Eaton MDC User manual

Eaton Micro Data Center
Split rack air conditioner
User manual

ii SPLIT RACK AIR CONDITIONER USER MANUAL UM.ICUBE2.0-SRAC.SG.0822 August 2022 www.eaton.com
DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITY
The information, recommendations, descriptions and safety notations in this document are based on Eaton
Corporation’s (“Eaton”) experience and judgment and may not cover all contingencies. If further information is
required, an Eaton sales office should be consulted. Sale of the product shown in this literature is subject to the
terms and conditions outlined in appropriate Eaton selling policies or other contractual agreement between Eaton
and the purchaser.
THERE ARE NO UNDERSTANDINGS, AGREEMENTS, WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING
WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY, OTHER THAN THOSE
SPECIFICALLY SET OUT IN ANY EXISTING CONTRACT BETWEEN THE PARTIES. ANY SUCH CONTRACT STATES
THE ENTIRE OBLIGATION OF EATON. THE CONTENTS OF THIS DOCUMENT SHALL NOT BECOME PART OF
OR MODIFY ANY CONTRACT BETWEEN THE PARTIES.
In no event will Eaton be responsible to the purchaser or user in contract, in tort (including negligence), strict
liability or other-wise for any special, indirect, incidental or consequential damage or loss whatsoever, including
but not limited to damage or loss of use of equipment, plant or power system, cost of capital, loss of power,
additional expenses in the use of existing power facilities, or claims against the purchaser or user by its customers
resulting from the use of the information, recommendations and descriptions contained herein. The information
contained in this manual is subject to change without notice.

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Table of Contents
1. Introduction of the unit ..............................................................3
1.1 Product introduction....................................................................... 3
1.2 Unit outline drawing ....................................................................... 3
1.3 Nomenclature............................................................................ 5
2. Unit installation.....................................................................6
2.1 Unit inspection ........................................................................... 6
2.2 Unit storage ............................................................................. 6
2.3 Unit handling ............................................................................ 6
2.4 Installation space ......................................................................... 7
2.5 Environmental requirements ................................................................ 9
2.6 Unit installation........................................................................... 9
2.6.1 Installation and inspection tools ........................................................ 9
2.6.2 Installation material preparation ....................................................... 12
2.6.3 Outdoor unit installation ............................................................. 13
2.6.4 Indoor unit installation .............................................................. 14
2.7 Pipeline connection ...................................................................... 15
2.8 Installation of drain pipe ................................................................... 19
2.9 Vacuum and refill frozen oil ................................................................ 20
2.10 Refrigerant charging ...................................................................... 21
2.11 Electrical wiring ......................................................................... 22
3. Unit operation .....................................................................28
3.1 Common tools .......................................................................... 28
3.2 Power supply and instrument inspection ...................................................... 28
3.3 Refrigeration system inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.4 Unit commissioning ...................................................................... 28
3.5 Unit shutdown .......................................................................... 29
3.6 Daily operation inspection of unit............................................................ 29
3.7 Test record and form ..................................................................... 29
4. Unit maintenance ..................................................................30
4.1 Maintenance............................................................................ 30
4.2 Simple fault handling ..................................................................... 31
5. Manual operator (optional kits) .......................................................32
5.1 Introduction to the manual controller......................................................... 32
5.2 Welcome page .......................................................................... 33
5.3 Main page ............................................................................. 33
5.4 Switch on and off the machine ............................................................. 33
5.5 Main menu ............................................................................. 34
5.6 User Setting ............................................................................ 34
5.6.1 Environmental state ................................................................ 35
5.6.2 Equipment status .................................................................. 36
5.6.3 Protective state.................................................................... 38
5.6.4 Unit running time .................................................................. 39

