Trane CXAU Installation and operating instructions

SAFTY WARNING
Only qualified personal should install and service the equipment. The installation, starting up, and servicing of
heating, ventilating, and air-conditioning equipment can be hazardous and requires specific knowledge and training.
Improperly installed,adjusted or altered equipment by an unqualified person could result in death or serious injury.
When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that
are attached to the equipment.
Mayo 2023 PKGP-SVX19A-EN
Confidential and proprietary Trane information
Installation, Operation and Maintenance
CXAU Air-Cooled Modular Chiller /
Heat Pump
R410A
CXAU065/130
690914770002

2PKGP-SVX19A-EN
Preface
Read this manual thoroughly and fully understand all functions of the unit before operating or servicing this unit. Your personal
safety and the proper operation of this machine depend upon the strict observance of these precautions.
Please strictly follow the content of this manual together with unit and other relevant materials at installation and operation.
The “Installation Completion Check Sheet” in the manual will be used to check that all required installation steps are
completed. Do not read “Log and Check Sheets” only instead of reading the IOM manual thoroughly. The IOM manual should
be read carefully before unit installation.
This manual may not fully cover all situations encountered in the installation of this air conditioning units, please contact your
local Trane sales o󰀩ce if you need more detailed information or encounter a specic question from a customer that is not
described in detail in this manual. The contents of the manual are subject to change without notication.
All the installation processes of the air conditioner unit must be completed by professionals complying with national and
local regulations. In this manual, “
!
WARNING” and “
!
CAUTION” marks are given where appropriate, and it is extremely
important to read them carefully and strictly follow them to ensure personal safety and proper operation of the unit.

Preface
3PKGP-SVX19A-EN
Modular Air-Cooled Chiller (Heat Pump) Installation Completion
Check Sheet for Application of Trane Service
Installation Company:
Installation Company Address:
Owner Name/Company:
Contact: Telephone:
Unit Installation Address:
Unit Model:
IDU Barcode:
ODU Barcode:
Dealer: Contact:
Telephone : Fax:
Installation Company : Contact:
Telephone : Fax:
Check List
Please read the installation manual and relevant installation specications before installation
1. Conrmation of the installation
a) Ventilation of the outdoor unit meets the distance requirements in the manual Yes ( ) No ( )
b) Installation meets platform requirements and isolation pads installed for outdoor unit Yes ( ) No ( )
c) Isolation pads installed for indoor unit Yes ( ) No ( )
d) Enough service clearance around the unit Yes ( ) No ( )
e) Not installed in abnormal acidity or alkaline places such as seaside (except for relevant customized
units)
Yes ( ) No ( )
2. Conrmation of the installation of the unit’s electrical system
a) Air switch capacity and power cable diameter meet the requirements of the unit Yes ( ) No ( )
b) Wiring is correct and terminal blocks are pressed tightly without false connections Yes ( ) No ( )
c) Connection of the neutral wire to the ground wire complies with the relevant electrical specications Yes ( ) No ( )
d) Wiring connection between the control line and the power line meets the anti-interference requirements Yes ( ) No ( )
e) ”ON-OFF” warning label is a󰀩xed to the air switch box of the power supply Yes ( ) No ( )
f) Terminal of external water pump overload protection is connected to the pump overload protection
terminal of the host water pump
Yes ( ) No ( )
3. Conrmation of the installation of the chilled water system Yes ( ) No ( )
a) Prohibited to used in direct heating systems application (external continuous water replenishment) Yes ( ) No ( )
b) Designed by professional engineers (e.g. water pipe diameter calculation, etc.) Yes ( ) No ( )
c) The actual chilled water system resistance matches the pump head, and the water ow of the unit
reaches the rated value
Yes ( ) No ( )

