the txv valve is a metering device which either increases the flow of refrigerant to the "a" coil or decreases it. by doing this it keeps the a coil from freezing up. so if you compare this to a garden hose, more water flows without a nozzle, but sprays with more force with a nozzle. this may work for you, i'm not sure. my 3-1/2 ton unit has 3/4" copper, so you may be good to go.
good luck, dan

i hope you live in canada. ge sourced out this washer from camco; it's a piece of junk. ge originally had problems with the transmission. being it's out of warranty, the TRADE price on the transmission is $79.95, and in stock. it comes out as a complete assembly. if the wife says trash it, consider going to www.staber.com and check out their product. this is the only brand of washer we sell. it's a commercial washer for domestic use. do not buy a neptune or frigidaire front loader. if interested in a staber, we can have one drop shipped in usa. any more questions...ask.
dan

Althogh this thread no longer resembles its original subject heading, i'm jumping in anyway.

twodan,
It is interesting what you say about the Neptune and Frigidaire. We just bought a Maytag last year and already had the tranny and tub brakes replaced on it under warranty. Damn thing still screams like a banshee when it comes to a halt. Since then it has also tore up some of our shirts (bad fin design). We plan on leaving it behind when we move.

I've passed the Staber link on to the wife.

Excellent. Thank you. A little bit more peace of mind now. I wanted to trust the repair guy, but he works for the company, y'know?