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_E_Rev01
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 General information about Copeland™Stream CO2 semi-hermetic compressors for
transcritical and subcritical applications................................................................................... 3
2.2 Nomenclature................................................................................................................... 4
2.3 Nameplate information..................................................................................................... 4
2.4 Application range ............................................................................................................. 5
2.4.1 Qualified refrigerant and oil.................................................................................. 5
2.4.2 Application limits................................................................................................... 5
2.4.3 Recommendations for minimum suction superheat –Lubrication conditions...... 6
2.5 Design features................................................................................................................ 7
2.5.1 Compressor construction ..................................................................................... 7
2.5.2 Compressor cooling ............................................................................................. 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 ................................................................................................ 13
3.2.1 Safety relief valves............................................................................................. 13
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-off valves design........................................................................................ 15
3.3.2 Explanation of supplier description .................................................................... 15
3.3.3 Additional information about shut-off valves ...................................................... 15
3.3.4 Variations for shut-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

AGL_Stream_ST_4MTL_4MSL_E_Rev01
4.2.2 Part-winding motors (YY/Y) –Code F................................................................ 18
4.2.3 Star / Delta motors (Y/∆) – Code E .................................................................... 18
4.2.4 Terminal box isolators and jumpers position...................................................... 19
4.3 Wiring diagrams............................................................................................................. 20
4.3.1 Compressors with Next Generation CoreSense module ................................... 20
4.3.2 Compressors with CoreSense Protection module ............................................. 22
4.3.3 Compressors with CoreSense Diagnostics module........................................... 24
4.4 Protection devices.......................................................................................................... 26
4.5 Next generation CoreSense™....................................................................................... 26
4.5.1 Next Gen CoreSense specifications .................................................................. 26
4.5.2 Next Gen CoreSense features........................................................................... 26
4.6 CoreSense™ Protection................................................................................................ 27
4.6.1 Motor protection ................................................................................................. 27
4.7 CoreSense™ Diagnostics (until December 2019 included) .......................................... 28
4.8 Crankcase heater........................................................................................................... 29
5Start-up & operation.......................................................................................31
5.1 Leak test......................................................................................................................... 31
5.2 System evacuation......................................................................................................... 31
5.3 Preliminary checks –Pre-starting.................................................................................. 31
5.4 Charging procedure....................................................................................................... 32
5.5 Initial start-up ................................................................................................................. 32
5.6 Minimum run time .......................................................................................................... 32
5.7 Inverter operation........................................................................................................... 33
5.7.1 Maximum Operating Current –Models 4MTL-35 to 4MTL-50........................... 33
5.7.2 Recommendations for use with an inverter........................................................ 33
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: Correct T-plate isolators depending on motor version & power
supply.........................................................................................................................40
Disclaimer ..................................................................................................................41

AGL_Stream_ST_4MTL_4MSL_E_Rev01 1
About these guidelines
The purpose of these application guidelines is to provide guidance in the application of Copeland™
Stream semi-hermetic compressors 4MTL* and 4MSL*. They are intended 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 for the proper and
safe functioning of the compressors. Emerson will not guarantee the performance and reliability of
the product if it is misused in regard of these guidelines.
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 has been placed on the user’s safety.
These compressors are intended for installation in systems according to the Machinery Directive
MD 2006/42/EC. They may be put to service only if they have been installed in these systems
according to instructions and conform to the corresponding provisions of legislation. For relevant
standards please refer to the Manufacturer’s Declaration, available at www.climate.emerson.com/en-
gb.
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
This icon indicates instructions to avoid
property damage and possible
personal injury.
High voltage
This icon indicates operations with a
danger of electric shock.
IMPORTANT
This icon indicates instructions to avoid
malfunction of the compressor.
Danger of burning or frost burn
This icon indicates operations with a
danger of burning or frost burn.
NOTE
This word indicates a recommendation
for easier operation.
Explosion hazard
This icon indicates operations with a
danger of explosion.
1.2 Safety statements
▪Refrigerant compressors must be employed only for their intended use.
▪Only qualified and authorized HVAC or refrigeration personnel are permitted to install,
commission and maintain this equipment.
▪Electrical connections must be made by qualified electrical personnel.
▪All valid standards for connecting electrical and refrigeration equipment must be
observed.
▪The national legislation and regulations regarding personnel protection must be observed.
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_E_Rev01
1.3 General instructions
WARNING
System breakdown! Personal injuries! Never install a system in the field
and leave it unattended when it has no charge, a holding charge, or with the
service valves closed without electrically locking out the system.
System breakdown! Personal injuries! Only approved refrigerants and
refrigeration oils must be used.
WARNING
CO2refrigerant! Danger of suffocation! Never release significant volumes
of CO2or the entire contents of the system into closed rooms. In case of closed
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 until it has
cooled down. Ensure that other materials in the area of the compressor do not
get in touch with it. Lock and mark accessible sections.
CAUTION
Overheating! Bearing damage! Do not operate compressor without
refrigerant charge or without it being connected to the system.
CAUTION
Contact with POE! Material damage! POE lubricant must be handled
carefully and the proper protective equipment (gloves, eye protection, etc.)
must be used at all times. POE must not come into contact with any surface
or material that it might damage, including without limitation, certain polymers,
eg, PVC/CPVC and polycarbonate.
IMPORTANT
Transit damage! Compressor malfunction! Use original packaging. Avoid
collisions and tilting.

