Emerson Copeland OME-16T Instruction Manual

Application Guidelines
Copeland™CO2Scroll
Refrigeration Units
OME-16T
OMTE-37T to OMTE-64T

AGL_Unit_OMTE_CO2_EN_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 CO2scroll refrigeration unit..............................3
2.2 EU Ecodesign Directive 2009/125/EC...................................................................3
2.3 Main product features and dimensions..................................................................4
2.4 Product nameplate............................................................................................5
2.5 Nomenclature...................................................................................................6
2.6 Application range..............................................................................................6
2.6.1 Qualified refrigerant and oil.......................................................................6
2.6.2 Application limits .....................................................................................7
2.6.3 Recommendations forminimum suctionsuperheat –lubrication conditions ......7
2.6.4 Pressure levels of CO2vs. other refrigerants................................................7
2.7 BOM variations ................................................................................................. 8
2.8 P&Idiagrams....................................................................................................9
2.8.1 Single-compressor CO2scroll refrigeration units...........................................9
2.8.2 Tandem-compressor CO2scroll refrigeration units...................................... 10
2.9 Main componentsdescription............................................................................ 11
2.9.1 Compressor.......................................................................................... 11
2.9.2 Electricalcabinet................................................................................... 12
2.9.3 Liquid receiver...................................................................................... 12
2.9.4 Fan..................................................................................................... 12
2.9.5 High pressure valve (HPV)...................................................................... 13
2.9.6 Bypass valve (BPV)............................................................................... 13
2.9.7 Liquid injectionvalve.............................................................................. 13
2.9.8 Design pressures .................................................................................. 14
2.9.9 Housing............................................................................................... 14
2.10CO2scroll refrigeration unitcontrol –General...................................................... 16
2.10.1 XCPro controller description................................................................... 16
2.10.2 Visotouch display description.................................................................. 16
2.11Howto usethe XCPro controller....................................................................... 18
2.11.1 How to change parameters..................................................................... 18
2.11.2 How to switch the XC Procontroller on/off................................................. 19
2.12XCPro controller –Functionality........................................................................ 20
2.12.1 Suction pressure control......................................................................... 20
2.12.2 Pumpdownmode.................................................................................. 20
2.12.3 Fan speed / gascooler control................................................................. 21

AGL_Unit_OMTE_CO2_EN_Rev01
2.12.4 Alarms................................................................................................. 22
2.13XCPro controller –Peripheral devices................................................................ 22
2.13.1 Variable frequency drive EVM ................................................................. 22
2.13.2 XEV20D Stepper valve actuator............................................................... 23
2.13.3 Circuit breakers..................................................................................... 23
2.14Compressorsafety .......................................................................................... 23
2.14.1 Compressormotor protection.................................................................. 23
2.14.2 High-pressure safety (type-approved pressure limiter)................................. 24
2.14.3 High-pressure safety control.................................................................... 24
2.14.4 Pressure reliefvalve –High-pressureside................................................. 24
2.14.5 Pressure reliefvalve –Liquid receiver....................................................... 25
2.14.6 Low-pressuresafetycontrol.................................................................... 25
2.15Oil managementdevice –OM5 TraxOil™........................................................... 26
3Installation...................................................................................................27
3.1 Refrigeration unit handling................................................................................ 27
3.1.1 Transport and storage............................................................................ 27
3.1.2 Weights............................................................................................... 27
3.1.3 Lifting.................................................................................................. 28
3.2 Refrigerationpiping connections........................................................................ 28
3.2.1 Refrigeration piping installation and connections ........................................ 28
3.2.2 Service ports ........................................................................................ 29
3.2.3 Brazing recommendations ...................................................................... 30
3.2.4 Pressure testing at suction side............................................................... 31
3.3 Electricalconnection........................................................................................ 31
3.3.1 Power supply connections ...................................................................... 32
3.3.2 Electrical wiring..................................................................................... 32
3.3.3 Electrical protection standard (protectionclass).......................................... 32
3.4 Location & fixings............................................................................................ 33
4Start-up & operation....................................................................................35
4.1 Evacuation..................................................................................................... 35
4.2 Charging procedure......................................................................................... 36
4.2.1 Refrigerant charging procedure............................................................... 36
4.2.2 Oil charging procedure........................................................................... 37
4.2.3 Oil separator......................................................................................... 37
4.3 Rotationdirection of scroll compressors.............................................................. 37
4.4 Maximum compressorcycle.............................................................................. 38
4.5 Checksbeforestarting &during operation........................................................... 38
5Maintenance & repair..................................................................................39
5.1 General considerations .................................................................................... 39
5.2 Opening the unit housing.................................................................................. 39
5.2.1 To open the electricalcabinet.................................................................. 39

