Your existing TStat is mechanical, not electronic, thus it does not have 12VDC input. Your new electronic TSTAT will not be located i the fridge/freezer. You'll need DC power from the compressor unit to the TSTAT, you'll need a temp sensor from the fridge/freezer to the TSTAT. And you'll need to redirect the two control wires from the old mechanical Tstat to the new digital one. Drill the fridge/freezer, pull the temp sensor, then seal with duct seal compound (grey putty available at home depot).
Did you review the manual and associated wiring diagram I posted above? It has several examples of electronic thermostat wiring....
Do you have the spillover fan option in your existing install? If so, you'll have to make sure that wiring is maintained.
Is there a resistor between the yellow wire and the red spade connector? Resistors are covered in the installation manual.... this may have been a modification by the previous owner, so you may have to assess your install prior to proceeding.
Why not just replace with a mechanical unit though? They are super reliable from a mechanical standpoint and relatively cheap.
www.rparts.com