AGL_Stream_ST_4MTL_4MSL_E_Rev01 3
2 Product description
2.1 General information about Copeland™Stream CO2 semi-hermetic compressors
for transcritical and subcritical applications
These guidelines cover Copeland™Stream CO2 semi-hermetic compressors. The Stream CO2
series of 4MTL* transcritical models ranges from 5 to 50 hp; the series of 4MSL* subcritical models
ranges from 3 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
Net weight
(kg)
Footprint
(mm x 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 and performance at full load (100 %)
Table 2 shows the key pressure values that are relevant to the use of Stream CO2compressors.
Compressor
Motor
Maximum operating
pressure (MOP)
(bar(a))
Standstill pressure
(nameplate)
PS / PSS (bar(a))
Burst
pressure
(bar(a))
4MTL-05_
EWL
FWM/D
FWE / FWC
120 / 50.9
135 / 90
420 / 287
4MTL-07_
4MTL-09_
4MTL-12_
AWM/D
EWL
AWE
120 / 50.9
135 / 90
420 / 287
4MTL-15_
4MTL-30_
120 / 42
4MTL-35_
AWM
EWL
AWE
110 / 42
135 / 90
420 / 287
4MTL-40_
4MTL-50_
4MSL-03_
EWL
FWM/D
FEW / FWC
60 / 23
135 / 90
420 / 287
4MSL-04_
4MSL-06_
4MSL-08_
AWM/D
EWL
AWE
60 / 23
135 / 90
420 / 287
4MSL-12_
4MSL-15_
Table 2: Stream CO2compressor pressures
The line-up of 4-cylinder semi-hermetic Stream compressors for CO2transcritical applications is the
ideal solution for R744 medium temperature section of booster systems. This range is designed for

4 AGL_Stream_ST_4MTL_4MSL_E_Rev01
maximum standstill pressures of 135 bar at high side and 90 bar at low side –see Chapter 3.2.1
"Safety relief valves". Refrigerant flow and heat transfer have been optimized for best performance.
NOTE: Throughout these guidelines, pressure values shown with the bar(a) or bar unit are
absolute pressures. For values in relative (gauge) pressure, bar(g) will be used.
NOTE: The compressor is only one component which must be combined with many others to
build a functional and efficient refrigeration system. Therefore the information in this manual
relates to Copeland Stream semi-hermetic compressors for CO2transcritical and subcritical
applications with standard equipment and accessories only.
2.2 Nomenclature
The model designation contains the following technical information about Stream CO2compressors:
Figure 1: Nomenclature
* The oil type is indicated on the nameplate –see Chapter 2.3 "Nameplate information". Several oils
are qualified –see Chapter 2.5.1 "Qualified refrigerant and oils".
2.3 Nameplate information
All important information for identification of the compressor is printed on the nameplate located
below the left cylinder bank:
▪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 or PAG.
Figure 2: Nameplate information
20C = Produced in March 2020
POE68 = Oil type
R744 = CO2refrigerant