Preface
PKGP-SVX19A-EN4
Modular Air-Cooled Chiller (Heat Pump) Installation Completion
Check Sheet for Application of Trane Service
d) The unit-equipped water lter is installed at the water entering of the unit with correct installation
method
Yes ( ) No ( )
e) Equipped with an entering and leaving pressure gauge and a shockproof hose Yes ( ) No ( )
f) Setting for water system make-up valve and exhaust are reasonable Yes ( ) No ( )
g) Equipped with gravity expansion tanks or pressure expansion tanks Yes ( ) No ( )
h) Meet the requirements of the system water capacity by adding an energy storage tank Yes ( ) No ( )
i) The hydroelectric heater installation meets the requirements in this manual Yes ( ) No ( )
j) The chilled water system is cleaned and discharged from the unit Yes ( ) No ( )
k) The chilled water system installed with an automatic exhaust valve and the air is completely dischared Yes ( ) No ( )
l) The chilled water system has been tested by water pressure and ensure that the system does not leak Yes ( ) No ( )
m) Antifreeze protection measures after installing the water system in winter Yes ( ) No ( )
n) Closed-looped water system application only, and NO open water system Yes ( ) No ( )
o) The water ow switch of the unit (except for the unit without ow switch) is closed, or the
temperature di󰀨erence between the entering and leaving water meets the requirements for unit
without water ow switch
Yes ( ) No ( )
4. Conrmation of the installation of the indoor fan-coil system
a) The entering and leaving water valves/2-way valves/3-way valves of the fan coil are designed and
installed correctly and intact
Yes ( ) No ( )
b) Pour water into the condensate tray, the condensate discharge is smooth and there is any leakage Yes ( ) No ( )
c) The condensate pipe insulation is tightly bandaged to prevent condensation on the outer wall Yes ( ) No ( )
5. Conrmation of pre-commissioning preparations
a) The power supply voltage is within the normal range and the three-phase imbalance is less than 2% Yes ( ) No ( )
b) The power supply should not be temporary power supply Yes ( ) No ( )
c) The customer and Party A’s acceptance personnel can be in place in time Yes ( ) No ( )
d) Enough facilities (ladders, lifting tables, etc.) to ensure the normal operation of the operator Yes ( ) No ( )
e) The unit has been powered on for 24 hours before start-up and commissioning Yes ( ) No ( )
6. Other Information
Require Comissioning Date: Before
The company applying for commissioning (stamp)
Signature: Date:

5PKGP-SVX19A-EN
Contents
Preface..............................................................................................................................................................2
Unit Model Number .....................................................................................................................................8
Unit Dimension ............................................................................................................................................9
Operation Map........................................................................................................................................... 10
Installation - Mechanical............................................................................................................................... 11
Pre-Installation Inspection ......................................................................................................................... 11
Lifting and Moving Instructions.................................................................................................................. 11
Mounting Locations ...................................................................................................................................12
Water System Installation..........................................................................................................................15
Circulating water treatment requirements .................................................................................................20
Water ow and pressure drop ................................................................................................................... 22
Installation - Electrical .................................................................................................................................. 23
General Recommendations....................................................................................................................... 23
Power Supply Wiring .................................................................................................................................23
Unit Power Connection Diagram ...............................................................................................................24
Field Wiring Instructions ............................................................................................................................24
Field Wiring Example ................................................................................................................................26
Pre-Start .........................................................................................................................................................27
Controller .......................................................................................................................................................29
Application and Dimension........................................................................................................................ 29
Installation Guide....................................................................................................................................... 29
Centralized Controller with Touch Screen .................................................................................................31
User Operation Guide ...............................................................................................................................33
Alarms and Troubleshooting......................................................................................................................41
Unit Operation................................................................................................................................................42
Start Up Procedures.................................................................................................................................. 42
Long-term Shutdown .................................................................................................................................42
Start the System after Long-time Shutdown.............................................................................................. 42
System Protection .....................................................................................................................................42
Alarm Troubleshooting .................................................................................................................................45
Maintenance...................................................................................................................................................47

6PKGP-SVX19A-EN
Introduction
Read this manual thoroughly before operating or servicing this unit.
Your personal safety and the proper operation of this machine depend upon the strict observance of these precautions.
ATTENTION: Warnings, Cautions and Notices appear at appropriate sections throughout this literature. Read these carefully:
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury.
It could also be used to alert against unsafe practices.
Indicates a situation that could result in equipment or property-damage only accidents.
`
!
WARNING
`
!
CAUTION
NOTICE
`
!
WARNING
●All the installation procedures of the units must comply with national and local regulations.
●Please contact the local sales when installation. The unit should be installed by professional technicians with
qualied certicate. Customers do not install, repair or change installation position of the air conditioner by
themselves. Otherwise, it may cause water leakage, electric shock or re damage.
●Before installation or maintenance, lock the power supply and cut-o󰀨 switch of the unit to avoid personal injury
or death caused by electric shock or contact with moving parts.
●Please install a separate power supply. The voltage uctuation of power supply cannot exceed ±10% of the rated
voltage, and the power supply cables must be separated from the welding transformer, which will cause large
voltage uctuations.
●The installation should be carried out by professional electrician with qualied certicate and in accordance with
the national power standards and the regulations of the local power department. Electrician also need to check
whether the line capacity meets the requirements, and whether the power supply cable is loose or damaged.
●The cover plate of the electric control box must be installed tightly to prevent dust, water, etc. from entering. The
electrical parts must be moisture-proof and enough far away from water sources. Otherwise, it will cause electric
shock, re and other accidents.
●Make sure to install fuse with suitable current intensity. Never use temporary substitutes, such as a stretch of
electrical wire. This may not only damage the unit itself, but also lead to re damage.
●The power supply of the unit and the auxiliary electrical heater must be equipped with electricity leakage
protection devices, and the ground wire must be connected. Otherwise, there may be injuries and even
casualties without protection.
●All auxiliary electric heater should be connected according to the wiring diagram, and direct energization of
auxiliary electric heater will cause the unit loss part of control functions, even damage the unit.
●Please strictly follow the wiring diagram in this manual, incorrect wiring or arbitrarily change the wiring will
cause unit failure, damage of unit or even person.
●All power supply must be cut o󰀨 before contacting wiring equipment or parts.
●Please conrm that the unit is in a power-o󰀨 state before servicing.
●Maintenance should only be carried out by professional maintenance personnel. If maintenance and repair are
required, please contact Trane Sales. Improper maintenance and repair may result in water leakage, electric
shock or re.
●Do not use ammable materials near this product. Do not use organic solvents, such as paint diluent to clean
this product.
●Don’t use organic solvents to avoid cracks, electric shock or re.

