I am not fimiliar with the unit but basically you are turning on a compresor. I speculate their is a 12v switch AKA relay that is normally open and closes when system meets the criteria, probable a switch that closes when a certain temp is acheived
All you sould have to do is take those out of the loop, All you need to do is find where the 120v starts, it will then have a start and run capacitor in the loop
Bug a switch in where the curcuit starts at the 12v switch and you should be in, being retial it may have a bunch of safty stuff as well. If not fimilir with electrical curcuits you may want to take it to a local refrigeration company and have them do it for you
best of luck and from Scott's post he may be fimiliar with this unit and have an easier solution
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