Originally Posted by OatStraw
So I have mine set at 40* and the Diff set to 2*, but I will see it turn off at 38 yet a couple minutes later it reads 35*. I have the probe just hanging in the freezer. Is there that much of a delay that the temperature actual cools an additional 3* before it registers?
Also opened up the A419 to set to Cut-Out mode but there is only 2 Jumpers in there. 1 is on the Touchpad lock, and the other is on Jump 1. Based on the diagram in the manual I need 2 jumpers to make it operate in Cut-Out mode. Did you have to provide your own jumper?
The air temperature will go less than the setpoint because the cooling coils are still colder than 38F when the controller shuts the freezer off. The contents of the freezer will pull the air temperature back up pretty quickly. There is no delay in the temperature probe. This is the reason to use a big Differential when the probe is in the air. You can also insulate over the the probe on the side of a bottle/keg/carboy and the temperature will not go more then 1F then what you expect and you can use a smaller Differential without over cycling the freezer.
Are you circulating the air inside the freezer with a fan (12V computer fan)? If not, that may help keep the temperature more uniform.
Mine came with all 3 jumpers. You're ok with 2 as long as you understand how the Differential will be applied to the Setpoint. You can probably email Johnson Controller customer service and get a free replacement jumper.