Emerson Copeland EazyCool ZX Series Instruction Manual

Copeland™EazyCool
Outdoor Condensing Units
for A2L Applications
ZX Range
Application Guidelines

AGL_Unit_ZX_A2L_E_Rev00
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™EazyCool ZX condensing units...........................3
2.2 EU Ecodesign Directive 2009/125/EC...............................................................................3
2.3 Main product features and dimensions..............................................................................3
2.4 Product nameplate.............................................................................................................5
2.5 Nomenclature.....................................................................................................................5
2.6 Application range ...............................................................................................................6
2.6.1 Qualified refrigerants and oils ................................................................................6
2.6.2 Application limits.....................................................................................................6
2.7 BOM variations ..................................................................................................................6
2.8 P&I diagrams .....................................................................................................................7
2.8.1 ZXMY units.............................................................................................................7
2.8.2 ZXDY units .............................................................................................................8
2.9 Main components description............................................................................................9
2.9.1 Compressor............................................................................................................9
2.9.2 Condenser fan(s)....................................................................................................9
2.9.3 Housing ..................................................................................................................9
2.10 XCM25D Electronic controller –Features .......................................................................10
2.10.1 Description ...........................................................................................................10
2.10.2 Functionalities ......................................................................................................10
2.10.3 Modbus communication .......................................................................................11
2.10.4 Main control & safety features..............................................................................11
2.10.5 Additional features for customization ...................................................................12
2.11 XCM25D Electronic controller –Programming................................................................18
2.11.1 Programming the local display.............................................................................18
2.11.2 Remote display CCM60 .......................................................................................19
2.11.3 Single commands.................................................................................................19
2.11.4 Double commands –Entering programming level 1 "Pr1"...................................20
2.11.5 How to program the parameters (Pr1 and Pr2)....................................................20
2.11.6 Entering programming level 2 "Pr2".....................................................................20
2.11.7 Fast access menu ................................................................................................21
2.12 Controller keyboard..........................................................................................................21
2.12.1 How to lock the keyboard.....................................................................................21
2.12.2 How to unlock the keyboard.................................................................................21
2.13 Parameters level 1 –Required settings...........................................................................22

AGL_Unit_ZX_A2L_E_Rev00
2.14 Digital operation...............................................................................................................22
2.15 Pumpdown mode.............................................................................................................23
2.15.1 External pumpdown without XCM25D integration (not available with ZXDY units)23
2.15.2 Pumpdown by the unit controller (not available with ZXDY units) .......................23
2.15.3 Pumpdown with room thermostat (not available with ZXDY units) ......................24
2.15.4 Internal pumpdown with temperature sensor (case temperature) .......................25
2.16 Reset to factory settings –Emerson "Hot Key" ...............................................................26
2.16.1 How to save factory settings or user settings ......................................................26
2.16.2 Applicable hot key for ZX units with XCM25D controller......................................26
2.16.3 Location of the "Hot Key" plug connection on the XCM25D controller ................26
2.16.4 How to program a "Hot Key" from the controller (upload)....................................26
2.16.5 How to program a controller using an Emerson "Hot Key" (download) ...............27
2.17 Troubleshooting –Alarm history......................................................................................27
2.18 Compressor motor protection ..........................................................................................28
2.19 System pressure protection.............................................................................................28
2.20 Other inputs of the XCM25D controller............................................................................28
2.20.1 Customer-supplied control (room thermostat)......................................................28
2.20.2 Case temperature controller.................................................................................28
2.20.3 Ambient temperature sensor................................................................................28
2.21 Alarm output (DO5) of the XCM25D controller................................................................28
3Installation....................................................................................................... 29
3.1 Condensing unit handling ................................................................................................29
3.1.1 Transport and storage..........................................................................................29
3.1.2 Weights.................................................................................................................29
3.2 Refrigeration piping connections .....................................................................................30
3.2.1 Refrigeration piping installation............................................................................30
3.2.2 Brazing recommendations....................................................................................31
3.2.3 Brazing procedure................................................................................................32
3.3 Electrical connection........................................................................................................32
3.3.1 Power supply connections....................................................................................33
3.3.2 Maximum operating currents for cable selection .................................................33
3.3.3 Electrical wiring ....................................................................................................33
3.3.4 Electrical protection standard (protection class) ..................................................33
3.3.5 Terminal box.........................................................................................................33
3.3.6 Low-pressure protection.......................................................................................34
3.3.7 Crankcase heater.................................................................................................34
3.3.8 Insulation material ................................................................................................34
3.3.9 Sound and vibration .............................................................................................34
3.3.10 High-potential testing............................................................................................34
3.3.11 Circuit breaker with overcurrent protection ..........................................................35
3.4 Location & fixings.............................................................................................................35

