Trane 4MXX8509B10N0 User guide

Installer’s Manual
Split System (R-410A)
Air Handler for
Multi- Zone
Inverter System
9,000 Btu/h to 24,000 Btu/h
Floor and Ceiling Type Models:
4MXX8509B10N0
4MXX8512B10N0
4MXX8518B10N0
4MXX8524B10N0
May 2021 MS-SVN37C-EN

Warnings and Cautions
WARNING
This equipment is to be serviced by professionally trained personnel
ONLY. Under NO circumstances should an unqualified person service it.
This equipment contains refrigerant under PRESSURE and operates at
HIGH VOLTAGE. Improperly installed, adjusted or altered equipment by an
unqualified person poses safety hazards including FIRE, ELECTROCUTION,
or EXPLOSION, which could result in death or serious injury.
Warnings are provided to alert others of the potential hazards that could
result in severe personal injury or death, while cautions are designed
to alert others of the conditions that could result in minor or moderate
injury.
Your personal safety and the proper operation of this machine depend
upon the strict observance of these precautions.
Attention: Warnings and Cautions appear at appropriate sections
throughout this literature. Read these carefully.
WARNING: Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation which, if not
avoided, could result in minor or moderate injury. It may also be used
to alert against unsafe practices.
NOTICE:Indicates a situation that could result in equipment or
property damage.
WARNING
Electrocution and Fire Hazards with Improperly Installed and Grounded
Field Wiring!
Improperly installed and grounded field wiring poses FIRE and
ELECTROCUTION hazards.To avoid these hazards, you MUST follow
requirements for field wiring installation and grounding as described in
the National Electrical Codes (NEC) and your State and/or local electrical
codes. All field wiring MUST be performed by qualified personnel.
Failure to follow these requirements could result in death or serious injury.

Warnings and Cautions
WARNING
R410-A Refrigerant under Higher Pressure than R-22!
The units described in this manual use R410-A refrigerant which operates at 50 to 70%
higher pressures than R-22. Use only R-410A approved service equipment. Refrigerant
cylinders are painted with "pink" color to indicate the type of refrigerant and may contain
a "dip" tube to allow for charging of liquid refrigerant into the system. For specific handling
concerns with R-410A, please contact your local sales office.
Failure to use R-410A approved service equipment could result in standard equipment
exploding under R-410A higher pressure which could result in death or serious injury.
NOTICE
Use appropriate oil with R410A systems. Oil type is found at the bottom of Connection Pipe
Requirements table (included in the outdoor unit installation manual). R-410A systems
utilize POE (Polyolester) or PVE (Polyvinyl Ether) oil. Both oil types absorb moisture readily,
yet, lubrication properties vary. Do not leave the sealed system open to atmosphere except
during service for a short period of time. If the sealed system is left open longer than four
hours, the compressor oil must be changed.These systems utilize strainers placed before
and after the expansion device in the outdoor unit, if debris or moisture is suspected, these
strainers must be changed. Do not break a vacuum with air. Do not leak check the sealed
system with compressed air. Unless instructed by factory service representative, external
refrigeration driers are prohibited.
USE ONLY THE FACTORY RECOMMENDED OIL TYPE!
Important!
Environmental Concerns
Scientific research has shown that certain man-made chemicals can affect the earth's naturally occurring
stratospheric ozone layer when released to the atmosphere. In particular, several of the identified chemicals that
may affect the ozone layer are refrigerants that contain chlorofluorocarbons (CFC's) and those containing hydro-
chlorofluorocarbons (HCFC's). Not all refrigerants containing these compounds have the same potential impact
to the environment.The Company advocates the responsible handling of all refrigerants, including industry
replacements for CFC's such as HCFC's and HFC's.
Responsible Refrigerant Practices
The manufacturer believes that responsible refrigerant practices are important to the environment, our
customers, and the air conditioning industry. All technicians who handle refrigerants must be certified.The
Federal Clean Air Act (Section 608) sets forth the requirements for handling, reclaiming, recovering and recycling
of certain refrigerants and the equipment that is used in these service procedures. In addition, some states or
municipalities may have additional requirements that must also be adhered to for responsible management of
refrigerants. Know the applicable laws and follow them.

