re: Home Improvement(dont trust the OT) Board.....A/C trouble

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ok, I know nothing. Can you think of anything else that is specific to the type of freon that involves the coil. He specifically said that the new coil would have a pump/piston/thingamajig that needed to be converted to 22. I may have used the incorrect term. Is there another part that would need to be freon type specific? Thanks. Remember, talk to me like a 7 year old.

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Ahh, much better. Sorry, I didn't mean to be an arse originally, it just chaps my hide when people are about to be ripped off, kinda like the blinker fluid thing.

Anyway, yes you will have to have a new piston for the coil else the evaporator will either have too much or too little refrigerant entering it.
The piston, which isn't a piston and it doesn't move, is nothing more than a fixed metering device. If anyone is interested I would be happy to give a short and sweet answers about how A/C systems function, on a seven year old level of course.

Your guy told you the straight of it even though it wasn't important to mention to you. His price is very good for a five ton coil change, fact is, that is a good price for a three ton coil.

Just be sure he installs a new drier at the outdoor section and all will be good.