Emerson Copeland 4MTL-05 Instruction Manual

Copeland™Stream CO2
Semi-Hermetic Compressors
for Transcritical & Subcritical Applications
4MTL-05_ to 4MTL-50_
Application Guidelines
4MSL-03_ to 4MSL-15_

AGL_Stream_ST_4MTL_4MSL_EN_Rev02
About these guidelines..............................................................................................1
1Safety instructions..........................................................................................1
1.1 Icon explanation................................................................................................. 1
1.2 Safety statements............................................................................................... 1
1.3 General instructions............................................................................................ 2
2Product description ........................................................................................3
2.1 Compressor range.............................................................................................. 3
2.2 Nomenclature.................................................................................................... 4
2.3 Nameplate information........................................................................................ 4
2.4 Application range............................................................................................... 5
2.4.1 Qualified refrigerant and oils....................................................................... 5
2.4.2 Application limits ...................................................................................... 5
2.4.3 Recommendations forminimum suctionsuperheat –Lubricationconditions...... 6
2.5 Designfeatures.................................................................................................. 7
2.5.1 Compressorconstruction........................................................................... 7
2.5.2 Compressorcooling.................................................................................. 7
2.5.3 Lubrication.............................................................................................. 7
2.5.4 Oil level................................................................................................... 8
3Installation.....................................................................................................11
3.1 Compressor handling.........................................................................................11
3.1.1 Delivery.................................................................................................11
3.1.2 Transport and storage..............................................................................11
3.1.3 Positioning and securing...........................................................................11
3.1.4 Installation location..................................................................................12
3.1.5 Mounting parts........................................................................................12
3.2 Pressure safety controls.....................................................................................12
3.2.1 Safety relief valves ..................................................................................12
3.2.2 Maximum allowable pressures PS..............................................................14
3.2.3 Maximum operating pressures...................................................................14
3.3 Shut-off valves..................................................................................................14
3.3.1 Shut-offvalves design..............................................................................15
3.3.2 Explanation of supplier description.............................................................15
3.3.3 Additional information about shut-off valves.................................................15
3.3.4 Variations forshut-off valves.....................................................................16
3.4 Screens...........................................................................................................17
4Electrical connection ....................................................................................18
4.1 General recommendations..................................................................................18
4.2 Electrical installation..........................................................................................18
4.2.1 Part-winding motors (YY/Y) –Code A.........................................................18
4.2.2 Part-winding motors (YY/Y) –Code F.........................................................18

AGL_Stream_ST_4MTL_4MSL_EN_Rev02
4.2.3 Star / Delta motors (Y/∆) – Code E.............................................................18
4.2.4 Terminal box isolators and jumpers position................................................19
4.3 Compressor protection.......................................................................................20
4.3.1 Compressors with Copeland Compressor Electronics (formerly Next Generation
CoreSense).......................................................................................................20
4.3.2 Copeland Protection................................................................................24
4.3.3 Compressors with CoreSense Diagnostics (until December 2019)..................27
4.4 Electricalprotection (fuses).................................................................................30
4.5 Crankcase heater..............................................................................................30
5Start-up & operation......................................................................................32
5.1 Leak test..........................................................................................................32
5.2 System evacuation............................................................................................32
5.3 Preliminary checks –Pre-starting.........................................................................32
5.4 Charging procedure...........................................................................................33
5.5 Initial start-up....................................................................................................33
5.6 Minimum run time..............................................................................................33
5.7 Inverteroperation..............................................................................................34
5.7.1 Maximum Operating Current –Models 4MTL-35 to 4MTL-50.........................34
5.7.2 Recommendations for use with an inverter..................................................34
6Maintenance & repair....................................................................................35
6.1 Exchanging the refrigerant..................................................................................35
6.2 Replacing a compressor.....................................................................................35
6.3 Lubrication and oil removal .................................................................................35
6.4 Oil additives......................................................................................................36
6.5 Unbrazing system components............................................................................36
7Dismantling & disposal.................................................................................36
Appendix 1: Connections of Stream CO2compressors..........................................37
Appendix 2: Tightening torques in Nm....................................................................38
Appendix 3: T-plate isolators depending on motor version & power supply.........40
DISCLAIMER.............................................................................................................41