Introduction
7PKGP-SVX19A-EN
`
!
WARNING
●Optional parts mush be installed by professionals. Be sure to use the optional parts provided by TRANE.
Improper installation can lead to water leakage, electric shock and re.
●Please do not charge unqualied refrigerants, refrigerant substitutes or refrigerant additives. Incorrect charge
methods or charge of unqualied refrigerants, refrigerant substitutes or refrigerant additives will cause unit
damage and safety hazards. Please select qualied refrigerants. All technicians charging refrigerants must
be qualied and must be familiar with and strictly comply with the relevant technical requirements, laws and
regulations regarding the use, treatment, recovery and recycling of refrigerants
●Smoking and re are strictly prohibited when refrigerant leaks. If the unit does not produce cool or heat properly,
there may be refrigerant leakage and please contact TRANE after-sales
●The refrigerant used in the unit is safe and usually the leaks possibility is very low. If the refrigerant leaks into
indoors, and the refrigerant gets contact with pyrotechnics of heaters, electric stoves, and heaters, toxic gases
will be generated. Please make sure to extinguish the re of burning appliances or other appliances that may
cause re, ventilate the room and contact Trane after-sales.
●Please conrm that the leakage repair is actually completed before running the unit.
●Do not turn on the unit when the panel or protective net is removed. Rotating parts in the unit may cause injure
of human body or other objects.
●Avoid objects such as sticks, sands, or stones to enter the inlet or outlet of grilles. The fan rotating at high
speed is very dangerous.
●The strength of ordinary unit bracket may not be suitable for this product, please choose suitable bracket
according to the design weight. Using of brackets with insu󰀩cient supporting strength may bring hidden
dangers or even cause safety accidents.
●In winter, when the unit was stopped for a short time, make sure to keep the unit powered on to protect the unit
free of frozen. Otherwise, the unit may freeze out.
●Make sure the unit is powered on at least for 24 hours before the unit is start up at the rst time or re-energized
after long time power o󰀨. Otherwise, it may cause the compressor to burn.
●In the season when the unit will not run for a long time, please drain the water and cut o󰀨 the power supply to
save electric energy and extend service life.
`
!
CAUTION
●Do not touch the ns of the heat exchanger. It may damage the ns, cause machine performance degradation or
scratch ngers.
●After installation, air leakage for the pipeline needs to be tested to make sure there’s no leak for the pipeline.
●During running or short period after unit stops, do not touch refrigerant pipes. The pipes can be too hot or too
cold to cause burns or cold injury.
●Do not block or cover the inlet or outlet of grilles. The blockage will result in degraded performance or impact
unit operation.
●There should be a defrost drainage port to ensure the smooth drainage.
●It is recommended to install an outdoor snow shelter to ensure that the unit can run well on snowy days

Introduction
8 PKGP-SVX19A-EN
Unit Model Number
C X A U 1 3 05 B V S A E N N N
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Digit 1 C = Chiller
Digit 2 X = Heat Pump
Digit 3 A = Air-source
Digit 4 U = Modular
Digit 5,6,7 Nominal Cooling Capacity/Heating Capacity
065 = 65 kW
130 = 130 kW
Digit 8 Unit Voltage
5 = 380V/50Hz/3Ph
6 = 380V/60Hz/3Ph
7 = 460V/60Hz/3Ph
Digit 9 Refrigerant
B = R410A
Digit 10 Application
V = VFD unit
Digit 11 E󰀩ciency
S = Super-e󰀩ciency
Digit 12 Design Sequence
A = Factory Assigned
Digit 13 Interface
N = Chinese
E = English
Digit 14 Option
N = None
Digit 15 Controller
N = Without controller
1 = With Controller, 380V
2 = With Controller, 460V
Digit 16 Option (reserved)
N = None

Introduction
9PKGP-SVX19A-EN
Unit Dimension
CXAU065-VS
CXAU130-VS
828
34
145
750 750
1790
840
1690
(147.5)
(426)
(163)
6-Ø10
Install Hole
4-Ø40
Lifting Hole
Inlet Rc2"
Outlet Rc2"
2450
2206
15 1660 4-Ø47
Lifting Hole
1150
288
149
398
1186
1731860
4-Ø12
Install Hole
Control Box
Inlet
Rc2-1/2"
Outlet
Rc2-1/2"

Introduction
10 PKGP-SVX19A-EN
Operation Map
CXAU065/130-VS
Description Scope of application
The ambient temperature range of the unit operation
Cooling: -20~48°C
Heating: -30~48°C
The outlet water temperature range of the unit operation
Cooling: 5~20°C
Heating: 30~55°C
The ambient temperature range of the controller operation -10~60°C
The relative humidity range of the controller operation <90%
Note: The cooling or heating operation of the unit needs to meet the above operating map. Exceeding the operating
range will cause alarm and shutdown or even damage to the unit. Failure or damage of the unit caused by exceeding
operating map will result in paid services in accordance with relevant policies.

