Bitzer ST-140-2 Mode D'emploi page 50

4 Connections at the compressor
Information
Observe tightening torques for screw connections according to maintenance instructions SW-100 !
HS.95 and OS.A95: additional oil injection
In order to be able to control the oil circulation rate independently of the pressure difference, HS.95 and OS.A95
compressors are equipped as standard with an additional bore with a set screw. If this is opened, the oil circulation
rate increases, thus allowing a higher oil injection temperature for the same refrigerating capacity - with slightly re-
duced compressor efficiency.
When operating at high condensing and low evaporation temperatures, above 50 Hz or 2900 min
injected at a very low temperature to control the discharge gas temperature to 80°C (standard). Alternatively, to op-
erate the compressor under these conditions with higher oil injection temperatures, the oil volume flow can be in-
creased. For this purpose an additional oil injection into the profiles must be opened.
WARNING
The system is under pressure!
Serious injuries are possible.
Wear safety goggles!
For this purpose
▶ depressurise the compressor,
▶ unscrew plug (see illustrations below),
▶ remove the set screw behind it,
▶ reinstall plug with new aluminium gasket ring,
▶ test tightness.
Fig. 8: Side view OS.A9593 .. OS.A95103, the red outline indicates the additional bore with a set screw (corresponds to entry 24 in the dimen-
sional drawing, see Operating instructions SB-520 or BITZER SOFTWARE).
ST-140-2 // PDF Download
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the oil must be
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