GEA Refrigeration Technologies
Single-stage and Two-stage
Reciprocating Compressors HG (HA)
Semi-hermetic Bock Compressors
GEA Refrigeration Technologies 2 Semi-hermetic Bock Compressors
HG and HA Series
Suction gas-cooled semi-hermetic
compressor
Air-cooled semi-hermetic compressor
for low temperature applications
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HG Series
HG-Principle – Suction gas-cooling of the drive motor
Semi-hermetic Bock Compressors 3
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HA Series
HA-Principle – Cooling of the drive motor with integrated ventilation unit
Semi-hermetic Bock Compressors 4
GEA Refrigeration Technologies 5 Semi-hermetic Bock Compressors
Highlights HG/HA 12 + 22 series:
• 2-cylinder design
• 7 capacity stages: 5,4 to 16,2 m³/h [50 Hz]
6,4 to 19,8 m³/h [60 Hz]
• Extended standard equipment
• Standard oil pump, motor protection system MP10
• Extremely compact
• Particularly low installation height and width
• Same footprints as competitor models
• Capacity control with Bock Electronic Frequency
Control (EFC)
• Start unloader with Bock Electronic Soft Start (ESS)
(
Pluscom 2-cylinder compressors
GEA Refrigeration Technologies 6 Semi-hermetic Bock Compressors
Pluscom 4-cylinder compressors
Highlights HG/HA 34 series:
• 4-cylinder design
• 4 capacity stages: 18,8 to 33,1 m³/h [50 Hz]
22,6 to 39,7 m³/h [60 Hz]
• Extended standard equipment
• Standard oil pump, motor protection system MP10
• Extremely compact
• Particularly low installation height and width
• Capacity control with
• Bock Electronic Frequency Control (EFC)
• Mechanical capacity unloader (50%) (
• Start unloader with Bock Electronic Soft Start (ESS)
(
GEA Refrigeration Technologies 7 Semi-hermetic Bock Compressors
4-cylinder compressors
Highlights HG/HA 4+5+6 series:
• 4-cylinder compressors
• 9 capacity stages: 40,5 to 122,4 m³/h [50 Hz]
48,6 to 146,9 m³/h [60 Hz]
• Part winding motor
• Drive motor flange mounted onto compressor
casing
• Extended standard equipment
• Standard oil pump, motor protection system MP10
• Capacity control with
• Bock Electronic Frequency Control (EFC)
• Mechanical capacity unloader (50%) (
• Start unloader with Bock Electronic Soft Start (ESS)
(
GEA Refrigeration Technologies
Highlights HG/HA 4+5+6 series:
4-cylinder compressors
GEA Refrigeration Technologies 9 Semi-hermetic Bock Compressors
6-cylinder compressors
Highlights HG7 series:
• 6-cylinder compressors
• 3 capacity stages: 140,7 m³/h
161,4 m³/h 50 Hz
183,6 m³/h
• Part winding motor
• Common casing for compressor and motor
• Capacity control with
• Bock Electronic Frequency Control (EFC)
• Mechanical capacity unloader (33/66%) (
• Start unloader with Bock Electronic Soft Start
(ESS) (
GEA Refrigeration Technologies
6-cylinder two-stage compressor HGZ7
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6-cylinder two-stage compressor HGZ7
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With Heat Exchanger Without Heat Exchanger
Qo= m (h1a - h8)
6-cylinder two-stage compressor HGZ7
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In operation with Heat Exchanger
and obtained Subcooling Δtch= 50 K,
you can reach >40% more efficiency!
Evaporating Temperature °C
Su
bco
olin
g T
em
pe
ratu
re °
C
exit h
ea
t e
xch
an
ge
r
Diagram to determine subcooling temperature
on exit heat exchanger
6-cylinder two-stage compressor HGZ7
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
GEA Refrigeration Technologies 15 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%) (
GEA Refrigeration Technologies 16 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
GEA Refrigeration Technologies 17 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
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Special features: Safe, reliable oil supply
• Lubricating system with oil pump independent of rotation direction
• Large volume oil sump
Semi-hermetic Bock Compressors 18
GEA Refrigeration Technologies 19 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
GEA Refrigeration Technologies 20 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
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• 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
GEA Refrigeration Technologies 22 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
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23 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
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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]
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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 Compressors 25
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
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Additional accessories
Start unloader/
Capacity regulator
Prepared for
capacity regulator
Oil pressure
safety switch
Oil differential
pressure sensor
Oil service valve
Semi-hermetic Bock Compressors 27
Thermal protection
thermostat
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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 Compressors 28
GEA Refrigeration Technologies
References Stationary Applications
Semi-hermetic Bock Compressors 29