The cost of the appliances included in the sale of an Investment Property would increase your total basis in the entire property (and reduce any gain from the sale). It will amount to the same effect in the end. Please feel free to post any additional details or questions in the comment section.
To enter this sale, see the instructions below. Total basis is entered in Step 5.
as an example, if my cost for my refrigerator was $500 and it depreciated $100, then is my capital loss reported on form 4797 $400?
It's much easier, and generates the same result all around, to report a sales price of zero to each depreciated asset and enter the entire sales proceeds to the rental property itself. This is what you may have been alluding to in your original question. I hope this is helpful. Let me know.