Installation Guide

En-1
1-2. SPECIFICATIONS
1. BEFORE INSTALLATION
1-1. THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY
• Be sure to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY” before installing the air conditioner.
• Besuretoobservethewarningsandcautionsspeciedhereastheyincludeimportantitemsrelatedtosafety.
• After reading this manual, be sure to keep it together with the OPERATING INSTRUCTIONS for future reference.
Required Tools for Installation
Phillipsscrewdriver
Level
Scale
Utility
knife or scissors
Torque wrench
Wrench (or spanner)
5/32 in. (4 mm) hexagonal
wrench
Flare
tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter with reamer
ENGLISH
CONTENTS
1. BEFORE INSTALLATION ............................................................ 1
2. OUTDOOR UNIT INSTALLATION ............................................... 3
3.
FLARING WORK AND PIPE CONNECTION ............................... 5
4.
PURGING PROCEDURES, LEAK TEST, AND TEST RUN ......... 5
5.
PUMPING DOWN ........................................................................7
Model
Power supply Pipe length and height difference *1, *2, *3, *4, *5, *6
Rated Voltage Frequency
Max.
pipe length per indoor
unit / for multi-system
Max. height difference
Max. no. of bends per
indoor unit / for multi system
Refrigerant adjustment A *7
MXZ-2C20NAHZ
208/230
V 60 Hz
82 ft (25 m)/164 ft (50 m)
49 ft (15 m) 25/80 1
.08 oz each 5 ft (20 g/m)
MXZ-3C24NAHZ
MXZ-3C30NAHZ
82
ft (25 m)/230 ft (70 m)
MXZ-5C42NA 82
ft (25 m)/262 ft (80 m)
*1Never use pipes with thickness less than specied. The pressure resist-
ance
willbeinsufcient.
*2 Use a copper pipe or a copper-alloy seamless pipe.
*3 Be careful not to crush or bend the pipe during pipe bending.
*4 Refrigerant pipe bending radius must be 4 in. (100 mm) or more.
*5Insulationmaterial:Heatresistingfoamplastic0.045specicgravity
*6Be sure to use the insulation of specied thickness. Excessive thickness
maycauseincorrectinstallationoftheindoorunitandinsufcientthickness
may cause dew drippage.
*7 If pipe length exceeds 98 ft (30 m), additional refrigerant (R410A) charge
is required. (No additional charge is required for pipe length less than
98
ft (30 m).)
Additional refrigerant (ft) = A ×
(pipe length (ft) - 98)
5
Additional refrigerant (m) = A × (pipe length (m) - 30)
n Do not install the unit by yourself (user).
 Incompleteinstallationcouldcausereorelectricshock,injuryduetotheunit
falling, or leakage of water. Consult the dealer from whom you purchased the
unitoraqualiedinstaller.
n Follow the instructions detailed in the installation manual.

Incompleteinstallationcouldcausereorelectricshock,injuryduetotheunit
falling, or leakage of water.
n When
installing the unit, use appropriate protective equipment and tools
for safety.
Failure to do so could cause injury.
n Install the unit securely in a place that can bear the weight of the unit.
If the installation location cannot bear the weight of the unit, the unit could fall
causing injury.
n Perform electrical work according to the installation manual and be sure
to use an exclusive circuit. Do not connect other electrical appliances to
the circuit.

Ifthecapacityofthepowercircuitisinsufcientorthereisincompleteelectrical
work,itcouldresultinareoranelectricshock.
n Ground the unit correctly.
Do not connect the ground wire to a gas pipe, water pipe, lightning rod or
telephoneground.Defectivegroundingcouldcauseelectricshock.
n Do not damage the wires.