AGL_Unit_OMTE_CO2_EN_Rev01
5.2.2 To open thecompressor chamber............................................................ 40
5.2.3 To remove the fan safety grid.................................................................. 40
5.3 Replacing a compressor................................................................................... 41
5.4 Gas cooler fins................................................................................................ 41
5.5 Electricalconnections ...................................................................................... 42
5.6Routine leak testing......................................................................................... 42
5.7 Gas cooler fan & motor .................................................................................... 42
5.8 Pressure relief valves....................................................................................... 42
5.8.1 PRV blow-off........................................................................................ 42
5.8.2 Regular maintenance and check.............................................................. 42
5.8.3 PRV replacement on liquid receiver.......................................................... 42
6Certification & approval ..............................................................................44
7Dismantling & disposal...............................................................................44
Appendix 1: XC Pro controller alarm menu...........................................................45
Appendix 2: Temperature / resistance curve for NTC ...........................................46
Appendix 3: Temperature / resistance curve for PTC............................................48
Appendix 4: Ecodesign tables according to Regulation 2015/1095/EU ................50
Appendix 5: List of tables and figures...................................................................51
DISCLAIMER...........................................................................................................52

AGL_Unit_OMTE_CO2_EN_Rev01 1
About these guidelines
The purpose of these application guidelines is to provide guidance in the applicationof Copeland™
CO2scrollrefrigerationunitsforusewithnaturalrefrigerantCO2(R744).Theyare intended toanswer
the questions raised while designing,assembling and operating a systemwith these products.
Besides the support they provide, the instructionslisted herein are also critical for the proper and
safe functioning of the refrigeration unit. The performance and reliability of the product may be
impacted if it is not used according to these guidelinesor is misused.
These application guidelines cover stationaryapplicationsonly.
1 Safety instructions
Copeland refrigeration units are manufactured according to the latest European safety standards.
Particularemphasis has been placed on the user's safety.
The CO2scrollrefrigerationunitsareintendedforinstallationinmachinesand systemsinaccordance
with the European Machinery Directive MD 2006/42/EC, Pressure Equipment Directive
PED 2014/68/EU, Low Voltage Directive LVD 2014/35/EU and Electromagnetic Compatibility
DirectiveEMC2014/30/EU.They may be put to serviceonly if they have beeninstalled 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 both the compressor and the
refrigeration unit.
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 iconindicatesinstructionstoavoid
property damage and possible
personal injury.
High voltage
This icon indicates operations with a
dangerof electricshock.
IMPORTANT
This iconindicatesinstructionstoavoid
malfunction of the compressor.
Danger ofburning 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
dangerof explosion.
1.2 Safetystatements
▪Refrigerant compressorsand refrigeration units must be employed only for their intended
use. The system has to be labelled according to the applicable standards and legislation.
▪Only qualified and authorized HVACR or refrigeration personnel arepermitted 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.
▪Thenationallegislationandregulationsregardingpersonnelprotectionmustbeobserved.
Use personal safety equipment. Safety goggles, gloves,
protectiveclothing,safetybootsand hard hatsshouldbewornwhere
necessary.

