+James Yarbrough Good catch! It I waited until the last minute to remove the txv, and kept nitrogen flowing the entire time. I feel that protected the dryer but when the money is there dryers should always be changed.
+fvfgx Most manufactures have a "tech sheet" that shows the size piston required for their units but most are pretty close to the same size per ton and refrigerant type. Ralph Wolfe of T&N Services posted a chart on his Google Plus page a couple of times. Their are plenty of heat pump systems that use pistons both ways, but it would probably take some trail and error to get the pistons sized correctly in order to get your charge correct on both heat and cool! Thanks for watching.
Lol..i know man...i don't know if i could make videos, cause i just want to get the job done. That is why i appreciate you guys on here that take the time out to make them.