AGL_Stream_ST_4MTL_4MSL_EN_Rev02 1
About these guidelines
The purpose of these application guidelines is to provide guidance in the applicationof Copeland™
Stream semi-hermetic compressorsin user’s systems operating with CO2(R744). They areintended
to answer the questions raised while designing, assembling and operating a system with these
products.
Besides the support they provide, the instructions listed herein are also critical forthe proper and
safe functioning of the compressors. The performance and reliability ofthe product maybe impacted
if the productis not used according to these guidelines or is misused.
These application guidelines cover stationary applications only. For mobile applications, contact
Application Engineering as other considerations may apply.
1 Safety instructions
Copeland™semi-hermetic compressors are manufactured according to the latest European safety
standards. Particular emphasis hasbeen placed on the user’s safety.
Copeland Stream CO2compressors are intended for installation in systems in accordance with the
European MachineryDirective MD 2006/42/EC and Low Voltage Directive LVD 2014/35/EU. They
may be put to service only if they have been installed in systems according to instructions and
conformto the corresponding provisions oflegislation. Conformity to locallegislation and regulations
must also be observed. For relevant standards please refer to the Manufacturer’s Declaration,
available at www.climate.emerson.com/en-gb.
The Material Safety Datasheet (MSDS) for R744 shallbe considered when working with this type of
refrigerant - please check thisdocumentprovided by the gas supplier.
These instructions should be retained throughout the lifetime of the compressor.
You are strongly advised to follow these safety instructions.
1.1 Icon explanation
WARNING
This icon indicates instructions to
avoid personal injury and material
damage.
CAUTION
Thisiconindicatesinstructionstoavoid
property damage and possible
personal injury.
High voltage
This icon indicates operations with a
dangerof electricshock.
IMPORTANT
Thisiconindicatesinstructionstoavoid
malfunction of the compressor.
Danger of burning or frostbite
This icon indicates operations with a
danger of burning orfrostburn.
NOTE
This word indicatesa recommendation
foreasieroperation.
Explosion hazard
This icon indicates operations with a
dangerof explosion.
1.2 Safetystatements
▪Refrigerant compressors must be employed only for their intended use. The system has
to be labelled according to the applicablestandards and legislation.
▪Only qualified and authorized RACHP (refrigeration, air conditioning and heat pump)
personnel are permitted to install, commissionand maintain this equipment.
▪Electrical connections must be made by qualified electrical personnel.
▪All valid standards for connecting electrical and refrigeration equipment must be
observed.
▪Thenational legislation andregulationsregardingpersonnel protectionmustbeobserved.
Use personal safety equipment. Safety goggles, gloves,
protective clothing, safety boots and hard hats should be worn
where necessary.

2 AGL_Stream_ST_4MTL_4MSL_EN_Rev02
1.3 General instructions
WARNING
Pressurized system! Serious personal injuries and/or system
breakdown!Accidentalsystemstartbeforecompleteset-upmustbeavoided.
Never leave the system unattended without locking itout electrically when it is
on vacuum and has no refrigerant charge,when it has a holding chargeof
nitrogen, or when the compressor service valvesare closed.
WARNING
System breakdown! Personal injuries! Only approved refrigerants and
refrigeration oilsmust be used.
WARNING
CO2refrigerant! Danger of suffocation! Never release significant volumes
of CO2ortheentirecontentsofthesystemintoclosedrooms.Incaseofclosed
room, if possible,keep the room well ventilated and/or install a CO2detection
device. CO2is odourless and colourless, so it cannot be perceived directly in
case of emission.
WARNING
High shell temperature! Burning! Do not touch the compressor and piping
until they have cooled down.Ensure that other materials in the area of the
compressor do not come into contact with it. Lock and mark accessible
sections.
CAUTION
Overheating! Bearing damage! Do not operate compressor without
refrigerant charge orwithoutit being connected to the system.
CAUTION
Contact with refrigerant oil! Material damage! Polyolester(POE) or poly-
alkylene glycol (PAG) lubricants must be handled carefully and the proper
protective equipment(gloves, eye protection,etc.) must be used at all times.
Refrigerant oil must not come into contact with any surface or material that it
might damage,includingwithoutlimitation, certain polymers, eg,PVC/CPVC
and polycarbonate.
IMPORTANT
Transit damage! Compressor malfunction! Use original packaging.Avoid
collisions and tilting.

