Trane MXW Owner's manual

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Installation, Operation,
Maintenance
MXW / TXK
R410A Split System - Wall Unit
Heat Pump - Up To 16.9 SEER
9,000 - 18,000 Btu/Hr
MXWA09 / TXKA09
MXWA12 / TXKA12
MXWA18 / TXKA18

© 2007 American Standard Inc.

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Operation and Maintenance
Safety Precautions ........................................................................ 4
Specifications and Technical Data .................................................8
Operating Instructions .................................................................10
System Description ...................................................................... 11
Remote Control Description ..........................................................12
Care and Maintenance ................................................................ 15
Troubleshooting ........................................................................... 17
Installation
Installation Recommendations .................................................... 20
Installation Location..................................................................... 22
Installation - Indoor Unit .............................................................. 23
Installation - Outdoor Unit ............................................................ 26
Testing and Operation Verification ...............................................29
C o n t e n t

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Safety Precautions
WARNINGS
All phases of this installation must comply with National, State and Local codes.
This information is intended for use by
individuals possessing adequate backgrounds
of electrical and mechanical experience. Any
attempt to repair a central air conditioning
product may result in personal injury or
property damage. The manufacturer or seller
cannot be responsible for the interpretation of
this information, nor can it assume any liability
in connection with its use.
NOTICE:
Trane has always recommended installing
Trane approved matched indoor and outdoor
systems.
The benefits of installing approved matched
systems are maximum efficiency, optimum
performance and best overall system reliability.
These units use R410A refrigerant which
operates at 50 to 70% higher pressures than
R-22. Use only R-410A approved service
equipment. Refrigerant cylinders are painted
a “rose” color to indicate the type of
refrigerant and may contain a “dip” tube to
allow for charging of liquid refrigerant into
the system. All R-410A systems use a POE
oil that readily absorbs moisture from the
atmosphere. To limit this “hygroscopic”
action, the system should remain sealed
whenver possible. If a system has been open
to the atmosphere for more than 4 hours, the
compressor oil must be replaced. Never
break a vacuum with air and always change
the driers when opening the system for
component replacement. For specific
handling concerns with R-410A and POE oil,
reference Retrofit Bulletin TRN-APG02-EN.
UNIT CONTAINS R-410A REFRIGERANT!
R-410A OPERATING PRESSURE EXCEEDS
THE LIMIT OF R-22. PROPER SERVICE
EQUIPMENT IS REQUIRED. FAILURE TO USE
PROPER SERVICE TOOLS MAY RESULT IN
EQUIPMENTDAMAGEOR PERSONALINJURY.
SERVICE
USE ONLY R-410A REFRIGERANTAND
APPROVED POE COMPRESSOR OIL.

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Safety Precautions

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Safety Precautions

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Safety Precautions

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Specifications and Technical Data

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Specifications and Technical Data

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Operating Instructions
Cooling Mode = Principle and Special Functions
Principle of Operation
Theairconditionerabsorbsheatfromtheair and discharges it to the oudoors, thereby cooling the indoor ambienttempera-
ture.Coolingcapacity decreases with the increase oftheoutdoortemperature.
Special Anti-freeze Function
Iftheair conditioner is operating underlow-temperatureconditionsin the cooling mode, frostwillappearonthe surface of
theindoorheatexchanger.Asthetemperatureoftheheatexchangerdecreases to 0°F or less, the microcomputerinthe
indoorunitwill stop the compressor operation inordertoprotecttheunit.
Principle of Operation
Theairconditionerabsorbs heat from the outdoor air bringing itindoorstoheatthespace,thereby increasing the indoor
ambienttemperature.Heatingcapacitydecreaseswiththereductionoftheoutdoortemperature.
Withthistypeofhotaircirculation system, the indoor temperature increases rapidly.
Usethisairconditionerwithotherheating equipment if the outdoortemperatureesextremelylow.
Special Defrost Function
Whentheoutdoor temperature is low but thehumidityishigh,the heat exchanger in the outdoorunitmayfrostupafter a
certainperiod of operation, thus decreasingtheheatingeffect in the room. When thisoccurs,thedefrost cycle is automati-
callyactivated,temporarilyhaltingtheheatingmodefunctionforaperiod of 8 to 10 minutes.
Boththe indoor fan andoutdoorfan will be stoppedduringthe defrost cycle.
Duringthedefrost cycle, the indicator ontheindoorunitwill blink and in some casesyoumaynoticesteam flowing from the
indoorunit. This is caused bythequick defrost cycle.
Heatingmodewillautomaticallyresumeitsoperationuponcompletionofthedefrostcycle.
Heating Mode = Principle and Special Functions
Special Anti-cold-air Function
Wheninthe heating mode, if the indoorheatexchangerfailsto reach a specific temperaturedegreeinthefollowing3 instances, the
indoorfan will not bestartedthereby avoiding to blowcoldairinto the space (within3minutes):
1) Start of heating mode; 2) End of auto defrost; 3) Heating under low ambient temperature
Conditions that Inhibit the Unit from Operating Normally
Undertemperatureranges as specified below,aprotectiondevicemaybeactivated which will stop theunitfromoperating.
Outdoor temperature
over 24°C Outdoor temperature Room
over 43°C temperature
Heating Outdoor temperature Cooling Dehumidifying below 18°C
Mode below -7°C Mode Mode
Room temperature Room temperature
over 27°C below 21°C
If the unit isrunforlongperiods in cooling or dehumidifyingmodeswhentherelative humidity is higher than80%(doorsand
windows are open), condensing may occur near the air outlet.