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Table of Contents
5.7 Fault handling ........................................................................... 40
5.7.1 Fault list ......................................................................... 40
5.7.2 Fault viewing...................................................................... 43
5.7.3 Fault reset........................................................................ 43
5.7.4 Fault record....................................................................... 43
5.8 Start and stop record ..................................................................... 44
5.9 Rotation setting ......................................................................... 45
6. Instructions for installation and use of low temperature kits ..............................47
6.1 Application situation ...................................................................... 47
6.2 Dimension of low temperature kits .......................................................... 47
6.3 Schematic diagram for internal structure of low temperature kits................................... 47
6.4 Schematic diagram of system with low temperature kits ......................................... 48
6.4.1 Low temperature kits are installed indoors (recommended) ................................. 48
6.4.2 Low temperature kits are installed outdoors ............................................. 48
6.5 Pipe diameter, vacuum, refrigerant filling and addition of frozen oil ................................. 49
6.5.1 Connecting pipe diameter of low temperature kits ........................................ 49
6.5.2 Vacuum .......................................................................... 50
6.5.3 Refrigerant charge ................................................................. 51
6.5.4 Add frozen oil ..................................................................... 51
7. Declaration of toxic and harmful substances in products..................................52

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Warning
The rack air conditioner is a precision air conditioner, so all unit maintenance work must be carried out in strict
accordance with the company’s installation instructions. The customer shall not disassemble and assemble the
unit casually. If the operation procedure is incorrect, it may cause serious damage to the system.
Preface
The product strictly implements the relevant design and production standards during production to ensure the
good quality and the reliable performance of the unit. The purpose of this manual is to provide guidance to
operators/maintenance personnel who need special training. This manual includes the necessary procedures for
correct installation, commissioning and maintenance. Please read this installation manual carefully before starting
or overhauling the unit.
The company shall not be responsible for any personnel injury or machine damage caused by improper
installation, commissioning, use and maintenance due to failing to comply with the provisions of this specification.
Potential danger
Air conditioning equipment is a relatively complex equipment, in the process of installation, operation and
maintenance, personnel may have to come into contact with some parts or environment, such as refrigerant,
lubricating oil, moving parts, high and low voltage power supply, etc. If not handled properly, it may lead to
personnel casualties. operators/maintenance personnel have the responsibility to pay attention to these potential
hazards, do a good job of self-protection, and ensure that the task is completed safely.
Manual update
Our company adheres to the idea of constantly improving and optimizing our products, so the contents of this
manual are subject to change without prior notice. If necessary, please ask our company or local office for relevant
information.
Safety warning
I. Safe Handling
The handling of the unit shall follow the relevant local laws and regulations and strictly abide by the following
provisions:
•The equipment must be carried by trained personnel.
•When handling, it is strictly forbidden to use the parts as the pressure point to prevent damage to the parts.
•If you accidentally drop it in the process of handling, please stand the unit upright for 24 hours and then turn on
the system, otherwise it will cause damage to the unit.
•Dropping is not allowed during transportation, otherwise the pipeline and compressor mats will be damaged.
•When pulling equipment out of the cabinet, be careful to install equipment that may be unstable or heavy on
the cabinet to avoid crushing or smashing.
II. Installation
The installation of the unit shall follow the relevant local laws and regulations and strictly abide by the following
regulations:
•If the installation location of indoor and outdoor units is appropriate, the unit must be installed in a place where
there is no sunlight, far away from heat source or flammable, explosive, easy to pollute or the surrounding
environment is toxic or other dangerous and well ventilated.
•Ensure that the unit is installed horizontally so that the condensate can be discharged smoothly.
•There should be sufficient spacing around the unit to ensure smooth air flow. The outlet of the outdoor unit should
not face the direction of strong wind, and the distance between the inlet side and the outlet side should meet the
distance indicated in this document. If the air outlet space is not enough, it is necessary to install a curved duct to
guide the wind far away, so as to avoid the short circuit of air flow and affect the performance of the unit.
•The power supply used in this unit is 220V single-phase power supply and is compatible with 50Hz/60Hz. The
power supply line of the unit must match its power and install safety devices such as air switches and fuses. In
order to ensure the reliability and safety of electrical equipment, it must be reliably grounded.

