Copeland™ Scroll ZXV
variable speed condensing unit
for refrigeration applications
User manual
ZXV condensing
unit
Emerson is pleased to offer the ZXV/ZXLV variable speed condensing units from ZX platform, especially
designed for refrigeration applications.
Overall, ZX platform CDU (ZX and ZXB medium temperature, ZXL low temperature, ZXD/ZXLD digital
modulated capacity medium temperature and low temperature, ZXV/ZXLV variable speed medium
temperature and low temperature refrigeration) has been highly successful in the Asian market and enjoys
proven success with its energy savings and customer-friendly electronic features.
Table of contents
Disclaimer
Features and benefits
Nomenclature
Bill of material
Physical layout of the unit
ZXV Product specification
Qualified refrigerants and oils
Operating envelopes
Performance data
Technical data
CoreSense controller
Network wiring
Installation
04
05
05
05
06
08
08
08
09
11
12
17
19
Condensing unit handling
Electrical connection
Refrigeration piping installation
Liquid line insulation
Brazing recommendations
Location and fixing
Start up and operation
Vacuuming
Charging procedure
Check before starting & during operation
ZXV do’s and don’ts
Alarm codes
Wiring diagrams
19
19
20
20
20
21
21
21
21
22
22
23
27
Temperature sensor resistance
Contact lists
27
32
ZXV condensing unit
for refrigeration applications
Disclaimer
Thank you for purchasing the ZXV condensing unit from
Emerson. ZX platform CDUs are the best in class within the
capacity and operating range available in the market. ZX CDU
is designed to operate reliably and to deliver high operating
efficiencies in medium and low temperature refrigeration
applications. It also provides constant monitoring of the
compressor operating conditions and displays the running
or fault conditions of the CDU. ZX platform CDUs have to be
installed by following the industry trade practices for its safe
and reliable operation. It is assumed that the CDU is selected,
installed and serviced only by professionals. The user manual
does not cover good industry practices which are essential on a
refrigeration equipment installation. No responsibility can be
accepted for damage caused by inexperienced or inadequately
trained site technicians or improper installation design.
If in doubt, please consult your local sales office, quoting unit
model and serial number as shown on each unit nameplate. In
case of any ambiguity, the wiring diagram supplied with each
unit takes precedence over the diagram in this manual.
Introduction to ZX platform CDU
ZX and ZXB medium temperature, ZXL low temperature,
ZXD/ZXLD digital modulated capacity medium temperature
and low temperature, ZXV/ZXLV variable speed medium
temperature and low temperature series have been highly
successful in the Asian market and enjoys proven success with
its energy savings and customer-friendly electronic features.
ZX platform CDUs have been applied by several well-known
end-users and chain retailers throughout Asia. The ZX
platform is also gaining wider acceptance in the global market
and specific variants have been developed and exported to the
US, European and Middle East markets.
Receiving your unit
All units are shipped with a holding charge of dry nitrogen
inside at a low but positive pressure. Suitable labeling is
prominently displayed on both the unit and the packaging.
Service connectors are provided on the CDU service valve for
the convenient checking of the integrity of the holding charge.
Caution!It is very important to check that this holding
pressure exists at the time you receive each unit from us or our
authorized representatives. Please inform us or our authorized
representative if the holding charge is non-existent. Failure to
do so could void the claim for other related system faults at a
later period.
4
Transit damage is essentially an insurance claim and is not
covered under manufacturing defect. It is also advisable to
inspect the rest of the unit for obvious physical damage and
inform us or our authorized representative in case any is
discovered.
ZX platform condensing unit was designed based
on three factors demanded by industry users
Intelligent Store™ solution - A most innovative
approach to enterprise facility management, Intelligent Store
by Emerson architecture integrates hardware and services,
to provide retailers a single view into their entire network of
facilities and understanding what facilities actually cost to
operate and maintain.
The Intelligent Store architecture transforms data from store
equipment and controls into actionable insights. Designed to
deliver value in both new and existing stores, Emerson aims to
help the retailers:
• Make better decisions on recourse investment for
greatest impact
• Gain accurate feedback and customized service for your
specific needs
• Reduce operational costs and boosting profitability
Energy efficiency- Utilizing Copeland™ scroll compressor
technology, variable speed fan motor, large capacity condenser
coil and advanced control algorithms, energy consumption
is significantly reduced. End-users can save more than 20%
on annual energy costs compared to than using hermetic
reciprocating units.