Contents
Safety Precautions ..................................................................................................................... 5
Pre-Installation Checklist............................................................................................................ 6
Items Shipped with the Unit and Necessary Tools..................................................................... 7
Unit Main Components............................................................................................................... 8
Refrigerant Piping Precautions .................................................................................................. 9
Installation Location ................................................................................................................. 10
Installing the Indoor Unit .......................................................................................................... 12
Floor Installation ...................................................................................................................... 12
Ceiling Installation .................................................................................................................... 13
Installation of the Condensate Pipe ......................................................................................... 14
Design of the Condensate Pipe ............................................................................................... 15
Refrigerant Piping Requirements............................................................................................. 16
Installing the Refrigerant Piping ............................................................................................... 18
Flaring Processing ................................................................................................................... 18
Bending Pipes .......................................................................................................................... 18
Refrigerant Piping at the Outdoor Unit..................................................................................... 19
Insulating the Refrigerant Piping and Connections.................................................................. 19
Wiring at the Indoor Unit .......................................................................................................... 20
Stranded Wiring Connections .................................................................................................. 21
Electrical Connections.............................................................................................................. 22
Electrical Cable Connection..................................................................................................... 22
Wiring Precautions ................................................................................................................... 23
Grounding Requirements......................................................................................................... 23
Installation of Controllers.......................................................................................................... 23
Post Installation Checklist ....................................................................................................... 24
Test Operation.......................................................................................................................... 24
Wiring Diagrams....................................................................................................................... 25
Indoor Unit Dimensions............................................................................................................ 26
Common Error Codes .............................................................................................................. 27
Troubleshooting........................................................................................................................ 28
General Maintenance............................................................................................................... 29
Check Before Seasonal Use ................................................................................................... 30
Maintenance After Seasonal Use ............................................................................................ 31
After Sales Service................................................................................................................... 31

5
Floor and Ceiling Unit
WARNING This mark indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION
This mark indicates a potentially hazardous situation which, if not avoided,
could result in minor or moderate injury. It may also be used to alert against
unsafe practices.
NOTICE This mark indicates a situation which could result in equipment and/or
property damage.
Safety Precautions
Your personal safety and the proper operation of this equipment depend upon the strict observance of
these precautions.
WARNING
1. Installation should performed by a qualified HVAC professional. Industry Standard Personal
Protective Equipment (PPE) and gear for height related safety should be worn during installation.
Improper personal safety precautions and installation may cause death or serious injury.
2. Install the air conditioner according to the instructions given in this manual. Incomplete installation
work may cause water leakage, electrical shock or fire.
3. Use the supplied or specified installation parts. Use of other parts may cause the unit to come
loose, resulting in water leakage, electrical shock or fire.
4. Install the unit in a location that can support the weight of the unit. An inadequate support
structure or incomplete installation may cause injury or property damage in the event the unit falls
off of the installation location. Refer to the installation specifications for additional requirements.
5. Electrical work should be carried out in accordance with the installation manual and local, state
and National Electric Code (NEC). Insufficient capacity or incomplete electrical work may cause
electrical shock or fire.
6. Use a dedicated power circuit. Never use a power supply shared by another appliance.
7. For wiring, use a cable that is long enough to cover the entire distance without splicing. Do not
use an extension cord. Do not put other loads on the power supply; use a dedicated power circuit.
Failure to do so may cause abnormal heat, electric shock or fire.
8. Use the specified types of wires for electrical connections between the indoor and outdoor units.
Firmly clamp the interconnecting wires so their terminals receive no external stresses. Incomplete
connections or clamping may cause terminal overheating or fire.
9. After joining the interconnecting and supply wiring, shape the cables so that they do not put
undue force on the electrical covers or panels. Install covers over the wires. Incomplete cover
installation may cause terminal overheating, electrical shock, or fire.
10. If any refrigerant leaks out during the installation, ventilate the room. The refrigerant produces a
toxic gas if exposed to flames.
11. When installing or relocating the system, keep the refrigerant circuit free from substances
other than the specified refrigerant (R410-A), such as air. The presence of air or other foreign
substances in the refrigerant circuit can cause an abnormal pressure rise or rupture, which could
result in injury and damage.