2 AGL_Unit_OMTE_CO2_EN_Rev01
1.3 General instructions
WARNING
Pressurized system! Serious personal injuries and/or system
breakdown!Accidentalsystemstartbeforecompleteset-upmustbeavoided.
Never leave the system unattended without locking it out electrically when it is
on vacuum and has no refrigerant charge,when it has a holding charge, or
when the compressorservice valves are closed.
Systembreakdown!Personalinjuries!OnlyCO2and approvedrefrigeration
oils mustbe used.
WARNING
CO2refrigerant! Danger of suffocation! Neverrelease significantvolumes
of CO2ortheentirecontentsofthesystemintoclosedrooms.Incaseofclosed
room, if possible, keep the roomwell ventilated and/or installa CO2detection
device. CO2is odourless and colourless, so it cannot be perceived directly in
case of emission.
WARNING
Earth leakage current! Danger of electric shock! This product cancause
bothACand DCearthleakagecurrent.To protectagainstbothkindsofleakage
current it is recommended to use an AC/DC sensitive RCD type B or B+ on
the power supply side.
WARNING
High surface temperature! Burning! Do not touch the compressor or piping
until they have cooled down.Ensure that other materials in the area of the
compressor do not come into contact with it. Mark and secure accessible
sections.
CAUTION
Overheating! Bearing damage! Do not operate compressors without
refrigerant charge or withoutbeing connected to the system.
CAUTION
Contact with refrigerant oil! Material damage! PAG lubricant must be
handled carefullyand theproperprotectiveequipment(gloves, eyeprotection,
etc.) must be used at all times. PAG must not come into contact with any
surfaceor material that it might damage,includingwithout limitation,certain
polymers,eg,PVC/CPVCand polycarbonate.
IMPORTANT
Transit damage! Compressor and/or unit malfunction! Use original
packaging.Avoid collisions and tilting.
IMPORTANT
This appliance is not designed to be accessible to the general public
according to IEC 60335-2-40.
The contractor is responsiblefor the installation of the unit and should checkthe following points:
▪sufficientliquid sub-cooling in the line to the expansion valve(s) to avoid "flash-gas" in the liquid
line;
▪sufficientamountof oilin the compressor (in case of long piping additional oil must be charged);
▪sufficientamount of oil in the oil separator (the oil levelshould never fall belowthe bottomsight
glass of the oil separator).

AGL_Unit_OMTE_CO2_EN_Rev01 3
2 Product description
2.1 General information about Copeland CO2scroll refrigerationunit
Emerson has developed the Copeland CO2scroll refrigeration unit to meetprimarilythe demands of
the food retail and food service sectors. It is an air-cooled refrigeration unit that uses the latest
Copeland scroll transcritical compressors with inverter. All electronic protection and diagnostics
features, as well as the controls for the refrigeration unit, are builtin the chassis.
Figure 1: Copeland CO2scroll refrigeration units
2.2 EU EcodesignDirective2009/125/EC
The European Directive 2009/125/EC with regard to Ecodesign requirements for professional
refrigerated storage cabinets, blast cabinets, condensing units and process chillers requires
manufacturers to decrease the energy consumption of their products by establishing minimum
energy efficiencystandards. Copeland refrigerationunits areprepared and optimized to meet the
requirements of the Ecodesign Directive.The integrated variable speed fan and gas cooler reduce
the noise level and energy consumption significantly. This, combined with Copeland CO2scroll
compressor technology, allowsforhigh-efficiency operation.
These guidelines meetthe requirements of Regulation (EU) 2015/1095, Annex V, section2(a), with
regard to productinformation,namely:
▪(v) ➔See chapter 2.6 "Application range"
▪(vi) ➔See chapters 5.4 "Gas cooler fins" and 5.6 "Routine leaktesting"
▪(vii)➔See chapter 4.2 "Charging procedure"
▪(viii)➔See chapter 7 "Dismantling & disposal"
The Ecodesign overview tablesaccording to AnnexV ofRegulation 2015/1095 for all Copeland CO2
scroll refrigeration units can be found in Appendix 4.