AGL_Stream_ST_4MTL_4MSL_E_Rev01 5
2.4 Application range
2.4.1 Qualified refrigerant and oil
Stream CO2compressors are delivered with POE oil. Large models (4MTL-35 to 4MTL-50) can
alternatively be delivered on request with PAG oil.
Oil recharge values can be taken from Copeland™brand products Select software available at
www.climate.emerson.com/en-gb.
Qualified refrigerant
R744 (CO2)
Copeland brand
products standard oils
Emkarate RL 68 HB (POE 68)
Zerol RFL 68 EP (PAG 68)*
Qualified servicing oils
Emkarate RL 68 HB (POE 68)
Zerol RFL 68 EP (PAG 68)*
Factory oil 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
2.5
* Optional and for large models only
Table 3: Qualified refrigerant and oils & factory oil charges
To recharge:
▪When the compressor is completely empty of oil, the amount of oil to be "recharged" is typically
0.12 litre less than the original oil charge (oil will already be present in the system).
To top up:
▪During commissioning, planned maintenance or servicing, add oil so that the compressor oil level
is between min ¼ and max ¾ of side sight glasses and full in 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! Low suction
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 operating envelopes of transcritical and subcritical StreamCO2compressors are shown below.
Figure 3: Operating envelopes for transcritical applications with R744 –Models 4MTL-05 to 4MTL-15

6 AGL_Stream_ST_4MTL_4MSL_E_Rev01
Figure 4: Operating envelopes for transcritical applications with R744 –Models 4MTL-30 to 4MTL-50
Figure 5: Operating envelope for subcritical applications with R744 –Models 4MSL-03 to 4MSL-15
2.4.3 Recommendations for minimum suction superheat –Lubrication conditions
The operation of CO2compressors at conditions where the viscosity of the oil is low might become
very harmful with regard to compressor lifetime expectancy. Indicators like oil temperature and
discharge temperature must be observed to judge about the lubrication conditions. Depending on
the application (low temp, medium temp, parallel compression, etc.) different minimum suction
superheat values have to be respected to secure maximum protection of the compressor. In general,
higher superheat on the suction inlet of a compressor provides higher safety, but the limits for the
maximum allowable discharge temperature have to be considered as well (superheat has a direct
impact on the discharge temperature).
Particular attention should be paid to the following points:
▪Measuring the suction superheat becomes more critical with larger diameters on the suction tube.
Ensure proper positioning of sensor. Sensor sleeves must be used with large diameters.
▪The oil temperature is measured 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 CoreSense Diagnostics
module. If an additional sensor is applied to the discharge line (as close as possible to the

AGL_Stream_ST_4MTL_4MSL_E_Rev01 7
discharge shut-off valve) the temperature is expected to be 15-20 K lower than inside the cylinder
head. This fact must be taken into account when applying the values in Table 4 below.
Application
Minimum
superheat
required
Minimum oil
temperature
required
Maximum acceptable discharge
temperature
Stream
Scroll
Low temp
20 K / 36 °F
30 °C / 86 °F
154.4 °C / 310 °F
121.1 °C / 250 °F
Medium temp
10 K / 18 °F
30 °C / 86 °F
154.4 °C / 310 °F
N/A
Compressors in parallel
or multi-compressors
10 K / 18 °F
30 °C / 86 °F
154.4 °C / 310 °F
N/A
Table 4: Superheat recommendations
Attention! The values shown in Table 4 are maximum temperature values inside the cylinder head.
When using a discharge temperature sensor on the discharge line, the temperature drop has to be
considered for the high DLT cut-out setpoint.
NOTE: An additional internal heat 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 plenum are designed to minimize the heat transfer 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
Compressor motor cooling must be ensured in all circumstances.
All Stream CO2 compressors are suction gas-cooled. With suction gas-cooled compressors, the
motor is cooled by refrigerant gas that is led through / over the motor. Depending upon the operating
conditions, the maximum allowed suction gas superheat shall not exceed 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 constant or variable speed.
For large models (4MTL-35 to 4MTL-50) an oil pump is used:
▪On compressors with Next Generation CoreSense™(-N) or formerly delivered with CoreSense™
Diagnostics (-D), the oil pump integrates an electronic switch to ensure the oil pressure safety
functionality.
▪Compressors with CoreSense™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 on these compressors are independent of their rotating direction.

