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Variant: oil cooler above compressor level
Usually the oil cooler should be located in the immediate vicinity of the compressor, preferably below the com-
pressor / oil separator ( Basic version: oil cooler below compressor level ). A design with the oil cooler above the
compressor should be limited to systems with relatively short shut-off periods: If the oil cooler is positioned consid-
erably high above the compressor (e.g. oil cooler on roof, compressor in machinery room), oil can flow back from
the oil cooler into the oil separator during standstill and be carried into the system during the subsequent com-
pressor start. Therefore, as an additional safety measure, install the following components in the oil line:
• check valve (with weak spring) (see entry no. 23 in legend below)
• bypass with differential pressure valve (Δp ca. 1,5 .. 2 bar)
7.1
HS./OS. compressors with HFC or HFO refrigerants
HS.53 .. 74
OS.53 .. 74
15
30°
1
2
15
Fig. 17: 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.
ST-140-2 // PDF Download
HS.85
OS.85
22
15
1
15
15
2
18
15
18
3
9
9
OSKB85
17
16
8
16
15
15
HS.95
15
1
15
2
15
18
9
21
16
16
8
16
15
TC
7
13
5
12
4
Booster
20
19
23
6
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