Hanbell RC2-100AF, Manual

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Bad suction header design when suction header runs above the compressors
For oil separator, discharge gas and oil lines, the design concept is to ensure the compressor not being flooded
with oil or liquid refrigerant during standstill because such a situation will lead to uncontrollable hydraulic
pressures during start-up and in some cases comes to the bearings failure. For the safest arrangement, we
recommend installing oil separator where the oil level is below the compressor outlet with inclining discharge gas
line (> 1 cm per m). This design can ensure no oil flows back to the compressor during standstill.
Discharge gas line design when oil level in oil separator below the compressor level
Sometimes although the oil level in oil separator is below the compressor level, the inlet port of oil separator might
above the compressor
’s discharge port. In this kind of situation, the discharge gas line should initially run
downwards, so the oil or liquid refrigerant won
’t be accumulated in the compressor after the compressor stops.