Suction Line Accumulator - Emerson Copeland YRH KTE Series Application Manuallines

3.12 Suction line accumulator

Due to Copeland scroll's inherent ability to handle liquid refrigerant, for example in rare flooded start
operation, an accumulator is not required in most systems.
The system designer must determine if a suction line accumulator is required with an appropriate
test scenario. See section 3.11 "Compressor oil return, oil balancing, refrigerant floodback and
oil dilution tests".
If an accumulator is used, the oil-return orifice should be from 1 to 1.4 mm in diameter for all
YRH(V)*KTE/KTG models based 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.
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