8 AGL_Stream_ST_4MTL_4MSL_E_Rev01
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 (3)
Figure 7: Sight glasses location on small and medium models
Large models (4MTL-35 to 4MTL-50) are equipped with 2 sight glasses.
Figure 8: Sight glasses & oil sensor on large models
All compressors are delivered with sufficient oil for normal operation –see Table 3. The optimum oil
level should be checked by operating the compressor until the system is stable and then comparing
the sight glass reading with the corresponding diagram below. The oil level should be min ¼ and
max ¾ of the side sight glasses and full in the housing cover sight glass.
The housing cover sight glass serves only as a means of checking the oil level in the compressor
crankcase and cannot be used for its control.
When an oil regulator is used, it has to be installed in place of one of the side sight glasses. The oil
level should be min ¼ and max ¾ of the sight glass. The level can also be checked within 10 seconds
of compressor shutdown.
For 4MTL* and 4MSL* compressors, a higher oil level may be accepted when an oil regulator is used
as the oil separator will reduce excessive oil circulation.
The sight glass thread is 1 1/8"-18 UNEF, and the tightening torque is 50 to 60 Nm.

AGL_Stream_ST_4MTL_4MSL_E_Rev01 9
Figure 9: Sight glass design Figure 10: Sight glass reading
For small- and medium-size compressors, as they do not have an oil pump, an oil pressure safety
control cannot be used to protect the compressor against lubrication problems. However, a float level
switch for oil can be used to protect the compressor against oil loss.
2.5.4.1 Oil level management device OM5 TraxOil
Active oil level management is a must in order to ensure reliable compressor operation, in particular
in refrigeration applications with varying operating conditions and defrost cycles. An additional benefit
of active systems is that, in addition to oil balancing, they normally also monitor the 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 float changes 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 oil level management systems,
especially in 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 CO2compressors when
necessary.
The oil level control is divided into 3 zones: normal,
warning and alarm.
More information about this product can be found
at www.climate.emerson.com/en-gb.
2.5.4.2 Oil level monitoring system OW4/OW5 TraxOil
The OW4 and OW5 TraxOil are intended for systems which only require oil level monitoring and
alarming and do not need active oil level balancing.
▪OW4 is designed for CO2subcritical applications
▪OW5 is designed for CO2transcritical applications
Figure 12: OW4/OW5 TraxOil for oil level monitoring
The level control is divided into 3 zones: normal, warning and alarm.
Figure 11: TraxOil OM5 with sight glass & coil

10 AGL_Stream_ST_4MTL_4MSL_E_Rev01
If the oil level drops into the red zone, the OW4/OW5 generates an alarm signal and the alarm contact
(SPDT) changes into alarm state. The alarm contact may be used to shut down the compressor. The
alarm will be reset when the oil 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_E_Rev01 11
3 Installation
WARNING
High pressure! Injury to skin and eyes possible! Be careful when opening
connections on a pressurized item.
3.1 Compressor handling
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, oil sight glasses
▪Crankcase heater 230 V
▪Mounting parts kit (rubber)
▪Next Generation CoreSense™, CoreSense™Diagnostics or CoreSense™Protection module
▪Holding charge up to 2.5 bar(g) (dry air)
▪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 transport and storage
NOTE: The compressor is pre-charged with dry air to 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 reasons two 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 other accessories.

