Trane MWC518 User manual

Indoor Unit
Installation & Operation Manual
Advanced Multi-split System
Cassette Indoor Unit
MWC518/524
R410A
200061360200
April 2012 AMS-SVX02A-EN

2 AMS-SVX02A-EN
Table of Contents
User Notice čččččččččččččččččččččččččččččč 3
Attention ččččččččččččččččččččččččččččččč 4
Unit Model čččččččččččččččččččččččččččččč 6
Unit Components and Names ččččččččččččččččččččč 7
Unit Installation Site Selection and Attentions čččččččččččččč 8
Unit Installation čččččččččččččččččččččččččččč 10
Installation Diagram ččččččččččččččččččččččččččč10
Panel Installationččččččččččččččččččččččččččččč14
Electrical Control Wiring čččččččččččččččččččččččč 19
Electrical Wiring ččččččččččččččččččččččččččččč19
Electrical Parameters ččččččččččččččččččččččččččč21
Electrical Wiring Diagramčččččččččččččččččččččččč 22
DIP Setting čččččččččččččččččččččččččččččč 23
Wired Controller Instruction čččččččččččččččččččččč 24
Fault Analysis ččččččččččččččččččččččččččččč 26
Maintenance ččččččččččččččččččččččččččččč 27

AMS-SVX02A-EN 3
User Notice
Please review this manual carefully before installation
It is our pleasure that you select air conditioning unit from Trane. Please review this manual
carefully before installation and keep it safe for proper operation.
User notice
During operation, the total capacity of the indoor units operating at the same time shall
•
not exceed the outdoor unit capacity. Otherwise, it will lead to inadequate indoor unit
cooling (heating) capacity.
All indoor units are powered in the same way. User should cut off the main power supply
•
before cleaning.
User should keep the unit powered on. If user do not use the unit for a long term, please
•
cut off power supply and switch on the main power switch for 24 hours before operation.
When the indoor unit receives shutdown signal, the fan would keep running for 20-70s to
•
use residual cool or heat from the heat exchanger and ready for the next operation.
If operating modes of the indoor unit and outdoor unit are not in accordance, the indoor
•
unit fault indicator flashes after 5s and the indoor unit stops. In that case, just mode
conversion can eliminate the conflict. Cooling mode is in accordance with dry or fan mode,
while non modes are in accordance with heating mode.
Communication wires can not mix with power wires, they should be arranged respectively.
•
The minimum distance is 20cm at least, or may cause unreliable communication.

4 AMS-SVX02A-EN
Attention
Please read the information within this manual and carry out the operation in accordance1.
with instructions.
Please pay close attention to the following symbols:2.
Warning
A symbol indicating improper operation may cause personnel death or severe injury.
Attention
A symbol indicating improper operation may cause personnel injury or property
damage.
Warning
Please contact authorized service centre to install the unit. Improper installation may cause•
accidents, such as water leakage, electric shock and fire etc.
Please select a location can withstand the full weight of machine. Otherwise the machine•
may fall and cause personnel injury or death.
Install the drainage pipe in accordance with this manual to ensure smooth water flow.•
Besides, you should also take measures to prevent condensation. Improper installation will
cause water leakage and wet household things.
Do not use or store inflammable, explosive or dangerous goods beside the air conditioning.•
When fault happens (such as comes out burning smell etc.), please cut off the unit main•
power instantly.
There should be plenty of fresh air inside the room, avoiding oxygen deficit.•
Do not insert fingers or others into air outlet or air inlet grid•
Please check installation stand if damaged after long term use regularly.•
Do not modify the unit. Please contact your dealer or professionals for installation or•
moving.

