Oil level in the oil separator below the injection point on the compressor

The arrangement in the following figure also offers a relatively good prerequisite for safe operation.

Arrangement of oil separator, discharge gas line and oil injection line with oil level in the oil separator below the injection point on the compressor (here without oil cooler). The picture shows an HS. compressor, but applies analogously to OS. compressors. For OS.A compressors with R717 (ammonia), see Technical Information AT-640.1: Standstill bypass2: Pulsation muffler (if required) — Arrangement of oil separator, discharge gas line and oil injection line with oil level in the oil separator **below the injection point on the compressor** (here without oil cooler). The picture shows an HS. compressor, but applies analogously to OS. compressors. For OS.A compressors with R717 (ammonia), see Technical Information AT-640.
1: Standstill bypass
2: Pulsation muffler (if required)

The oil level in the oil separator is lower here than the injection point on the compressor, which also prevents oil flooding during pressure equalisation. However, it is imperative that the discharge gas line first leads downwards here so that no oil or liquid refrigerant accumulates in the pressure chamber of the compressor.