AGL_Unit_ZX_A2L_E_Rev00
4Start-up & operation........................................................................................ 37
4.1 Strength-pressure test .....................................................................................................37
4.2 System tightness test.......................................................................................................37
4.3 Evacuation .......................................................................................................................37
4.4 Charging procedure .........................................................................................................38
4.4.1 Refrigerant charging procedure ...........................................................................38
4.4.2 Oil charging procedure.........................................................................................39
4.4.3 Oil separator.........................................................................................................39
4.5 Rotation direction of scroll compressors..........................................................................39
4.6 Maximum compressor cycle ............................................................................................39
4.7 Checks before starting & during operation ......................................................................39
4.8 Pressure fluctuations in case of digital unit......................................................................40
4.9 Pumpdown cycle..............................................................................................................40
5Maintenance & repair...................................................................................... 41
5.1 General considerations....................................................................................................41
5.2 Qualification of workers....................................................................................................41
5.3 Preparation and work procedure .....................................................................................42
5.4 Disassembling system components ................................................................................42
5.5 Exchanging the refrigerant...............................................................................................42
5.6 Replacing a compressor..................................................................................................42
5.7 Replacing the crankcase heater ......................................................................................43
5.8 Electrical terminations......................................................................................................44
5.9 Condenser fins.................................................................................................................45
5.10 Routine leak testing .........................................................................................................45
5.11 Condenser fans & motors................................................................................................45
6Certification & approval.................................................................................. 45
7Dismantling & disposal................................................................................... 45
DISCLAIMER ............................................................................................................... 46
Appendix 1: Overview of the ZX unit components................................................... 47
Appendix 2: Wiring diagram –ZXMY units (380-420 V / 3 Ph / 50 Hz)..................... 48
Appendix 3: Wiring diagram –ZXDY units (380-420 V / 3 Ph / 50 Hz)...................... 49
Appendix 4: Parameters level 1................................................................................. 50
Appendix 5: Alarm menu............................................................................................ 51
Appendix 6: Additional features for customization.................................................. 56
Appendix 7: Temperature / resistance curve for B7 Sensor (customer option)..... 60
Appendix 8: List of tables and figures ...................................................................... 61

AGL_Unit_ZX_A2L_E_Rev00 1
About these guidelines
The purpose of these application guidelines is to provide guidance in the application of Copeland™
EazyCool ZX outdoor condensing units. 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 condensing units. The performance and reliability of the product may be
impacted if the product is not used according to these guidelines or is misused.
These application guidelines cover stationary applications only. For mobile applications, contact
Application Engineering as other considerations may apply.
1 Safety instructions
Copeland™EazyCool ZX outdoor condensing units are manufactured according to the latest
European safety standards. Particular emphasis has been placed on the user's safety.
These condensing units are intended for installation in machines and systems in accordance with
the European Machinery Directive MD 2006/42/EC, the Pressure Equipment Directive
PED 2014/68/EU and the Low Voltage Directive LVD 2014/35/EU. They may be put to service only
if they have been installed in systems according to instructions and conform to the corresponding
provisions of legislation.
IMPORTANT: Only dedicated compressors and condensing units are allowed to be used with
flammable refrigerants. Emerson marks all compressors and units that are qualified for
flammable refrigerants with a sticker indicating the usage of such refrigerants. Systems using
flammable refrigerants must be executed correctly while observing safety rules, as specified
in corresponding safety standards such as, but not limited to EN 378. They must comply with
any and all applicable legislation and regulations. Ensuring compliance remains the user’s
responsibility.
These instructions should be retained throughout the lifetime of both the compressor and the
condensing 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.
Fire hazard
This icon indicates a risk of flammable
atmosphere.
High voltage
This icon indicates operations with a
danger of electric shock.
CAUTION
This icon indicates instructions to
avoid property damage and possible
personal injury.
Danger of burning or frostbite
This icon indicates operations with a
danger of burning or frostbite.
IMPORTANT
This icon indicates instructions to
avoid malfunction of the compressor.
Explosion hazard
This icon indicates operations with a
danger of explosion.
NOTE
This word indicates a
recommendation for easier operation.
Danger of explosive atmosphere
This icon indicates a risk of explosive
atmosphere.
1.2 Safety statements
▪Condensing 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 RACHP personnel are permitted to install, commission and
maintain this equipment. Only competent personnel (as specified in EN 13313) qualified
for flammable refrigerant handling is permitted to commission, initiate and maintain the