6
Floor and Ceiling Unit
12. If a system pump-down is performed, turn off the associated equipment and close service valves
prior to removing the refrigerant piping. Failure to do so will introduce non-condensables in the
system, causing abnormal pressure in the refrigeration cycle which could lead to injury and
damage.
13. Before system start-up, attach the refrigerant piping securely. Failure to do so will introduce non-
condensables into the system when the compressor is running, causing abnormal pressure in the
refrigeration cycle which could lead to injury and damage.
14. Establish a complete ground. Do not ground the unit to a utility pipe, arrester, or telephone
ground. An incomplete ground may cause electrical shock, or fire. A high surge current from
lightning or other sources may cause damage to the air conditioner.
15. If the power supply cable is damaged, it must be replaced by the manufacturer, its service agent
or another qualified professional in order to avoid electrical risk during and after replacement.
Pre-Installation Checklist
1. Unpack and inspect each unit.
2. Check for any damage to the unit.
3. Check the model numbers to ensure a proper match.
4. Check the unit nameplate to ensure the proper electrical requirements will be met.
5. Check the installation locations to ensure the weight of the units can be supported.
6. Check the refrigerant pipe sizes and ensure they have been or will be installed according to the
requirements in this manual.
7. Check the outdoor unit nameplate for electrical power supply and wiring requirements to ensure the
proper wiring has been installed prior to connection.
8. Check the indoor unit for coil leakage. The pressure relief valve on the gas pipe should release
pressurized nitrogen which ensures the unit has not leaked during shipping.
CAUTION
1. Do not install the unit in a place where there is danger of exposure to flammable gas leakage. If
gas leaks and builds up around the unit, it may result in fire.
2. After system installation is completed, make sure no refrigerant leakage is present.
3. This appliance is not intended for use by persons with a lack of experience and knowledge, unless
they have been given adequate supervision or instruction concerning use of the appliance by a
person responsible for their safety.
4. Children should be supervised to ensure that they do not play with the appliance.
NOTICE
1. Establish drain piping according to the instructions in this manual. Inadequate piping may cause
flooding.
2. Tighten the flare nut according to the specified method. If the flare nut is tightened too hard, the
flare nut may crack and cause refrigerant leakage.

7
Floor and Ceiling Unit
Items Shipped with the Floor and Ceiling Unit
After unpacking the unit(s), please refrain from disposing of the packaging materials until items
listed below are located. If any of these are missing, please contact the point of sale to obtain
these items.
Indoor Unit
1. Refrigeration pipe insulation (short piece)
2. Mounting brackets
3. Installation instructions (may be included in outdoor unit)
4. Flare nuts for connecting refrigerant pipes*
5. Mounting fasteners*
6. Wired remote control and 25 feet of connection cable.
*typically packaged in cellophane bubble
Necessary tools
1. Drill
2. Hole Saw
3. Phillips(TM) screwdriver
5. Vacuum pump capable of pulling to 350 microns
6. Manifold gauge set designed for this type of equipment
7. Manifold gauge hoses with 5/16" connections or 1/4" to 5/16" adapters.
8. Tubing benders
9. R-410A Flaring tool
10. Adjustable wrench
11. Nitrogen regulator
12. Nitrogen flow meter
13. Tube cutter
14. Torque wrench set

8
Floor and Ceiling Unit
NOTE: The minimum distance from the floor to the bottom of the indoor unit is a minimum of
11.75" (300mm) for floor installation and 90.5" (2300mm) for ceiling installations.
Unit Main Components
Wireless Controller (Optional)

