Bitzer COMMAC SERIES :Bitzer 16/03/10 2:51 PM Page 1

Original
manufactured equipment

ComMECH Series
CSH AIR CONDITIONING SCREW PACKAGES

Superior Quality
Heat Exchange
packaged with
BITZER Compressor Sets
Bitzer COMMAC SERIES :Bitzer 16/03/10 2:51 PM Page 2

BITZER ComMECH Series

Benefits for System Owners & Installers
The BITZER ComMECH Series Compact Screw Compressor Pack offers contractors and
system owners a complete factory assembled system; designed and built by Bitzer Australia’s
trained staff to ensure optimal compatibility of all components which provides durability, reliability
and energy efficient performance in a compact system design.
The series offers the highest possible operational efficiency over a wide application range which
is increasingly important with the introduction of MEPS (Minimum Energy Performance
Standards) and a continually growing awareness of system operating costs.
Safety has been high on our designers’ priority, with the inclusion of all necessary pressure
controls and relief valve protection fitted as standard, as well as provision for correct mechanical
handling of the assembly during installation, ensuring a safety first approach.
Reduced installation times and minimal maintenance down time is achieved through excellent
access to all major components, with additional system isolation points installed as standard
thus allowing direct access to major serviceable components. With a complete offering of all
required components pre assembled on the package, minimal labour is required to complete the
system connection.
The Bitzer ComMECH Series includes an optional integrated Economizer System.
The Economizer design provides mechanical liquid sub-cooling of the systems liquid refrigerant
supply which delivers a significant improvement to the overall air conditioning system efficiency.
This application provides the system operator with a more stable operating condition even in
high ambient conditions and delivers to the system owner a significant reduction in operating
costs over the entire life of the plant.
Accurate load matching is achieved even with single compressor operation, through an
innovative capacity slider control within the CSH Screw Compressor.
The compressor has the capability to provide infinite capacity control or 4 step capacity control
to deliver the exact refrigeration capacity required to directly match the air conditioned space
requirements at any given time.
This flexible load matching design allows for full exploitation of low power consumption when
ambient temperatures decrease or the required duty falls below maximum design conditions.
This feature again delivers significant reductions in operating costs to the system owner.
Noise and vibration controls have been critically reviewed and maintained at extremely low levels
through modern advancements in BITZER Screw Compressor technology and innovative anti
vibration methods adopted within the package.
System refrigerant loss integrity has been enhanced through the use of pre-formed pipe work
and highly robust pipe fixings providing a significant reduction in the use of mechanical joints.
An optional fully integrated electrical system, complete with all component wiring and micro
processor controller, can be provided for compressor control management and safety monitoring
of the compressor under all operating conditions.
The BITZER CSH micro processor control has a number of active functions to bring the
compressor back to a safe operating condition prior to reaching the safety shutdown mode.
With extensive Bitzer Australia technical support throughout our National branch network, you
can be assured of professional assistance during the installation and operation of your project.

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ComMECH Series features

The BITZER ComMECH Series Screw Compressor packages
are designed to offer the best possible quality refrigeration plant
for commercial air conditioning and high temperature product
storage.
The heart of the package is the BITZER CSH Compact Screw
Compressor mounted on a rigid frame structure, raised to a
suitable working height for easy service access.
All pipe work and line components are individually engineered
to match each compressor selection providing optimum system
efficiency and performance.

The large volume liquid receiver is fitted

with full port flanged service valves, three
sight glasses for liquid indication and a
safety pressure relief valve.
A liquid by-pass assembly can also be
installed to reduce the required refrigerant charge during
normal operation.
The main liquid line is fitted with a generously sized multiple
core drier shell, charging valve, moisture indicator and isolation
valves, plus the option of a fully prepared Economizer
assembly(Liquid sub cooling heat exchanger assembly).
The suction line has a multiple core filter shell with access
valve for additional compressor protection.
Discharge, suction and liquid lines are securely fixed to the
rigid base frame assisting vibration minimization.
All connections are positioned externally of the package for direct connection to the air handler and
Buffalo LDV or VB Series Air Cooled Condensers.

The ComMECH Series can also be equipped with a powder coated

weather proof enclosure with six individual access doors, allowing
direct access to all major service components resulting in reduced
maintenance time.
The durable weather proof enclosure allows for the package to be
installed in external locations, such as a roof top condenser deck
where it is directly connected to the air cooled condenser.

The external enclosure is lined with sound absorbing high density

foam to assist in meeting the most stringent sound and
environmental conditions.
The frame structure provides built in fork lift access and crane lifting
points for safe handling during transport and installation.

