Another Fermentation Chiller Wiring Questions Thread...

MetallHed said:

I'm in the process of building a mother of fermentation chiller, but have little experience as an electrition.

I looking at getting a 12VDC fan and the RiteTemp 8099 thermostat. Now as far as a wall wort, I'm going to need a 12VDC, correct?

The thing I'm having trouble with is understanding if these will be compatable. It is my understanding that all you are doing with the thermostat is creating a relay for the ground wire of the fan. When the temp rises above its set point, the stat connects the relay points and the circuit is complete, thus allowing the fan to run. Correct me if I'm wrong.

The thermostat runs on two AA batteries at 24VAC. I know that this does not supply power to the fan at all, but wouldn't the ENTIRE circuit need to be DC for it to be complete?

Will these components work together at all?

My other idea was that I have a very small fan that plugs into the wall that I could hook up to a fan switch, set on low, and have continuous circulation of air, and adjust the ice quantity to keep the temp at a certain level.

What do you think? I need to hear from someone that has actually done this or knows more about electric troubleshooting.

Thanks!

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The thermostat runs on two AA batteries at 24VAC.

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Bjornbrewer said:

Yes, you need a 12vdc wallwort.

The relay works pretty much how you said, except the relay contact will make and break the hot side (+) of the circuit, not the ground.

The thermostat runs on 24vac, the batteries are there so if you lose power you wont lose your settings.

As far as one being 24Vac and the other being 12Vdc, not a problem. Relays isolate voltages, so you can have it controled by one voltage (in this case 24vac) and have the contact make and break an completely different voltage (in this case the 12vdc).

hope this helps.

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