AGL_Stream_ST_4MTL_4MSL_EN_Rev02 3
2 Product description
2.1 Compressorrange
These application guidelines cover Copeland™Stream semi-hermetic compressors using CO2
(R744). The series of 4MTL* transcritical models ranges from 5 to 50 hp; the series of 4MSL*
subcritical models ranges from3 to 15 hp. The performance values shown in Table 1 are valid for
50 Hz supply frequency.
Compressor
Displacement
(m³/h)
Cooling capacity
Qo* (kW)
COP
Netweight
(kg)
Footprint
(mmx mm)
4MTL-05_
4.6
8.831)
1.62
124
368 x 256
4MTL-07_
6.2
11.851)
1.66
4MTL-09_
7.4
14.591)
1.67
4MTL-12_
9.5
19.241)
1.70
170
4MTL-15_
12.5
25.161)
1.75
4MTL-30_
17.9
36.991)
1.80
4MTL-35_
22.7
46.901)
1.79
270
4MTL-40_
26.6
55.901)
1.84
4MTL-50_
32.0
67.801)
1.81
4MSL-03_
4.6
7.802)
3.80
124
4MSL-04_
6.2
10.402)
3.80
4MSL-06_
7.4
12.802)
3.90
4MSL-08_
9.5
16.302)
3.80
170
4MSL-12_
12.5
20.702)
3.90
4MSL-15_
17.9
31.502)
3.90
1) Evaporating -10 °C; gas cooler outlet temp 35 °C; high pressure 90 bar; superheat 10 K; subcooling 0 K
2) Evaporating -35 °C; condensing -5 °C; superheat 10 K; subcooling 0 K
Table 1: Stream CO2compressors range andperformance atfull load (100 %)
Table 2 shows the key pressure valuesthat are relevantto the use of StreamCO2compressors.
Compressor
Motor
Maximumoperating
pressure(MOP)
(bar(a))
Standstill pressure
(nameplate)
PS / PSS (bar(a))
Burst
pressure
(bar(a))
4MTL-05_
EWL
FWM/D
120 / 50.9
135 / 90
420 / 330
4MTL-07_
4MTL-09_
4MTL-12_
AWM/D
EWL
120 / 50.9
135 / 90
420 / 330
4MTL-15_
4MTL-30_
120 / 42
4MTL-35_
AWM/D
EWL
110/ 42
135 / 90
420 / 330
4MTL-40_
4MTL-50_
4MSL-03_
EWL
FWM/D
60 / 23
135 / 90
420 / 330
4MSL-04_
4MSL-06_
4MSL-08_
AWM/D
EWL
60 / 23
135 / 90
420 / 330
4MSL-12_
4MSL-15_
Table 2: Stream CO2compressor pressures
The line-up of 4-cylinderStream semi-hermeticcompressors forCO2transcriticalapplicationsisthe
ideal solution for the medium temperature section of booster systems. This range is designed for

4 AGL_Stream_ST_4MTL_4MSL_EN_Rev02
maximum standstillpressures of 135 bar at high side and 90 barat low side –see section 3.2.1
"Safetyreliefvalves".Refrigerantflowand heattransferhavebeenoptimizedforbest performance.
NOTE: The pressure values shown withthe bar(a) or barunit in these guidelines are absolute
pressures. For values in relative (gauge)pressure,bar(g)will be used.
NOTE: The compressor is only one component which mustbe combined with many others to
build a functionaland efficient refrigeration system. Therefore the information in this manual
relates to Copeland Stream semi-hermetic compressors for CO2transcritical and subcritical
applications withstandard equipment and accessories only.
2.2 Nomenclature
The model designation containsthe following technical information about StreamCO2compressors:
Figure 1: Nomenclature
* The oil type is indicated on the nameplate –see section 2.3 "Nameplate information". Several
oils are qualified –see section 2.4.1 "Qualified refrigerant andoils".
2.3 Nameplate information
All important information for identification of the compressor is printed on the nameplate located
below the left cylinderbank:
▪the year and month of production are shown as part of the serial number (Jan = A, Feb = B, …
Dec = L);
▪type of refrigerant (R744);
▪type of lubricant: POE orPAG.
Figure 2: Nameplate information
20C = Produced in March 2020
POE68 = Oil type
R744 = CO2refrigerant

AGL_Stream_ST_4MTL_4MSL_EN_Rev02 5
2.4 Application range
2.4.1 Qualified refrigerant and oils
Stream CO2compressors are delivered with POE oil. Large models (4MTL-35 to 4MTL-50) can
alternatively be delivered on request with PAGoil.
Oil recharge values can be taken from Copeland Select software available at
www.climate.emerson.com/en-gb.
Qualified refrigerant
R744 (CO2)
Copeland standard oils
RL 68 HB (POE 68)
RFL 68EP (PAG 68)
Qualified servicing oils
RL 68 HB (POE 68)
RFL 68EP (PAG 68)
Factoryoil charge
(litres)
Medium
temp
Low
temp
Medium
temp
Low
temp
Medium
temp
4MTL-05
4MTL-07
4MTL-09
4MSL-03
4MSL-04
4MSL-06
4MTL-12
4MTL-15
4MTL-30
4MSL-08
4MSL-12
4MSL-15
4MTL-35*
4MTL-40*
4MTL-50*
1.3
1.8
2.8
* PAG oil qualification in process
Table 3: Qualified refrigerantandoils & factory oil charges
To recharge:
▪When thecompressoris completely emptyof oil, the amountof oil to be "recharged"is typically
0.12 litre less than the original oil charge (oil will alreadybe present in the system).
To top up:
▪During commissioning,planned maintenance or servicing, add oil so thatthe compressor oil level
is between min ¼ and max ¾ of side sight glasses and fullin the housing cover sight glass.
▪Recommended quality for carbon dioxide purity class: 4.0 [(≥ 99.99 %) H2O ≤ 10 ppm,
O2 ≤ 10 ppm, N2≤ 50 ppm] or higher.
2.4.2 Application limits
WARNING
Oil dilution due to low superheat! Compressor breakdown! Lowsuction
superheat leads to oil dilution. Always operate the system with adequate
superheat to avoid oil viscosity decrease. Additional measures in system
design might help to avoid inacceptable lubrication conditions.
The operatingenvelopes oftranscritical and subcritical StreamCO2compressors are shown below.
Figure 3: Operatingenvelopes fortranscritical applications withR744 –Models 4MTL-05 to4MTL-15