Reliability - Combining the proven reliability of Copeland
scroll compressors with advanced electronic controllers and
diagnostics, equipment reliability is greatly enhanced. Fault code
alerts and fault code retrieval capabilities provide information
to help improve speed and accuracy of system diagnostics.
Integrated electronics provide protection against over-current,
over-heating, incorrect phase rotation, compressor cycling,
high pressure resets, low pressure cut-outs. It can also send
out a warning message to an operator when there is a liquid
floodback, which can prevent critical damage on the unit.
Intelligent store
Highest efficiency
Reliability
Better decision making
Lower energy bills
Lower maintenance cost
ZXD, ZXLD, ZXV Family
Capacity modulation digital and
variable speed to control precise
room or showcase temperature
Design features:
• With real time monitoring of compressor
operating conditions
• Compressor reverse rotation protection
• Compressor over current protection
• Compressor internal motor protector trip
• Discharge gas over heat protection
• Over voltage protection
• Under voltage protection
• High pressure cut out
• Low pressure cut out
• Refrigerant flood back protection
• Compressor minimum off time protection
• Internal thermal sensor failure
• Intelligent Store solution:
Communication and retail store monitoring
•Thermal overload protection
ZXV nomenclature
ZX, ZXB and ZXL Family
Proprietary electronic algorithms present advantage on
diagnose, communication, and protection purposes. They
are also fundamental to control fan speed, optimizing energy
performance for local seasonal ambient temperatures
Figure 1. ZXV CDU features
Drive assembly
• High reliability with good cooling
• Easy service with quick connectors
Good harmonic with choke
Optimized condenser coil for
maximum heat transfer
Variable speed fan motor and high
efficiency fan blade
Copeland™ Scroll compressor technology
High efficiency, ultra quiet, high reliability
Enhanced vapor injection
• Improved efficiency
• Combined DLT protection
ZXV065BE
E = R404A, POE oil
Condensing platform
V = Medium temp variable speed
LV = Low temp variable speed
Maximum capacity*
B = Next generation
P = R410A, POE oil
Base modelElectrical code
Note: *Maximum capacity condition of evap temp/amb temp/return gas temp
Medium temp -10°C/40°C/18.3°C
Low temp -32°C/40°C/5°C
Bill of material
ZXV BOM
Liquid line filter drier
Moisture indicator
Oil separator
Accumulator
Suction pressure transducer
Fixed HP switch
Fixed LP switch
Adjustable LP switch
CoreSense & Intelligent Store
Fan speed control
Circuit breaker
Sound jacket
Note: *Accumulator is shipped in loose packing for single fan ZXLV units
• The rating condition is based on a return gas temperature of 5°C.
• Power includes condenser fan.
• Ambient 38°C and 43°C are typical design conditions for unit selection.
9
Technical data
Medium temperature
FamilyZXV
Model nameZXV065BEZXV085BEZXV130BE
RefrigerantR404A, R448A
Evaporating temperature range°C-20°C ~ 5°C
Ambient range°C-25°C ~ 48°C
Maximum Capacity-10°C ET/40°C AT/18°C RGTkW6.58.513.0
Performance
Unit
Fan Motor
(R404A)
Sound
Compressor
For 4XD
Model
For 4XK
Model
Others
Note: 1 Preliminary data
Nominal Capacity
Nominal COPW/W2.442.322.28
Nominal SpeedRPM4500 RPM4500 RPM4500 RPM
RLA (Rated load amps)A4.56.28.0
MOC (Max. Operating Current)A10.414.016.0
Sound Pressure Level @ 1m
Sound Pressure Level @ 1m
Model NameZBW030DE-4X9ZBW038DE-4X9ZBW050SE-4X9
Max Input AmpereAmp152227
Oil TypeAmpPOEPOEPOE
Oil Charge VolumnLiters1.631.631.60
Speed RangeRPM1800 - 60001800 - 60001800 - 6000
Number of Fan112
Diametermm450450450
Max SpeedRPM830830830
Max FlowTot alm3/h292229225910
Max Fan Motor PowerInputW116116246
Number of Fan112
Diametermm450450450
Max SpeedRPM933933933