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III. Commissioning and operation
•The commissioning of a new machine must be carried out by a service engineer designated or
approved by our company.
•Check whether there are any left-over items and tools before turning on the machine, and inform the people
around the crew to pay attention to safety when starting up.
•When the unit is under remote control, the machine may start at any time and a reminder should be
sent to personnel.
•There is a failure or the existence of unsafe factors, do not force the unit to start. At this time, the power
supply should be cut off.
•The unit should be used according to the normal operating range as follows:
•Outdoor ambient temperature:-20℃~ 45℃; there is no corrosive and explosive gas in the air. (Low
temperature components are required when the temperature is below -20℃).
•Indoor ambient temperature: 18℃~ 45℃; maximum humidity is 80% RH, and there is no
condensation.
The air conditioner should not run beyond the above range for a long time, otherwise it may damage the air
conditioner or cause safety accidents.
VI. Maintenance and repair
The maintenance and repair of the unit must be carried out under the guidance of qualified personnel.
•The electrical appliances of the unit are dangerous. During maintenance or repair, it should be confirmed that
the power supply has been cut off, and warning signs such as “overhaul” or “do not open the gate” should be
hung at the power supply to prevent injury.
•When cleaning parts of the unit, non-corrosive safety solvent should be used, and the use of flammable,
explosive and volatile cleaning agents is strictly prohibited.
•After the unit has been in operation for a certain period of time, it must be inspected regularly. Eaton
recommends the inspection to be done once a year.
•The spare parts of the unit must be provided by the factory, the compressor oil must be recommended for us
by Eaton, and the mixing of two different brands of oil is strictly prohibited.

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Introduction of the unit
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1. Introduction of the unit
1.1 Product introduction
The rack air conditioner is mainly used for the close distance cooling of the rack server and other IT equipment.
The air conditioner is embedded into the rack. It is efficient, energy-saving, safe and reliable. In addtion, it comes
with intelligent management and a compact structure. All of which will help meet the cooling needs of the rack.
1.2 Unit outline drawing
1. Outline drawing of E04SE unit
The standard size of E04S is 217 mm × 440 mm × 760 mm (height × width × depth).
Figure 1.1
2. Outline drawing of E08SE unit
The standard size of E08SE is 350 mm × 440 mm × 760 mm (height × width × depth).
Figure 1.2

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3. Exterior drawing of EW06E air-cooled outdoor unit
Figure 1.3
4. Exterior drawing of EW10E air-cooled outdoor unit
Figure 1.4
•The outline of the unit may vary depending on the machine model and requirements selected by the user.

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Introduction of the unit
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1.3 Nomenclature
Table 1 Description of indoor unit model
Sequence 1 2 3 4
Code E04 S E
Sequence Meanings Codes Description
1Series name EEATON brand rack type special air conditioner for small computer room.
E: EATON
2Cooling capacity 04, 08 Cooling capacity level, such as 04 for 4 KW
3Air conditioning styles S: split type
4In China or oversea model EE: oversea model
Table 2 Description of outdoor unit model
Sequence 123
Codes EW 06 E
Sequence Meanings Codes Description
1Series name EW E: EATON brand special outdoor air conditioner for computer room.
W: outdoor unit
2Heat exchange capacity 06, 10 Heat exchange capacity level, such as 06 for 6 KW
3In China or oversea model EE: oversea model

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2. Unit installation
2.1 Unit inspection
After the arrival of the goods, the unit should be checked if all the main parts and the packaged parts have been
received, and the parts of the unit should be inspected on the truck and checked for visible damage before
unloading. If any missing parts are found, the carrier should be informed immediately to inspect.
Eaton Corporation is not responsible for the damage or loss of parts caused by transportation or from the
construction site. The unit should be checked against the packing list at the site. If there is any shortage, please
inform Eaton Corporation immediately.
2.2 Unit storage
After acknowledging the receipt of the unit, the customer shall bear the responsibility for the correct custody and
installation of the unit.
NOTICE
If the unit needs to be stored before installation, the following preventive measures should be taken:
- Ensure that all openings such as water pipes and copper pipes have protective covers.
- Store the unit in a dry and vibration-free place with less personnel activity.
- Rain-proof measures should be taken when it is stored outdoors. Do not expose unit to the sun.
- If there is ash/dust on the unit, do not wash it with steam or water.
- The unit should be inspected regularly during storage.
2.3 Unit handling
The outdoor unit has a compressor, so the balance of the body should be maintained in the process of handling,
and the left and right tilt angles of the air conditioner should not exceed ±15 ° in the process of loading and
unloading, as shown in the following figure: 2.1.
Figure 2.1
In the process of unloading and handling, mechanical handling tools should be selected as far as possible, such
as forklifts. Please position the fork in the middle position