6 AGL_Stream_ST_4MTL_4MSL_EN_Rev02
Figure 4: Operatingenvelopes for transcritical applications withR744 –Models 4MTL-30 to4MTL-50
Figure 5: Operatingenvelope forsubcritical applications withR744 –Models 4MSL-03 to4MSL-15
2.4.3 Recommendations for minimumsuction superheat –Lubrication conditions
The operation of CO2compressors at conditionswherethe viscosity of theoil is lowmight become
very harmful with regard to compressor lifetime expectancy. Indicators like oil temperature and
discharge temperature must be observed to judge about the lubricationconditions. Depending on
the application (low temp, medium temp, parallel compression, etc.) different minimum suction
superheat values have to be respected to secure maximumprotection ofthe compressor. In general,
higher superheat on the suction inlet of a compressor provides highersafety, butthe limits forthe
maximum allowable discharge temperature have to be considered as well (superheat has a direct
impact on the discharge temperature).
Particularattention should be paid to the following points:
▪Measuring thesuctionsuperheat becomesmorecriticalwithlargerdiametersonthesuctiontube.
Ensure proper positioning of sensor. Sensor sleeves must be used with large diameters.
▪The oil temperature ismeasured on the bottom (lowest position) of the compressor shell directly
between the two sight glasses. The use of sensors for measurements on a plain surface is
preferable for best accuracy.
▪The discharge temperature can be read through Modbus from the Copeland compressor
electronics module.If an additionalsensor is applied to the discharge line (as close as possible

AGL_Stream_ST_4MTL_4MSL_EN_Rev02 7
to the discharge shut-off valve)the temperature is expected to be 15-20 K lower than inside the
cylinder head. This fact must betaken into accountwhen applying the values inTable 4 below.
Application
Minimum
superheat
required
Minimum oil
temperature
required
Maximum
acceptable
discharge
temperature
Low temp
20 K / 36 °F
30 °C/ 86°F
154.4°C / 310 °F
Medium temp
10 K / 18 °F
30 °C / 86°F
154.4°C / 310 °F
Compressorsinparallel
or multi-compressors
10 K / 18 °F
30 °C/ 86°F
154.4°C / 310 °F
Table 4: Superheat recommendations
Caution! The values shown in Table 4 are maximum temperature valuesinside the cylinder head.
When using a discharge temperature sensor on the discharge line, the temperature drop has to be
considered for the high DLTcut-out setpoint.
NOTE: An additional internalheat exchanger might be required to ensure the recommended
suction superheat values on the compressor inlet are achieved.
2.5 Design features
2.5.1 Compressor construction
Stream CO2 compressors have a large discharge chamber to eliminate pulsations. The cylinder
heads and the discharge plenumare designed to minimize the heattransfer to suction side.
Each cylinder head has a plugged 1/8" - 27 NPTF tapped hole on the high pressure.
Figure 6: Compressor external view
2.5.2 Compressor cooling
Compressormotor cooling must be ensured in all circumstances.
All Stream CO2 compressors are suction gas-cooled. With suction gas-cooled compressors, the
motor is cooled byrefrigerant gasthat is led through / over the motor. Depending upon the operating
conditions, the maximum allowed suction gas superheat shall notexceed the values shown in the
envelopes.
2.5.3 Lubrication
For small- and medium-size Stream CO2compressors(4MSL-03 to 4MSL-15, 4MTL-05 to 4MTL-
30), an oil splasher system ensures proper lubrication at constantor variable speed.
For large models (4MTL-35 to 4MTL-50) an oil pump is used:
▪On compressorsdelivered with Copeland™Compressor Electronics (-N), theoil pump integrates
an electronic switch to ensure the oilpressure safety functionality.
▪Compressors with Copeland™Protection (-P)are designed to accommodate fittings for an OPS2
or a standard oil pressure switch (OPS2 oil sensor included in the oil pump).
▪The oil pumps used onthese compressors are independentof their rotating direction.