Max FlowTot alm3/h348334836966
Max Fan Motor PowerInputW145145290
Oil SeperatorVolumeLiters0.50.50.5
Receiver Volumnkg4.34.36.3
PipesSuction ODInch3/43/47/8
DimensionW X H X Dmm1029 x 424 x 8401029 x 424 x 8401029 x 424 x 1242
WeightNetkg101104136
-10°C ET/32°C AT/18°C RGT
1
1
At Part LoaddB(A)52-5852-5855-59
At Full LoaddB(A)616163.0
Liquid ODInch1/21/21/2
Grosskg139139180
kW6.17.910.0
Low temperature
FamilyZXLV
Model nameZXLV030BEZXLV040BEZXLV050BE
RefrigerantR404A, R448A
Evaporating temperature range°C-40°C ~ 0°C
Ambient range°C-25°C ~ 48°C
Maximum Capacity-32°C ET/40°C AT/5°C RGTkW3.204.105.04
Unit
Compressor
Fan Motor
Performance
(R404A)
For 4XD
For 4XK
Others
Sound
Model
Model
Nominal Capacity
Nominal COPW/W1.241.201.18
Nominal SpeedRPM4500 RPM4500 RPM4500 RPM
RLA (Rated load amps)3.95.06.3
MOC (Max. Operating Current)A9.412.615.3
Sound Pressure Level @ 1m
Sound Pressure Level @ 1m
Model NameZFW030DE-4X9ZFW038DE-4X9ZFW050SE-4X9
Max Input AmpereAmp152227
Oil TypeAmpPOEPOEPOE
Oil Charge VolumnLiters1.631.631.60
Speed RangeRPM1800 - 60001800 - 60001800 - 6000
Number of Fan112
Diametermm450450450
Max SpeedRPM830830830
Max FlowTot alm3/h292229225910
Max Fan Motor PowerInputW116116246
Number of Fan112
Diametermm450450450
Max SpeedRPM933933933
Max FlowTot alm3/h348334836966
Max Fan Motor PowerInputW145145290
Oil SeperatorVolumeLiters0.50.50.5
Receiver Volumnkg4.34.36.3
PipesSuction ODInch3/43/47/8
DimensionW X H X Dmm1029 x 424 x 8401029 x 424 x 8401029 x 424 x 1242
WeightNetkg101104136
-32°C ET/32°C AT/5°C RGT
1
1
At Part LoaddB(A)52-5852-5855-59
At Full LoaddB(A)616163.0
Liquid ODInch1/21/21/2
Grosskg139139180
kW2.643.344.16
Note: 1 Preliminary data
10
Start
CoreSense controller
LED descriptions
LEDStatusDescription
ONCompressor1 is running
1
FlashingCompressor1 is ready to start
ONReserved
2
FlashingReserved
ONCondensing fan is running
ONReserved
ONDisplay with °C
FlashingProgrammable mode
Keyboard descriptions - single button
LEDStatusDescription
ONBrowsing the service menu
FlashingBrowsing the fast access menu
ONA new alarm happened
!
FlashingBrowsing the alarm menu
!
ONAn alarm is occurring
ONReserved
-Reserved
SetDisplay target set point; In programming mode, select a parameter or confirm an operation.
Reset
Up
DownIn programming mode it browses the parameter codes or decreases the displayed value.
ServiceEnter the service and alarm menu.
Defrost
Hold for 5 seconds to reset any lockouts if the current state of the controller allows for it to be
reset.
Enter the fast access menu; In programming mode, browse the parameter codes or
increases the displayed value.
Hold for 3 seconds to start a manual defrost or terminate an active defrost.
(Not available at the moment).
11
Keyboard descriptions - combined buttons
+
+
+
+
Press and hold for about 3 seconds to lock (Pon) or unlock (PoF) the keyboard.
Pressed together to exit programming mode or menu; under rtC and Par, this combination allows the user to go
back to previous level.
Pressed together for 3 seconds allows access to first level of programming mode.
Pressed together for 3 seconds allows access to EXV manual setting.
Controller initialization message
When the unit is initially powered on, the controller will display.
StepActionPhenomenon and description
1Power on controllerAll LEDs will light up for 3 seconds.
2
3Parameter setting file (bin file number) identifier will be displayed for 3 seconds.
4
Firmware version will be displayed for 3 seconds.
Normal display (actual suction temperature will be displayed on ZXV/ZXD unit, condensing
temperature will be displayed on ZX/ZXL/ZXB unit)
12
Bin files number range
Bin number rangeFamily
701-799ZXV, ZXLV
850ZXV service
851ZXLV service
After installation and initial power on, it is critical to double check the parameters below.
