I recently installed a 2 ton, which was sized as, and am having a difficult time getting the space to cool down past 74.
Long story short, air handler is in attic, condenser at ground level. air handler is txv, r-22, has sight glass and drier. i have tried to charge via sight glass, by feel of suction line, and superheat/subcooling (not efficient in either). i do not believe there is a receiver in unit.
I once had same scenario a while back turned out was overcharged as i charged by sight glass.
Thanks for the advise,