11PKGP-SVX19A-EN
Installation - Mechanical
Pre-Installation Inspection
To protect against loss due to damage incurred in transit, perform inspection immediately upon receipt of the unit.
●Whether the nameplate is consistent with the order model.
●Whether the documents along with the unit are complete.
●Whether the accessories along with the unit are consistent with the items listed in the packing list.
●When receiving the unit, please carefully check whether damage has been caused during shipping. If so, please record
it on the delivery note and notify the carrier’s terminal within 72 hours, and at the same time notify the local Trane sales
o󰀩ce.
Lifting and Moving Instructions
Ensure that all the lifting equipment used is properly rated for the weight of the unit being lifted. Each of the cables(chains or
slings), hooks and shackles used to lift the unit must be capable of supporting the entire weight of the unit. Lifting cables(chains
or slings) may not be of the same length. Adjust as necessary for even unit lift.
Failure to properly lift unit in a LEVEL position could result in unit dropping and possibly crushing operator/technician which
could result in death or serious injury, and equipment or property-only damage.
Lift Conguration
Inspection before lifting:
1. Check whether the appearance and xing parts of the unit
are intact.
2. Check whether the unit and the packaging base plate are
well xed.
Recommendation: Remove the package base plate when
lifting to avoid unit falling.
When lifting:
1. Personnel with lifting qualications is required.
2. Thread 2 lifting slings into the hoisting hole at the bottom of
the unit.
●At least 5mm thick paper corner protection between the
rope and the unit panel is required.
●The length of the sling is suitable, and the rope lifting
angle larger than 60°.
`
!
WARNING
Before lifting, special attention should be paid to ensure that the outdoor unit lifts evenly. Special attention should
be paid when weight distribution of the unit is not even, and the center of gravity is inclined on the compressor side.
Pre-lifting should be made to observe whether the sling is tight and whether there’s possibility the unit will tilts when
lifting. Rise slowly and evenly when lifting to prevent the unit from tipping and protect the safety of surrounding
personnel!
Sling
Lifting Angle
Base Package Panel
Unit
Paper Corner
Protection

12 PKGP-SVX19A-EN
Installation - Mechanical
Mounting Locations
1. The unit can be installed on the roof, on the ground or other places where easy to install and can reliably support the
weight.
2. It should not be installed near any heat sources that may a󰀨ect the normal operation of the unit, and there should be no
obstacles near the air exhaust port.
3. It should not be installed in any locations near corrosive or ammable gases.
4. The operating noise and exhaust air should not have an impact on the surroundings.
5. If the unit is installed in a place where non-professionals can reach, it is needed to set up protection isolation.
6. The unit should be installed in places with su󰀩cient ventilation and maintenance space.
7. The unit must be installed on an even, horizontal plane, and the installation platform should meet the requirement of the
weight of the unit and the dimension.
`
!
WARNING
●CXAU series products are commercial-used units. They should not be installed close to noise-sensitive areas
such as residential houses/villas/homestays/nursing homes. If they are needed to install in this kind of place,
please do your own sound insulation treatment.
●The unit should not be installed close to doors and windows. For special requirements, please consult Trane
technical support or after-sales department.
Platform
1. The platform can be steel frame structure, such as channel steel.
2. The platform can be reinforced concrete structure.
3. The platform should be completely horizontal to ensure uniform contact of the unit.
4. The platform should be strong enough to support the weight of the unit.
5. Drainage ditches should be set up around the platform to collect and drain the condensate water generated by the
operation or maintenance and prevent water accumulation around the unit.
Isolators
1. A vibration absorbing isolator should be installed between the platform and the unit, and the thickness of the vibration
absorbing isolator should not be less than 10mm.
2. The type of vibration absorbing isolator is shown in the gure below or a similar type.
Installation Clearance
Please consider drainage, ventilation, and operation clearance when installation to ensure stable operation and maintenance
and repair of the unit. The minimum installation clearance should be met, otherwise there may be problems such as
performance degrade, noise rising, operation failure and hard to maintenance.
`
!
CAUTION
If the specied installation space requirements can’t be met, consult TRANE engineering team or after-sales.