RTC (real time clock) setting
StepActionPhenomenon and description
1
2
3
4
5
6
7
8
Press “” + “”
Press “” or “”
Press “” or “”
Press “” + “”
Press “” + “”
Refrigerants
StepAction
1
Press “” + “”
Press “”
Press “”
Press “”
Enter menu to select “PAr” (parameter) or “rtC”
Select “rtC”
“n01” , minute
“n02” , hour
“n03” , day
“n04” , month
“n05” , year (last two digits)
Display actual value
Modify the value
Press“SET” : the value will flash for 3 seconds, then move to the next value
Exit to “rtC”
Exit to main menu (or wait for 120 seconds and exit automatically)
Phenomenon and description
Enter menu to select “PAr” (parameter) or “rtC”
2
3
4
5
6
7
8
Press “” or “”
Press “”
Press “” or “”
Press “”
Press “” or “”
Press “”
Press “” + “”
Select“PAr (parameter)”
Confirm selection
Browse to parameter C07
Confirm selection
Select refrigerant to be used
The number will flash for 3 seconds and confirm the refrigerant selection
Exit (or exit automatically after waiting for 120 seconds)
Evaporating temperature setting
StepActionPhenomenon and description
1
2
3
Press “” > 3 seconds
Press “” or “”
Press “”
Press “” button for more than 3 seconds, the measurement units (°C ) will flash
together.
Modify the number for target evaporating temperature
Press “” to confirm, the number will flash for 2 seconds (or wait for about 10
seconds to confirm)
13
Pr1 parameter (1st level) browse and modification
StepActionPhenomenon and description
1
2
3
4
5
6
7
8
Press “” +
Press “” or “”
Press “”
Press “” or “”
Press “”
Press “” or “”
Press “”
Press “” +
Enter menu to select “PAr” (parameter) or “rtC”
Select “PAr (parameter)”
Confirm, select, and browse Pr1 parameters
Browse Pr1 parameters
View the actual number of the Pr1 parameters
Modify the actual number of the Pr1 parameters
Press“SET” : The number will flash for 3 seconds and confirm the modification;
Will go to the next Pr1 parameter
Exit (or exit automatically after waiting for 120 seconds)
Quick access menu browse - sensors status and actual values
StepActionPhenomenon and description
1
2
3
4
Press “”
Press “”
Press “”
Press “” + “”
Enter quick access menu, will display“P1P” (Press “Up” or “Down” to view other sensors
View the actual value of “P1P”
Change to next sensor code
Exit (or exit automatically after waiting for 60 seconds)
• P1P : Pressure value of suction (only in ZXD & ZXV)
• P2t : Temperature value of condenser mid coil
• P2P : Pressure value of discharge (not used)
• P3t : Temperature value of DLT (discharge line temperature)
• P4t : Temperature value of VIT (vapor inlet temperature) (only in ZXL, ZXV, ZXB)
• P5t : Temperature value of VOT (vapor outlet temperature) (only in ZXL, ZXV, ZXB)
Sensor code and values descriptions
(“nP”, “noP”, or“nA” mean that the
sensor does not exist; “Err” means that
the sensor fails, out of range,
disconnected, or does not configure
correctly)
14
• P6t : Temperature value of ambient temperature
• P7t : Not used
• SH : Value of superheat when control logic control vapour injection superheating,
or display DLT values when control logic is control DLT
• oPP : Percentage of step EVI valve opening
• LLS : Status of the liquid line solenoid (not used)
• Std : Value of the condenser temperature setting
• Aoo : Percentage of condensing fan driver output
• dSo : Percentage of the PWM output driving the valve of the digital scroll
compressor (not used)
• inU : Compressor speed percentage of controller sent to driver
• inS : Compressor speed percentage of the reading values from driver
• iUt : Driver input voltage values (only valid in ZXV with EV2 drive)
• iPr : Driver input power values (only valid in ZXV with EV2 drive)
• Lt : Minimum room temperature (not used)
• Ht : Maximum room temperature (not used)
• tU1 : Voltage 1 (R-S terminal) values (not used)
• tU2 : Voltage 2 (S-T terminal) values (not used)
• tU3 : Voltage 3 (T-R terminal) values (not used)
• tA1 : Current 1 (upper transformer) values (not used)
• tA2 : Current 2 (lower transformer) values (not used)
• SLA: Quantity of low side controller connected with outdoor unit.
