Electrical Connection; Mains Connections; Motor Version - Bitzer HS.8551 Instructions De Service

Connection positions
7c Oil drain hose (shaft seal)
8 Threaded bore for foot fastening
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
15 Earth screw for housing
16 Pressure blow-off (oil filter chamber)
17 Maintenance connection for shaft seal
18 Liquid injection (LI)
19 Compressor module
20 Slider position indicator
21 Oil level switch
22 Oil pressure transmitter
SL Suction gas line
DL Discharge gas line
Tab. 6: Connection positions
Dimensions (if specified) may have tolerances accord-
ing to EN ISO13920-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.

5 Electrical connection

Compressors and electrical equipment comply with the
EU Low Voltage Directive 2014/35/EU.
Connect mains cables, protective earth conductors and
other cables according to the description, see Tech-
nical Information ST-150. Observe EN60204-1, the
safety standard series IEC60364 and national safety
regulations.
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.
14
NOTICE
!
!
Risk of motor damage!
Improper electrical connection or compressor
operation at incorrect voltage or frequency may
lead to motor overload.
Observe the specifications on the name plate.
Connect properly and check the connections for
tight fitting.
DANGER
High electrostatic discharge voltage possible.
Risk of electric shock!
Also earth the compressor housing!
Heating the terminal box
For critical applications (low-temperature applications)
and, in particular, for environments with high air humid-
ity, the terminal box may require heating. A heater can
be retrofitted as an accessory.
Coating terminal plate and pins
During low-temperature applications with low suction
gas superheat, frost may form on the motor side and
partly also on the terminal box. To prevent voltage
flashovers due to moisture, we recommend coating the
terminal plate and terminal pins with contact grease
(e.g. Shell Vaseline 8401, contact grease 6432 or equi-
valent).

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.
• Set the thermal overload relays to the maximum op-
erating current of the compressor.

5.2 Motor version

Part winding motor
Compressors of the HS.85 series are equipped by de-
fault with part-winding motors ("PW") in Δ/ΔΔ-wiring.
Time delay until switch-on of the 2nd part winding: max.
0.5 s!
Make the connections correctly! Wrong electrical con-
nections will lead to opposite fields of rotation or to
SB-110-3