Installing Johnson Contols Digital Thermostat (HELP!!!)

OK fellow beer knerds, I bought two chest freezers last weekend and I need some assistance with the thermostats. One was converted with the wood collar into a kegerator. The other I was trying to use as a fermentation chiller. I finally finished, got my thermostats in the mail yesterday and have atempted to install them and...

Epic instructions fail.

I'm not an HVAC specialist so reading portions of the instructions has proven a challenge when it comes to terminology.

I have figured out how to set the temp: 42 on the kegerator and 68 on the ferm chiller. Sensor's are hanging in free air in the middle of the freezers via the baskets. I have the diferential set to 2 degrees. The kegerator is fairly acurate, but kind of cold. Sits at 39 degrees according to the thermostat. The fermentation chiller is WAY too cold, sitting at 59-60. Both are set to the coldest settings on the freezer dials (I caught that on a previous thread).

Who has mastered their Johnson...controls digital thermostat? Help a fellow knerd out, what am I missing? How can I get it more accurate?

Thanks for the assist! :rockin:

Tape the probe to the outside of your fermentation vessel so the temperature is read from the fermenting wort instead of the air in the kegorator. I also put insulation over the taped on probe to further shield it from air in the kegorator. Also did you wire it correctly, because mine reads exactly what I set it to. It kinda sounds like its not working...

I'll def try the taping thing. I would chalk it up t a defective part, but there's two of them so Im assuming it must be user error and something Im not doing correctly.

Here's a diagram someone made to wire the controller if it helps...