For HS. and OS. compressors the following is additionally necessary:
• check valve after the oil separator
• pressure equalisation line between oil separator and suction gas line
– Ø 6 mm - 1/4''
– controlled by solenoid valve
– only open at standstill - with parallel compounding, the solenoid valve may only be open when all com-
pressors are switched off
External oil pump
An external oil pump is necessary in systems where no sufficient oil differential pressure can build up directly after
the compressor start, e.g:
• in large parallel compound systems with temporarily low condensation temperature, e.g. in winter
• or for boosters with low pressure differences
For such applications, a special version without oil stop valve has been developed for the compressors HSKB85,
OSKB85 and OSKAB85. In addition, a solenoid valve is included in the scope of delivery, which must be installed
in the oil line.
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Basic version: oil cooler below compressor level
Integrate the oil cooler according to the following illustrations. Make sure that the oil cooler is located below the in-
jection point on the compressor.
Temperature control
• for air cooled oil coolers by thermostatic switching on and off or stepless variable speed control of the cooler fan
• for water cooled oil coolers by thermostatic flow regulating valve
• In oil coolers which are integrated in the condenser, the oil mixing valve simultaneously controls the temperat-
ure.
Setting temperatures: Thermostatic control of the oil cooler . Also observe the maximum sensor temperature!
ST-140-3 // PDF Download
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