2 AGL_Unit_ZX_A2L_E_Rev00
compressor/refrigeration systems; non-trained personnel, including the user, are not
allowed to do so and must call on an expert.
▪The maximum refrigerant charge is specified in standards such as, but not limited to
EN 378, EN 60335-2-40 and EN 60335-2-89. The system designer shall implement all safety
measures defined by the applicable standards and the maximum refrigerant charge shall
not be exceeded.
▪If a flammable atmosphere is detected, immediately take all necessary precautions to
mitigate the risk as determined in the risk assessment.
▪Electrical connections must be made by qualified electrical personnel.
▪All valid safety 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.
1.3 General instructions
WARNING
Pressurized system! Serious personal injuries and/or system
breakdown! Accidental system start before complete set-up must be avoided.
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 of
nitrogen, or when the compressor service valves are closed.
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
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
come into contact with it. Lock and mark accessible sections.
CAUTION
Overheating! Bearing damage! Do not operate compressors without
refrigerant charge or without being connected to the system.
CAUTION
Contact with refrigerant oil! Material damage! Polyolester oil (POE) 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.
The contractor is responsible for the installation of the unit and should check the following points:
▪Sufficient liquid sub-cooling in the line to the expansion valve(s) to avoid "flash-gas" in the liquid
line;
▪Sufficient amount of oil in the compressor (in case of long piping additional oil must be charged).

AGL_Unit_ZX_A2L_E_Rev00 3
2 Product description
2.1 General information about Copeland™EazyCool ZX condensing units
Emerson has developed the Copeland™EazyCool ZXoutdoor condensing unit of second generation
to meet primarily the demands of the food retail and food service sectors. It is a refrigeration air-
cooled condensing unit that uses the latest Copeland™brand products patented scroll technology
as the main driver and has electronic protection and diagnostics features built in the compact chassis.
The combination of large condensers and low speed fans allows for particularly quiet operation.
2.2 EU Ecodesign Directive 2009/125/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 efficiency standards. Copeland™brand products condensing units are prepared and
optimized to meet the requirements of the Ecodesign Directive. The integrated variable speed fan
and condenser reduce the noise level and energy consumption significantly. This, combined with
Copeland scroll technology, allows for high-efficiency operation.
For the rated cooling capacity, rated power input and rated COP value please refer to Copeland™
brand products Select software at www.climate.emerson.com/en-gb.
These guidelines meet the requirements of Regulation 2015/1095, Annex V, section 2(a), with regard
to product information, namely:
▪(v) ➔See chapter 2.6 "Application range"
▪(vi) ➔See chapters 5.9 "Condenser fins" and 5.10 "Routine leak testing"
▪(vii) ➔See chapters 2.10.4 "Main control & safety features" and 4.4 "Charging procedure"
▪(viii) ➔See chapter 7 "Dismantling & disposal"
2.3 Main product features and dimensions
Copeland EazyCool ZX condensing units are released for multiple refrigerants. They are available in
two cabinet sizes and are equipped with one or two fans.
These units are designed for medium-temperature refrigeration applications.

