16
AGL_Ref_ST_YBK1E_EN_Rev01
Figure 12: Oil dilution chart (tb = bottom shell temperature; te = evaporating temperature) and position for oil
temperature sensor
3.16 Suction line accumulator
Due to Copeland scroll’s inherent ability to handle liquid refrigerant, for example in flooded start and
def rost cycle operation, an accumulator is not required in most systems.
To determine if a suction line accumulator is required, the system designer must check this with an
appropriate test scenario. See
section 3.15
"Compressor oil return, oil balancing, floodback and
.
If an accumulator is used, the oil-return orifice should be from 1 to 1.4 mm in diameter for all YB*K1E
models depending on compressor size and compressor floodback results. To protect this small orifice
f rom 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 f ine 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 ref rigerant control. For the correct selection and size of the suction line
accumulator, refer to the manufacturer’s specifications.