9
Floor and Ceiling Unit
Refrigerant Piping Precautions
Nitrogen Purging While Brazing
WARNING
Hazard of Explosion and Deadly Gases!
Failure to follow all proper safe refrigerant handling practices could result in death or
serious injury. Never solder, braze or weld on refrigerant pipes or any unit components
that are above atmospheric pressure or where refrigerant may be present. Always
remove refrigerant by following the guidelines established by the EPA Federal Clean
Air Act or other state or local codes as appropriate. After refrigerant removal, use
dry nitrogen to bring system back to atmospheric pressure before opening system
for repairs. Mixtures of refrigerants and air under pressure may become combustible
in the presence of an ignition source leading to an explosion. Excessive heat from
soldering, brazing or welding with refrigerant vapors present can form highly toxic
gases and extremely corrosive acids.
NOTICE
System Component Damage!
Do not remove the seal caps from the refrigerant connections and piping until prepared
to braze refrigerant pipes to the connections. Excessive exposure to atmosphere
(greater than 5 minutes) may allow moisture or other particulates to contaminate the
system, damaging valve seals and causing ice formation in the system components
during operation.
Nitrogen purging while brazing refrigerant pipes
Flow meter
Pressure regulator
Stop valve
Nitrogen
Nitrogen
NOTICE
Avoid Unit Damage!
Never braze pipe connections without performing nitrogen purging. Failure to perform
this procedure will damage the unit, resulting in capacity loss and reduced long-term
reliability.
While brazing refrigerant pipes, continuously purge them with nitrogen gas. Use a
pressure regulator to maintain a flow rate of 1.76 ft³/h (0.05 m³/h) or more.

WARNING
Adequate Support Required!
The wall or ceiling structure must be adequate to support the weight of the unit. Failure to
ensure adequate structural support could result in death, serious injury, and equipment or
property damage.
10
Floor and Ceiling Unit
1. Avoid locating the indoor unit where the return and/or supply air may be obstructed.
2. Select a location where it is easy to route refrigerant lines and communication wiring to the
outdoor unit.
3. Select a location where it is easy to drain the condensate water and connect to the outdoor unit.
4. Keep the indoor unit away from heat sources, vapor and flammable gas.
5. Select a location that meets or exceeds the clearance specifications in this manual.
6. It is not recommended that this unit be installed in or near a kitchen environment. If adequate
distance from the kitchen cannot be achieved, the kitchen must have adequate ventilation to
prevent contamination of the units external and internal working parts.
7. Be sure that the installation of the indoor unit conforms to the installation dimension diagram.
8. Ensure the installation is horizontally level.
9. Be sure to leave enough space to allow access for routine maintenance; clearance between the
bottom of the indoor unit and the floor is a minimum of 11.75" (300mm) for floor installation and
90.5" (2300mm) for ceiling installations.
10. Install in a location where the unit is more than 3 feet away from other electronic appliances that
could cause interference such as television, audio devices, etc.
11. Select a location where air filters can be easily removed and replaced.
12. When installing the threaded rod or bolt, check if the installation location can withstand 4 times the
weight of the unit. If not, reinforce before installation.
NOTICE
Installing the unit in one of the following locations could result in unit malfunction:
1. Places where oil (machine oil) is used.
2. Seacoast places with high levels of salt in the air.
3. Places with high levels of sulphur gas such as areas with hot springs.
4. Places where high-frequency waves are generated by radio equipment, welders and medical
equipment.
5. Other unusual places where unit operation may be altered.
6. Places where minimum clearances cannot be met.
Installation Location
Indoor Unit
For instructions on installing the outdoor unit please refer to the installation guide supplied
with the selected outdoor unit for your application.

Installing the Indoor Unit
11
Floor and Ceiling Unit
Mounting Location
1. Confirm the mounting location with the customer. Keep in mind the basic installation
guidelines on page 10.
2. The drilling of holes in the ceiling must be done by the installing technician.
3. Ensure the hanging point is strong enough to support 4 times the weight of the unit.
4. The weight of the unit should be shared equally by the expansion bolts.
>300 mm
>1000 mm
>300 mm
>300 mm
>1500 mm
>300 mm
>300 mm
>300 mm >1500 mm
>150 mm
>2300 mm
POWER
RUN
TIMER
>11.75 inch >11.75 inch
>11.75 inch
>11.75 inch >59 inch
>39 inch
>6 inch
>11.75 inch
>90 inch
>59 inch
>11.75 inch
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures recommended in this section of the
manual could result in exposure to electrical, mechanical or other potential safety
hazards. Always refer to the safety warnings provided throughout this manual
concerning these procedures. Disconnect all electrical power including remote
disconnect and discharge all energy storing devices such as capacitors before
servicing. Follow proper lockout/tag out procedures to ensure the power can not be
inadvertently energized. When necessary to work with live electrical components, have
a qualified licensed electrician or other individual who has been trained in handling live
electrical components perform these tasks. Failure to follow all of the recommended
safety warnings provided, could result in death or serious injury.
Clearance Requirements