4 AGL_Unit_ZX_A2L_E_Rev00
Unit
Refrigerant
types
Displacement
@ 50 Hz
(m3/h)
Cooling
capacity*
(kW)
Nominal
power (kW)
Rated
current
(A)
PS
high side
(bar)
PS
low side
(bar)
Medium temperature standard
ZXMY-020E
R454A, R454C
& R455A
5.9
3.42
1.58
5.4
28.8
21
ZXMY-030E
8.6
5.05
2.28
7.7
ZXMY-040E
11.7
6.58
3.29
10.8
ZXMY-050E
14.4
8.77
3.79
13.8
ZXMY-060E
17.1
10.05
4.41
14.1
ZXMY-075E
18.8
11.6
5.07
15.0
Medium temperature Digital
ZXDY-030E
R454A, R454C
& R455A
8.3
5.13
2.21
7.2
ZXDY-040E
11.4
7.21
2.72
8.9
ZXDY-050E
14.4
8.65
3.67
12.3
ZXDY-060E
17.1
10.1
4.46
12.4
ZXDY-075E
18.8
11.4
4.83
15.0
Table 1: ZX condensing unit technical data
Unit
Outer dimensions
length/width/height with
closed cover (mm)
Net weight
(kg)
Fan
number
Liquid
receiver size
(litres)
Medium temperature standard
ZXMY-020E
424 / 1027 / 840
76
1
4.1
ZXMY-030E
79
ZXMY-040E
91
ZXMY-050E
424 / 1029 / 1244
108
2
5.9
ZXMY-060E
112
ZXMY-075E
118
Medium temperature Digital
ZXDY-030E
424 / 1027 / 840
82
1
4.1
ZXDY-040E
424 / 1029 / 1244
104
2
5.9
ZXDY-050E
108
ZXDY-060E
112
ZXDY-075E
118
Table 2: ZX condensing unit features
The figures hereafter show the overall physical dimensions of the ZX condensing units in millimetres:
Figure 1: Dimensions of models ZXMY-020E to ZXMY-040E and ZXDY-030E (single-fan units)

AGL_Unit_ZX_A2L_E_Rev00 5
Figure 2: Dimensions of models ZXMY-050E to ZXMY-075E and ZXDY-040E to ZXDY-075E (dual-fan units)
2.4 Product nameplate
The condensing unit nameplate shows model designation and serial number, as well as locked rotor
amps, maximum operating current, safety pressures and weight.
The compressor has its own nameplate with all electrical characteristics.
2.5 Nomenclature
The model designation contains the following technical information about the condensing unit:
Figure 3: Nomenclature ZX units

6 AGL_Unit_ZX_A2L_E_Rev00
2.6 Application range
2.6.1 Qualified refrigerants and oils
Qualified
refrigerants
R454A, R454C & R455A
Qualified
servicing
oils
Emkarate RL 32 3MAF
Mobil EAL Arctic 22CC
Oil charge
in litres
ZXMY-020E
ZXMY-030E
ZXDY-030E
ZXDY-040E
ZXDY-050E
ZXDY-060E
ZXDY-075E
ZXMY-040E
ZXMY-050E
ZXMY-060E
ZXMY-075E
1
1.1
1.24
1.77
1.85
Table 3: Qualified refrigerants and oils
NOTE: R454A, R454C and R455A are classified as A2L (mildly flammable) refrigerants.
NOTE: ZXDY units are equipped with an oil separator. The separator is pre-charged with
0.5 litre of oil.
2.6.2 Application limits
For application envelopes, please refer to the compressor application envelopes which can be found
in Copeland™brand products Select software, available at www.climate.emerson.com/en-gb.
ZX condensing units can be used at ambient temperatures from -15 to 45 °C. For lower ambient
temperatures please contact your local Application Engineering representative.
2.7 BOM variations
The BOM (bill of material) number at the end of the unit designation indicates the different unit layouts
and details. The ZX units covered in these guidelines are available in the following BOM versions:
BOM
Family
Introduction
date
Controller concept
Oil
separator
Suction
accumulator
304
ZXMY
10/2020
XCM25D (Emerson - Dixell)
No
No
454
ZXDY
10/2020
XCM25D (Emerson - Dixell)
Yes
No
Table 4: BOM
NOTE: These guidelines are of application only for BOM 304 and 454.

AGL_Unit_ZX_A2L_E_Rev00 7
2.8 P&I diagrams
2.8.1 ZXMY units
Figure 4: P&I diagram for ZXMY units
Position
Description
Comments
Fast access
menu
1
High-efficiency Copeland scroll compressor
2
Condenser with 1 or 2 fans
3
Liquid receiver
4
Filter drier / sight glass combination
5
Expansion device for suction line injection
6
Service valve, suction line
7
Service valve, liquid line
PSH (S1)
Fixed high-pressure switch
System safety
PTL (B1)
Suction pressure sensor, low pressure
Compressor setpoint
P1P
PTH (B2)
Pressure sensor, high pressure
Fan speed control
P2P
TT1 (B3)
Discharge temperature sensor
Compressor safety
P3t
TT2 (B6)
Ambient temperature sensor
Additional functions
P6t
Table 5: Legend of the P&I diagram for ZXMY units