8 AGL_Stream_ST_4MTL_4MSL_EN_Rev02
Compressor
size
Transcritical
mode
Lubrication
system
Subcritical
mode
Lubrication
system
Small
4MTL-05
Splasher
4MSL-03
Splasher
4MTL-07
4MSL-04
4MTL-09
4MSL-06
Medium
4MTL-12
Splasher
4MSL-08
Splasher
4MTL-15
4MSL-12
4MTL-30
4MSL-15
Large
4MTL-35
Oil pump
-
-
4MTL-40
4MTL-50
Table 5: Lubrication system on Stream CO2compressors
2.5.4 Oil level
Small- and medium-size models (4MSL-03 to 4MSL-15, 4MTL-05 to 4MTL-30) are equipped with
three identical sight glasses, one at each side of the compressor and one at the front.
Sight glasses (2)
Figure 7: Sight glasses locationonsmall andmedium models
Large models (4MTL-35 to 4MTL-50) are equipped with 2 sightglasses.
Figure 8: Sight glasses &oil sensor on large models
All 4MTL* & 4MSL* compressorsare delivered with sufficientoil for normaloperation –seeTable 3.
The optimum oil level should be checked byoperating the compressor untilthe systemisstable and
then comparing the sightglassreading with the corresponding diagram below. The oil level should
be min ¼ and max ¾ of theside sight glasses and fullin the housing cover sight glass.
The housing cover sightglass serves onlyas a means of checking the oil level in the compressor
crankcase and cannotbe used for its control.
If anoilregulatorisused,ahigheroillevelmaybeacceptedastheoilseparatorwillreduceexcessive
oil circulation.The oil regulator has to be installed in place of one of the side sightglasses. The oil
levelshouldbemin¼and max ¾ofthesightglass.Thelevelcanalso becheckedwithin10seconds
of compressorshutdown.
The sight glass thread is1 1/8"-18 UNEF, and the tightening torque is 50 to 60 Nm.

AGL_Stream_ST_4MTL_4MSL_EN_Rev02 9
Figure 9: Sight glass design Figure 10: Sightglass reading
For small- and medium-size compressors,as they do not have an oil pump, an oil pressure safety
controlcannotbeusedtoprotectthecompressoragainstlubricationproblems. However,afloatlevel
switch for oil can be used to protect the compressor againstoilloss.
2.5.4.1 Oil level management device OM5TraxOil
Active oil level managementis a must in order to ensure reliable compressoroperation,in particular
inrefrigerationapplicationswithvaryingoperatingconditionsand defrostcycles. Anadditionalbenefit
of active systems is that, in additionto oil balancing, they normallyalso monitorthe oil level and
provide alarm capabilities.
Maintaining proper oil level is of primary importance for a long compressor lifetime.
The OM5 TraxOil uses a Hall effect sensor to measure the oil level. A magnetic floatchanges its
position according to the oil level. The Hall sensor converts the magnetic field changes into an
equivalent signal, which is used by the internal integrated electronics to evaluate the oil level.
The OM5 TraxOil provides both an oil level
monitoring function and an oil level balancing
function for active oillevel managementsystems,
especiallyin CO2applications.
The OM5 TraxOil has been developed and
specially optimized for CO2systems where
maximum working pressures above 60 bar and up
to 130 bar are required.
The OM5 TraxOil is designed to feed oil in
subcritical or transcritical CO2compressorswhen
necessary.
The oillevelcontrolis dividedinto3zones:normal,
warning and alarm.
More information aboutthis product can be found
at www.climate.emerson.com/en-gb.
2.5.4.2 Oil level monitoring systemOW4/OW5 TraxOil
The OW4 and OW5 TraxOil are intended for systems which only require oil level monitoring and
alarming and do notneed activeoil level balancing.
▪OW4 is designed for CO2subcritical applications
▪OW5 is designed for CO2transcriticalapplications
Figure 12: OW4/OW5 TraxOil for oil level monitoring
Figure 11: TraxOil OM5 withsight glass & coil

10 AGL_Stream_ST_4MTL_4MSL_EN_Rev02
The level control is divided into 3 zones: normal, warning and alarm.
If theoilleveldropsintothered zone,theOW4/OW5generatesanalarmsignalandthealarmcontact
(SPDT) changesinto alarm state.The alarm contact maybe used to shut down the compressor. The
alarm will be reset when theoil level goes back to normal.
More information about this product can be found at www.climate.emerson.com/en-gb.