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2.4 Installation space
Indoor unit:
The rack air conditioner indoor unit is installed at the bottom of the IT equipment cabinet so when installing the
IT equipment cabinet, do ensure that there is enough space around the installation location to prepare for the
operation and maintenance of the air conditioner indoor unit.
The recommended installation space dimensions for server cabinets with rack air conditioner are shown in the
following figure: 2.2.
Figure 2.2
Outdoor unit:
The installation space requirements for outdoor units are shown in the following
The distance from the
wall is greater than
300mm.
The distance from
the wall is greater
than 500mm.
The distance
from the wall
is greater than
300mm.
Figure 2.3

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The air outlet
side is greater
than 2000mm. The air inlet
side is greater
than 2000mm.
Figure 2.4
4-M8X30 anchor bolts
4-M8X30 anchor bolts
Figure 2.5 Figure 2.6
Schematic diagram of outdoor unit positioning
Unpacking of the unit:
After the unit is transported to the floor or foundation of the installation unit, remove the package and remove the
desiccant from the unit.
Release nitrogen:
Open the gas circuit and liquid circuit globe valves of the indoor unit with 5mm inner hexagon spanner,
respectively, and connect the pressure gauge to exhaust on the gas path needle valve and the liquid path needle
valve respectively. Please check the vacuum section(2.8) for specific valve location. The complete nitrogen release
operation must be carried out after the copper pipe connection of the indoor unit is completed. Open the cutoff
valve of the indoor unit and outdoor unit, and then connect the pressure gauge to exhaust, otherwise more frozen
oil can spew out, or the nitrogen discharge operation will be release in the outdoor unit.
NOTES
- If there is no nitrogen released, please contact Eaton Corporation.

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2.5 Environmental requirements
Operation environment
Projects Requirements
Ambient temperature Indoor: 0℃~ 40℃.
Outdoor: - 20℃~ + 45℃(ordinary type).
- 40℃~ + 45℃(low temperature type)
Protection level (outdoor unit) IPX4
Elevation < 1000 m, please consult Eaton Corporation for > 1000m units.
Storage environment
Projects Requirements
Storage environment Indoor, clean (no dust, etc.)
ambient humidity 5％~ 85％RH (no condensation)
Ambient temperature －20℃~ 54℃
Storage time The total transportation and storage time should not exceed 6 months, and the
performance needs to be re-calibrated after 6 months.
2.6 Unit installation
NOTES
- The impact on the appearance of the building should be taken into account in the installation of outdoor
units.
- The installation location should be chosen as far as possible where the pipeline is short, the bend is less
and the height difference is small.
- When the outdoor unit is not on the ground or the roof plane but is suspended on the wall, a solid and
reliable bracket should be made.
2.6.1 Installation and inspection tools
The main tools and their specifications that may be used for the installation and maintenance of precision air
conditioners are shown in the table below. The specific types and specifications of tools used or carried shall be
determined by the installation and maintenance personnel according to the actual situation.

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Tool names Schematic diagrams Specifications Usage
Pressure gauge Low voltage test range:
-0.1~3.6 MPa (- 30~550 Psi).
High voltage test range:
-0.1~5.5 Mpa (- 30~800Psi).
Accuracy level: 1.6
It is used to check the pressure of the
system and judge whether the system is
normal or not.
Refrigerant hose R410A specification, ≥ 2. Wall
thickness, ≥ 12mm. Impervious grade,
RMA-A
Vacuum, replenish / charge refrigerant.
Check system pressure
Refrigerant DuPont SUVA R410A is recommended Charge / replenish refrigerant
Electronic weighing Resolution, ≤ 5g.
Accuracy, ± 5%.
Built-in solenoid valve, automatic
quantitative injection
Charge / replenish cold refrigerant
weighing
Vacuum pump R410A special vacuum pump with
solenoid check valve. Absolute
pressure of 12Pa
Vacuumizing for installation / maintenance
system
Inner hexagonal
spanner
5mm（5#）Open / close globe valve
Cutter Suitable pipe diameter, 4~28mm Copper tube cutting
Used for cutting copper tubes
Scraper —— Polished the machined surface of copper
tubes