AMS-SVX02A-EN 5
Attention
Please verify the power supply meets requirements in the nameplate and check safety•
before installation.
Before operation, please check wires, drainage pipes and pipes connection avoiding•
accidents, such as water and refrigerant leakage, electric shock and fire etc.
Main power supply must be earthed reliably for effective air conditioning unit earth,•
avoiding electric shock. The earth wire should not connect with gas pipe, water pipe,
lightning rod or phone line.
Switch off the unit after 5 minutes running at least, otherwise it may reduce the unit service•
life.
Children operating air conditioning unit is prohibited.•
Do not touch air conditioning unit with wet hands.•
When clean the air conditioning or replace the air strainer, switch off main power supply•
first.
Cut off main power supply of the air conditioning unit, which is unused for a long term.•
Air conditioning unit can not be exposed to water or moist environment directly, which can•
cause corrosion.
Connect the power supply for leakage test after installation.•
Attention

Model M W C 5 1 8 M M N B A
1234567891011
Additional option N A A
12 13 14
Service code M W C 5 1 8 M M N B A N A A
1234567891011121314
Digit 1 M =Trane mini split unit
Digit 2 W = Heat pump
C = Cooling only
Digit 3 C = Cassette unit
Digit 4 5 =Threaded connection
Digit 5, 6 Nominal cooling capacity
18
24
Digit 7 Design serial no.
M = Free split indoor unit inverter system (with electronic expansion valve)
Digit 8 Power supply type
M=220~240V/50Hz/1PH
Digit 9 Electric heater
N= Non-electric heater
Digit 10 Controller
A = Wired controller
B = Wired + card remote controller (standard)
Digit 11 Design change
A = Change of initial design
Digit 12 Optional accessories
N = None
Digit 13 Configuration change
A = First
Digit 14 Others
A = Sale in domestic market
B = Export
6 AMS-SVX02A-EN
Unit Model
Model (Cassette indoor unit)

Unit Components and Names
Figure 1.
Drainage device (built-in type)
Discharge condensate water from
the indoor unit in cooling mode
Drainage pipe
Air deflector
(In the air outlet)
Connecting pipe
Air outlet
Air strainer and purifier
(In the air inlet grille)
Air inlet grille
AMS-SVX02A-EN 7

8 AMS-SVX02A-EN
Unit Installation Site Selection and Attentions
Select Unit installation site
Unit installation must comply with the local and national safe codes.
Unit installation quality affects air conditioning operation directly. User can not install the
unit by himself. Please contact your dealer and invite professionals to carry out installation
and commissioning of the unit in accordance with this manual.
Connect the power supply after all installation processes are completed.
Select Indoor unit installation site
Avoid direct sunlight.•
Ensure that the top suspension rod, ceiling and building structure etc. are strong enough to•
support the unit.
Drainage pipe is easy to connect from outside.•
Inlet and outlet air flow are smooth.•
Indoor and outdoor connecting pipe are easy to extend to the outdoor.•
There are not inflammable and explosive articles or gas in the surroundings.•
The damp environment with corrosive gas, heavy dust, salt mist and oil smoke can not be•
the installation site.
Attention
Following locations may cause the air conditioning unit fault. If you have to select this kind of
environment, please contactTrane service centre for help.
ƗFull of engine oil; ƘSeaside saline area; ƙSulphuric gas (sulphuric hot spring);
ƚHigh frequency facility (radio equipment, electric welder and medical equipment);
ƛSpecial environment.
Electrical wiring layout
Installation must comply with national wiring regulations.•
Please select rated voltage and special air conditioning circuit.•
Do not pull the power wires.•
Please invite professionals to install in accordance with local laws and regulations and this•
manual.
Diameter of power cord should be enough. Only specified flexible cord can replace•
damaged power cord and wires.
Please invite professionals to install. Connect wires to special building earthing device•
reliably. There should be adequate leakage protection and air switches for fixed wires.
The air switch with magnetic and thermal trip function is for short circuit and overload
protection.

