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

Arrangement of oil separator, discharge gas line and oil injection line with oil level in the oil separator above 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 **above 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)

This arrangement should only be selected in exceptional cases and only for systems with single compressors. An important prerequisite for a largely reliable system is that the oil line is raised to the upper edge of the sight glass. In addition, the discharge gas line – as in the version with oil level below the injection point at the compressor – must first be led downwards.