8 AGL_Unit_ZX_A2L_E_Rev00
2.8.2 ZXDY units
Figure 5: P&I diagram for ZXDY units
Position
Description
Comments
Fast access
menu
1
High-efficiency Copeland scroll compressor
(YBD* for Digital)
2
Oil separator
Pre-charged with 0.5 L
3
Condenser with 1 or 2 fans
4
Liquid receiver
5
Filter drier / sight glass combination
6
Service valve, liquid line
7
Service valve, suction line
8
Crankcase heater
Y1
Digital solenoid
PSH (S1)
Fixed high-pressure switch
System safety
PTL (B1)
Suction pressure sensor, low pressure
Compressor setpoint
P1P
PTH (B2)
Pressure sensor, high pressure
Fan speed control
P2P
TT1 (B3)
Discharge temperature sensor
Compressor safety
P3t
TT2 (B6)
Ambient temperature sensor
Additional functions
P6t
Table 6: Legend of the P&I diagram for ZXDY units

AGL_Unit_ZX_A2L_E_Rev00 9
2.9 Main components description
2.9.1 Compressor
Unit model
Compressor model
Medium temperature standard
ZXMY-020E
YB12K1E-TFMN
ZXMY-030E
YB17K1E-TFMN
ZXMY-040E
YB24K1E-TFMN
ZXMY-050E
YB31K1E-TFMN
ZXMY-060E
YB36K1E-TFMN
ZXME-075E
YB45K1E-TFMN
Medium temperature Digital
ZXDY-030E
YBD17K1E-TFMN
ZXDY-040E
YBD24K1E-TFMN
ZXDY-050E
YBD31K1E-TFMN
ZXDY-060E
YBD36K1E-TFMN
ZXDY-075E
YBD45K1E-TFMN
Table 7: Compressor models cross reference
2.9.2 Condenser fan(s)
The condensers of the ZX condensing units are equipped with single-phase fans.
Condensing units
Nr. of fans
(pcs)
Fan
speed
(rpm)
Diameter
(mm)
Voltage
(V / ph / Hz)
Power
input
(W)
Medium temperature
Standard
Digital
ZXMY-020E
1
830
450
380 - 420 V /
1 Ph / 50 Hz
115
ZXMY-030E
ZXDY-030E
ZXMY-040E
ZXDY-040E
2
230
ZXMY-050E
ZXDY-050E
ZXMY-060E
ZXDY-060E
ZXMY-075E
ZXDY-075E
Table 8: Condenser fans technical data
2.9.3 Housing
ZX condensing units with BOM 304 & 454 have
specific housing features:
▪Controller-window in the cabinet door. The
window is IP54. It shows the current value
of the electronic controller.
▪The main power switch is installed on the
cabinet door and allows to de-energize the
unit without opening the cabinet door. To
open the door the main power switch must
be in off position.
▪The quick-locks allow for easy and quick
opening of the cabinet door by means of the
cabinet key.
▪The cabinet key is delivered with the unit. It
is attached to one of the piping connections
by means of a cable strap.
Figure 6: ZX unit housing

10 AGL_Unit_ZX_A2L_E_Rev00
2.10 XCM25D Electronic controller –Features
The XCM25D controller is designed to be a powerful, flexible controller for use in multiple
applications. It has been developed for condensing units and allows the adjustment of all relevant
parameters by the user.
2.10.1 Description
WARNING
Electrical pins under voltage! Electrical shock hazard! There are unused
fast-on pins (C1 & DO2) on the XCM25D which could be under voltage. They
are covered by insulated fast-on flags in the factory. Handle carefully when
removing insulating flags during service on site.
The controller is designed for usage in an outdoor refrigeration unit. It is rated to be used for the
following environment:
▪Outdoor ambient temperature for controller operation: -40 to +60 C
▪Ambient temperature for storage: -40 to +80 C
▪Maximum humidity: 90 % at 48 C (non-condensing)
▪Board power: 24 VAC +15 %/-20 %
▪Voltage sensing capabilities - Three phase: 200-240, 380-460, 575 VAC ± 10 %
The units of measure are selectable. The factory default unit is bar (always considered relative) for
pressure and °C for temperature.
Figure 7: XCM25D Electronic controller
2.10.2 Functionalities
The controller allows for easy commissioning by the technician with the factory settings at the highest
program level. It also offers the possibility to make substantial changes to the system optimization in
further programming levels. Advanced functionalities can also be activated.
The following functions are covered by the controller:
▪Condensing unit control
▪Case control
▪Condenser fan control
▪Defrost
▪Voltage and current sensing (compressor protection)
▪System EXV control
▪Digital compressor control
▪Modbus/Canbus communication
NOTE: The XCM25D controller includes all the functions necessary for the control of the ZX
units. For additional functionalities please contact your local Application Engineering
representative.