• HM : Time Menu (hour & minute)
Access alarm code (maximum of 50 record)
StepActionPhenomenon and description
1
2
3
4
5
6…
7
Press “”
Press “”
Press “”
Press “”
Press “”
Press “” + “”
Display “SEC”
Display “A01”
Display alarm code in “A01”
Display “A02”
Display alarm code in “A02”
Exit (or exit automatically after waiting for 15 seconds)
Exact timing of the alarm
StepActionPhenomenon and description
1
2
3
4
Press “”
Press “”
Press “”
Press “”
Display “SEC”
Display “A01”
Display alarm code in “A01”
Display “Hr”
10
11
12
13
14
5
6
7
8
9
Press “”
Press “”
Press “”
Press “”
Press “”
Press “”
Press “”
Press “”
Press “”
Press “” + “”
Display the alarm exact timing: hour
Display “Min”
Display the alarm exact timing: minute
Display “Day”
Display the alarm exact timing: day
Display “Mon”
Display the alarm exact timing: month
Display “yEA”
Display the alarm exact timing: year
Exit (or exit automatically after waiting for 15 seconds)
Upload the program from the controller to hot-key
StepActionPhenomenon and description
1
Inert Hot-Key when the
controller is ON
2
3
4
5Turn-on the controller
Press “”
Press “”
Turn-off the controller
and remove Hot-Key
the “uPL” message appears followed by a flashing “End” label
(Note: if display “Err”, it means it fails to upload program to Hot-Key.
Please restart the process.)
“End” will stop flashing
15
Download the program from hot-key to controller
StepActionPhenomenon and description
1Turn-off the controller
2Insert hot-key
3Turn-on the controller
4Controller will restart working with the new parameters after 10 seconds
5Remove hot-key
The “doL” message will blink followed a by a flashing “End” label (Note: if display “Err”, it
means it fails to download program to the controller. Please restart the process.)
Network wiring
Dixell XWEB300D serial address
• Connect to the ModBUS network using cable with 2 or 3 shielded wires, minimum section 0.5mm
(e.g. BELDEN8772)
• Do not connect shield to ground.
• Do not connect the “Gnd” terminal.
• Remember to draw a map of the line. This will help you to find an error if something is wrong.
• RS485 devices are polarity sensitive.
2
16
Figure 5. Correct network wiring
Figure 6 . Incorrect network wiring
Termination resistor for XWEB300D
ZX CDU connected to XWEB300D
If XWEB300D is placed at the beginning or at the end of
the line, please install its termination resistor by adding
a jumper in position 2 (JMP2 on the back side of the
unit). Do not add the jumper if XWEB300D is placed in
the middle of the RS485 line.
ZX CDU connected to the Dixell XWEB300D with the Intelligent Store
solution module using RS485 ModBUS.
Connect the ZX CDU to the ModBUS network as shown in Figure 7. Connect
the network cable to the three-terminal connector on the XWEB300D port
that has been configured as ModBUS port (COM 12, 13, 14).
Connect port “13” of XWEB300D to port “D0485 +” of CoreSense™ and
port “12” of XWEB300D to port “D1485 -” of CoreSense
for RS485 communication.
Figure 7. XWEB300D Connected to the Intelligent Store solution module
Dixell XWEB300D configuration
XWEB300D is compatible with ZX CDU if XWEB has the library of ZX controller CoreSense.
Login into XWEB
• Go to Information → Information
• If this is not present, follow the steps below.
Open Dixell website http://www.dixell.com/xweb300d-xweb500-xweb500d/eng/, then login (registration required)
• Go to Support → System sw update → XWEB300D XWEB500 XWEB500D
• Download the upgrade package with your web-browser, login into XWEB
• Go to Information → System Update menu
Provide the XW5 patch file
Once file has been selected wait until the upgrade procedure ends (XWEB reboots)
Verify the installation ended successfully by checking into the menu
• Go to Information → Information for string
Log in again and set up the ZX CDU
• Go to Configuration → Devices drop-down menu
• Go to Actions → New
• Enter device name in the Name field (e.g. ZX CDU)
• Select “XCM25D” in the Model field
• Enter the ModBUS address in the RS 485 address field
∙ Refer to setting of parameter “t01” in pr2 level in CoreSense™ (default setting is “1”)
• Click New
17
Communication with low side
There will be two parts, condensing unit and showcases or cold rooms. The condensing unit is in outdoor side, showcase/cold room is in
indoor side. The connection between condensing unit & showcases/cold rooms are RS485 wires.