4 AGL_Unit_OMTE_CO2_EN_Rev01
2.3 Main productfeatures and dimensions
The refrigerationunitscoveredintheseguidelinesarereleased forCO2(R744)refrigerantonly.They
are available in four different sizes and are equipped with oneor two gas cooler fans.
The units are designed for medium temperature applications only. The inverter iscalculated to drive
the compressor in subcriticaland transcriticalapplications.
Refrigeration
unit
Refrigerant
type
Cooling
capacity*
(kW)
Nominal
power
(kW)
Max.
current
(A)
PS
high side
(bar)
PS
low side
(bar)
OME-16T-TFD
R744
13.7
13.85
31
130
90
OMTE-37T-TFD
24.0
24.85
52
OMTE-49T-TFD
32.5
36.7
73
OMTE-64T-TFD
44.4
45.7
89.5
* Cooling capacity declared at ambient temperature 32 °C, gas cooler outlet temperature 35 °C, evaporating
temperature -10 °C, superheat 10 K and variable-speed compressor @ 4800 RPM
Table 1: Copeland CO2scroll refrigeration unittechnical data
Refrigeration
unit
Outer dimensions
length/width/height with
closed e-box (mm)
Weight
(kg)
Liquid receiver
size (litres)
OME-16T-TFD
1851/ 827/ 1405
470
20
OMTE-37T-TFD
3130/ 827/ 1405
600
OMTE-49T-TFD
3500/ 827/ 1410
700
2 x 20
OMTE-64T-TFD
3500/ 827/ 1770
750
Table 2: Copeland CO2scroll refrigeration unit features
The figures hereaftershow theoverall physical dimensions of the Copeland CO2scroll refrigeration
units in millimetres.
Figure 2: Dimensions of CopelandCO2scroll refrigeration unit (OME-16T)–Top view

AGL_Unit_OMTE_CO2_EN_Rev01 5
Figure 3: Dimensions of Copeland CO2scroll refrigeration unit (OME-16T)–Front view
2.4 Product nameplate
The refrigerationunit nameplateshowsmodeldesignationand serialnumber,aswellas rated current
and safety pressures.
The compressor has itsown nameplate with all electrical characteristics.
Figure 4: Nameplate of CopelandCO2scroll refrigeration units

6 AGL_Unit_OMTE_CO2_EN_Rev01
2.5 Nomenclature
The model designation contains the following technical information about Copeland CO2scroll
refrigeration units:
Figure 5: Nomenclature of Copeland CO2 scroll refrigeration units
2.6 Application range
2.6.1 Qualified refrigerant and oil
Qualified refrigerant
R744(CO2)
Qualified servicing oil
PAG ZEROL RFL 68 EP
Unit
OME-16T-TFD
OMTE-37T-TFD
OMTE-49T-TFD
OMTE-64T-TFD
Oil charge
compressors (l)
1.2
2.4
Pre-chargeoil
separator (l)
2.9
2.8
Total oil charge (l)
4.1
5.3
5.2
Table 3: Qualified refrigerantandoil
NOTE: Use only lubricants that are qualified for the product. The use of non-approved
lubricants can damagethe product and will result in loss of warranty!
NOTE: The PAG oil is very hygroscopic. Never keep the system open to the ambient. If for
some reason there is no refrigerant in the system, it is recommended to charge the system
with a protective gas, eg, inertgas N2.
NOTE: Copeland CO2scroll refrigeration units are equipped with an oil separator. This oil
separator is pre-charged with 2.8 / 2.9 liters of oil.
NOTE: Copeland CO2scroll refrigeration units are equipped with one high pressure limiter in
the discharge line. According to EN 378-2, a refrigerant charge of 100 kgof R744 is permitted.
Ifthe system is charged with more than 100 kg, a high-pressure cut-out needs to be installed
for each compressor.
The recommended quality for carbon dioxide purity class is 4.0 [(≥ 99.99 %) H2O ≤ 10 ppm,
O2 ≤ 10 ppm, N2≤ 50 ppm] or higher.
The characterization of R744 (CO2) according to EN 378-1 is safety class A1, not flammable,
ODP = 0 and GWP =1. HighconcentrationsofCO2aredangerous. This refrigerant isodourless and
colourless. Thereforethe use of CO2detectors is required.
CO2is heavier than air. As a result, local concentrations (especially at floor levelor in deeper slots,
ie, in CO2pockets)can behigher than average values in the machine room. The ventilation system
must take thisinto account.

