HS./OS. compressors with HFC or HFO refrigerants

Oil circuit for oil cooling with HFC or HFO refrigerants: Variant with air cooled oil cooler which is placed significantly higher than the compressor. Here a check valve and a differential pressure valve are necessary in the oil line. Hypothetical example with 3 different HS./OS. compressors in order to show the different equipment.

Legend
1	Compressor
2	Check valve, discharge gas connection
3	Discharge gas line to the oil separator installation with inclination
4	Oil separator
5	Oil cooler
6	Oil line, primary oil circuit
7	Oil mixing valve, primary oil circuit
8	Filter, primary oil circuit
9	Solenoid valve, primary oil circuit (for OS.A105: 2 valves in parallel)
10	Oil line, secondary oil circuit
11	Solenoid valve, secondary oil circuit
12	Check valve and/or pressure control valve, discharge gas line
13	Discharge gas line to the condenser
14	R717 suction gas line, dry. Installation with upward inclination
15	Shut-off valve
16	Maintenance valve
17	Oil flow switch
18	Sight glass (if installed)
19	Oil pump
20	Oil check valve
21	Oil pressure relief valve
22	Refrigerant suction gas line, with oil return from the evaporator(s). Installation suction header horizontally
23	Pressure relief valve, necesssary in combination with check valve
24	(Evaporation) condenser
25	Liquid line, Installation with upward inclination
26	Refrigerant return line, wet Installation with upward inclination
27	Refrigerant return line, dry Installation with upward inclination
28	Thermosiphon receiver

Legend includes entries that are not used in all diagrams.