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Tool names Schematic diagrams Specifications Usage
Pipe bender Suitable pipe diameter,
6.35~12.7 mm
Used to bend pipes when arranging
on-line pipes
Copper tube expander
(trumpet mouth)
Eccentric tube expansion Copper tube processing.
For expanding the trumpet mouth, used to
connect with the globe valve
Copper tube expander
(copper pipe
connection)
Tube expansion for cup mouth For on-line tube flaring, for the connection
between on-line pipes
Live wrench —— It is used to fasten the connection
between the napkin cap and the globe
valve.
Torque wrench Torque range, 20 ~ 110 N·M It is used to fasten the connection
between the napkin cap and the globe
valve.
Cross screwdriver —— ——
Welding torch,
acetylene, oxygen
—— For copper pipe welding

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Tool names Schematic diagrams Specifications Usage
Silver brazing rod Low silver electrode should be
selected, ≤ 20% Ag
For welding copper pipe
Pliers Special welding pliers For welding clamp pipe
Tape measure Measuring range, ≥ 5m Measure installation size and installation
distance.
Measure the length of copper tube
Multimeter Digital display clamp current meter It is used to check the voltage of the
power supply and judge whether the
power supply is normal or not.
It is used for starting and debugging
to check whether the current of the
compressor is normal.
Horizontal ruler —— Leveling during installation
Wire pressing forceps Used for crimping OT segments and tube
terminals
Press OT segments, tube terminals, etc.
2.6.2 Installation material preparation
Serial number Specifications Remarks
The indoor and outdoor units are connected with
copper pipes and related thermal insulation.
Please refer to “2.6 Pipeline connection” to
select the relevant specifications.
It is related to the type of the unit and the length of the
pipe.
Gravity drain pipe Hard PVC pipe: outside diameter f 22x6 mm
Strong drain pipe Soft PVC tube: outside diameter f7x3mm
Gravity drain pipe adapter PVC pipe adapter: G1 / 2” external thread
joint
Match with gravity drain pipe
Strong drain pipe adapter Double pagoda adapter: outside diameter
f4mm
Match with strong drain pipe
Indoor unit power cord 3x2.5 mm2
The power cord to connect the indoor and
outdoor units
3x2.5 mm2
The signal lines to connect the indoor and
outdoor units
2x2.5 mm2
Power terminal M4 OT Terminal Connect the outdoor unit side
Power terminal E2512 - E1512 Tubular terminal Connect the indoor unit side

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Serial number Specifications Remarks
Refrigerant R410A The oversea type is not has the
refrigerant in the unit. It must been charged in the field.
Frozen oil FV50S The additional is required when
connecting copper tubes more than 10m or adding
cryogenic components
Oil storage bend Please refer to “2.6 Pipeline connection” When the outdoor unit is higher than
the outdoor unit by more than 6, the oil bend should be
installed every 6-7.5 m.
2.6.3 Outdoor unit installation
•External unit bracket installation
Use the level meter and tape measure to find the position of fixed holes on the wall, and fix them with expansion
bolts. Noticeably the bolts must not be used less. The installation bracket must be horizontal, and the hole spacing
between the left and right brackets and the air conditioner base should be the same.
Figure 2.7
1. First fix the left bracket with one M10X100 or more bigger expansion screw.
2. After determining the level with a horizontal ruler, put other bolts on the other side.
3. Then put the outdoor unit on the installed bracket.
4. Tighten all the M8X30 anchor screws.
ote:N
1. Install the bracket with crossbeam produced by the manufacturer.
2. When assembling the bracket, the bolts should be pierced from top to bottom, and all should be tightened
with a wrench.
3. When the installation surface is wood and other with not sufficient structural strength, measures such as rein-
forcement, support and reduction vibration should be adopted.
4. Avoid rainy and snowy days as far as possible during installation, and wear seat belts and other protective
measures when installing more than 2 meters in height to ensure the personal safety of installers and avoid
harm to others.
•Connect pipes for the outdoor units
1. The wrench unscrews the large and small valve nuts, and the copper pipe trumpet is aimed at the center of the
globe valve.
2. First screw the tube nut by hand until it cannot be turned, then tighten it with a wrench.

