It doesn't go on Schedule E at all, it goes on form 4797.
The fridge should have been depreciated, over 5 years. If you sold it after 5 years, all the proceeds are taxable income taxed as depreciation recapture (25% rate) up to the allowable depreciation (your original cost basis), above which it is taxable capital gain. Whether you actually have depreciated it or not, it is really your problem, IRS doesn't care. So if 5 years of ownership passed - just write it all as taxable income on the form 4797. Otherwise, allowable depreciation prorated (and you can still amend forms 3 years back to get at least part of it).
The new fridge should also be depreciated over the 5 years of its expected useful life. See form 4562.
Talk to a licensed tax professional (EA/CPA licensed in your state) for details.