Installation- Mechanical
13PKGP-SVX19A-EN
CXAU065/130 Installation Platform and Clearance
Note:
1. Enough maintenance clearance need to be reserved around the unit.
2. The exaust air at the top of the unit should not be obstructed.
3. The unit should be located outdoors, and the inlet air volume should meet the air volume parameters in the technical
parameter table in this manual.
4. The inlet air temperature should be within the allowable range.
5. The support height of the unit recommended not lower than 200mm.
Air Exhaust
Air In
Service
Clearance
400 mm
Air In Air In Air In Air In
400 mm 400 mm
Service
Clearance
Service
Clearance
300
95
75
680
300
600
300
680
470
570
75
95
75
75
电控位置
Control Box
75
电控位置 电控位置
750
750
145
828
6-Ø10
Install Hole
1186 4-Ø12
Install Hole
1860
173
8-Ø40
Drainge Port
Control Box Control Box

14 PKGP-SVX19A-EN
Installation - Mechanical
CXAU065/130 Single Unit Installation Clearane
CXAU065/130 Multi-Units Installation Clearance
≤900
≥600≥600
≥200
h2
≥600+h2
≥600+h1
≥200
h1 ＞1200
≥200
≥200
＞300
＞
45°
Flow Guiding Device
≥600
≥600
≥
≥
≥600
≥
≥
≥600
≥600
≥≥

Installation- Mechanical
15PKGP-SVX19A-EN
Snow Protection
1. For the installation in the area where there is more snow, it is necessary to raise the unit, and install snow covers to make
sure unit running normally.
2. During heavy snowfall, please check the round-tube-plate-n heat exchanger, if the heat exchanger is covered by heavy
snow, manually clean the snow is needed.
Water System Installation
Pipeline Prefabrication Requirements
1. The pipe diameter of the inlet and outlet of the water system should not be smaller than the size of the joints to the unit.
2. The connections between the pipeline and water pump or air conditioning unit must use exible pipes to avoid the
transmission of vibration.
Pipeline Installation Requirements
Water pipeline connections should comply with relevant installation procedures, and all water pipes must comply with local
piping codes and regulations. Please refer to the schematic diagram for the installation of typical accessories for water
systems. Please strictly abide by the following water system pipeline installation requirements, otherwise it may a󰀨ect the
normal operation of the unit, even warning occurs or unit damaged.
1. Water owrate: The water owrate of the water system must be designed by professionals, to guarantee the water
owrate through the water-side heat exchanger of the unit matches the water owrate required by the unit, otherwise the
heat exchange performance will degrade and a󰀨ect the performance of unit or even bring to unit alarm or shutdown. When
all the terminal FCUs are shut o󰀨 or only one FCU is running, keep the unit running stably for some time to check whether
the water owrate meets requirements. If not, adjust the piping resistance or water pump heads until requirements are met.
Air Flow
≥3M
20°
20°
Snow Cover
≥1.5M ≥1.5M
≥0.2M ≥0.2M
Drainage Tray
≥1M
Channel Steel
Reinforced Concrete

