2. GEA Refrigeration Technologies2 Semi-hermetic Bock Compressors
HG and HA Series
Suction gas-cooled semi-hermetic
compressor
Air-cooled semi-hermetic compressor
for low temperature applications
13. GEA Refrigeration Technologies
In operation with Heat Exchanger
and obtained Subcooling Δtch= 50 K,
you can reach >40% more efficiency!
Evaporating Temperature °C
SubcoolingTemperature°C
exitheatexchanger
Diagram to determine subcooling temperature
on exit heat exchanger
6-cylinder two-stage compressor HGZ7
14. GEA Refrigeration Technologies
6-cylinder two-stage compressor HGZ7
Highlights HGZ7 series:
• 6-cylinder compressor
• 3 capacity stages:
HGZ7/2110 HP 61,2 / LP 122,4 m3/h (50Hz)
HGZ7/1860 HP 53,8 / LP 107,6 m3/h
HGZ7/1620 HP 46,9 / LP 93,7 m3/h
• Part Winding Motor
• Refrigerant R404; R410A; R22
15. GEA Refrigeration Technologies15 Semi-hermetic Bock Compressors
8-cylinder compressors
Highlights HG8 series:
• 8-cylinder compressors
• 3 capacity stages: 214,3 m³/h
245,9 m³/h 50 Hz
279,8 m³/h
• Part winding motor
• Common casing for compressor and motor
• Capacity control with
• Bock Electronic Frequency Control (EFC)
• Mechanical capacity unloader (33/66%) (
16. GEA Refrigeration Technologies16 Semi-hermetic Bock Compressors
Special Features: Wear-resistant durable driving gear
Pluscom 2- and 4-cylinder compressors
• Solid construction and design
• Low friction sleeve bearings
• Aluminium pistons with two ring assembly
4-, 6- and 8-cylinder compressors
• Solid construction and design
• Low friction sleeve bearings
• Surface-hardened crankshaft
• Aluminium pistons with triple ring assembly,
HG(HA)4 with double ring assembly
• Aluminium connecting rod with high
resistance piston bolt bearings starting
HG(HA)5
17. GEA Refrigeration Technologies17 Semi-hermetic Bock Compressors
Special features: Solid construction and design
HG(HA)5-6
HG7-8
• Valve made of high quality impact-resistant
spring steel
• Concentric reed valve on the suction side 2
HG(HA)12-34
HG(HA)4
• Valve made of high quality impact-resistant
spring steel
• Finger reed valve 1
1 2
18. GEA Refrigeration Technologies
Special features: Safe, reliable oil supply
• Lubricating system with oil pump independent of rotation direction
• Large volume oil sump
Semi-hermetic Bock Compressors18
19. GEA Refrigeration Technologies19 Semi-hermetic Bock Compressors
Special Features: Variable suction line valve position (HG)
2- and 4-cylinder 6- and 8-cylinder
• Shutoff valve rotates through 90° (2 and 4 cylinder), suction cover rotates through 90° (8-cylinder)
• Flexible location for suction line connection
20. GEA Refrigeration Technologies20 Semi-hermetic Bock Compressors
Special features: Oil sump heater
• Standard in 4-, 6- and 8-cylinder compressors
HG(HA)4 up to HG8
• Immersion case design
• Replacement possible without opening the
refrigerating circuit
• Optional in 2- and 4-cylinder compressors
HG(HA)12 up to HG(HA)34
• PTC heater, self-regulating
• Replacement without opening the refrigeration
circuit
21. GEA Refrigeration Technologies
• Easy electrical installation due to large internal
volume
• Terminal block with cables in glass seal model
• Hinged lifting cover with a single quick fastener
(6-cylinder)
• Cover with simple snap closure (8-cylinder)
• Inspection window for compressor monitoring
(8-cylinder)
• Protection system: 4-cylinder IP65; 6- and 8-
cylinder IP54
• Robust aluminium construction
• Easy electrical installation due to large
internal volume
• Terminal block with cables in glass seal
model
• Hinged and removable lifting cover
with a single quick fastener
• Terminal strip for add-on components
• Protection system: IP66
2
21 Semi-hermetic Bock Compressors
Special Features: Electrical switch box
1
1
2
22. GEA Refrigeration Technologies22 Semi-hermetic Bock Compressors
Bock MP10 Electronic Motor
Protection
Special Features
Bock Compressor Management
BCM2000
• Standard with all compressors
• Temperature monitoring with PTC sensors
and optical status indicators
• Discharge gas temperature sensor
(option)
• Innovative and advanced compressor
management system
• Optional for 4-, 6- and 8-cylinder
compressors
23. GEA Refrigeration Technologies23 Semi-hermetic Bock Compressors
Via frequency converter
Continuously variable speed control using the
Bock EFC / EFCe
(Electronic Frequency Control)
Up to 25% less power consumption
EFC Continuously variable speed control
directly mounted on the compressor
HG(HA)12 to HG(HA)34
Special features: Efficient capacity control (option)
2
Via capacity regulator
Cylinder cover incorporating a connection for
capacity control
Possible control stages:
• 4-cylinder: 50 %,
• 6-cylinder: 33 % / 66 %,
• 8-cylinder: 25 % / 50 % / 75 %
1
1
2
24. GEA Refrigeration Technologies
Product summary HG12 – HG8
8 model sizes with 26 capacity stages
in 2-, 4-, 6- and 8-cylinder design with swept volumes from 5,4 up to 279,8 m3/h [50 Hz]
25. GEA Refrigeration Technologies
Product summary HA12 – HA6
6 model sizes with 20 capacity stages
in 2-, 4- and 6-cylinder design with swept volumes from 5,4 up to 122,4 m3/h [50 Hz]
Semi-hermetic Bock Compressors25
26. GEA Refrigeration Technologies
Semi-hermetic compressor types
26 Semi-hermetic Bock Compressors
CO2 subcritical CO2 transcritical
One-stage
compressors
R407C up to 35 bar
ATEX Version HC Version for
Hydrocarbons
Aluminium Version 2-pole motor design
Two-stage
compressors
Duplex Condensing /
receiver units
28. GEA Refrigeration Technologies
Additional accessories
Oil temperature
control
Water-cooled cylinder
covers
Additional fan
Connection piece in
welded construction
Intermediate adapter
for discharge line valve
Semi-hermetic Bock Compressors28