Installing the Indoor Unit
Prepare the Indoor Unit
1. Determine the mounting location on the ceiling or wall by using the installation template. Mark
the bolt locations and remove the installation template.
2. Remove the return air grille, side panels and the hanger bracket from the indoor unit. Open the
air inlet grille and the screw cover and remove the screws.
3. Loosen the side panel fixing screw and remove the side panels.
4. Loosen the two hanger bracket setting bolts (M8) on each side by about 0.4 inches (10mm).
5. Remove the two hangber bracket fixing bolts (M6) on the rear side. Detach the hanger bracket
by pulling it backward.
6. Release the claws in the 3 places indicated.
7. Release the center hook and remove the front panel.
8. Release the claws in the places indicated on the electric box cover and remove the box.
Installing the Unit
1. Once the mounting location has been marked using the installation template, drill the mounting
holes. The unit must be level to ensure proper condensate drainage.
2. Insert the anchor bolts into the drilled holes, and drive the pins completely into the anchor bolts
with a hammer.
3. Fix the hanger bracket to the anchor bolts.
4. Put the hanger bolt into the clasp of the indoor unit and tighten the screws on the hanger to
prevent the indoor unit from moving.
5. Reinstall and tighten the right and left side panels.
Floor Installation
12
Floor and Ceiling Unit

Ceiling Installation
1. Set the suspension bolts and adjust the distance from the unit to the ceiling before hanging the
unit.
2. Fix the hanger bracket to the suspension bolt. Make sure that the extended suspension bolt is
firmly seated into the ceiling support.
3. Lift the unit and slide it forward until it is in place in the hanger brackets.
4. Tighten both hanger bracket setting bolts (M8).
5. Tighten both hanger bracket fixing bolts (M6) to prevent displacement of the indoor unit.
6. Adjust the height so the rear side of the drain plpe is at a slight decline for improved
condensate drainage.
7. Reinstall and tighten the right and left side panels.
NOTE: Only the specified accessories and parts for installation work should be used.
WARNING
Adequate Support Required!
The wall/ceiling structure must be adequate to support 4 times the weight of the unit. Failure to
ensure adequate structural support could result in the unit falling from its location which could
result in death, serious injury, or equipment or property-only damage.
13
Floor and Ceiling Unit

Installation of the Condensate Pipe
Celling
1.57 inch
t
Celling slab
INW
setting bolt(M8)
fixing bolt(M6)
40 mm
Levelling the Unit
1. Ensure that the unit is level side to side for floor applications.
2. For ceiling applications the unit must be level side to side. Adjust the height of the unit fore
and aft to make the drain pipe slant slightly downward so condensate water will flow properly.
CAUTION
Seal properly and verify there is no water leakage from the joint of the condensate pipe.
Failure to do so may result in equipment and/or property damage.
14
Floor and Ceiling Unit

Design of the Condensate Pipe
1. Either the right rear or right side of the unit is suitable for affixing the condensate pipe.
2. The drain pipe should maintain a downward sloping angle of 5~10° to avoid water
accumulation or improper drainage which could lead to equipment and/or property damage.
3. When connecting the drain pipe to the unit, avoid excessive force on the connection. The pipe
should be as close to the unit as possible.
4. Construct the drain pipe from material approved by the Authority Having Jurisdiction (AHJ).
Make a liquid tight connection between the drain hose and main drain with a clamp rather than
adhesive.
5. The diameter of the drain pipe should be greater than or equal to that of the refrigerant pipe.
(PVC pipe, outer diameter : 1 inch (25mm), wall thickness ≥0.05 inches (1.5mm).
6. The drain pipe should be as short as possible and with at least a 0.6 degree slope to avoid
forming air pockets.
Installation of the Condensate Pipe
1. Use the supplied drain hose and clamp.
2. Insert the drain pipe into the opposite end of the drain hose and clamp securely (this clamp
supplied by installer). Do not use adhesive at this joint.
3. Insert the drain hose completely into the drain socket. Tighten the clamp to ensure a good
seal.
4. Wrap the attached foam wrap over the clamp and drain hose to insulate.
5. Confirm that adequate drainage is achieved after the condensate hose has been attached.
Test by pouring water into the drain pan from the air outlet.
(When drain hose is connected)
Decline the drain hose
Not to be lifted
No foldings
Not to be
soaking in water
Clamp (accessory)
Foam wrap (gray) Drain Hose
Foam wrap (accessory)
Clamp
(accessory)
Max. 4mm
0.16 inch
Watering can
Air outlet
15
Floor and Ceiling Unit

