A 1/4" line is definitely too small for a 3 ton unit to operate
properly. IMO, it s adequate for 2 ton max. The condensing unit has a
drier inside it, so I do not see the need for another one. Is it even a
heat pump drier? Look at it and see if it has an arrow indicating
direction. On a heat pump drier it should point both directions. If it
only points away from the cond. unit, it is not even the correct drier.
Two other points: The drier should be the last thing installed in the
refrigerant piping job, just before the vacuum pump is hooked up. Also,
squeezing a fitting down to fit a smaller tube is a very crappy way to
work. Just my .02 Larry