the +/- 10 degrees calibration ability after setting up some kind of "through the door jack" system? Is the adjustment wide enough to bring back into calibration? Maybe earphone jack and plug both inside and out for neatness.
Adding a couple jacks shouldn't change the reading much if at all. I doubled the probe wire length and added jacks to two controllers, and one of them didn't even need to be re-calibrated. The other one only needed to be adjusted 1F.


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