Thanks! I haven't been able to find any info on the rear unit...it was added by a previous owner. Actually, my A/C system just went out on me (compressor knocking bad) and the rear unit runs off of the same compressor so I am having to run without air until I can get it all figured out. I can possibly email you some pics of the unit and see if that helps you any...just send me your email address and I'll see what I can do. And nice 110, by the way!