Accessories; Capacity Regulation - GEA Bock EX-HG88e Series Assembly Instructions Manual

8| Accessories

8.1 Capacity regulation

INFO
By a capacity regulation, the compressor capacity can be reduced by switching off up to three cylinder
banks by 25 % each (in relation to maximum power). It is necessary to replace the respective cylinder
cover (included in the kit) for retrofitting.
Retrofit kits:
EX-HG88e / ...
Designation
Kit Capacity regulator
with cylinder cover
230 V AC
Kit Capacity regulator
with cylinder cover HC
230 V AC
INFO
The explosion-protected magnetic coil for LR 12 is available in the Ex e mb design (encapsulation,
increased safety). The electrical wiring within the explosion risk area has to be carried out via a separate
terminal box that is designed in an approved ignition protection type M22 x 1.5 (e.g. Ex e).
For the installation, use heat-resistant lines with a temperature resistance of at least 140 °C.
Wiring of the magnetic coil has to be static and mechanically protected.
During assembly and installation, the requirements of EN 60079-14 and the EN 60079-17 have to
be observed. In addition, national laws, instructions (BetrSichV) or regulations have to be observed.
Additional installation instructions and installation/deinstallation instructions can be obtained from
the accompanying kit documentation.
Terminal cross-section of magnetic coil: 3 x 1.5 - 4 mm
Clamping range cable screw connections (metal): 5 - 8 mm.
Clamping range cable screw connections (plastic): 6 - 12 mm.
Using the Norgren magnetic coil, ID no. 4280/4281 (GEA part no.
70123, 70124, 70125, 70149) effectively reduces the permissible
ambient temperature of the compressor to (−20 °C)–(+50 °C).
Observe the type plate on the magnetic coil.
2400-4 (S) 3G
Item No.
81648
81801
The gas velocities and pressure conditions of the refrigerat-
ing plant change in operation with capacity regulation: Adapt
the suction line run and dimensioning correspondingly, do not
set control intervals too closely (steady state condition of the
refrigeration plant must be reached), continuous operation in
the control stage is not recommended (uneconomical).
Electrical control of the solenoid valve: Opened de-energized
(corresponds to 100 % compressor output).
2735-4 (S) 3G
Item No.
81646
81802
.
2
3235-4(S) 3G
Item No.
81644
81803
37
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