AMS-SVX02A-EN 9
Earthing
Air conditioning unit is Class I electric appliance and should be earthed reliably.•
Yellow-green color line is earth line only for earthing and can not be broken. Self-tapping•
screw is not used for fix, or it may cause electric shock.
Earth resistance complies with national standards GB17790.•
User is responsible for providing reliable earthing terminal.•
Pease do not connect earth wire to followings:
ƗWater pipe; ƘGas pipe; ƙDischarge pipe; ƚOthers professionals think unreliable.
Installation accessories
See respective packing list in the packing box.
Unit Installation Site Selection and Attentions

10 AMS-SVX02A-EN
Unit Installation
Installation Diagram
Over 20mm
Over 1,500mm Air outlet Air outlet Air outlet
Ground
Over 1,500mm
Over 1,800mm
Figure 2.
Verify indoor unit installation site
Ensure no barriers in indoor unit air inlet and outlet for good ventilation.1.
Ensure installation complying with the diagram.2.
Select a low running noise and less vibration location which can support 4 times of indoor3.
unit weight
Ensure horizontal installation location.4.
Select a location, which is easy to discharge condensate water and connect to outdoor unit.5.
Ensure enough space for repair and maintenance.6. The distance between indoor unit and
ground is 1,800mm at least.
Check hoist screw installation site if support 4 times of the unit weight. Strengthening it7.
before installation if necessary (see installation paperboard for points to fix).
Attention
There are pretty much oil smoke and powder in places such as the dining hall and kitchen.
Centrifugal fan, heat exchanger and water pump in places above are easily polluted and affect
heat exchange ability, water dropping and water pump function. In that case, please take
following measures:
Ensure the range hood has good function, avoiding oil smoke entering the air conditioning.1.
Keep air conditioning away from the kitchen.2.

AMS-SVX02A-EN 11
Unit Installation
Air conditioning
Gas appliance
Keep enough distance
Range hood with
good function
Figure 3.
Important
Only air conditioning unit installed by professionals in accordance with this manual can•
provide good function.
Please contact local Trane authorized service center before installation. When the unit•
installed by non-authorized service center is failure, we can not resolve it in time for
business relations.
Ceiling hatch dimension and hoist screw (M10) location
A
Refrigerant pipe
Hoist screw (X4)
950 (Decoration panel)
950 (Decoration panel)
890 (Ceiling hatch)
840 (Indoor unit)
680 (Distance between hoist screws)
890* (Ceiling hatch)
840 (Indoor unit)
780 (Distance between hoist screws)
Figure 4.

12 AMS-SVX02A-EN
Unit Installation
Only professional can drill holes in the ceiling•
(160)
Ceiling
Main stand
Over 20
Description: Dimension of ceiling hatches with * can be 910mm, but the overlapping section
between the ceiling and decoration panel should be over 20mm.
Hoisting Main Unit of Air Conditioning
Preliminarily install the indoor unit.1.
Connect the hanger bracket with hoist screws. Put nuts and washers in both ends of the•
hanger bracket to fix it. Guide plate can prevent the washer falling.
Installation paperboard2.
Review installation paperboard for ceiling hatch dimension•
There is a mark in the installation paperboard indicating ceiling hatch centre.•
Fix the installation paperboard at the unit with 3 screws and outlet pipe drainage tank•
corner is also fixed with screws.
Adjust the unit installation site (as shown in fig.4).3.
Check the unit if horizontal.4.
The indoor unit is equipped with drainage pump and float switch. Check 4 corners in turn•
with level (if the unit inclines towards the reverse condensate water flowing direction, the
float switch may be faulty and cause water dropping).
Remove the washer guide plate and tighten the nut above.5.
Remove the installation paperboard.6.

AMS-SVX02A-EN 13
Unit Installation
[Fix the hanger bracket] [Fix the washer]
[Fix the installation paperboard]
Insert
Washer guide plate (accessory)
Nut (provided on-site)
Hanger bracket
Tighten (double nut)
Washer
(accessory)
Fix the screw at the corner of outlet pipe at
the drainage tank corner
Center of the
ceiling hatch Installation paperboard
Screw (accessory)
Screw (accessory)
PE pipe
Level
Figure 5.
Warning
Please tighten the nuts and bolts, preventing the air conditioning falling.

