Additional Connections For Evacuation; Capacity Control And Start Unloading; Electrical Connection; Mains Connections - Biber OSKA9563 Instructions De Service

Connection positions
9 Threaded bore for pipe fixture (ECO and LI
lines)
10 Maintenance connection for oil filter
11 Oil drain (oil filter)
12 Monitoring of oil stop valve
OS.85: Monitoring of rotation direction and
oil stop valve
13 Oil filter monitoring
14 Oil flow switch
OS.95: Oil level monitoring
15 Earth screw for housing
16 Oil drain (oil filter chamber)
17 Maintenance connection for shaft seal
18 Liquid injection (LI)
19 Compressor monitoring module
(CM-SW-01)
20 Slider position indicator
SL Suction gas line
DL Discharge gas line
Tab. 1: Connection positions
Dimensions (if specified) may have tolerances accord-
ing to EN ISO 13920-B.
The legend applies to all open and semi-hermetic
BITZER screw compressors and contains connection
positions that do not occur in every compressor series.
4.5.1

Additional connections for evacuation

In case of a great system volume, install generously
sized, lockable additional connections on the pressure
and suction side. Sections locked by check valves must
have separate connections.
4.5.2

Capacity control and start unloading

The OS.A95 compressors are equipped with an "infinite
capacity control" (slide control). The compressor control
module controls the solenoid valves.
For the detailed descriptions of the capacity control,
see Technical Information ST-150.
For the start unloading, the compressor control module
sets the capacity slider to the minimum displacement.
For this, a time period of approx. 5 min in the system
control must be provided.
SB-520-1

5 Electrical connection

NOTICE
!
!
Risk of short-circuit due to condensation water
in the terminal box!
Use only standardised cable bushings.
When mounting, pay attention to proper sealing.
General information
Compressors and electrical equipment comply with the
EU Low Voltage Directives 2006/95/EC and 2014/35/
EU.
Connect mains cables, protective earth conductors and
other cables according to the description, see Tech-
nical Information ST-150. Observe the safety standards
EN 60204, IEC 60364 and national safety regulations.

5.1 Mains connections

When dimensioning motor contactors, feed lines and
fuses:
• Use the maximum operating current or maximum
power consumption of the motor as a basis.
• Select the contacts according to the operational cat-
egory AC3.
Compare the voltage and frequency specifications on
the motor type plate with the data of the mains supply.
The motor may be connected only if the values match.
Wire the terminals according to the instructions of the
motor manufacturer.
NOTICE
!
!
Risk of compressor failure!
Operate the compressor only in the intended ro-
tation direction!

5.2 Safety and protection devices

5.2.1

Compressor control module

The compressor control module monitors the essential
operating parameters and protects the compressor
from operation under critical conditions, see Technical
Information ST-150.
5.2.2

Motor safety and protection devices

Provide motor safety and protection devices according
to the regulations of the motor manufacturer or the dir-
ectives on the protection of drive motors.
9