16
Floor and Ceiling Unit
Refrigerant Piping Requirements
Note: Until the outdoor unit is set and ready to connect refrigeration pipes, do not remove the
caps from the indoor unit.
NOTICE
1. Connect each pipe to its port on the indoor unit correctly. If the centering is improper, the
flare nut cannot be tightened smoothly. If the flare nut is forced to turn, the threads will be
damaged. Refer to the flaring process guidelines in this manual for additional information.
2. Do not remove the tube caps nut until the connection pipe is made ready to prevent dust and
impurities from entering the system.
1. When connecting refrigerant pipe to the unit or removing it from the unit, please use both a
back-up wrench and the torque wrench. See illustration on page 17.
2. When connecting, place the equipment specified oil type on the backside of the copper
tube flare prior to tightening. Do not place oil on the flare face, as this will promote system
contamination, tighten it by hand and then tighten it with the spanner or adjustable wrench.
3. Refer to the torque reference table within this document before tightening to determine the
appropriate torque (over-tightening will damage the nut and lead to leakage).
4. Use dry Nitrogen to pressurize the piping circuit with 150 PSIG and allow it to hold while
performing other installation processes. It is recommended to apply a soap bubble solution and
observe the connection.
5. Evacuate each individual refrigeration circuit to 350 microns or below, and close off the valve to
the vacuum pump. If the pressure rises above 500 microns within one minute, but not above
1500 microns within 5 minutes, moisture is present. If the pressure continues to rise above
1500 microns, a leak exists in the circuit being tested.
a) If moisture is present, use triple evacuation process to eliminate the moisture.
b) If a leak is present, leak check all joints and piping.
Evacuation is not completed until the micron gauge does not rise above 500 microns within
one minute after achieving 350 micron pressure vacuum.
6. After evacuation is complete, additional charge can be added.
a) If no additional charge is required, break the vacuum with refrigerant, then remove the
gauge connectors.
b) slightly open the liquid valve at the OD unit, allow system to equalize, then fully open
the liquid valve and then open the vapor service valve.
7. After leak checking is complete, apply thermal insulation around the flare connections and
all exposed refrigeration pipes Refer to the guidelines for insulating refrigerant piping and
connections in this manual for additional information.
a) Seal the insulation
b) Inspect the insulation to assure no breakages are present.
NOTE: Use Dry Nitrogen for leak checking purposes. Never use oxygen, compressed air, or any
flammable gas for leak checking purposes.

CAUTION
1. During the connection of the indoor unit and the refrigerant pipe, never pull any parts of
the indoor unit forcefully: otherwise the refrigerant pipes or other pipes may crack, which
would then result in leakage.
2. The refrigerant piping should be supported by brackets. Unsupported piping will put stress
on the indoor unit and could lead to leaking or breakage.
Install refrigeration lines matching the indoor unit refrigeration tubing diameters. Tube adapters
are supplied with the outdoor unit in order to complete the connection at the outdoor unit.
17
Floor and Ceiling Unit
Back-up Wrench
Pipe Diameter in. (mm) Tightening Torque
1/4 (6.35) 11.25-14.75 ft-lbf / 15 ~ 20 N•m
3/8 (9.52) 22.25-29.50 ft-lbf / 30 ~ 40 N•m
1/2 (12.7) 33.25-40.50 ft-lbf / 45 ~ 55 N•m
5/8 (15.9) 44.25-47.75 ft-lbf / 60 ~ 65 N•m