Water Cooled Packages are also available

The liquid receiver can be replaced by a BITZER Shell & Tube Water Cooled
Condenser / Heat Exchanger, individually engineered to suit your project specification.
The Shell & Tube Condenser is fully piped within the package ready for commissioning.
The condensers are equipped with removable water side end caps for maintenance
cleaning and are also reversible providing flexibility for water connection.
Type designation
CSH7571-90-Y-45P semi hermetic screw compressor
CSH7571-90-Y-45P housing size
CSH7571-90-Y-45P code for displacement
CSH7571-90-Y-45P compressor execution (1 = standard )
CSH7571-90-Y-45P code for motor size
CSH7571-90-Y-45P oil charge (polyol ester for R134a and R407C )
CSH7571-90-Y-45P motor code

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BITZER CSH Screw Compressor design features

BITZER Compact Screws are of two-shaft rotary displacement design with newly developed profile
geometry. The main parts are male and female rotors, fitted into an enclosed housing precisely located at
both ends in roller contact bearings (radial and axial).
Owing to the specific design this type of compressor does not require any working valves. To protect
against reverse running when the compressor is switched off (expansion operation) a check valve is
incorporated in the discharge chamber.
An internal pressure relief valve is fitted providing over pressure protection.
The compressor is driven by a three-phase asynchronous motor which is built into the compressor
housing. The motor rotor is located directly on the shaft of the male screw rotor.
Motor cooling is achieved by the returning cold refrigerant vapour which mainly flows through the bores
in the motor rotor.

The deciding technical features are

Balanced product range Flexible application with additional cooling
• 8 basic models (5 featured in this package option) • Direct liquid injection
• Tight performance graduation • External oil cooler for extended application and
highest efficiency
Universal applications
• R134a, R407C Dual capacity control
• R404A, R507A and R22 available on request • Infinite or 4-step control with Vi compensation
• With or without Economizer Operation • Simple control by flanged solenoid valves
• Motor (Version 2) available especially matched for • Automatic start unloading
R134a
Economizer with sliding suction position
Proven long-life bearings with pressure • Unique for compact screws
unloading • Highest cooling capacity and energy efficiency at
• Robust axial bearings in tandem configuration full and part load conditions
• Bearing chamber pressure isolated by seal rings
• Pressure unloading of axial bearings

Optimized oil management

• Three stage oil separator
• Long-life fine 10um mesh size oil filter
• Pressure relieved bearing chamber ensuring
minimum refrigerant dilution into the oil thus
providing higher oil viscosity

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Electrical Control / Compressor Management Option

An optional fully integrated electrical system, complete with all component wiring and Microprocessor
controller can be provided for the direct control, management and safety monitoring of the BITZER
ComMECH Compressor package.

The unique BITZER micro-processor includes the following features;

• The programming logic included in the BITZER Macro block is specifically
designed for the BITZER CSH Semi Hermetic Screw Compressor.
• Utilizes all mechanical safety controls supplied as standard with compressor.
• Management of part winding start.
• 4 step capacity control regulation or Step less capacity control.
• Start unloading.
• Economizer / liquid injection control.
• Application limit protection. Condenser fan Variable speed drive
0-10V

• Start up with high temperature (after long off time). LP

• Oil level alarm. Driven by 4-20mA or

• Phase fail digital input. 0-5/10V A.I.

• Timing protection (even after blackout).

• In the event of a failed start the compressor is
allowed 2 additional restarts before it locks out. HP
Oil alarm

Phase
failure

Electrical Panel includes the following features;

• Quality switch gear and componentry
• Full wiring diagrams included
• Prepared and installed by qualified electricians
• Australian standards approved
• Reduction of site installation costs
• Generously sized cabling
• Terminal identification

Zone A – above the maximum condenser temp, stop

compressor immediately.
Zone B – limit to 75% allowed for 1 minute then if no in Zone C
then immediate compressor shut down.
Zone C – Capacity is unlimited and solely controlled by request.
Zone D – Unlimited time with a limit of 75% capacity.
Zone E – Limit of 50% capacity and a time limit of 10 minutes. If
not back in zone C then immediate compressor shut
down.
Zone F – unlimited capacity for 1 minute max. If not in zone C
then immediate compressor shut down.
Zone G – If reached when the unit is operational then immediate
compressor shutdown. At start the capacity is 50%
limited for a maximum of 5 minutes. If not back in zone
C then shutdown comp.

