Grasso Screw Compressor - GEA Refrigeration Technologies

Grasso Screw Compressor
Screw compressors for
industrial refrigeration and air conditioning
GEA Refrigeration Technologies

Whether it’s in the food industry, chemical industry, in offices or in shipping, they all need refrigeration.
GEA Refrigeration Technologies has the optimal cooling and air conditioning solutions for your individual
requirements. We place particular value on energy efficiency, reliability, cost effectiveness and sustainability.
° In touch – All of our experience to meet your requirements
First class work based on
proven developments
The high level of reliability and long life of Grasso screw compressors come from more than fifty
years of experience in compressor technology. From development in our research laboratories to
the production process and quality assurance, we focus entirely on high quality and precision.
High-quality not only describes our products but also our customer service. We have a world-wide
distribution and service network placing us on site wherever you need us. Our software tools will
also support you in finding the optimum screw compressor design as well as assist you in your
search for the right spare parts.
Swept volume of Grasso screw compressors
Series
Swept volume
(m 3 /h)
0 100 200 300 400 500 600 700 800 900 1,000 2,000 4,000 6,000 8,000
Grasso SH 1)
231 - 371 m 3 /h
Grasso MC 1)
471 - 860 m 3 /h
Grasso LT 1)
805 - 8,560 m 3 /h
Grasso AC 2)
60 - 155 m 3 /h
1) at 2,940 min -1 , 2) at 2,500 - 6,000 min -1
08/2011 – RT-2011-0013-US-EU ° Subject to modification

More than cooling technology
Grass screw compressors are well-suited for numerous cooling
and air conditioning technology applications. The Grasso SH,
Grasso MC and Grasso LT series are designed in work with a
maximum design pressure of up to 28 bar in standard situation.
All compressors are also available in high-pressure models of
up to 52 bar (some models can be increased to 63 bar upon request).
They are particularly well-suited for extremely low temperatures,
CO 2 hot gas defrosting in cascade systems and for
heat pump operations. The Grasso AC series was also developed
with a maximum design pressure of 130 bar, meaning it can be
used in transcritical CO 2 heat pumps.
Advantages at a glance
° Stepless capacity control
° Variable internal volume ratio (Vi) for an efficient full and part
load operation
° Pressure ratings: 28 bar, 52 bar, 130 bar (63 upon request)
° Particular design for high pressure compressors:
Housing material (e.g. nodular cast iron), stronger thrust
bearing (TRIAX design), high perfomance shaft seal, stronger
driving shaft end, etc.
° Anti gas pulsation system for safe part load operation and
high pressure ratios
° Explosion proof design upon request
° Patented rotor profile, designed for efficient operation
and smooth running
° Hydraulic axial force compensation and high performance
bearings for a long product lifetime
° Hermetic position indicating for capacity and Vi-control
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Grasso SH
Technical features
° Integration of package components
° Integration of oil management system
° Compact design
° Suitable for all standard DIN-flange motors
° Rotors fully bedded on roller bearings
° Capacity and Vi control by parallel slide system
The Grasso SH series comes in four sizes can cover swept volumes ranging
from 231 to 372 m 3 /h. The simple design is owed by the integration of
the complete oil management system with only one oil connection and important
package elements in the compressor. The screw compressors come
equipped with connections for monitoring pressure and temperature, for
position displays on the control screen, and for controlling the integrated
solenoid valve assembly for combined Vi part load adjustment. The direct
assignment of the solenoid valves to Vi and part load regulation and the
connection of pressure and temperature sensors on the compressor ease
assembly and service work on the package. The parallel slide system allows
for Vi optimization and part load adaptation to take place simultaneously
and independently of one another. It means that even in part load
operations a low-loss work process is possible for the screw compressor.
Grasso MC
The Grasso MC series comes in four sizes with a swept volume ranging
from 471 to 860 m 3 /h. They have a simple and compact design between the
compressor and package, where some unit components may come already
integrated such as a suction side non-return valve, suction filter, an oil
pump along with an oil and hydraulic system with the appropriate solenoid
valve assemblies for Vi and part load adjustment. The control lines
for the solenoid valve for Vi part load controls are connected directly to
the compressor.
Technical features
° Integration of package components
° Integrated oil distribution system
° Compact design
° Roller bearings for thrust and radial load
° Stepless capacity and Vi control by parallel slide
system
08/2011 – RT-2011-0013-US-EU ° Subject to modification