The condensing unit controller works as MASTER mode, the showcases/cold rooms controllers work as SLAVE mode. Condensing unit
controller MASTER port can connect maximum 11 SLAVE controllers including compressor drive.
The communication address setting range of showcase/cold room controller is “1-15”. That means condensing unit controller will search
the showcase/cold room controllers from address 1 to 15, will not search the address above 15.
The structure of above description is shown as below.
Showcase/cold room controllers supported list
Device NameNOTES (Firmware Version Information)
XR60(V1.0)
XR70(V1.0)
XR75(V2.6)
XR77(V2.6)
XM678D(V2.8)
XM679K(V4.2)
XR35CX*(V2.6)
XM678D*(V5.4)
18
* XR35CX V2.6 & XM678D V5.4
will be supported soon.
Wiring connection between condensing unit &
showcase/cold room controllers
There will be two parts, condensing unit and showcases or cold rooms. The condensing unit is in outdoor side, showcase/cold room is in
indoor side. The connection between condensing unit & showcases/cold rooms are RS485 wires.
The condensing unit controller works as MASTER mode, the showcases/cold rooms controllers work as SLAVE mode. Condensing unit
controller MASTER port can connect maximum 11 SLAVE controllers including compressor drive.
The communication address setting range of showcase/cold room controller is “1-15”. That means condensing unit controller will search
the showcase/cold room controllers from address 1 to 15, will not search the address above 15.
The structure of above description is shown as below.
Notes:
• For XR60, XR70 controllers, need XJ485CX converter to connect to “Hot Key TTL” port to support RS485 communication wiring.
• The values of “SLA” in controller quick menu can show the connected quantity of showcase/cold room controllers.
19
Installation
Copeland™ ZX condensing units are delivered with a holding charge of neutral gas. The condensing unit should be located in a place
protected from excess amounts of dirt, sand, dust, plastic bags, leaves or paper debris which can cover and block the flow of air over
the condenser (fins). The unit must be installed without restricting the airflow. A clogged condenser will result in increased condensing
temperature, reducing the cooling capacity, causing the high-pressure switch to trip. Clean the condenser fins on a regular basis.
Condensing unit handling
Transport and storage
Move ZXV unit only with appropriate mechanical or handling equipment according to weight. Keep in the upright position. Do not stack
single boxes on top of each other without pallet in any case. Keep the packaging dry at all times.
Electrical connection
Power supply
The ZXV condensing unit electrical connection to the power supply must be made by qualified technicians, who should refer to the
electrical diagrams located inside the electric connection panel. The units are designed for below power supply at ± 10% voltage
tolerance. The circuit breaker must be switched off before opening the front panel.
Electrical wiring
Before commissioning, ensure that neutral “N” wire is connected to the terminal block (“N” furthest to the right). After proper
connection of the ZXV condensing unit, the control LED on the power board and control board will light up. For more details, see wiring
diagrams. Customers’ wire size needs to be selected to allow for the maximum operation current of each unit.
Caution!
Unit should be powered on at all times except during service. Failure to do so can result in component failure.
20
Refrigeration piping installation
All interconnecting pipes should be of refrigeration grade, clean, dehydrated and must remain capped at both ends until installation.
Even during installation, if the system is left for any reasonable period of time (say two hours), pipes should be re-capped to prevent
moisture and contaminants from entering the system.
Do not assume that the service connection sizes on the unit (at the service valves) are the correct size to run your interconnecting
refrigeration pipes. The service valve sizes have been selected for convenience of installation and in some cases (larger units) these
may be considered too small. However for the very short pipe run within our units, these service connection sizes are adequate. All
interconnecting pipes should be sized to satisfy the duty required.
Usually the suction line is insulated, but the liquid line is not. However the liquid line can pick up additional heat from the ambient and
adversely affect the sub-cooling desirable for the liquid refrigerant before it enters the expansion valve.
The pipe should be sized to ensure optimum performance and good oil return. The sizing must also take into account the full capacity
range through which this particular unit will need to operate.