AGL_Unit_OMTE_CO2_EN_Rev01 7
2.6.2 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 unacceptable lubrication conditions.
For the application envelope, please refer to Select software at www.climate.emerson.com/en-gb.
2.6.3 Recommendations for minimumsuction superheat –lubrication conditions
The operation of CO2compressors / units at conditionswhere the viscosity of theoil is low might
becomevery harmfulwith regard to compressor lifetime expectancy. Indicatorslike oil temperature
and discharge temperature must be observed to judge aboutthe lubrication conditions. In general,
higher superheat on the suction inlet of a compressor provides higher safety, butthe limits for the
maximum allowable discharge temperature should be considered as well (superheat has a direct
impact on discharge temperature). For mediumtemperature applications, an absolute minimum of
5 K is recommended.
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 discharge temperature is observed by the unit controller. The temperature on the discharge
line should neverexceed 135 °C. The temperature of the discharge gas directly on the outlet is
10-15 K higherthan the temperature on the discharge line.
2.6.4 Pressure levels of CO2vs. other refrigerants
Figure 6 belowcompares the evaporating pressuresof R744 to those encountered with R410A and
R404A. It can be observed thatR744 systems willrequire to operate at much higher pressures than
conventional systems.
Figure 6: Pressure levelsofCO2
Note that below a pressure of 5.2 bar, solid and gaseous R744 phases may co-exist at low
temperature. This behaviouris totally different fromthat observedwith traditional refrigerants,and
will have importantconsequenceson the operation, servicing and maintenance of a system working
with R744.
Gaseous R744 is 1.5 times heavier than air. Therefore, when released to the air it will concentrate
at lowelevations.
R744 will form "dry ice"at -56.6 °C. One kg of dry ice hasthe cooling capacity of2 kg of ordinary ice.
Gaseous or liquid R744 stored underpressure will formdry ice through an auto-refrigeration process
if rapidly depressurized.

8 AGL_Unit_OMTE_CO2_EN_Rev01
Figure 7 shows the thermodynamic properties (p-h-diagram) of R744. Compared to other fluids
traditionally used as refrigerants, its criticalpoint at 31 °C is very lowand its critical pressure at about
73.6 bar is high.
Figure 7: Pressure/enthalpydiagram CO2
2.7 BOM variations
The BOM(billofmaterial)numberattheend oftheunitdesignationindicatesthedifferentunitlayouts
and details. The CO2scroll refrigeration units covered in these guidelines are available in the
following BOM version:
BOM
Description
500
Compactmodel(gascoolertogetherwith
compressorcompartment)
Table 4: BOM

AGL_Unit_OMTE_CO2_EN_Rev01 9
2.8 P&I diagrams
2.8.1 Single-compressor CO2scroll refrigeration units
Figure 8: P&I diagram of CO2scroll refrigeration unitwith single compressor
Position
Description
Position
Description
1
CopelandCO2scrollcompressor
(variablespeed)
HP
Highpressure limiter
2
CopelandCO2scrollcompressor
(fixedspeed)
INV
Compressorinverter
3
Oil separator
B1
Suctionpressure
4
Gas cooler
B2
Dischargepressure
5
Filter dryer
B3
Liquidreceiverpressure
6
Shut-off valve
B4
Suctiontemperatureunit
7
Liquidreceiver
B5
Suctiontemperaturecompressor
8
Sightglass
B6
Dischargeline temperature
(variable-speed compressor)
9
Pressure relief valve(PRV)
B7
Dischargeline temperature(fixed-
speedcompressor)
10
Solenoidvalve (DVI)
B8
Gas cooleroutlettemperature
11
Solenoidvalve (liquidinjection)
B9
Ambienttemperature
HPV
Highpressure valve
B10
E-boxtemperature
BPV
Bypassvalve
B11
Oil temperature
Table 5: Legendof the P&Idiagram of CO2scroll refrigeration units with single compressor