16 PKGP-SVX19A-EN
Installation - Mechanical
2. Water system capacity: The water system capacity will a󰀨ect the number of starts/stops of the compressor, as well as
the defrosting e󰀨ect in heating mode. The minimum water system capacity volume should be met, if not, an energy storage
water tank needs to be installed at the suction port of the water pump to meet requirement.
3. Piping size: It is not allowed to determine the actual pipeline diameter according to the size of the water pipe joint of the
unit ports. The water piping diameter must be designed to ensure the water owrate of the unit.
4. Terminal FCU water owrate: The water owrate at the airside terminal FCUs must be designed by professionals, to
guarantee the water owrate through airside FCUs matches the cooling capacity of the airside terminals.
5. Inlet and outlet pipes: The pipeline must have independent supports and should not be supported by the unit. To avoid
damage to the unit, make sure the inlet and outlet pipes are not installed reversely. The unit inlet pipe must be connected to
the water inlet connector marked “entering water”; The outlet pipe must be connected to the outlet connector marked “leaving
water”.
6. Anti-vibration hose: The connection of the inlet and outlet pipes of the unit must be connected by anti-vibration hoses to
avoid long-distance transmission of noise. If there is an external water pump, the inlet and outlet pipes of the pump must
also be installed with anti-vibration hoses, and make sure water ows into the unit.
7. Water pressure gauge: Pressure gauge and shut-o󰀨 valve should be installed at the inlet of the entering water pipe
and the outlet of the leaving water pipe. If external water pump is installed, the pressure gauge and shut-o󰀨 valve are also
needed to install at the inlet of the pump. In this way, it will help to understand the resistance of the water system and the
pump head, monitor and adjust water owrate, and also convenient to cut o󰀨 the water ow during maintenance.
8. Water lter: A water lter must be installed within 50cm of the water entering pipe of the unit to prevent impurities in the
pipeline from blocking water-side heat exchanger and causing unit failure. The water lter must also be installed at the
inlet of the water pump, and the number of lter mesh holes is 20~40 mesh, to avoid damage to the pump. The water lter
should be installed with the lter screen removal port facing down (the angle between it and the vertical direction shall not
be greater than 30°), to prevent the debris in the lter screen from falling into the lter.
9. Water ow switch: If there is a built-in water ow switch, there is no need to install additional water ow switch.
Otherwise, The water ow switch should be installed on site. The water ow switch must be installed at the water outlet of
the unit with straight distance at least 5 times of the pipe diameter at both the front and rear ends of the water ow switch.
10. Exhaust valve: An automatic exhaust valve should be installed at the highest place of the main supply pipeline and the
main return pipeline of the water system to discharge the air in the water system. The exhaust valve could help the water
owrate of the unit meet the product requirements and avoid noise and damage to the water pump caused by cavitation.
The exhaust valve is generally installed at the top of the connection of between the vertical pipe of the water system and
the horizontal pipeline, and at least 0.5 meters higher than FCU at the highest position. When the exhaust valve is installed
in the horizontal main pipeline, it should be installed on a section of pipe section 2 to 3 times larger than the main pipe, and
there should be at least 4 times the pipe diameter on both sides of the straight pipe, so that the water and air are easy to
separate before discharged through the exhaust valve.
11. Exhaust valve water anti-leakage: Shut o󰀨 measure for the exhaust device should be considered so that the exhaust
valves are easy to be replaced when they are damaged, or function fails. All the exhaust pipes are recommended to be
connected to the pool and oor drain to avoid leaking water damaging room appliances when function failure or water
leakage of the exhaust device.
12. Expansion water tank: An expansion water tank needs to be installed in the water system to compensate the water
pressure uctuation caused by water temperature change in the water supply system. The gravity expansion tank needs to
be installed at the top of the vertical main pipe of water pump. The water make-up pipe should be connected to the return
pipe of the pump, and there should be an overow device. Alternatively, a pressure-type expansion tank with an automatic
make-up valve and an automatic pressure relief valve can be installed on the main return pipe. The capacity volume of the
expansion tank can be 3% of the total water volume of the air conditioning water system.
13. Operating water pressure: The water pressure of the water-side heat exchanger shall not exceed the maximum working
pressure 1MPa (except for specially designed products) to avoid damage to the water side parts.
14. Two-way/three-way valve installation: Two-way valve or three-way solenoid valve must be installed at the outlet of the
FCU to avoid customer’s complaints of water vibration noise.
15. Two-way valve installation: The water system cannot use two-way solenoid valve only. If two-way valves need to be

Installation- Mechanical
17PKGP-SVX19A-EN
used, they can be used with combination of three-way valves, and the quantity of two-way valve could be 1/3 of total valves
and the quantity of three-way valves could be 2/3 of total valves. Two-way valves should be installed for the FCUs which
are near to the unit, and three-way valves be installed for the FCUs which are far from the unit. If only 2-way valves used, a
di󰀨erential pressure bypass valve should be added between the main pipes of the supply line and return line.
16. Di󰀨erential pressure bypass valve: When di󰀨erential pressure bypass valve is used in the system, it must be ensured
that an energy storge water tank should be included in the bypassed short circulation circuit, and the water owrate in the
short circulation circuit must also meet water requirements. When all the FCUs are shut o󰀨 and the two-way valve is shut
o󰀨, the opening degree and bypass owrate of the di󰀨erential pressure bypass valve can meet the water ow requirement.
17. Connect of multiple units in parallel: When two or more units are installed in parallel, it is recommended to install a
water collector and distributor on the main return water pipeline to ensure the correct ow distribution of return and supply
water. When units with di󰀨erent capacities are connected in parallel in a water system (not recommended), hydraulic
balancing valves must be installed to ensure the di󰀨erent water owrate for di󰀨erent units met requirement. The units in
parallel should be installed with reversed return water system.
18. Check valve: If the unit locate in a lower position of the entire water system, a check valve should be installed on the
outlet of the unit to prevent unit damage from water hammer.
19. Bypass pipeline: Bypass pipelines and bypass valve should be installed between the water inlet and outlet of the unit. All
external water supply piping should be thoroughly ushed before the unit connected to the pipelines. It is strictly forbidden
to mix impurities in the water system, otherwise it may cause serious consequences. When ushing, the bypass valve
should be open to bypass the unit and the heat exchanger. After ushing, close the bypass valve and open the drain valves
on the inlet and outlet pipes of the unit.
20. Drainage: The lowest point of the water system and other lower part of the equipment that needs to be drained should
be installed with drainage pipes and drainage valves, and be connected to the drain or funnel to facilitate the cleaning and
maintenance of the water system. The schematic diagram of the installation of the drain valve and lter (inlet) is as follows:
21. Insulation: The chilled water pipeline should be insulated to prevent the loss of cooling and heating capacity and dripping
water due to condensation on the surface of the pipeline. The water side part of the water system that is in contact with
air should be insulated to prevent condensation and dripping. All the water system components that may be damaged by
freezing in winter should be insulated, and insulation thickness should prevent freezing even at the lowest local ambient
temperature. The water make-up pipelines of the gravity expansion tank or the automatic water supplement valve pipelines
of the pressure expansion tank should be su󰀩ciently insulated or installed in a suitable place indoors to avoid freezing
damage.
Filter
Removal Port
30° 30°
Max Angle 30°
Drainage Valve
Facing Down
22. Anti-freeze: When the ambient temperature is low and the unit is not used for a long time, please drain the water inside
the unit to avoid freezing water-side parts. If the water is not drained, DO NOT cut o󰀨 the power supply, and ensure that the
unit can operate normally, so that the unit can automatically operate with antifreeze function. If there is a fault alarm that
cannot be repaired in a short time, then be sure to drain the water. The cooling-only chiller unit must drain the water in the
system in winter to prevent water in the system from freezing components such as the water pipes, water pump and heat
exchanger. Ethylene glycol must be added to cooling-only chiller at low ambient temperature (below 0 °C). Other antifreeze
methods are not recommended, and any damage caused by non-recommended antifreeze methods is not covered
by warranty. For schematic diagram of the installation of antifreeze drain valves, see No. 20 of the pipeline installation
requirements.
23. Supply water temperature control: If the unit adopts supply temperature control, there must be a position for installing