AGL_Unit_ZX_A2L_E_Rev00 11
Figure 8: XCM25D controller functionality overview
2.10.3 Modbus communication
The XCM25D controller can communicate via Modbus (RS-485) connection to provide all running
data. Additional commands can also be activated through Modbus connection. The Modbus map is
available on request from the Application Engineering department at Emerson.
A pre-configured X-Web Supervisor device is also available and allows easy handling and
connectivity with the XCM25D controller.
Figure 9: Modbus port and termination jumpers
NOTE: If the XCM25D controller is connected in chain the termination jumpers must be
removed.
2.10.4 Main control & safety features
Suction pressure control: Each unit is equipped with a suction pressure transmitter. The XCM25D
controls the suction pressure by evaluating the input signal of the pressure transmitter. When using
a digital unit (ZXDY), the setpoint (C16) and proportional band (C17) need to be adjusted. The suction
pressure regulation for ZXMY units has to be defined by compressor cut-in (C01) and cut-out (C02)
values. The signal of the suction pressure transmitter is also used for additional functionalities,
pumpdown and keeping the compressor running within the approved envelopes.
Condensing pressure control: Each unit is equipped with a high-pressure transmitter. The
XCM25D controls the condensing pressure by regulating the fan speed corresponding to the high-
pressure transmitter signal. The unit controller can regulate the condensing pressure in two ways.
The first approach is to keep a constant condensing temperature. This mode is utilized by the factory
settings. The pre-adjusted setpoint is 27 °C as a universal setting. If lower condensing pressure is
required set up the condenser setpoint (E39) to a lower value. The second control way is fan
modulation based on compressor envelope. This mode of setpoint control is only available if a suction
pressure input is not used. The parameter (E38) enables/disables the mode as needed. If this
function is unused, the condensing temperature setpoint will be set as a parameter (E39) value. The
compressor is allowed to run different minimum condensing temperatures based on the suction
pressure of the compressor. This is the most energy efficient way to minimize the condensing
temperature as much as possible.
Condenser fan
control
Digital scroll
control (ZXDY)
Liquid injection
Alarm
management
Electrical
protection
Monitoring of the discharge
line temperature

12 AGL_Unit_ZX_A2L_E_Rev00
Automatic liquid injection on ZXMY: The electronic controller automatically instructs liquid
refrigerant to be injected into the suction line of the scroll compressor to reduce discharge
temperatures generated when the unit operates at increasing compression ratios. The electronic
controller reacts automatically to a thermistor which is attached to the discharge line on all ZXMY
units. The controller converts this signal for the linear stepper motor driving the liquid injection valve
to a position that enables the compressor to continue operating within its safe envelope.
Compressor phase reversal: Ensures that the compressor keeps running in one direction only
(clockwise = right rotation) –necessary for a compliant scroll compressor to compress and pump
refrigerant. Reset is automatic once the phase rotation is correct for the compressor.
Motor current overload protection: This feature eliminates the need for external current protection
for the compressor motor.
Fixed high-pressure switch: This is a non-adjustable protection device designed to prevent the
compressor from operating outside of its safe high-pressure range. Reset is automatic for a set
number of trips (7) then the unit will lock out and require manual restart. This feature is important to
prevent the ZX unit from cycling under these controls for a long period of time.
▪ZXMY units: 31 bar cut-out / 22 bar cut-in.
▪ZXDY units: 31 bar cut-out / 22 bar cut-in.
Adjustable high-pressure limitation: The unit controller provides the possibility to stop the unit at
a required discharge pressure which is lower than the cut-out value of the fixed high-pressure switch.
Detailed instructions can be found in chapter 2.10.5 "Additional features for customization"
hereunder.
Discharge temperature protection: Each unit is equipped with a discharge line sensor (NTC). The
information from the NTC sensor is used to activate liquid injection when required. The XCM25D
controller will stop the compressor if discharge temperatures reach unacceptable levels.
Adjustable low-pressure alarm: The unit controller features an adjustable low-pressure alarm
managed by the suction pressure sensor. The factory setting of this alarm is the lowest permitted
pressure of the refrigerant with the lowest pressure-vapour properties. If needed the user can modify
this value according to the required application.
▪ZXMY units: 0.5 bar rel
▪ZXDY units: 0.5 bar rel
A crankcase heater is directly connected to the controller. The crankcase heater will be energized
when the ambient sensor is below a given value (10 °C) and the compressor has been off for a
defined period of time (5 minutes). The minimum off time does not apply at initial power up.
In addition to the above, the ZX condensing unit has the following features:
▪Liquid line assembly (filter drier and sight glass/moisture indicator)
▪Anti-corrosion treatment to the condenser fins
The electronic controller is also the base controller for the connection of many optional and customer-
supplied functions such as:
▪Main load controller (or thermostat)
▪Evaporator electric defrost heater contactor
▪Evaporator fan contactor
▪Superheat controller for one electronic expansion device
2.10.5 Additional features for customization
A lot of additional features are provided by the XCM25D controller. In the European design of the
electrical panel a few of the additional functionalities are prearranged and can easily be installed by
connecting additional hardware to the electrical terminals. The tables in Appendix 6 show the
parameters that have to be changed in case a special feature of the controller should be activated.
The tables do not show the required settings which have to be done by the system operator, eg,
choosing correct setpoints for different components and different applications.
NOTE: After programming an additional function, the system will have to be restarted. To
engage system restart, switch off the main power supply, wait for 5 seconds and switch it on
again.

