The Rcd that is tripping is either picking up an existing fault on the freezer or on the wiring itself, or the Rcd is faulty and is tripping for no reason. For this you would need and Rcd tester. My advice is to have a periodic inspection done on the existing installation, This will uncover any problems as to why this happens. You could also defrost the freezer and leave it unplugged for a couple of days, to see if the fault is on the freezer itself
Rob
January 2008