14 AMS-SVX02A-EN
Unit Installation
Panel Installation
As shown in Fig.6, place the air deflector motor facing indoor unit pipe mouth.1.
Panel installation2.
ƗInstall the panel on the indoor unit temporarily. Put the buckle at the hook (2 positions) in
the opposite air deflector motor side.
ƘPut the residual 2 buckles at the main hook temporarily (air deflector motor wires can not
be involved in sealing materials).
ƙTorque the 4 hexagonal screws below the hook to 15mm (the panel will be lifted later).
ƚAs shown in fig.ƚ, adjust the panel in arrow direction for good connection between
regulation plate and the ceiling.
ƛTighten screws till the thickness of sealing materials between panel and indoor unit is
5-8mm.
ƛ
ƚ
ƙ
Ƙ
Ƙ
Ɨ
Hook
Buckle
Pipe mouth
Air deflector motor
Indoor unit
Ceiling
Air outlet Decoration panel
Sealing materials
5-8mm
Figure 6.

AMS-SVX02A-EN 15
Unit Installation
Attentions
Improper screw tightness may cause fault as shown in fig. 7.1.
Air leakage
Ceiling air leakage
Water drop condensed and fall
Figure 7.
If there is still a seam between ceiling and decoration panel after tightening screws, please2.
adjust the indoor unit height again (as shown in fig. 8).
No seams
Without affecting the indoor unit lifting
and drainage pipe are prerequisites for
adjusting the height through holes at
the panel corner.
Figure 8.
řEnsure no clearances between the unit and panel after installation.
Decoration panel wiring (see fig. 9).3.
Connect two joints of air deflector motor at the panel.•
Main Panel
Main Panel
Figure 9.

16 AMS-SVX02A-EN
Unit Installation
Refrigerant pipe connection
As shown in fig. 10, use wrench and torque wrench simultaneously for removing or•
installing pipes.
Apply refrigerating engine oil on the tapered nut inside and outside, and then tighten it•
after 3-4 turns manually.
Tightening torque see table. 1 (over tighten may damage the nut and cause leakage)•
As shown in fig. 10, check the connecting pipe for air leakage and take heat insulation•
measures.
Wrap joints of air pipe and air collector pipe insulating sleeve with the sponge.•
Apply refrigerating
engine oil
Torque wrench
Wrench
Pipe joint
Liquid inlet pipe
Air collector pipe
Cable tie (x4)
Air collector pipe
insulating sleeve (accessory)
(For air pipe)
Liquid inlet pipe
insulating sleeve (accessory)
(For liquid pipe)
Tapered nut
Sponge (accessory)
(Wrap pipe joints with seal)
Figure 10.
Torque for tighten the nutTable 1.
Diameter Wall thickness
(mm) Tightening torque
Ø6.35mm ≥ 0.5 15-30 (N•m)
Ø9.52mm ≥ 0.71 30-40 (N•m)
Ø12.7mm ≥ 1 45-50 (N•m)
Ø15.9mm ≥ 1 60-65 (N•m)
Ø19.05mm ≥ 1 70-75 (N•m)

AMS-SVX02A-EN 17
Unit Installation
Drainage pipe
Installation1.
Diameter of the drainage pipe should be larger than or equal to the connecting pipe•
diameter (PE pipe outer diameter is 25mm and wall thickness is larger than or equal to
1.5mm).
Drainage pipe should be as short as possible and the gradient shall be 1/100 at least to•
prevent air pocket formation.
If it is impossible to realize adequate gradient of drainage hose, a drainage lift pipe shall be•
installed.
To allow the drainage hose not to bend, a distance of 1~1.5m at least shall be maintained•
between hangers.
×(Wrong)
1-1.5m
○(Correct) gradient above 1/100
Figure 11.
Use the supplied drainage hose and clamp.•
Insert the drainage hose in the drainage socket and secure the clamp.
For heat insulation, wrap the clamp with a large piece of sponge.•
Perform heat insulation for the drainage hose in the room.•
Clamp Clamp
(accessory)
Sponge (gray) Drainage hose Less than 4mm
Figure 12.
Precautions for Drainage Lift Pipe
The drainage lift pipe shall be installed at a height less than 280 mm.•
The lift pipe shall be vertical to the unit and its distance to the unit shall not exceed 300•
mm.