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Economiser Operation with Subcooling Circuit

Main Suction P
P2

ECO

PECO
P1
1 2 3 5

0˚ 360˚

Discharge
Economizer port suction compression discharge

The ease and efficiency of liquid sub-cooling is one of the special features of the Bitzer CSH screw compressor
which confirms its superiority above similar semi-hermetic screw compressors in the market today.
A part of the refrigerant mass flow from the condenser enters the sub-cooler via an expansion device, and
evaporates upon absorbing heat from the counter flowing liquid refrigerant (sub- cooling).
The superheated vapour is taken in at the compressor’s ECO connection, mixed with the mass flow from the
evaporator and compressed to a high pressure.
The ECO connection enters the compression chamber through the loading slide valve. This allows the sub-
cooling heat exchanger to operate on a consistent evaporation temperature ensuring minimal sub cooled liquid
temperature changes with-out the use of other evaporator control valves.
This design provides an overall balanced and stable system operation even during part load conditions.

Capacity Control

Capacity Regulation Solenoid 1,2 & 3 vent oil to suction in

stages to allow the piston to move the slide
valve towards the discharge end of the
compressor which is the unload position.

Solenoid 4 adds oil to hydraulic cylinder to

move the slide valve towards the suction
end of the rotors which loads the
compressor

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Application Limits
Application Limits Data Based on 20oC Suction Gas Temperature

Capacity Control
Step less capacity control 100% to 25% range Step less capacity control 100% to 50% range 4 step capacity control
CR 1 2 3 4 CR 1 2 3 4 CR 1 2 3 4
Start / stop Start / stop Start / stop
. . CAP 25%*
➡

CAP ● ◗
➡

CAP
. CAP min 50% . CAP 50%
➡

CAP ◗
➡

➡➡ ➡➡ CAP 75% ◗

solenoid de-energized CAP cooling capacity

solenoid energized CAP CAP increase
➡

CR2
. CR1
➡

solenoid pulsing CAP CAP decrease

CAP ➡➡ CAP constant
◗ solenoid intermittent

CAP 25%* The application ranges CR3

CSH6561-7571: 25% with capacity control

CR4
CSH6551-7561: 30% are restricted!
CSH7551:35% Refer application manual
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Compressor Capacities R134a

R134a STANDARD
Performance based on 10K suction gas superheat without liquid subcooling

MODEL Cond. Cooling capacity Power consumption

temp Qo [watt] Pe [kW]
Evaporation tempertaure
°C 12.5 10 7.5 5 0 -5 -10 -15 12.5 10 7.5 5 0 -5 -10 -15
CSH6551-35Y 30 96100 78900 64100 51400 40500 16.6 16.0 15.6 15.2 14.9
40 115100 104700 95100 86200 70200 56400 44600 34500 20.7 20.4 20.0 19.7 19.1 18.5 18.0 17.6
48 104100 94400 85500 77100 62300 49500 38600 29200 23.7 23.4 23.0 22.7 22.0 21.4 20.9 20.4
50 101100 91700 82900 74700 60200 47650 36950 37850 24.6 24.2 23.9 23.6 22.9 22.3 21.7 21.2
55 93500 84500 76200 68500 54700 42950 32900 26.9 26.6 26.2 25.9 25.2 24.6 24.0
CSH6561-40Y 30 119600 98100 79700 64100 50800 20.8 19.9 19.1 18.5 18.1
40 142800 130000 118100 107000 87300 70400 6510 43850 26.3 25.7 25.1 24.5 23.5 22.6 21.9 21.4
48 129000 117200 106200 96000 77900 62300 49100 37800 29.6 29.0 28.5 28.0 27.0 26.2 25.5 24.9
50 125400 113800 103100 93200 75400 60200 47250 36200 30.6 30.0 29.5 29.0 28.0 27.2 26.5 26.0
55 116200 105400 95300 85900 69200 54900 42600 33.3 32.8 32.3 31.8 31.0 30.2 29.7
CSH7551-50Y 30 143400 117300 94900 75700 59500 25.4 24.8 24.0 23.2 22.6
40 170500 154800 140200 126700 102600 81900 64200 49300 31.4 31.1 30.7 30.2 29.1 28.0 27.1 22.6
48 151700 137300 123800 111400 89200 70200 54100 40500 36.1 35.5 34.8 34.2 32.9 31.8 31.0 30.7
50 146800 132600 119500 107400 85700 67200 51500 38300 37.3 36.7 36.0 35.3 34.0 32.9 32.2 32.1
55 133900 120600 108300 970000 76700 59500 44850 40.6 39.9 39.2 38.5 37.2 36.3 35.5
CSH7561-60Y 30 167200 137200 111400 89400 70500 27.7 26.8 26.0 25.5 25.0
40 199000 181100 164500 149100 121400 97600 77200 59700 34.9 34.2 33.6 33.0 32.0 31.0 30.2 29.5
48 178900 162400 147000 132700 107100 85100 66200 49900 40.0 39.4 38.8 38.2 37.1 36.0 35.1 34.3
50 173600 157500 142400 128400 103300 81800 63200 47300 41.5 40.9 40.3 39.7 38.5 37.5 36.5 35.7
55 159900 144600 130400 117200 93500 73100 55500 45.6 45.0 44.4 43.7 42.6 41.5 40.5
CSH7571-70Y 30 185800 152400 123900 99600 79000 31.7 30.1 28.9 28.0 27.4
40 221300 20150 183000 165900 135300 109100 86700 67800 40.7 39.6 38.6 37.7 36.0 34.5 33.4 32.6
48 199500 181200 164200 148400 120200 96100 75500 58100 46.3 45.5 44.4 43.5 41.7 40.2 39.0 38.4
50 193800 175900 159300 143900 116300 92700 72600 55500 48.0 47.0 46.1 45.1 43.4 41.9 40.8 40.3
55 179200 162400 146800 132300 106300 84100 65200 52.6 51.7 50.8 49.9 48.2 46.8 46.0
CSH7581-80Y 30 217000 177900 144400 116000 92100 37.1 35.2 33.5 32.1 31.3
40 259000 235000 213000 193300 157200 126500 100500 78600 48.0 46.6 45.3 44.2 42.2 40.7 39.5 38.5
48 234000 212000 191600 172700 139200 110600 86400 66.1 54.7 53.2 52.0 50.9 49.2 47.9 46.6 45.0
50 227000 206000 185800 167300 134400 106300 82700 62.8 56.5 55.1 53.8 52.8 51.1 49.8 48.4 46.6
55 210000 189900 170800 153200 121800 95200 72700 53900 61.5 60.1 58.9 57.9 56.3 54.8 53.1 50.6
CSH7591-90Y 30 236000 194300 158400 128000 92100 41.6 39.5 38.0 36.9 31.3
40 284000 258000 235000 213000 173800 140600 112500 88800 51.7 50.7 49.7 48.9 47.4 46.1 44.9 43.7
48 258000 234000 212000 191900 155500 124500 98300 76300 59.5 58.6 57.8 57.0 55.5 54.1 52.5 50.7
50 252000 228000 206000 186400 150600 120200 94500 72900 61.9 61.0 60.1 59.3 57.8 56.3 54.6 52.6
55 234000 212000 191100 171900 137800 108800 84300 63800 68.6 67.6 66.7 65.8 64.0 62.1 59.9 57.4
Performance data based on 50 Hz
Additional cooling required and/or limited capacity regulation. Out of application range data on request

