Emerson Copeland YB56K1G Application Manuallines page 21

If an accumulator is used, the oil-return orifice should be from 1 to 1.4 mm in diameter for all YB*K1G
models depending on compressor size and compressor floodback results. To protect this small orifice
from plugging with system debris a large-area protective screen no finer than 30 x 30 mesh (0.6 mm
openings) is required. Tests have shown that a small screen with a fine mesh can easily become
plugged causing oil starvation to the compressor bearings.
The size of the accumulator depends upon the operating range of the system and the amount of sub-
cooling and subsequent head pressure allowed by the refrigerant control. For the correct selection
and size of the suction line accumulator, refer to the manufacturer's specifications.
16 AGL_Ref_ST_YBK1G_EN_Rev01