AGL_Stream_ST_4MTL_4MSL_EN_Rev02 11
3 Installation
WARNING
High pressure! Injury to skinand eyes possible! Be careful when opening
connections on a pressurized item.
3.1 Compressorhandling
3.1.1 Delivery
Please check whether the delivery is correct and complete. Any deficiency should be reported
immediately in writing.
Standard delivery:
▪Suction and discharge shut-off valves
▪Pressure relief valve on discharge
▪Oil charge, oilsightglasses
▪Crankcase heater 230 V
▪Mounting parts kit (rubber)
▪Copeland CompressorElectronics or Copeland Protection
▪Holding charge up to 2.5 bar(g) (dryair)
▪Electrical terminals
3.1.2 Transport and storage
WARNING
Risk of collapse! Personal injuries! Move compressors only with
appropriate mechanical or handling equipment according to weight. Keep in
the upright position. Respect stacking loads according to Figure 13. Check
the tilting stability and if needed take action to ensure the stability of the
stacked loads. Keep the packaging dry at all times.
Respect the maximum number of identical packages which may be stacked on one
another, where "n" is the limiting number:
▪Transport: n = 1
▪Storage: n = 1
Figure 13: Maximum stacking loads for transportand storage
NOTE: The compressor is pre-chargedwith dry airto avoid any moisture contamination.
Compressors are delivered on pallets. Accessories may be mounted or delivered loose.
3.1.3 Positioning and securing
IMPORTANT
Handling damage! Compressor malfunction! Only use the lifting eyes
whenever the compressor requires positioning. Using discharge or suction
connections for lifting may cause damage or leaks.
If possible, the compressor should be kept horizontal
during handling.
For safety reasonstwo lifting eyes should be fitted before
moving a compressor (½" - 13 UNC, ident number
2932854). Otherwise refer to drawing in Figure 14 to see
how to apply another lifting method.
In order to avoid refrigerant leaks or other damage the
compressors should never be lifted by the service valves
or otheraccessories.
Figure 14: Compressor lifting

12 AGL_Stream_ST_4MTL_4MSL_EN_Rev02
3.1.4 Installation location
Ensure the compressorsare installed on a solid level base. Horizontalinstallation is recommended.
Temperatures around the compressor should not exceed 65 °C in order to avoid suction gas
temperature increase and malfunctioning of electronics.
3.1.5 Mounting parts
To minimize vibration and start/stop impulsesflexible mounting should be used. For this purpose,
one set of rubber mounting parts is delivered with each compressor. The mounting kit can be used
for single and parallel operation.
Figure 15: Compressor mounting parts
A compressor may be rigidly mounted, ie, without mounting parts. In this case more shock and
vibration loading willbe transmitted to the frame. Use only the compressor footfor fixation and avoid
direct contact of other parts of the compressorhousing with bordering components or base frame.
Unevennessinthemountingsurfacewillhavetobecompensatedbytherackand/orthecompressor
bottomplate/feet. Excessive unevenness can result in too high mechanical stress to the systemand
could damage the compressor or rack. Therefore,the flatness of the mounting location is essential.
In addition, both vibration/shock and mechanical stress to compressor can be avoided by using
rubber mounting parts.
If the installation requires a very high level of vibration absorption,additional vibration absorbers –
available on the market –can be fitted between the rails and the foundation.
3.2 Pressure safetycontrols
3.2.1 Safety relief valves
CAUTION
High pressure! System leak! In the event that a pressure relief valve
activates repeatedly, check and replace it as needed in order to avoid a
permanent leak. Always check system for CO2loss after activation of the
pressure relief valve.
The compressoris fittedwithapressurereliefvalveonthedischargeside(135bar,factorymounted).
If excessive pressures are reached,the valve opensand prevents further pressure increase. CO2is
then blown off to the ambient.
An optional pressure relief valve (90 bar) is available for the suctionside. Typically the suction side
of the systemis anyhow protected by an additional pressure relief valve.This system pressure relief
valve is also acceptable for compressor protection.
The pressure relief valve does not replace pressure switches or additional safety valves in the
system.
▪High-pressure side (HP): 135 bar
Locknut
Washer
Rubber spacer
Body mounting foot
Rubber spacer
Rubber pad
Spacer
Screw hex head

AGL_Stream_ST_4MTL_4MSL_EN_Rev02 13
Usually after a blow-off, pressure relief valves are no longer perfectly tight. Therefore it is
recommended to replace them after any blow-off.
The following picturesshow the position of the pressure relief valve (high side)and the position of
the plug (low side).
Figure 16: Positionof the pressure reliefvalve –Models 4MTL-05 to4MTL-09 & 4MSL-03 to 4MSL-06
Figure 17: Positionof the pressure reliefvalve –Models 4MTL-12 to4MTL-30 & 4MSL-08 to 4MSL-15
Figure 18: Positionof the pressure reliefvalve –Models 4MTL-35 to4MTL-50
PRV (high side)
Plug (low side)
PRV (high side)
Plug (low side)