R134a ECONOMISED
Performance based on R134a economized operation with 10 K suction gas superheat and 10K temp diff (Tcu-Tms) across heat exchanger

MODEL Cond. Cooling capacity Power consumption

temp Qo [watt] Pe [kW]
Evaporation tempertaure
°C 12.5 10 7.5 5 0 -5 -10 -15 12.5 10 7.5 5 0 -5 -10 -15
CSH6551-35Y 30 100700 85000 71000 58700 47700 17.0 16.5 16.5 16.5 16.4
40 121800 112300 103300 94900 79500 66000 54000 43300 21.4 21.2 21.0 20.9 20.6 20.4 20.2 20.0
48 114400 105200 96600 88500 73700 60700 49200 39000 25.2 25.0 24.9 24.8 24.5 24.3 24.0 23.7
50 112200 103200 94600 86600 72100 59200 47900 37800 26.3 26.1 26.0 25.9 25.6 25.2 25.1 24.8
55 106400 97600 89400 81700 67700 55300 44400 34600 29.3 29.2 29.1 28.9 28.7 28.4 28.1 27.7
CSH6561-40Y 30 122000 103000 86100 71200 58300 21.0 20.3 19.8 19.5 15.4
40 147000 135000 124900 114800 96300 80000 65800 53400 26.6 26.1 25.7 25.3 24.7 24.2 23.8 23.6
48 137900 127000 116700 107000 89400 74000 60500 48600 30.6 30.2 29.9 29.6 29.0 28.6 28.3 28.0
50 135300 124500 114400 104900 87600 72400 59000 47200 31.7 31.4 31.1 30.8 30.3 29.9 29.6 29.3
55 128400 118000 108300 99200 82700 68100 55200 43700 35.0 34.7 34.5 34.3 33.9 33.6 33.4 33.1
CSH7551-50Y 30 152100 127900 106500 87700 71200 26.2 26.0 25.7 25.3 24.9
40 183200 168700 155100 142300 118700 98000 79600 63500 32.7 32.7 32.6 32.4 31.9 31.3 30.8 30.3
48 170900 157000 143900 131600 109100 89100 71500 55900 38.9 38.7 38.4 38.2 37.5 36.8 36.3 36.1
50 167400 153700 140800 128600 106400 86700 69200 53800 40.6 40.4 40.1 39.8 39.1 38.5 38.0 37.8
55 157900 144700 132300 120600 99100 80100 63200 45.3 45.1 44.7 44.4 43.7 43.2 42.8
CSH7561-60Y 30 174900 147500 123200 11800 83000 28.4 27.9 27.8 27.7 27.6
40 210000 194200 178800 164300 137800 114400 93600 752000 36.0 35.8 35.5 35.3 35.0 34.7 34.5 34.1
48 197300 181700 167000 135100 127700 105200 85100 76200 42.9 42.8 42.7 42.6 42.4 42.0 41.6 43.8
50 193600 178100 163600 149900 124900 102600 82700 64800 45.0 44.9 44.9 44.8 44.5 44.2 43.6 42.9
55 183400 168600 154500 141300 117100 95400 75900 58200 50.8 50.9 50.8 50.6 50.1 49.4 48.4
CSH7571-70Y 30 189300 160000 134000 111100 91100 31.9 30.7 30.0 29.6 29.5
40 228000 211000 194100 178600 150200 125100 103000 83700 41.4 40.3 39.6 39.0 37.9 37.1 36.6 36.3
48 215000 197900 182100 167200 140100 116100 95000 76200 47.9 47.4 46.8 46.3 45.3 44.5 44.0 43.8
50 211000 194300 178700 164100 137300 113600 92700 74200 50.0 49.4 48.9 48.4 47.5 46.8 46.3 46.1
55 201000 184700 169700 155600 129900 107100 86800 68800 55.7 55.3 54.9 54.5 53.7 53.1 52.9 53.0
CSH7581-80Y 30 226000 189700 158100 130500 106700 37.9 36.6 35.4 34.6 34.3
40 270000 250000 230000 211000 176100 145900 119600 96900 49.3 48.3 47.4 46.7 45.6 44.9 44.4 43.9
48 255000 234000 214000 195900 162700 133800 108600 86600 57.9 57.0 56.3 55.8 55.2 54.7 54.0 52.8
50 250000 229000 210000 191800 159000 130400 105400 83600 60.4 59.5 58.9 58.5 57.9 57.4 56.6 55.1
55 237000 217000 198200 180700 148900 121000 96700 75400 67.4 66.7 66.2 65.9 65.4 64.7 63.4 60.9
CSH7591-90Y 30 240000 203000 170200 141400 116500 41.8 40.2 39.2 38.7 38.5
40 291000 268000 247000 227000 190800 159000 131400 107500 52.2 51.4 50.8 50.3 49.6 49.0 48.5 47.9
48 275000 253000 233000 213000 178200 147500 120900 97700 61.2 60.8 60.4 60.1 59.5 58.9 58.0 56.8
50 271000 249000 228000 209000 174500 144200 117800 94900 64.0 63.6 63.2 62.9 62.3 61.6 60.7 59.2
55 258000 237000 217000 198300 164600 135100 109300 86800 71.9 71.5 71.1 70.7 70.0 69.0 67.5 65.4
Performance data based on 50 Hz
Additional cooling required and/or limited capacity regulation. Out of application range data on request
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Compressor Capacities R407C