AGL_Unit_ZX_A2L_E_Rev00 13
Component
Description
Prearranged terminals /
Wiring diagram
Y3
Solenoid valve liquid line (not available on
ZXDY units)
Terminals: X1.N / X1.8
S3
Room thermostat for pumpdown or direct
control
Terminals: X1.9 / X1.10
Alarm contact
Sensor for evaporator or room
Terminals: X1.11 / X1.12
Sensor B7
Sensor for evaporator or room (NTC 10kΩ)
Terminals: X1.13 / X1.14
Table 9: Pre-arranged additional connections
Figure 10: Pre-arranged additional connections
NOTE: Depending on the required functionalities additional components might be necessary.
Please contact your local Application Engineering representative.
NOTE: Check the current limitations given by the controller relays.
NOTE: The solenoid valve function is not available on ZXDY units.
Digital output
Specifications
DO1, DO2 and DO3
Relay SPDT 16 A, 250 VAC
DO3
Relay SPST 8 A, 250 VAC
DO4 and DO5
Relay SPST 5 A, 250 VAC
Table 10: Digital output specifications
Temperature control by means of an external room thermostat (not available with ZXDY units)
The temperature of a cold room or cooling cabinet can be controlled by means of an external room
thermostat (Digital Input DI3, parameter R07).
The parameters that must be changed to control a cooling cabinet or a cold room with a room
thermostat are listed in Table 11 below:
Parameter
Description
Factory settings
Recommended settings / Comments
C05
Compressor
regulation probe
selection
1 = Suction pressure
probe = SuP
Suction pressure switch / Room
thermostat input = 3 = diS
G56
Use the liquid line
solenoid
NO
NO >> If a solenoid is used in the liquid
line, see paragraph 2.15 "Pumpdown
mode" for parameter settings
R07
Digital Input 3
function
0 = Not used = nu
Suction pressure switch / Room
thermostat input = 1 = SuS
R08
Digital Input 3
polarity
1 = Closed = CL
1 = Closed = CL (no change)
Table 11: External room thermostat –Parameters