14 AGL_Stream_ST_4MTL_4MSL_EN_Rev02
3.2.2 Maximum allowable pressures PS
The maximum allowable pressures PS according to EN12693 are shown on the compressor
nameplate; theyare mandatoryand must not beexceeded.
▪For transcriticalapplications: High-pressure side (HP): 135 bar
Low-pressure side (LP): 90 bar
▪For subcritical applications: High-pressure side (HP): 135 bar
Low-pressure side (LP): 90 bar
All pressures are expressed in bar(a) (absolute pressure).
3.2.3 Maximum operating pressures
The maximum operating pressures according to the envelopes shown in section2.4.2 "Application
limits" have to be respected during compressor operation. Running a compressor outside the
envelope could lead to compressor breakdownand/orsystemfailure.
The position of the HP and LP connections is shown in Appendix 1 "Connections of StreamCO2
compressors". It is recommended to connect the pressure cut-out devices directly to the
compressor housing. For the high-pressure cut-outswitch, one of the connection ports "4" can be
used –see Appendix 1. For the low-pressure cut-outconnection,port "6" is recommended;it is
located on the right-hand side of the compressor, ie, the side where the electrical box is installed,
above the oil level.
NOTE: The compressor operating range may be restricted for various reasons. Check the
application range limitations in Copeland Select software at www.climate.emerson.com/en-
gb.
3.3 Shut-off valves
Stream CO2compressors are factory-equipped with shut-off valves on both the suction and
discharge sides. The shut-offvalves are suitablefor welding and brazing.
Compressor
Displacement
(m³/h)
Flange
mountings
(mm)
Suction connection
Discharge connection
Inner
diameter
Drawing
number
Description
Inner
diameter
Drawing
number
Description
4MTL-05
4.60
45 x 45
5/8"
510-
0823-00
W22 / ODS
5/8
1/2"
510-0809-
00
W17.2 /
ODS 1/2
4MTL-07
6.20
5/8"
W22 / ODS
5/8
1/2"
W17.2 /
ODS 1/2
4MTL-09
7.40
5/8"
W22 / ODS
5/8
1/2"
W17.2 /
ODS 1/2
4MTL-12
9.54
52 x 52
7/8"
510-
0844-00
W30 / ODS
7/8
5/8"
510-0842-
00
W22 / ODS
5/8
4MTL-15
12.50
7/8"
W30 / ODS
7/8
5/8"
W22 / ODS
5/8
4MTL-30
17.90
7/8"
W30 / ODS
7/8
5/8"
W22 / ODS
5/8
4MTL-35
22.70
70 x 70
&
52 x 52
1 ⅜"
510-
0847-00
W42.4 / ODS
1 ⅜
1 ⅛"
510-0845-
00
W35 / ODS
1 ⅛
4MTL-40
26.80
1 ⅜"
W42.4 / ODS
1 ⅜
1 ⅛"
W35 / ODS
1 ⅛
4MTL-50
32.00
1 ⅜"
W42.4 / ODS
1 ⅜
1 ⅛"
W35 / ODS
1 ⅛
Table 6: Shut-off valves for transcritical compressors

AGL_Stream_ST_4MTL_4MSL_EN_Rev02 15
Compressor
Displacement
(m³/h)
Flange
mountings
(mm)
Suction connection
Discharge connection
Inner
diameter
Drawing
number
Description
Inner
diameter
Drawing
number
Description
4MSL-03
4.60
45 x 45
5/8"
510-
0823-00
W22 / ODS
5/8
1/2"
510-0809-
00
W17.2 /
ODS 1/2
4MSL-04
6.20
5/8"
W22 / ODS
5/8
1/2"
W17.2 /
ODS 1/2
4MSL-06
7.40
5/8"
W22 / ODS
5/8
1/2"
W17.2 /
ODS 1/2
4MSL-08
9.54
52 x 52
7/8"
510-
0844-00
W30 / ODS
7/8
5/8"
510-0842-
00
W22 / ODS
5/8
4MSL-12
12.50
7/8"
W30 / ODS
7/8
5/8"
W22 / ODS
5/8
4MSL-15
17.90
7/8"
W30 / ODS
7/8
5/8"
W22 / ODS
5/8
Table 7: Shut-off valves for subcritical compressors
3.3.1 Shut-off valves design
The standard shut-offvalves onStreamCO2 compressorsareflangevalveswithoneflareconnection
port (lockable) for service.The service connection port is a 7/16" –20 UNF, with a blind cap SAE
1/4" (blind cap material: stainless steel 1.4301). The valvesare universal, ie, suitable for brazing or
welding (butt weld and filletweld connectionsare possible).
Figure 19: 3-Dview of shut-off valve
Forpropertighteningtorquesforbolts,spindlecap,blindcapand glandseal,pleasereferto Table 18
inAppendix 2 "Tightening torques in Nm".
The spindle is front-seated (close to piping system) when the compressor is delivered.
3.3.2 Explanation of supplier description
W 13.5 / ODS 3/8"
Outer diametertube for brazing
Brazing
Outer diametertube for welding
Welding
3.3.3 Additional informationabout shut-off valves
CAUTION
High operating pressures! Risk of leakage! High operating pressures must
be taken into accountwhen welding and brazing connections. Use materials
and follow proceduresaccording to the relevant standards in order to prevent
any risk of leakage when operating the compressor.
The shut-off valves are made of a fine-grained mild steel (S235JRG2C –EN10025) suitable for both
welding and brazing. Plating is Fe/Cu5Sn5 material.
The use of standard steel tubes (S235,P235, etc) is possible.
When using stainless steel tubes (SS) the welding consumable has to be selected for dissimilar
materials (stainless steel to mild steel).
For the brazing ofthe connection,brazing material with a minimum silver contentof 34 % (or higher)
in combination with flux material is required, eg, Fontargen A319, A320. The description of the
brazing material according to European standard EN 1044 is AG106 and AG104 respectively.