R407C STANDARD
Performance based on 10K suction gas superheat without liquid subcooling
MODEL Cond. Cooling capacity Power consumption
temp Qo [watt] Pe [kW]
Evaporation tempertaure
°C 12.5 10 7.5 5 0 -5 -10 -15 12.5 10 7.5 5 0 -5 -10 -15
CSH6551-50Y 30 166900 152800 139600 115900 95400 77700 62400 26.7 25.9 25.2 24.0 23.0 22.2 21.5
40 163600 149600 136500 124300 102400 83300 66900 52700 33.1 32.0 31.1 30.3 29.0 28.0 27.2 26.2
48 145900 133100 121100 109800 89600 72000 56600 43100 37.6 36.8 36.1 35.4 34.2 33.1 31.9 3.7
50 141200 128700 116900 106000 86100 68800 72300 40400 38.8 38.2 37.5 36.9 35.6 34.4 33.2 32.0
55 128900 117200 106100 95800 77000 60500 45750 42.4 41.9 41.3 40.7 39.3 37.9 36.5
CSH6561-60Y 30 206200 188700 172500 143200 117800 95900 77000 32.4 31.6 30.8 29.4 28.2 27.2 26.4
40 201600 184500 168500 153600 126800 103600 83600 66300 40.7 39.3 38.2 37.2 35.6 34.5 33.6 32.7
48 180100 164900 150000 136500 112100 90800 80700 56200 43.6 45.3 44.4 43.5 42.2 41.0 40.0 39.0
50 174400 159300 145200 132000 108200 87400 69200 53300 47.9 47.0 46.2 45.4 44.1 42.9 41.8 40.8
55 160000 146000 132800 120400 98000 78300 60800 52.6 51.9 51.3 50.6 49.3 48.1 46.9
CSH7551-70Y 30 241200 220000 201600 167200 137500 111800 89700 38.0 36.8 35.8 34.1 32.7 31.5 30.4
40 235500 215200 196100 178800 147100 119700 95900 75400 45.9 44.9 43.9 43.2 41.8 40.7 39.8 38.9
48 210000 191800 174400 158100 128700 103000 80700 61000 52.6 52.0 51.4 50.8 49.7 48.5 47.4 46.1
50 204300 186000 168600 152900 123900 98600 76500 56900 54.7 54.2 53.6 53.2 52.0 50.7 49.4 47.9
55 187300 170000 153400 138400 110700 86200 64500 60.6 60.4 59.9 59.4 58.0 56.3 54.2
CSH7561-80Y 30 282700 259000 236500 196400 161600 131600 105700 44.3 42.9 41.7 39.7 38.1 36.8 35.7
40 277200 253500 231000 210700 173500 141300 113500 89400 54.8 53.0 51.5 50.2 48.1 46.5 45.0 43.5
48 247000 226000 205000 186300 152000 122200 96200 73500 62.3 61.0 59.8 58.7 56.7 54.8 52.9 50.9
50 239500 218200 198300 179800 146200 117000 91400 68900 64.4 63.2 62.1 61.1 59.0 57.0 55.0 53.0
55 218800 198900 180200 162700 130900 102900 78100 70.3 69.5 68.5 67.4 65.1 62.7 60.5
CSH7571-90Y 30 319900 293000 267600 222200 182900 148900 119600 49.2 47.9 46.7 44.6 42.8 41.4 40.1
40 312900 286400 262000 238500 196900 160900 129900 103000 61.7 59.7 57.9 56.4 54.1 52.3 51.0 49.6
48 280000 256000 133000 212000 174200 141200 112500 87500 70.3 68.7 67.3 66.1 64.0 62.2 60.7 59.2
50 271000 247600 226000 205100 168200 135900 107800 83100 72.7 71.3 70.1 68.9 66.9 65.1 63.5 62.0
55 248700 226900 206000 187300 152500 121900 94800 79.8 78.8 77.8 76.8 47.8 73.0 71.2
Performance data based on 50 Hz