18 PKGP-SVX19A-EN
Installation - Mechanical
a temperature sensor on the main supply pipe of the water system so that the supply water temperature sensor of the
system can be installed.
24. Hydraulic Test: After the installation and connection of the water system pipeline, hydraulic test should be carried out.
The accuracy of the pressure gauge should be higher than 0.01MPa, and the test pressure is 1.5 times the highest working
pressure. If the hydraulic test is done together with the heat exchanger of the unit, the maximum test pressure must not
exceed 1.0MPa (except for specially designed products) to avoid damage to the components on the chilled-water side of
the unit. The exhaust valve must be opened when lling water, and then closed after the air fully exhausted and water fully
lled. If a leakage occurs in the hydraulic test, it must be repaired immediately, and then do the hydraulic test again until no
leakage happens.
25. Cleaning: The water system must be cleaned before the unit is started or debugged. When cleaning, the water system
must be separated from the unit, and the water system must be circulated and cleaned separately to ensure that the water
system is free of impurities. Then the water system can be connected to the unit for start-up and debugging. The water lter
needs to be cleaned regularly depending on the cleanliness of the water system during the operation of the unit to avoid
the performance degrade of the unit caused by water ow being too small, or even the stop of the unit caused by water ow
alarm or antifreeze protection alarm of the unit.
26. Control wiring of external water pump: The external water pump needs to be equipped with a starter, for which the
control wiring must be connected to the output of the water pump of the host unit. The water pump control should be linked
with host unit to ensure the automatic protection function of the unit.
27. Installation schematic diagram of closed-type constant-ow water system (air conditioning application)
Auxiliary Electric Heater
（Optional)
Terminal
Closed Type
Water Tank
Soften Water
Device
Constant Pressure
Water Make-up
Filter
Shut-off
Valve
Water Pressure.
Sensor
Temp. Sensor D.P
Bypass
Valve
Pump Anti-vibration
Flexible Connection
Drain
Valve
Three-way
Valve
Two-way
Valve
Auto Exhaust
Valve
Water pump is configured according to actual situation.
Note⑤
Note②
Host Unit
Slave Unit 1
Slave Unit N
Terminal
Terminal
Terminal
Technical Notes:
When multiple units are connected, reversed return water system should be applied to ensure the uniformity of the water ow
of the unit.
1). When multiple units are connected, reversed return water system should be applied to ensure the uniformity of the water
ow of the unit
2). when cleaning the water system, it is necessary to shut o󰀨 all the shut-o󰀨 valves at entering and leaving the unit, and open
the bypass valve to avoid impurities in the water system from entering the unit and a󰀨ecting the life of the unit.
3). The default control of the unit is entering water temperature control, in-build ow switch exists in most models.
4). For those unit with a three-way valve or two-way valve installed on terminals, the water ow through the operating unit
should meet the requirement of the unit at any running time.
5). For variable water ow system, two-way valve should be installed at entering port the unit and connected to the PCB
board of the corresponding unit, refer to the electrical diagram interface of the unit. The two-way valve is not requested for
constant water ow system.