10 AGL_Unit_OMTE_CO2_EN_Rev01
2.8.2 Tandem-compressor CO2scrollrefrigerationunits
Figure 9: P&I diagram of CO2scroll refrigeration units with two compressors
Position
Description
Position
Description
1
CopelandCO2scrollcompressor
(variablespeed)
HP
Highpressure limiter
2
CopelandCO2scrollcompressor
(fixedspeed)
INV
Compressorinverter
3
Oil separator
B1
Suctionpressure
4
Gas cooler
B2
Dischargepressure
5
Filter dryer
B3
Liquidreceiverpressure
6
Shut-off valve
B4
Suctiontemperatureunit
7
Liquidreceiver
B5
Suctiontemperaturecompressor
8
Sightglass
B6
Dischargeline temperature
(variable-speed compressor)
9
Pressure relief valve(PRV)
B7
Dischargeline temperature (fixed-
speedcompressor)
10
Solenoidvalve (DVI)
B8
Gas cooleroutlettemperature
11
Solenoidvalve (liquidinjection)
B9
Ambienttemperature
HPV
Highpressure valve
B10
E-boxtemperature
BPV
Bypassvalve
B11
Oil temperature
Table 6: Legendof the P&Idiagram of CO2scroll refrigeration units with two compressors

AGL_Unit_OMTE_CO2_EN_Rev01 11
2.9 Main components description
Figure 10: Maincomponents of CO2scroll refrigeration unit(OME-16T)
2.9.1 Compressor
The smallest unit contains one variable-speed compressor. All other units have two compressors.
The first compressoris variable speed and the second one is fixed speed. The compressors are
installed inthecompartment nexttotheelectricalcabinet. Thestandard deliveryis withshut-offvalve
on the suction side as well as with TraxOil™ oil management system connected to the sight glass
connection.
All electrical wiring is pre-assembled in the factory. A pressure relief valve (130 bar) is installed in
the discharge line of the compressors. A pressure limiter is installed on the discharge side of the
compressors in compliance with EN 378 requirements.
The compressors used in each unit model are listed in Table 7 below.
Unit model
Variable-speed
compressormodel
Fixed-speed
compressormodel
OME-16T-TFD
ZTW16AG
-
OMTE-37T-TFD
ZTW16AG
ZTI21AG
OMTE-49T-TFD
ZTW21AG
ZTI28AG
OMTE-64T-TFD
ZTW28AG
ZTI36AG
Table 7: Compressors used in CopelandCO2 scroll refrigerationunits

12 AGL_Unit_OMTE_CO2_EN_Rev01
2.9.2 Electrical cabinet
The electrical cabinetis located next to the the compressor compartment. All electricalcomponents
such as main unit controller, inverter, contactors, transformers, wiring terminals and fuses are
installed in this area.
The electrical cabinet is closed by a door. A fan is activated to controlthe temperature inside the
cabinet. This fan will also be activated if the oil temperature ishigh.The air flow passes through the
compressor compartment as well and coolsdown the oil.
Figure 11: Electrical cabinet (OME-16T)
2.9.3 Liquid receiver
The liquid receiver is installed in the compressor compartment. Its volume is 20 litres for the OME-
16T / OMTE-37Tmodels and 2 x 20 litresfor the OMTE-49 / OMTE-64Tmodels.
The liquid receiver is equipped with a shut-off valve on the inlet and outlet and a safety group
(2 pressure relief valves 90 bar, connected to a switch-over valve).
There are 3 sight glasses in the shell of the liquid receiver to check the refrigerantlevel. The liquid
level must not bebelow thebottomsightglass and not above the top sight glass.
2.9.4 Fan
The gas cooler of the Copeland CO2scroll refrigeration unit isequipped with EC fans.
Fan
Power
input
(W)
Maximum
current
(A)
Air flow
(m3/h)
Unit
Numberof fans
Description
OME-16T-TFD
1
ZN063-ZIL.DG.V7P2
440
4
8809
OMTE-37T-TFD
2
20 - 700
16000
OMTE-49T-TFD
ZN080-ZIL.GG.V7P3
3
21370
OMTE-64T-TFD
28457
Table 8: Fanspecifications