14 AGL_Unit_ZX_A2L_E_Rev00
With these settings the controller will switch the compressor according to the status of the connected
device (room thermostat):
▪if the input is closed, turn the compressor on (On-Off-compressor)
▪if the input is open, turn the compressor off (On-Off-compressor)
Temperature control by means of an external temperature probe (not recommended for ZXDY
units)
The temperature of a cold room or cooling cabinet can be controlled by means of an additional
temperature (Analog Input AI7, component B7 in wiring diagram) probe (NTC, 10kΩ – for detailed
temperature-resistance-curve, see Appendix 7). The probe can be located in the evaporator or in
the room. The location of the probe has to be considered for the configuration of the P7C/A19 setting.
Based on the value provided by the B7-temperature sensor the compressor will be switched on and
off according to the following graphics:
Figure 11: External temperature sensor –Functionality
The following parameters must be adjusted to control a cooling cabinet or a cold room with a
temperature sensor:
Parameter
Description
Factory settings /
Range
Recommended settings / Comments
A19
Probe 7
configuration
0 = Not used = nu
Thermostat temp (NTC10K) = 2 = tnt or
Evaporator temp (NTC10K) = 5 = EPt
C05
Compressor
regulation probe
selection
1 = Suction pressure
probe = SuP
Case temperature = 2 = CSt
G01
Case temperature
probe selection
0 = Not used = nu
Thermostat temperature = 4 = tnt or
Evaporator temperature = 5 = EPt
G02
Setpoint case
temperature
2 °C
Choose setpoint according to requirements
of cooled goods
G03
Position differential
case temperature
1 K / 0.1 to 25.5 K
Setpoint G02 + positive differential G03
results in cut-out value for compressor
G04
Case temperature
lower limit G02
-10 °C / -40 °C to G05
Define limits to avoid wrong settings for G02
G05
Case temperature
upper limit G02
+15 °C / G04 to 110 °C
Define limits to avoid wrong settings for G02
G06
Emergency run on-
time
2 min / 0 to 255 min
In case of probe failure, the compressor will
cycle for a time defined by G06 & G07
G07
Emergency run off-
time
1 min / 0 to 255 min
In case of probe failure, the compressor will
cycle for a time defined by G06 & G07
Table 12: External temperature sensor –Parameters
Please check that G56 is set to "NO", ie, "no solenoid valve in the liquid line". Also check that no
additional digital inputs are configured (Digital Input DI3; parameter R07 has to be set to "not used"
= nu = 0).

AGL_Unit_ZX_A2L_E_Rev00 15
Adjustable discharge pressure limitation
The controller has dedicated parameters to provide the possibility of adjustable discharge pressure
cut-out.
Parameter
Description
Factory settings
Recommended
settings
E58
Condenser temperature / Pressure
threshold for high alarm
27
Required value
E61
Condenser temperature / Pressure
threshold for alarm recovery
23
Required value
Table 13: Discharge pressure limitations
Low ambient operation
Very low ambient temperatures can result in malfunction of expansion devices because of insufficient
pressure difference. Therefore, pressure cut-out during system start-up can occur. For proper
operation of the expansion devices, the unit running time must allow to build up sufficient condensing
pressure.
At low ambient conditions, the compressor will need to run for a minimum period of time to allow the
system pressures to stabilize. If the unit operates below a defined ambient temperature (ambient
temp. < C12) or if the ambient sensor has failed, the compressor should run for a set period of time
(C14) when it is started based on a low suction reading.
The unit will be turned on for the minimum run time in the following cases:
▪a room thermostat input is closed;
▪the case temperature setting cut-in is reached;
▪the low-pressure input is closed.
The unit will start in any of these cases even if parameter G56 is set to true, ie, the thermostat or
case temperature controls the liquid line solenoid.
If the pressure drops below the cut-out value or the low-pressure input opens, the unit should
continue to run for the remaining minimum on time (C14) or until a satisfactory condenser pressure
is reached (C13).
If a suction pressure transducer is present and the suction pressure falls below a given value (C15)
during the minimum on time (C14), then disregard the timer and shut the compressor off to protect
against vacuum operation.
Defrost
The XCM25D is able to control defrost on evaporators. The controller can handle electrical defrost
or natural / fan defrost (select with parameter G17). The defrost probe (parameter G12) provides the
XCM25D with information about the temperatures in the evaporator.
The intervals between defrost cycles are controlled by parameter G23. This can be done based on
the integrated real-time clock or by fixed intervals.
The following parameters must be adjusted to control defrost in a cooling cabinet or a cold room:
Parameter
Description
Factory settings /
Range
Recommended settings / Comments
A19
Probe 7
configuration
0 = Not used = nu
Evaporator temp (NTC10K) = 5 = EPt
G12
Defrost probe
selection
0 = Not used = nu
5 = Evaporator temperature sensor = EPt
G17*
Defrost type
0 = Electrical = EL
0 = Electrical = EL; 1 = Hot gas defrost (not
available on ZX units) = in;
2 = Natural defrost (pulse defrost) = PLS
G18
Interval between
defrost cycles
4 hours
0 to 120 hours range; adjust to individual
requirements
G19
Maximum duration
of defrost
20 minutes
0 to 255 minutes; adjust to individual
requirements