I am getting ready to brew next weekend and I have a chest freezer that I want to use for fermentation for the first time. I just bought a new Johnson A419 and it's all wired up and ready to go. But I have a question on it before plugging it in and trying it out before I brew. It comes with factory settings for cooling (jumpers). I want to set it at 68F. Do I change the jumpers in it for heating mode cut-in at setpoint, heating mode at cut-out or leave it at cooling cut-in? Also, do I need to do anything else to the freezer when I plug in the A419? Thank you.