Additional cooling required and/or limited capacity regulation. Out of application range data on request
R407C ECONOMISED
Performance based on R407C economized operation with 10 K suction gas superheat and 10K temp diff (Tcu-Tms) across heat exchanger

MODEL Cond. Cooling capacity Power consumption

temp Qo [watt] Pe [kW]
Evaporation tempertaure
°C 12.5 10 7.5 5 0 -5 -10 -15 12.5 10 7.5 5 0 -5 -10 -15
CSH6551-50Y 30 153300 142300 212400 102600 85900 71000 74.4 25.4 24.6 24.1 23.8 23.5
40 169000 156600 144800 133600 113000 94600 78300 63800 33.6 32.9 32.2 31.8 31.1 30.7 30.3 29.8
48 157100 145100 133800 123100 103400 85800 69900 555000 39.4 39.0 38.7 38.4 37.9 37.3 36.6 35.7
50 153500 141800 130600 120100 100600 83200 67400 41.1 40.8 40.6 40.3 39.8 39.1 38.4
55 144000 132700 122100 111900 93100 75900 45.8 45.8 45.6 45.4 44.7 43.9
CSH6561-60Y 30 145800 123500 103400 85500 29.6 28.9 28.4 28.0
40 187300 173700 160600 136200 114500 95100 77900 39.5 38.7 38.0 37.1 36.6 36.2 35.8
48 188400 174500 161200 148700 125500 104900 86400 69700 47.3 46.7 46.1 45.7 45 44.5 44.1 43.6
50 184400 170700 157600 145300 122500 102200 83800 49.3 48.7 48.3 47.9 47.7 46.9 46.4
55 173500 160400 148000 136200 114400 94600 54.9 54.7 54.5 54.3 53.8 53.2
CSH7551-70Y 30 224000 208000 117100 149700 125400 103600 37.1 36.4 35.4 34.7 34.2 33.7
40 246000 229000 212000 195400 165600 138900 115000 93400 47.2 46.6 46.2 45.9 45.6 45.4 45.1 44.7
48 232000 215000 198100 182400 153300 127000 103100 81100 56.4 56.5 56.5 56.5 56.5 56.2 55.5 54.3
50 228000 221000 194200 178600 149700 123400 99300 59.3 59.5 59.6 59.7 59.6 59.1 58.2
55 216000 199500 183400 168100 139300 112800 67.6 68.1 68.5 68.6 68.1 66.9
CSH7561-80Y 30 260000 241000 205000 173800 145500 120400 43.0 42.1 40.8 40.1 39.7 39.4
40 286000 265000 245000 227000 192000 161100 133500 108800 55.7 54.5 53.6 52.9 52.1 51.7 51.3 50.5
48 267000 247000 228000 210000 176800 147000 120000 95400 66.0 65.6 65.3 65 64.6 64.1 63.1 61.4
50 261000 242000 223000 205000 172400 142800 115900 69.1 68.9 68.8 68.6 68.2 67.6 66.3
55 246000 227000 209000 195200 160200 131000 78.1 78.5 78.7 78.7 78.1 76.9
CSH7571-90Y 30 226000 191800 160900 133300 44.9 43.9 43.2 42.7
40 291000 270000 250000 212000 179100 149300 122600 60.0 58.7 57.7 56.4 55.8 55.4 54.9
48 293000 272000 252000 233000 197400 165500 136800 110700 71.9 71.0 70.3 69.8 69.1 68.6 68.1 67.4
50 288000 267000 247000 228000 193200 161600 133100 75.0 74.3 73.8 73.4 72.8 72.3 71.8
55 272000 252000 233000 215000 181500 150700 83.9 83.9 83.8 83.6 83.2 82.7
Performance data based on 50 Hz
Additional cooling required and/or limited capacity regulation. Out of application range data on request