12 AGL_Stream_ST_4MTL_4MSL_E_Rev01
Figure 14: Compressor lifting
3.1.4 Installation location
Ensure the compressors are installed on a solid level base. Horizontal installation 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 impulses flexible mounting should be used. For this purpose,
one set of rubber mounting parts for each of the Stream models is delivered with each 4MTL* and
4MSL* 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 will be transmitted to the frame. Use only the compressor foot for fixation and avoid
direct contact of other parts of the compressor housing with bordering components or base frame.
Unevenness in the mounting surface will have to be compensated by the rack and/or the compressor
bottom plate/feet. Excessive unevenness can result in too high mechanical stress to the system and
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.
Locknut
Washer
Rubber spacer
Body mounting foot
Rubber spacer
Rubber pad
Spacer
Screw hex head

AGL_Stream_ST_4MTL_4MSL_E_Rev01 13
3.2 Pressure safety controls
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 compressor is fitted with a pressure relief valve on the discharge side (135 bar, factorymounted).
If excessive pressures are reached, the valve opens and prevents further pressure increase. CO2is
then blown off to the ambient.
An optional pressure relief valve (90 bar) is available for the suction side. Typically the suction side
of the system is 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
Usually after a blow-off, pressure relief valves are never perfectly tight. It is therefore recommended
to replace the pressure relief valves after any blow-off.
The following pictures show the position of the pressure relief valve (high side) and the position of
the plug (low side).
Figure 16: Position of the pressure relief valve –Models 4MTL-12 to 4MTL-30 & 4MSL-08 to 4MSL-15
Figure 17: Position of the pressure relief valve –Models 4MTL-05 to 4MTL-09 & 4MSL-03 to 4MSL-06
PRV (high side)
PRV (high side)
Plug (low side)
Plug (low side)

14 AGL_Stream_ST_4MTL_4MSL_E_Rev01
Figure 18: Position of the pressure relief valve –Models 4MTL-35 to 4MTL-50
3.2.2 Maximum allowable pressures PS
The maximum allowable pressures PS according to EN 12693 are shown on the compressor
nameplate; they are obligatory and must not be exceeded.
▪For transcritical applications: 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 Chapter 2.4.2 "Application
limits" have to be respected during compressor operation. Running a compressor outside the
envelope could lead to compressor breakdown and/or system failure.
The position of the HP and LP connections is shown in Appendix 1 "Stream compressor
connections". It is recommended to connect the pressure cut-out devices directly to the compressor
housing. For the high-pressure cut-out switch, one of the connection ports "4" can be used –see
Appendix 1 "Connections of Stream CO2 compressors". For the low-pressure cut-out connection,
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 brand products 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-off valves are suitable for 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_E_Rev01 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-off valves on Stream CO2 compressors are flange valves with one flare connection
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 valves are universal, ie, suitable for brazing or
welding (butt weld and fillet weld connections are possible).
Figure 19: 3-D view of shut-off valve
For proper tightening torques for bolts, spindle cap, blind cap and gland seal, please refer to table in
Appendix 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 diameter tube for brazing
Brazing
Outer diameter tube for welding
Welding
3.3.3 Additional information about shut-off valves
CAUTION
High operating pressures! Risk of leakage! High operating pressures must
be taken into account when welding and brazing connections. Use materials
and follow procedures according 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 –EN 10025) 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 of the connection, brazing material with a minimum silver content of 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.
In any case the connection area after welding or brazing has to be cleaned and protected against
corrosion.

16 AGL_Stream_ST_4MTL_4MSL_E_Rev01
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 without valves on request. In that case the valves will be removed and
a blind flange with gasket will be used for suction and discharge to guarantee the tightness of the
compressor during transport.
For Stream CO2compressors, Emerson also offers variations for connection sizes –see Tables 9 &
10 below for details. Additionally, a compression fitting can be used for the discharge part of the
compressors. Compressors can be ordered with "variation discharge shut-off valve with Hy-Lok fitting
at the discharge part". The tube diameter for the discharge line must be defined by the 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 with larger tube connections
F

AGL_Stream_ST_4MTL_4MSL_E_Rev01 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 with smaller tube connections
3.4 Screens
CAUTION
Screen blocking! Compressor breakdown! Use screens with at least
0.6 mm openings.
The use of screens finer than 30 x 30 meshes (0.6 mm openings) anywhere in the system should be
avoided with these compressors. Field experience has shown that finer mesh screens used to protect
thermal expansion valves, capillary tubes or accumulators can become temporarily or permanently
plugged with normal system debris and block the flow of either oil or refrigerant to the compressor.
Such blockage can result in compressor failure.