AGL_Unit_OMTE_CO2_EN_Rev01 13
Technical data
Supplyfrequency
Hz
50
Supplyvoltage
V
230forOME-16T / OMTE-37T
400forOMTE-49T / OMTE-64T
Minto maxambient
temperature
°C
-25to +55forOME-16T / OMTE-37T
-25to +70forOMTE-49T / OMTE-64T
ErP 2015
-
Yes
IP class
-
IP54
Fan motortype
-
EC
Fan blades
-
Plastic
Table 9: Fantechnical data
Figure 12: Fan design
2.9.5 High pressure valve (HPV)
The high pressure valve is installed between the gas cooler and the liquid receiver.It controls the
highpressureforoptimumCOPintranscriticaloperation.Insubcriticaloperationitwilladjustthehigh
pressure in order to maintain a certain subcooling.
The driver for the stepper motor valve is installed in the electrical cabinet.
The driver for the HPV is an XEV20D.It gets a signal from the unit controller –see section 2.10
"CO2 scroll refrigeration unit control –General".
2.9.6 Bypass valve (BPV)
The bypass valve is installed between the liquid receiver and the suction line to the compressor. The
bypass valve is aimed at keeping the liquid receiver pressure below the maximum allowed injection
pressure of the compressor at all times.
2.9.7 Liquid injectionvalve
The liquid injection valve is installed between the liquid line and the suction line. The purpose ofthis
valve is to inject liquid refrigerant to thesuction line in order to keep the superheat atthe compressor
inlet below 20 K and the discharge temperature below 135 °C.

14 AGL_Unit_OMTE_CO2_EN_Rev01
2.9.8 Design pressures
IMPORTANT
Piping designpressure! Risk of CO2 blow-off! The CO2scroll refrigeration
unit liquid and suction line piping is designed for a design pressure (PS) of
90 bar as pressures around 85 barcanoccur during normal operation. The
installer must always consider the systemliquid and suction lines in terms of
maximum operating pressure. If the system piping design pressure (PS) is
lower than 90 bar, additional safety devices are required. The minimum
required design pressure (PS) for the liquid and thesuction line is80 bar.
The unit has 2 different pressure areas:
▪The design on suction side is made for a maximum allowable absolute pressure of 90 bar at
standstill.The section after the high pressure valve to the liquid line outletof the unitis approved
for an absolute pressure of 90 bar at standstill,too.
▪The area with discharge pipe,gas cooler and high pressure valve is approved for a maximum
allowable absolute pressure of 130 bar.
Figure 13: Design pressures of CopelandCO2 scroll refrigerationunits
NOTE:ThedesignpressurePSisasafety-relatedvalue.Therestrictionsforreliableoperation
of the unitare defined by the application envelope which can be found in Select software at
www.climate.emerson.com/en-gb.
2.9.9 Housing
Copeland CO2scroll refrigeration units have a new, unique design. They are equipped with an
electrical cabinet located next to the compressor compartment. The electrical cabinet has a door for
easy and service-friendly access. Thecompressorcompartmentand electricalcabinet areaccessible
independently.The fans havehorizontal air flow and are protected by a safety grid. The gas cooler
and connected parts are freely accessiblebythe service technician. The figure below shows the
housing of unitmodel OMTE-37T-TFD. The housing design differs slightly in the other unitmodels.
Figure 14: Overview ofthe unit housing

AGL_Unit_OMTE_CO2_EN_Rev01 15
Figure 15: Liquidline and suctionline
Figure 16: Mainswitchand power supply cable gland