Pipe runs should be kept as short as possible, using the minimum number of directional changes. Use large radius bends and avoid
trapping of oil and refrigerant. This is particularly important for the suction line. The suction line should ideally slope gently towards the
unit. Recommendation slope is 1/200~1/250. P traps, double risers and reduced pipe diameters may be required for suction lines where
long vertical risers cannot be avoided. All pipes should be adequately supported to prevent sagging which can create oil traps.
The recommended pipe clamp support distance is shown in the table.
Tube size
12.7mm (1/2 inch)1.20 m
16.0mm (5/8 inch)1.50 m
22.0mm (7/8 inch)1.85 m
28.5mm (1 1/8 inch)2.20 m
Max distance between
2 clamp support
Liquid line insulation
ZXV liquid line should be insulated with a 10mm insulation thickness. Temperature could be lower than 0°C.
Brazing recommendations
Maintain a flow of oxygen-free nitrogen through the system at a very low pressure during brazing. Nitrogen displaces the air and prevents
the formation of copper oxides in the system. If copper oxidization is allowed to form, the copper oxide material can later be swept
through the system and block screens such as those protecting capillary tubes, thermal expansion valves, and accumulator oil return
holes. This minimizes any entry of contaminants and moisture.
• Remove the liquid line connection cap.
• Then remove the suction connection cap.
• Open both valves midway. Care should be taken to avoid the
holding charge from releasing too quickly.
• Be sure tube fitting inner diameter and tube outer diameter
are clean prior to assembly.
• Since both tubes are extended from the condensing unit housing,
we recommend insulating the housing by using a wet cloth on the
copper tubing.
• Recommended brazing materials: a copper / phosphorous or copper
/ phosphorous / silver alloy rod should be used for joining copper to
copper whereas to join dissimilar or ferric metals, use a silver alloy
rod, either flux coated or with a separate.
• Use a double tip torch.
End of Tube
During brazing
protect housing
with damp cloth
OUTSIDEINSIDE UNIT
During brazing
pull back fire
insulation
21
Location and fixing
840
500
500
300
300
352
70
70
23
90
172
424
Power Supply Hole
Suction Service Valve
Liquid Service Valve
388
110
580
2 HOLESØ15MM DIA
2-R7.5MM GROOVE
1029
840
500
500
300
300
352
70
70
23
90
172
424
Power Supply Hole
Suction Service Valve
Liquid Service Valve
1242
172
90
300
a
500
500
352
7070
1029
23
424
94
Liquid Service Valve
Suction Service Valve
Power Supply Hole
388
110
580
2 HOLESØ15MM DIA
2-R7.5MM GROOVE
388
110
580
2 HOLESØ15MM DIA
2-R7.5MM GROOVE
1029
The unit should always be installed in a location that ensures clean air flow. It is recommended that a clearance of 300 mm from the wall
(or the next unit) be maintained from the unit’s left and rear panels whereas a clearance of 2 meters must be maintained from the unit’s
right, top and front panels (seen facing the front of the unit). Both service access and airflow have been considered in making these
recommendations. Where multiple units are to be installed in the same location, the contractor needs to consider each individual case
carefully. There can be many variations of unit quantities and available space and it is not the intention of this manual to go over these.
Ideally, the unit should be mounted on a solid concrete slab with anti-vibration pads between unit feet and concrete. However the ZX
condensing unit has also been designed for wall mounting on suitable brackets. Wall mounting brackets are not included. Another factor
to consider in finding a good installation site is the direction of the prevailing wind. For example if the air leaving the condenser faces
the prevailing wind, the air flow through the condenser can be impeded, causing high condensing temperatures ultimately resulting in
reducing unit life. A baffle is a remedy for this situation.
Fixing dimensions and distance - single fan unit
Fixing dimensions and distance - dual fan unit
Start up and operation
Before commissioning, ensure that all valves on the condensing unit are fully opened.
Vacuuming
The evacuation procedure is based upon achieving an actual system vacuum standard and is not time dependent. Before the installation
is put into commission, it has to be evacuated with a vacuum pump. Proper evacuation reduces residual moisture to 50ppm. The
installation of adequately sized access valves at the furthest point from the compressor in the suction and liquid lines is advisable. To
achieve undisturbed operation, the compressor valves are closed and the system is evacuated down to 0.3 mbar / 0.225 Torr. Pressure
must be measured using a vacuum pressure (Torr) gauge on the access valves and not on the vacuum pump; this serves to avoid incorrect
measurements resulting from the pressure gradient along the connecting lines to the pump.