Damagedwirescouldcausere.
n Be sure to shut off the main power when setting up the indoor P.C. board
or wiring.
Failure to do so could cause electric shock.
n
Usethespeciedwirestosecurelyconnecttheindoorandoutdoorunits.
Attachthewiresrmlytoavoidapplyingstresstotheterminalblock.
 Improperconnectioncouldcausere.
n Do
notinstalltheunitinaplacewhereammablegasmayleak.
If gas leaks and accumulates around the unit, it could cause an explosion.
n Do
not use intermediate connection of the power cord or the extension
cord.Do not connect many devices to one AC outlet.

Itcouldcauseareoranelectricshock.
n Use
thepartsprovidedorspeciedpartsfortheinstallationwork.
 Theuseofdefectivepartscouldcauseaninjuryorleakageofwaterduetoa
re,anelectricshock,theunitfalling,etc.
n When plugging the power supply plug into the outlet, make sure that there
is no dust, blockage, or loose parts both in the outlet and on the plug.
Verify that the power supply plug is completely in the outlet.
If there is dust, blockage, or loose parts on the power supply plug or the outlet,
itcouldcauseelectricshockorre.Ifloosepartsarefoundonthepowersupply
plug, replace it.
n Securely attach the electrical cover to the indoor unit and the service
panel to the outdoor unit.

Iftheelectricalcoveroftheindoorunitand/ortheservicepaneloftheoutdoor
unit are not attached securely, dust, water, etc. could collect in the unit and
couldcauseareoranelectricshock.
n
When installing, relocating, or servicing the unit, make sure that no substance
otherthanthespeciedrefrigerant(R410A)enterstherefrigerantcircuit.
Any presence of foreign substance such as air can cause abnormal pressure
rise and may result in explosion or injury. The use of any refrigerant other than
thatspeciedforthesystemwillcausemechanicalfailure,systemmalfunction,
or unit breakdown. In the worst case, this could lead to a serious impediment
to securing product safety.
n Do not discharge the refrigerant into the atmosphere. Check that the
refrigerant gas does not leak after installation has been completed. If
refrigerant leaks during installation, ventilate the room.
 Ifrefrigerantcomesincontactwithare,harmfulgascouldbegenerated.
 Ifrefrigerantgasleaksindoors,andcomesintocontactwiththeameofafan
heater,spaceheater,stove,etc.,harmfulgaseswillbegenerated.
n Use appropriate tools and piping materials for installation.
The pressure of R410A is 1.6 times higher than R22. Not using the appropri-
ate
tools and materials, or improper installation could cause the pipes to burst
causing an injury.
n When pumping down the refrigerant, stop the compressor before discon-
necting the refrigerant pipes.
If the refrigerant pipes are disconnected while the compressor is running and
thestopvalveisopen,aircouldbedrawninandthepressureintherefrigera-
tion
cycle could become abnormally high, causing the pipes to burst.
n When installing the unit, securely connect the refrigerant pipes before
starting the compressor.
If the compressor is started before the refrigerant pipes are connected and the
stopvalveisopen,aircouldbedrawninandthepressureintherefrigeration
cycle could become abnormally high, causing the pipes to burst.
n Fasten
aarenutwithatorquewrenchasspeciedinthismanual.
 Iffastenedtootight,aarenutcouldbreakandcauserefrigerantleakage.
n Install the unit according to national wiring regulations.
n Be sure to install a Ground Fault Interrupt (GFI) circuit breaker.
Failure to install a Ground Fault Interrupt (GFI) circuit breaker may result in
electricshockorre.
n Perform
the drainage/piping work securely according to the installation
manual.
If there is defect in the drainage/piping work, water could drip from the unit,
and damage household items.
n
Donottouchtheairinletorthealuminumnsoftheoutdoorunit.
This could cause injury.
n Do not install the outdoor unit where small animals may live.
If small animals enter the unit and damage its electrical parts, it could cause a
malfunction,smokeemission,orre.Keeptheareaaroundtheunitclean.
CAUTION
(Could lead to serious injury when operated incorrectly.)
WARNING
(Could lead to death or serious injury, etc.)
BH79A088H01_en.indd 1 2014/08/05 13:34:46