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Figure 2.8
ote:N The speed of the whole docking process should be as fast as possible as fast as possible to avoid residue
from entering the system.
•Connect the power cord of the external unit
1. Remove the handle of the external unit, remove the screws of the wire clamp, and disassemble the wire
clamp.
2. First connect the connecting line according to the line diagram, and then press it with a fixed wire clamp.
3. Tidy up the wires, put the excess wires into the outdoor unit, cover the handle, and tighten the screws.
4. Coil the excess pipeline behind the external unit, arrange the direction of the pipeline to ensure that the
connecting pipe is horizontal and vertical. Do not touch the wall or the bracket, etc.
2.6.4 Indoor unit installation
The indoor unit is installed at the bottom of the rack and is fixed to the rack with M6 bolts to prevent the air
conditioner from moving.
The installation diagram of E04SE indoor unit is as follows:
modeFix with
M6 bolts
modeFix with
M6 bolts
Upstream air supply installaon mode Front air supply installa on mode
Figure 2.9 Figure 2.10

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The installation diagram of E08SE indoor unit is as follows:
Fix with M6 bolts
Fix with M6 bolts
Upstream air supply installation mode Front air supply installation mode
Figure 2.11 Figure 2.12
Unit sealing plate
The unit installed with upper air supply needs to install front sealing plate and side sealing plate. If it is used for
front air supply, it is installed with sealing plate and side sealing plate. When it needs to be used in the cold pool
of multi-cabinet, it is recommended to keep only one air outlet for better results. That is to say, only the upper
air supply port is retained and the other ports are sealed or only the front air supply port is retained and the
installation mode of front air supply is adopted.
E04SE E08SE
The effect after installation is as follows: The effect after installation is as follows:
Sealing plate Sealing plate
Figure 2.13 Figure 2.14
ote:N The sealing plate is been installed in the factory.
2.7 Pipeline connection
Pipeline cleaning
Ensure that the pipeline is clean and free of rust, oxide scale, sand, oil, etc. During the installation and
maintenance of the unit, the pipeline need be cleaned if necessary.
1. Cleaning of copper pipe
If there are impurities such as oxide scale in the copper tube, it can be washed with nitrogen or dry compressed
air. In the process of maintenance, there is a lot of oil in the copper pipe, so an appropriate amount of
trichloroethylene or carbon tetrachloride can be added and purged after the oil is dissolved, but attention should be
paid to indoor ventilation to prevent operator poisoning.
2. Cleaning of air-cooled condenser
The fin of the air-cooled condenser is easy to attach dust and oil, thus reducing the upwind area and the

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corresponding air volume, so it must be cleaned frequently. Generally the brushing method and blow washing
method are used. Pay attention to protecting the fins and heat exchanger tubes when cleaning. Do not scrape or
knock with hard objects.
Length of connecting pipe
NOTES
- The arrangement of the connecting pipeline shall be carried out according to the site conditions with
reference to the following principles.
- Shorten the length of the connecting pipe as much as possible, preferably within 10 m. Avoid
unnecessary turns and elevations.
- Minimize the height difference between indoor and outdoor units as much as possible.
- Reduce the number of elbows in connecting pipes as much as possible.
- The sum of the equivalent length of the straight pipe and the one-way straight pipe length of the indoor
and outdoor unit is the total length of the indoor and outdoor pipes.
Equivalent length of straight pipe of each local component
Copper pipe diameter (mm) Equivalent length (m)
Copper pipe diameter (mm) 45° Elbow 90° Elbow 180° Elbow
15.88 0.15 0.25 0.5
12.7 0.14 0.25 0.5
9.52 0.10 0.20 0.34
60.06 0.12 0.24
If the connecting pipeline length between indoor and external units is more than 10m, it is necessary to increase
the connecting pipe diameter appropriately in order to reduce the system flow resistance, and the recommended
size of the pipeline is shown in the following table.
Model E04SE E08SE
Pipe length D L D L
10m 9.52 612.7 9.52
20m 12.7 9.52 15.88 9.52
30m 12.7 9.52 15.88 12.7
40m 12.7 9.52 15.88 12.7
50m 12.7 9.52 15.88 12.7
60m 12.7 9.52 15.88 12.7
ote:N
1. D represents pneumatic tube and L represents liquid tube.
2. If the length of the pipe is more than 60m, please consult the manufacturer.
Pipeline layout
When the height of the indoor unit is different from that of the outdoor unit, the pipeline should be arranged
according to the drawing below. The horizontal part of the pneumatic tube should be inclined downward from the
indoor unit, with an inclination of at least 1:200 (should be reduced by 5mm per 1 m). When the outdoor unit is
lower than the indoor unit, the liquid tube is inclined downward from the outdoor unit, and its inclination is the
same as that of the pneumatic tube.