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SOUND DATA
Sound power and sound pressure levels for CSH screw compressors

Compressor Sound power level [dB(A)] Sound pressure level [dB(A)] Sound pressure level [dB(A)]
1 metre* 3 metres*

5SST 50SCT Load status R407C R134a Load status R407C R134a Load status R407C R134a
CSH 6551-35Y 100% 82.80 100% 74.80 100% 65.30
CSH 6551-50Y 100% 85.10 100% 77.10 100% 67.00
CSH 6561-40Y 100% 84.30 100% 76.30 100% 66.80
CSH 6561-60Y 100% 87.30 100% 79.30 100% 69.80
CSH 7551-50Y 100% 85.80 100% 77.80 100% 68.30
CSH 7551-70Y 100% 78.60 100% 79.60 100%
CSH 7561-60Y 100% 85.70 100% 77.70 100% 68.20
CSH 7561-80Y 100% 87.00 100% 80.00 100% 70.50
CSH 7571-70Y 100% 85.90 100% 77.90 100% 68.40
CSH 7571-90Y 100% 87.40 100% 80.40 100% 70.90
CSH 7581-80Y 100% 86.10 100% 78.10 100% 68.60
CSH 7591-90Y 100% 86.10 100% 78.10 100% 68.60

One-third octave bands

Compressor One-third octave band [dB(A)] Sound pressure
model level 2) 3)
125 250 500 1000 2000 4000 8000 [dB(A)]
CSH 6551-35Y R134a 29.6 59.1 79.3 77.5 66.4 57.8 50.6 74.8
CSH 6551-50Y R407C 27.7 60.9 76.0 72.0 67.3 63.0 54.1 77.1
CSH 6561-40Y R134a 31.2 60.3 80.4 79.3 69.0 58.9 50.3 76.3
CSH 6561-60Y R407C 34.1 65.7 78.3 79.1 77.6 67.3 52.8 79.3
CSH 7551-50Y R134a 43.3 70.7 80.3 74.0 72.0 61.8 51.7 77.8
CSH 7551-70Y R407C 42.8 69.1 78.6 80.6 76.5 67.3 54.3 79.6
CSH 7561-60Y R134a 45.8 75.1 77.8 80.7 72.2 62.1 50.1 77.7
CSH 7561-80Y R407C 42.3 70.5 78.6 81.3 75.7 67.3 54.6 80.0
CSH 7571-70Y R134a 37.0 72.8 76.6 76.3 75.9 64.4 55.9 77.9
CSH 7571-90Y R407C 39.3 71.9 82.2 79.4 76.1 66.1 55.2 80.4
CSH 7581-80Y R134a 31.3 70.0 78.2 79.1 72.9 63.8 55.4 78.1
CSH 7591-90Y R134a 44.8 70.1 77.6 77.8 74.1 61.2 50.0 78.1

1) One-third octave band of the sound power level (Test data based on EN ISO 9614-2)
2) *Based on freefield area with semi-spherical sound emission in 1m distance
3) *Corrected to 3.0 metres distance to accordance to Australian standard.
4) Tolerance ± 2dB(A)
5) Noise emission will vary on capacity load status of compressor. Data based on 100% loaded.
6) Sound data for panelized unit to be available when testing is completed
7) Basis: R407C/R134a, 50Hz, to/tc=+5/50˚C