Grasso LT
The Grasso LT series comes in fourteen sizes and with a swept volume
ranging from 805 to 8,560 m 3 /h. Due to the combined sleeve and antifriction
bearing in the rotors, the compressor has an extremely long life span
and low noise and vibration levels.
Technical features
° Excellent noise and vibration characteristics in all operating conditions
° Extremely long product lifetime
° Rotors have antifriction and sleeve bearings for maximum loads
° Stepless capacity and Vi control by tandem slide system
Grasso AC
The Grasso AC 130 bar screw compressor was specially developed for air
conditioning and heat pump applications using the natural refrigerants
CO 2 and NH 3 . It has a swept volume from 60 to 155 m 3 /h. The high pressure
compressor can be used in transcritical CO 2 heat pumps for larger
temperature ranges when preparing hot water on an industrial scale. Regardless
of the temperature profile it will be possible to heat water from
20 °C to more than 80 °C using CO 2 as heat pump fluid. To increase the
performance, the compressor may also be operated with an economizer.
Technical features
° Flanged motor
° Roller bearings
° Shaft seal
° Two economizer ports
° Speed controlled capacity adjustment
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Technical data
Grasso screw compressors
Series
Compressor Swept volume 2)
type 1) (m 3 /h)
Swept volume 3)
(cfm)
Max. design
pressure 4) (bar)
Dimensions
(mm)
DN1 5)
(mm)
DN2 6)
(mm)
Weight
(kg)
L B H
Grasso SH 7) C 231 164 28 / 52 888 8) 585 560 80 50 313
D 265 188 28 / 52 918 8) 585 560 80 50 324
E 321 228 28 / 52 975 8) 675 670 100 65 460
G 372 264 28 / 52 1004 8) 675 670 100 65 471
Grasso MC H 471 335 28 / 52 938 425 554 125 80 340
L 544 387 28 / 52 974 425 554 125 80 365
M 690 490 28 / 52 1090 480 610 150 100 580
N 860 611 28 / 52 1135 480 610 150 100 640
Grasso LT P 805 572 28 / 52 817 600 525 150 100 595
R 1,040 739 28 / 52 965 660 570 175 100 895
S 1,290 917 28 / 52 1,032 660 570 175 100 960
T 1,460 1,038 28 / 52 1,125 660 570 175 100 1,060
V 1,740 1,236 28 / 52 1,040 750 670 250 150 1,186
W 1,990 1,418 28 / 52 1,145 750 670 250 150 1,200
Y 2,390 1,703 28 / 52 1.161 750 670 250 150 1,308
Z 2,748 1,953 28 / 52 1,315 760 700 250 150 1,670
XA 3,250 2,309 28 / 52 1,425 760 700 250 150 1,740
XB 4,150 2,949 28 / 52 1,410 900 850 300 200 2,100
XC 4,900 3,486 28 / 52 1,480 900 850 300 200 2,400
XD 5,800 4,122 28 / 52 1,560 900 850 300 200 2,600
XE 7,110 5,095 28 1,625 980 980 400 250 3,500
XF 8,560 6,083 28 1,725 980 980 400 250 3,850
Grasso AC AC 155 9) 91 9) 130
446
744 8) 484
800 8) 478
800 8) 40 40 225
1) regarding swept volume, 2) at 2,940 min -1 , 3) at 3,550 min -1 , 4) some types 63 bar upon request, 5) suction connection, 6) discharge connection,
7) length and weight depending on motor, 8) with coupling housing, 9) at 6,000 min -1
08/2011 – RT-2011-0013-US-EU ° Subject to modification

Cooling and heating capacity
Series
Compressor 28 bar compressor 2)
type 1) (kW)
Cooling 4)
NH 3 -35/+35 °C
Cooling
NH 3 0/+35 °C
52 bar compressor 2)
(kW)
Cooling
CO 2 -50/-5 °C
Heating
NH 3 +35/+80 °C
130 bar compressor 3)
(kW)
Cooling 5)
CO 2 -5/+35 °C
Heating 6)
CO 2 +7/+20 °C
Grasso SH C 50 194 226 598 - -
D 60 230 268 - - -
E 72 279 312 851 - -
G 85 330 369 - - -
Grasso MC H 112 431 482 1,303 - -
L 129 498 556 1,510 - -
M 165 637 712 1,901 - -
N 206 795 888 - - -
Grasso LT P 201 772 851 2,345 - -
R 260 997 1,100 2,992 - -
S 322 1,236 1,391 3,720 - -
T 364 1,399 1,574 4,198 - -
V 443 1,690 1,870 5,051 - -
W 506 1,932 2,138 5,795 - -
Y 608 2,321 2,568 - - -
Z 700 2,670 2,953 7,905 - -
XA 827 3,157 3,528 - - -
XB 1,060 4,030 4,659 12,329 - -
XC 1,247 4,759 5,318 - - -
XD 1,476 5,634 6,295 - - -
XE 1,788 6,825 7,550 - - -
XF 2,135 8,148 - - - -
Grasso AC AC - - - - 408 1,000
1) regarding swept volume, 2) at 2,940 min -1 with 5 K superheat and 0 K subcooling, stated temperature values: evaporation/condensation
3) at 6,000 min -1 with 10 K superheat, stated temperature values: evaporation/gas cooler outlet
4) with economizer, 5) discharge pressure 90 bar, 6) discharge pressure 105 bar
If you have any questions about our Grasso screw compressors, we would be
pleased to help you: info@grasso.de, phone + 49 30 43 592 6
If you wish to find out more about our cooling solutions, please go to
our website: www.gearefrigeration.com
08/2011 – RT-2011-0013-US-EU ° Subject to modification
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08/2011 – RT-2011-0013-US-EU ° Subject to modification ° Copyright GEA
Please don’t hesitate to get in touch with us:
GEA Refrigeration Technologies and its companies are
located worldwide. Our complete addresses are available
on the internet under www.gearefrigeration.com
GEA Refrigeration Technologies
www.gearefrigeration.com