Some techs charge non-TEV systems by watching the
point suction line pressure starts increasing. As refrigerant
is added, the temperature of the suction line decreases, as
more refrigerant is added the temperature of the suction
line starts to increase because the suction pressure increases.
Some techs stop charging at this point. Is this a valid method
of charging non-TEV A/C split-systems? Probably not, but why not?