16 AGL_Stream_ST_4MTL_4MSL_EN_Rev02
In any case the connection area after welding or brazing has to be cleaned and protected against
corrosion.
Valve
description
Mounting
dimensions
(F)
(mm)
Inner Ø
brazing
(d)
(inch)
Thickness
(Z)
(mm)
Dimension
(a)
(mm)
Outer Ø butt
welding
(D)
(mm)
Depth for tube
insertion
(h)
(mm)
PCN
W17.2 / ODS 1/2
45 x 45
1/2"
2.20
3.11
17.2
11.0
W22 / ODS 5/8
45 x 45
5/8"
2.95
4.17
22.0
11.0
W22 / ODS 5/8
52 x 52
5/8"
2.95
4.17
22.0
11.0
W30 / ODS 7/8
52 x 52
7/8"
3.83
5.41
30.0
16.0
W35 / ODS 1 ⅛
52 x 52
1 ⅛"
3.15
4.45
35.0
19.0
W42.4 / ODS 1 ⅜
70 x 70
1 ⅜"
4.20
5.94
42.4
23.0
Table 8: Dimensions for welding and brazing
Figure 20: Dimension references for welding and brazing
3.3.4 Variations for shut-off valves
Compressors can be ordered withoutvalveson request.In that case the valves will be removed and
a blind flange with gasket will be used forsuction and discharge to guarantee the tightness of the
compressor during transport.
For Stream CO2compressors, Emerson also offers variationsfor connection sizes –see Tables 9 &
10 below for details. Additionally,a compression fitting can be used for the dischargepart of the
compressors.Compressorscanbeorderedwith"variationdischargeshut-offvalvewithHy-Lokfitting
at the discharge part". The tube diameterfor the discharge line must be defined bythe customer.
Variation bigger Ø
Compressor
Displ.
(m³/h)
Flange
Mountings
(mm)
Suction connection
Discharge connection
Transcritical
Subcritical
Inner Ø
brazing
Valve
description
Inner Ø
brazing
Valve
description
4MTL-05
4MSL-03
4.60
45 x 45
3/4"
W25.4 /
ODS 3/4
5/8"
W22 /
ODS 5/8
4MTL-07
4MSL-04
6.20
4MTL-09
4MSL-06
7.40
4MTL-12
4MSL-08
9.54
52 x 52
1 ⅛"
W35 /
ODS 1 ⅛
3/4"
W25.4 /
ODS 3/4
4MTL-15
4MSL-12
12.50
4MTL-30
4MSL-15
17.90
4MTL-35
---
22.70
70 x 70
&
52 x 52
1 ⅝"
W48.3 /
ODS 1 ⅝
Not available
4MTL-40
---
26.80
4MTL-50
---
32.00
Table 9: Variations withlarger tube connections
F

AGL_Stream_ST_4MTL_4MSL_EN_Rev02 17
Variation smaller Ø
Compressor
Displ.
(m³/h)
Flange
Mountings
(mm)
Suction connection
Discharge connection
Transcritical
Subcritical
Inner Ø
brazing
Valve
description
Inner Ø
brazing
Valve
description
4MTL-05
4MSL-03
4.60
45 x 45
1/2"
W17.2 /
ODS 1/2
1/2"
W17.2 /
ODS 1/2
4MTL-07
4MSL-04
6.20
4MTL-09
4MSL-06
7.40
4MTL-12
4MSL-08
9.54
52 x 52
5/8"
W22 /
ODS 5/8
1/2"
W17.2 /
ODS 1/2
4MTL-15
4MSL-12
12.50
4MTL-30
4MSL-15
17.90
4MTL-35
---
22.70
70 x 70
&
52 x 52
1 ⅛"
W35 /
ODS 1 ⅛"
7/8"
W30 /
ODS 7/8
4MTL-40
---
26.80
4MTL-50
---
32.00
Table 10:Variations withsmaller tube connections
3.4 Screens
CAUTION
Screen blocking! Compressor breakdown! Use screens with at least
0.6 mm openings.
The use of screens finerthan 30 x 30 meshes (0.6 mmopenings) anywhere in the systemshould be
avoidedwiththesecompressors.Fieldexperiencehasshownthatfinermeshscreensusedtoprotect
thermal expansion valves,capillary tubes or accumulators can become temporarilyor permanently
plugged with normal systemdebris and block the flow of eitheroil or refrigerant to the compressor.
Such blockage can result in compressorfailure.