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Technical Data
compressor motor oil unit Capacity discharge condenser suction liquid receiver motor Max Max starting
type version charge weight steps line drain line line line R134a/R407C connection operation power current
BSE170 in kg size size size size capacity ∆ /∆∆ current consum. ∆ /∆∆
kg amps (lock rotor)
amps
CSH6551-35Y 2 9.5L 595 1-5/8” 1-5/8” 2-1/8” 1-3/8” 103 / 90 52 34 kW 141 / 282

430V (+/-10%) ∆-3-50Hz (50/50 part wind 45P)

CSH6551-50Y

4 step 25,50,75, & 100% Stepless 25 to 100%

1 9.5L 603 1-5/8” 1-5/8” 2-1/8” 1-3/8” 103 / 90 73 52 kW 202 / 405
CSH6561-40Y 2 9.5L 595 1-5/8” 1-5/8” 2-1/8” 1-3/8” 103 / 90 60 41 kW 156 / 312
CSH6561-60Y 1 9.5L 603 1-5/8” 1-5/8” 2-1/8” 1-3/8” 103 / 90 97 65 kW 250 / 499

(refer application limits)

CSH7551-50Y 2 15L 793 2-1/8” 2-1/8” 3-1/8” 1-5/8” 126 / 110 73 52 kW 190 / 328
CSH7551-70Y 1 15L 808 2-1/8” 2-1/8” 3-1/8” 1-5/8” 126 / 110 115 78 kW 269 /448
CSH7561-60Y 2 15L 801 2-1/8” 2-1/8” 3-1/8” 1-5/8” 126 / 110 91 65 kW 247 / 415
CSH7561-80Y 1 15L 812 2-1/8” 2-1/8” 3-1/8” 1-5/8” 126 / 110 133 88 kW 324 / 541
CSH7571-70Y 2 15L 808 2-1/8” 2-1/8” 3-1/8” 1-5/8” 126 / 110 115 78 kW 268 / 448
CSH7571-90Y 1 15L 820 2-1/8” 2-1/8” 3-1/8” 1-5/8” 126 / 110 150 96 kW 391 / 634
CSH7581-80Y 2 15L 815 2-1/8” 2-1/8” 3-1/8” 1-5/8” 126 / 110 133 88 kW 324 / 541
CSH7591-90Y 2 15L 820 2-1/8” 2-1/8” 3-1/8” 1-5/8” 126 / 110 150 96 kW 391 / 634
Note- motor version 2 suitable for R134a refrigerant only

Dimensional Data
C
C1

DØ
A1 B1

A B

Dimensions
in millimetres (mm)

Model A A(1) B B1 C *C1 DØ

CSH 65 Series 1655 1555 855 755 1575 1420 16

CSH 75 Series 1855 1755 1005 905 1670 1350 16

*C1 = overall height without enclosure
B1
C

B
C1

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Contact Information Other Products Available-

Bitzer Australia
134 Dunheved Circuit,
St Marys, NSW 2760 VB Series
Australia - Compact design
- Evaporative
tel +61 (2) 8801 9300 pre-cooler assembly
fax +61 (2) 9673 4698 - 4 - 10 fans
info@bitzer.com.au (630mm & 800mm)
Victoria Three options of
tel +61 (3) 8326 8200 low noise models
fax +61 (3) 9310 2520
Queensland
tel +61 (7) 3274 3620
fax +61 (7) 3274 3621
South Australia Delta Series B
- Durable, marine grade
tel +61 (8) 8268 4500
housing
fax +61 (8) 8268 4555 - 4-10 fans
Western Australia (500mm, 630mm & 800mm)
tel +61 (8) 9359 2066 Statically and dynamically
fax +61 (8) 9359 2077 balanced fans for economic
and quiet operation

Bitzer New Zealand

Bitzer Australia Pty Ltd
13b Airborne Rd
Albany 0632
North Shore City
New Zealand FMC Series
tel +64 (9) 415 2030 - Condensers
fax +64 (9) 415 2031 - Modular design
- 630mm & 800mm fans
- Quiet fan options
Bitzer Refrigeration Asia Limited
200 Cantonment Road #06-02A,
Southpoint, Singapore 089763
tel +65 6220 4942 DISTRIBUTED BY:
fax +65 6220 4794
systems@bitzer.com.sg
www.bitzer.com.sg

Bitzer India
618 6th Floor, Nirmal Lifestyle
Corporate Office Building
Maharashtra
India
tel +91 22 25 67 60 06-9 In the interest of continuous improvement BITZER reserves the right to
tax +91 22 25 67 60 11 change the specifications or design of any of its products without notice.
The BITZER Symbol, name Bitzer Group of Companies and model
customercare@bitzer.in names are registered trade marks. All products manufactured are
pending design and specification registration and must not be copied or
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www.buffalotrident.com ISSUE: APRIL 2008