Installation- Mechanical
19PKGP-SVX19A-EN
6). The ow speed of the water of the unit should not be too large, otherwise the friction resistance is too large. The general
friction resistance range is 100~300Pa/m, and the optimal range is 150~200Pa/m. Piping size is recommended according
to the following speed.
Diameter 25 32 40 50 70 80 100 125 150 200 250 300 350 >400
Speed (m/s) <0.5 0.5-0.6 0.5-0.7 0.5-0.9 0.6-1 0.7-1.2 0.8-1.4 0.9-1.6 1.0-1.8 1.2-2.1 1.4-2.3 1.6-2.4 1.8-2.6 1.9-2.8
7). The water capacity of the unit should meet the minimum water capacity, refer to the following table. Minimum capacity
of the water storage tank = minimum water capacity of the unit - water pipeline capacity - water capacity of the airside
terminals. When only single unit is running, the minimum e󰀨ective water capacity should be multiplied by the coe󰀩cient:
rated water ow / actual water ow.
Unit Entering Temp.
Setting (oC)
Minimum Water
Volume (L) Unit Entering Temp. Setting (oC)
Minimum Water
Volume (L)
CXAU130
15 480
CXAU065
15 680
14 545 14 820
13 630 13 1020
12 740 12 1360
11 740* 11 1360*
10 740* 10 1360*
* When the setting value of entering water temperature is lower than the default value, the antifreeze protection temperature
needs to be decreased accordingly.
`
!
CAUTION
●The automatic exhaust valve should be installed at the highest point of the pipeline, and the water pipe diameter
at the installation point should be expanded.
●The drain valve should be installed at the lowest point of the pipeline to facilitate the drainage.
●The reversed return water system design facilitate uniform distribution of water ow.
●The FCU near the inlet and outlet of the unit should be equipped with a two-way valve to avoid short circuit.
●The appropriate working water capacity can ensure the normal defrosting in winter and the minimum operating
time of the unit.
●The system must be equipped with an automatic water make-up valve. The system should be equipped with an
automatic exhaust valve at the highest point of the pipeline.
●A three-way valve should be installed at every far end FCU (except the largest FCU) to avoid low water ow
alarm.
`
!
WARNING
All external water piping systems should be thoroughly ushed before the main unit is connected to the external
water piping system. Any impurities are strictly forbidden in the water piping system. Otherwise, any failure or
damage of the unit will cause the customer paid services in accordance with the company’s relevant policies.
28. Variable Water Flow Control
If variable water pump is equipped, the water system needs to control the variable water ow rate. It is necessary to install the
water solenoid valve only for the slave units and connect it to the SV2 point in OUT6 of the unit control board (active).No water
2-way valve is needed for the host unit. A di󰀨erential pressure bypass valve should be installed in the main water pipeline to
ensure that the water ow through the running unit meet requirements.
The frequency could be controlled according to the number of units, water pressure drop, etc. And the switch of the variable
water pump needs to be connected to the MP point in OUT1 of the host unit control board (passive).

20 PKGP-SVX19A-EN
Installation - Mechanical
SV-1
SV-N
Return Water
Supply Water
Host Unit
Slave Unit 1
Slave Unit N
29. Installation of total leaving water temperature sensor
a). The total leaving water temperature sensor should be placed in the straight pipe section at a distance of more than 2m
from the water outlet, not on the elbow, and more than 1m away from the elbow to ensure uniform temperature mix at the
water outlet; For hot water application, the probe needs to be installed lower than the hot water tank.
b). When the total leaving water temperature probe sleeve is installed in the water pipeline, the depth of the inserted water
pipe should be 2/3 of the diameter of the water pipe, and it should be installed in the horizontal of the water pipe; When
the total leaving water temperature probe sleeve is installed in the hot water tank, the probe sleeve needs to be inserted in
the lower position of the side of the tank.
c). After the total leaving water temperature probe is inserted, the sleeve should be lled with heat transfer silica gel and
covered with waterproof material to prevent water from entering the sleeve.
30. Waterway auxiliary electric heater (customer-installed)
When unit is in heating mode, if the leaving water temperature is less than the setting by 8°C, turn on the electric heater. When
the leaving water temperature increases higher than setting valve minus 2.5°C, turn o󰀨 the electric heater.
Circulating water treatment requirements
Water quality requirement
Items Unit Allowable Value Trend
Corrosion Fouling
Benchmark
PH Value (25°C) 7.5-9.0 ○
Conductivity (25°C) μS/cm <800 ○
Chloridion Cl- mg/L <200 ○
Sulfate ion SO4
2- mg/L <200 ○
Acid Consumption
(PH=4.8)
mg(CaCO3)/L <100 ○
Full Hardness mg(CaCO3)/L <200 ○
References
Ferrum Fe mg/L <1.0 ○ ○
Ammonium Ion NH4+ mg/L <1.0 ○
Silicon Oxide SiO2mg/L <50 ○
Residual Chlorine Cl2mg/L <1.0 ○
Dirt, Oil, grease and other impurities will a󰀨ect the heat transfer and unit performance. Foreign substances in the chilled water
will increase the water pressure drop, reduce the water ow, and cause blockage or mechanical damage of the heat exchanger.
Please test water quality strictly according to the water quality requirements to ensure that the water quality entering the water
system meets the requirements in the above table.