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System Description

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Remote Control Description
Functions of the Remote Control Unit
Notes:
1) Ascertain that no obstructions are in the path between the remote control and the unit.
2) Do not drop or toss the remote control.
3) Do not expose the remote control to direct sunlight.
4) On a restart of the unit, it can automatically resume the previous running mode prior to being
stopped. The oudoor unit starts a bit later.
TEMP+ & TEMP- Button:
In the COOL, DRY, FAN or
HEAT modes, press either of
these two buttons to set the
desired temperature. Tem-
perature setting range is 16°C
- 30°C. Temperature setting
can be saved in the sistem’s
memory under each mode.
FAN SPEEDButton:
At start-up, in theAUTO, COOL,
FAN, or HEAT modes, press
this button to select the Fan
Speed: Auto, Low, Medium or
High. In the DRY mode, the fan
speed is Low. The FAN SPEED
setting can be saved in the
system’s memoriy under
various modes.
MODEButton:
At unit start-up, press this
button to select the operating
mode:AUTO,COOL, DRY,FAN,
HEAT.
CLOCKButton:
To adjust the CLOCK function,
press this button once. The
clock icon on the screen will
flash. To increase the hours,
press and hold the TIME+
button and the seconds and
minutes digits will advance to
the desired setting. To
decrease the hours, press
and hold the TIME- button and
the seconds and minutes
digits will turn back the time to
the desired setting. After
reaching the desired time,
press the CLOCK button once
again to confirm the setting.
SLEEPButton:
In the COOL, DRY or HEAT
modes , press this button
once to start the SLEEP
function. To stop this function,
press this button once again.

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Remote Control Description
T-ON Button:
Press this button once and
the minute digit will be
increased by one. If you
press the button over 1
second, the minutes will be
increased in tens. To
decrease the time use the
TIME- button, in the same
manner as described for the
TIME+button.
Liquid crystal display
showingallfunctions.
ON / OFFButton:
Press this button to start the
unit. Press it again to stop
the unit.
CANCELButton:
press this button once to
cancel all TIMER settings.
T-OFF Button:
Press this button once to set
the function. The OFF icon on
the screen will flash. This
function is available in both
ON or OFF modes. For
setting, refer to the T-ON
Button instructions.
SWING Button:
When the uit is in operation,
press this button once to
initiate the automatic swing
movement of the louvers.
Press it once again to stop
the movement of louvers.
When pressing the button
twice in one second, the light
on the panel of the indoor
unit will light up. When
pressing it twice within one
second again, the light will
TIME+&TIME- Buttons:
For operating instructions,
refer to theT-ON Button
section.

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Remote Control Description
Inserting batteries in the Remote Control Unit
1) Slide open the back cover of the remote control.
2) Insert twoAAAbatteries
3) Replace the cover
NOTES:
•Be sure not to mix the worn batteries with the new batteries.
•Removebatterieswhen not in use for an extended period.
•Batteries should not be used longer than a year.
•The remote control should be at a distance of minimum 1 meter away from a television set
or other audio device.
Emergency Operation
If the wireless remote control is lost or broken, use the manual
switch inside de unit. This will place the system in the AUTO mode,
thus settings for fan speed and temperature cannot be changed. To
allow for control, using a ball point pen or similar device, do the
following:
To turn the unit ON: With the unit off, locate the Manual Switch and
with the ball point pen press the manual switch as shown. The unit
will automatically go into the AUTO state of operation. The microcom-
puter will detect the indoor temperature to select COOL, HEAT, FAN to
achieve the degree of comfort.
To turn the unit OFF: With the unit on, locate the manual switch
STOP button. The unit will stop running.

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Care and Maintenance

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Care and Maintenance

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Troubleshooting

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Troubleshooting

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Troubleshooting

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Installation Recommendations