Bending Pipes
Installing the Refrigerant Piping
Flaring Process
1. Hold the pipe downward to prevent cuttings from entering the pipe.
2. Using an appropriate tube cutter and deburring tool, cut and deburr the refrigerant pipe.
3. Remove the flare nuts at the stop valve of the outdoor unit and inside the accessory bag of
the indoor unit, put them onto the refrigerant pipe as shown below then flare the refrigerant
pipe with a flaring tool.
4. When flaring copper tubing, only use flaring tools that utilize an orbiting mandrel and
clutched handle. These are typically referenced as R410A flaring tools. By using this type of
flaring tool, the copper tubing is rolled while being pressed, thereby reducing the probability
of copper flare cracking.
5. Check if the flare part is spread evenly and there are no cracks.
1. Use a refrigerant pipe bending tool to shape refrigerant piping; smaller diameter piping may
allow for light hand bending, providing minimum diameter of 6 inches.
2. Do not bend the pipes in an angle more than 90°.
3. When pipes are repeatedly bent or stretched, the material will be prone to damage, which may
lead to refrigerant leaks. Do not bend or stretch the pipes more than three times.
4. Do not bend the pipe while insulated. First, cut the insulation with a sharp cutting tool and
expose it to the appropriate bend radius, as shown below. After bending the pipe, replace the
insulation and seal it with pipe wrap tape.
NOTICE
1. To prevent distortion and breaking of the pipe, bend the pipe with a radius of curvature of 6
in. (150 mm) or more. Use a tubing bender when forming the copper tubing into a bend.
2. If the pipe is bent repeatedly at the same place, it will break.
18
Floor and Ceiling Unit

NOTICE
1. To prevent distortion and breaking of the pipe, bend the pipe with a radius of curvature of 6
in. (150 mm) or more. Use a tubing bender when forming the copper tubing into a bend.
2. If the pipe is bent repeatedly at the same place, it will break.
CAUTION
Connect the gas pipe after connecting the liquid pipe completely.
Refrigerant Piping at the Outdoor Unit
Tighten the flare nut of the connection pipe at the outdoor unit valve connector. Follow the flare
nut guidelines in this manual.
Insulating the Refrigerant Piping and Connections
1. The refrigerant pipes should be insulated and wrapped with appropriate
insulating material and wrapping tape. This will prevent condensation, water
leakage and damage to the insulating material.
2. The connections at the indoor unit should be wrapped with insulating material.
No gap is allowed on the joint of the indoor unit, as shown below.
19
Floor and Ceiling Unit

WARNING
1. If the power cord or the communication line are damaged, they must be replaced with the
required replacement part.
2. Prior to wiring, please check the electrical information marked on the nameplate and carry
out the wiring following the wiring diagram.
3. The unit must be grounded to prevent electrical shock hazards.
4. All wiring should be done strictly in accordance with the wiring diagram. Improper wiring
would cause abnormal operation or damage to the unit.
5. Do not let the electrical wires touch the refrigerant pipe, the compressor, the fan or other
moving parts.
6. Do not modify the wiring inside the indoor unit, otherwise the manufacturer will not assume
any responsibility for damage or abnormal operation of the unit.
Wiring at the Indoor Unit
1. Open and remove the front panel of the unit.
2. Remove the cover of the electrical box of the indoor unit.
3. Route the power connection cord from the back of the indoor unit and pull it toward the front
through the wiring hole.
4. Insert the power cord through the rubber ring.
5. Pull the 4-wire cable through the wiring hole of the chassis upward, then connect the power
line and the communication line from the outdoor unit to the corresponding terminals N(1), 2,
3 and grounding terminal of the indoor unit. Wiring shall be done properly as per the wiring
diagram. (NOTE: Be sure the wiring terminals A/B/C/D/E and piping ports A/B/C/D/E of the
indoor unit match with that of the outdoor unit respectively).
6. Replace the cover of the electrical box of the indoor unit.
7. Reinstall and secure the front panel of the unit.
8. Do not allow the wiring to come in contact with any of the refrigerant lines.
WARNING
Disconnect all electrical power and discharge all energy storing devices such as capacitors to
the outdoor unit(s) prior to wiring the indoor unit(s) to avoid risk of death, injury, or damage to
equipment.
20
Floor and Ceiling Unit