18 AMS-SVX02A-EN
Unit Installation
Less than
500mm
220mm
1-1.5m
Roof
Less than 300mm
Ceiling Clamp (accessory)
Drainage hose
(accessory)
Drainage lift pipe
Hanger bracket
Less than 280mm
Figure 13.
Explanation
The inclination of supplied drainage hose shall not exceed 75mm, allowing the drainage•
socket not have to bear additional external force.
If several drainage pipes converge, then perform the installation by following the•
procedures below.
Drainage hose
(accessory)
Over 100mm
T-joint Confluent
drainage pipe
Less than 75mm
Less than 500mm
Selected confluent drainage pipe to be sized to operating capacity to theFigure 14.
unit
Check if the water drains smoothly at the end of installation.2.
Slowly inject 600cc water via air outlet or inspection hole to check the drainage.•
Check the drainage in the cooling condition after installation of electrical circuits.•
[Water injection method] Drainage pipe
Over 100mm
<Inject water at the air outlet end>
<Inject water via the
inspection hole>
Plastic spray can
(its tube shall be about 100mm in length)
Inspection hole cover
Inspection hole
Service drainage outlet
(with rubber plug)
(drain off the water in the gutter via this outlet)
Figure 15.

AMS-SVX02A-EN 19
Electrical Control Wiring
Electrical Wiring
Attention All indoor units must be powered by the same
power supply system.
See attachedĐWiring diagramđfor electrical working.•
Only professionals can carry out all installations.•
Please take earthing measures.•
Unit Connecting and Communication Cable
Connect the wiring (communication):•
ƗOpen the electrical appliance box cover (1) insert the wiring (communication) into rubber
bushing A and press them with a cable clip respectively.
ƘWiring according to indoor circuit diagram.
Fix the cable clip after completed.•
Wrap the wire with small sponge (it is necessary for prevent condensation formation).•
Press it with the cable clip after completed and then install the electrical appliance box•
cover (1) and (2).
Connect 3-core rubber wire with corresponding terminal of the 3-pin terminal board.•
N
L
Single phase
Cable clip
Cable clip
Rubber ring through the wire
Rubber ring
through the wire
Hereby, seal it to prevent
water entering.
Electrical appliance
box cover (1)
Electrical appliance
box cover (2)
(to Power)
(3-pin terminal board)
3 core rubber wire
Figure 16.

20 AMS-SVX02A-EN
Power and Communication Wiring of Wired Controller
CN1
CN17
Main board
Special 2-core
shielded wire
Bottom of wire
controller display board
Power and communication wiring of wired controllerFigure 17.
It is power and communication wiring diagram of wired controller above. Insert 2-core shielded
wire from main board CN17 into terminal CN1 of display board. Verify the power has been cut
off before installation and wiring. Check connection after completed to ensure good connection
and non short circuit.
Warning
Only special flexible cord can replace damaged power cord or signal wire.1.
Please review all parts voltage marked on the nameplate before wiring. See the wiring2.
diagram for wiring.
Air conditioning unit should use special power wires with leakage and air switches for3.
overloading
Air conditioning unit must be earthed to prevent damage caused by failure of insulation.4.
All wirings must use crimp terminal or single wire. Multi-stranded wire connects with the5.
terminal board directly may cause spark.
All wiring should comply with the wiring diagram. Improper wiring may lead to irregular6.
working or damage.
The cable can not touch movable parts, such as the connecting pipelines, compressor or7.
fan etc.
Do not change internal wiring freely. Manufacturer is not responsible for related damage or8.
irregular running.
Connecting of Indoor and Outdoor Unit Communication Wires
Open the electrical appliance box cover.1.
Wiring (communication) passes through the rubber ring.2.
Insert wiring (communication) into 3-pin socket CN15 and CN16 of the indoor unit circuit3.
board.
Tie and fix the wiring (communication) with cable tie.4.
Electrical Control Wiring