22
Charging procedure
Refrigerant charging procedure
The scroll compressor design requires system charging as quickly as possible with liquid refrigerant into the liquid line. This will avoid
running the compressor under conditions where there is insufficient suction gas. Sufficient suction gas is available to cool not only the
motor but also the scrolls. Temperature builds up very quickly in the scrolls if this is not done. Do not charge vapor (gas) refrigerant into the
ZX Scroll unit. The suction service valve must not be fully closed at any time while the compressor is running. To do so would cause damage
to the compressor in the same manner as explained above. This valve is provided for ease of connection and for the fitting of service gauges
without removing the unit panel. It is recommended to charge the ZX unit with refrigerant via its service valves. It is recommended to break
the vacuum in the system with a partial charge of the refrigerant, before starting the system. For charge adjustment, it is recommended to
check the liquid sight glass just before the expansion valve.
Oil charging procedure
Emerson ZX condensing units are supplied only with a compressor oil charge. After commissioning, the oil level should be checked and
topped up if necessary. The oil level should be approximately halfway up the sight glass (ZXL/ZXV/ ZXD units). Oil can be charged through
the Schraeder valve on suction valve.
Scroll compressor rotation direction
Scroll compressors, like several other types of compressors, will only compress in one rotational direction. Comparing to normal 3-phase
fixed compressors, ZXV unit compressor rotational direction is checked at the right direction in the plant. Customer power connection
sequence does not change the compressor rotation direction.
Maximum compressor cycle
Maximum permitted starts per hour is 10.
Check before starting & during operation
Both valves should be fully opened on the liquid line, in order to prevent trapping liquid.
• Check that all valves are fully opened.
• After starting and operation conditions are stabilized, it is recommended to check the oil level in compressor(s) and see if
there is a need to add oil to ensure a sufficient oil level (halfway up the sight glass).
ZXV do’s and don’t
Do’sDon’ts
1. Unit should be grounded at all time
2. Wait for at least 2 minutes after power disconnection
to do drive assm service
3. Refrigerant charge connection size: ½” -20 UNF
(Not 7/16” – 20 UNF)
4. Pay special attention to refrigerant charge
– Liquid indicator should be full all the time
– Compressor suction sh should be ~5 to 10k
– Condensing temperature should be 8~10k larger than
ambient temperature
5. Liquid pipe line should be insulated by insulation material (10 mm)
1. Don’t connect power supply directly to
the compressor at any time
2. Don’t touch the chokes. These become hot during
operation.
3. Don’t touch the condenser fins.
6. Safe oil level is from ¼ to ¾ of the compressor oil sight glass
7. After compressor replacement, check the rotation.
If reverse rotation is observed, please change two
connections at the compressor t-box. Changing at unit’s
power supply will not correct reverse rotation.
8. With louvered fin, regular condenser cleaning is
necessary to keep unit operating efficiently.
9. Note that sound generated by the unit is not constant
due to changes in compressor speed
Technical data are correct at the time of printing. Updates may occur, and should you need
confirmation of a specific value, please contact Emerson clearly stating the information required.
Emerson cannot be held responsible for errors in capacities, dimensions, etc., stated herein. Products,
specifications and data in this literature are subject to change without notice.
The information given herein is based on data and tests which Emerson believes to be reliable and
which are in accordance with today’s technical knowledge. It is intended for use by persons having the
appropriate technical knowledge and skill, at their own discretion and risk. Our products are designed
and adapted for fixed locations. For mobile applications, failures may occur.
The suitability for this has to be assured from the plant manufacturer, which may include making
appropriate tests.
Note:
The components listed in this catalogue are not released for use with caustic, poisonous or flammable
substances. Emerson cannot be held responsible for any damage caused by using these substances.
About Emerson
Emerson (NYSE: EMR), headquartered in St. Louis, Missouri (USA), is a global technology and
engineering company providing innovative solutions for customers in industrial, commercial,
and residential markets. Our Emerson Automation Solutions business helps process, hybrid,
and discrete manufacturers maximize production, protect personnel and the environment
while optimizing their energy and operating costs. Our Emerson Commercial and Residential
Solutions business helps ensure human comfort and health, protect food quality and safety,
advance energy efficiency, and create sustainable infrastructure. For more information visit
Emerson.com.
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