En-1
n
Do not install the unit by yourself (user).
Incomplete installation could cause fire or electric shock, injury due to the unit
falling, or leakage of water. Consult the dealer from whom you purchased the
unit or a qualified installer.
n
Perform the installation securely referring to the installation manual.
Incomplete installation could cause fire 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 which 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 insufficient or there is incomplete electrical
work, it could result in a fire or an electric shock.
n
Do not damage the wires by applying excessive pressure with parts or
screws.
Damaged wires could cause fire.
n
Be sure to cut off the main power in case of setting up the indoor P.C.
board or wiring works.
Failure to do so could cause electric shock.
n
Use the specified wires to connect the indoor and outdoor units securely
and attach the wires firmly to the terminal block connecting sections so
the stress of the wires is not applied to the sections.
Incomplete connecting and securing could cause fire.
n
Do not install the unit in a place where inflammable gas may leak.
If gas leaks and accumulates in the area around the unit, it could cause an
explosion.
n
Do not use intermediate connection of the power cord or the extension
cord and do not connect many devices to one AC outlet.
It could cause a fire or an electric shock due to defective contact, defective
insulation, exceeding the permissible current, etc.
n
Be sure to use the parts provided or specified parts for the installation
work.
The use of defective parts could cause an injury or leakage of water due to a
fire, an electric shock, the unit falling, etc.
n
When plugging the power supply plug into the outlet, make sure that there is
no dust, clogging, or loose parts in both the outlet and the plug. Make sure
that the power supply plug is pushed completely into the outlet.
If there is dust, clogging, or loose parts on the power supply plug or the outlet, it
could cause electric shock or fire. If loose parts are found on the power supply
plug, replace it.
n
Attach the electrical cover to the indoor unit and the service panel to the
outdoor unit securely.
If the electrical cover of the indoor unit and/or the service panel of the outdoor
unit are not attached securely, it could result in a fire or an electric shock due
to dust, water, etc.
n
When installing, relocating, or servicing the unit, make sure that no sub-
stance other than the specified 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 specified 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. If refrigerant leaks
during installation, ventilate the room.
If refrigerant comes in contact with a fire, harmful gas could be generated. Refriger
-
ant leakage may cause suffocation. Ventilate the room.
n
Check that the refrigerant gas does not leak after installation has been
completed.
If refrigerant gas leaks indoors, and comes into contact with the flame of a fan
heater, space heater, stove, etc., harmful substances will be generated.
n
Use appropriate tools and piping materials for installation.
The pressure of R410A is 1.6 times more than R22. Not using appropriate
tools or materials and incomplete installation could cause the pipes to burst
or 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. This could cause the pipes to burst
or injury.
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
when the stop valve is open, air could be drawn in and the pressure in the
refrigeration cycle could become abnormally high. This could cause the pipes
to burst or injury.
n
Fasten a flare nut with a torque wrench as specified in this manual.
If fastened too tight, a flare nut may break after a long period and cause
refrigerant leakage.
n
The unit shall be installed in accordance with national wiring regulations.
n
Ground the unit correctly.
Do not connect the ground to a gas pipe, water pipe, lightning rod or telephone
ground. Defective grounding could cause electric shock.
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 fire.
1-2. SPECIFICATIONS
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 specified 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.
CAUTION
(Could lead to serious injury in particular environments when operated incorrectly.)
n
Perform the drainage/piping work securely according to the installation
manual.
If there is defect in the drainage/piping work, water could drop from the unit,
soaking and damaging household goods.
n
Do not touch the air inlet or the aluminum fins of the outdoor unit.
This could cause injury.
n
Do not install the outdoor unit where small animals may live.
If small animals enter and touch the electric parts inside the unit, it could
cause a malfunction, smoke emission, or fire. Also, advise user to keep the
area around the unit clean.
WARNING
(Could lead to death, serious injury, etc.)
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 ...............................................4
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 in-
door unit / for multi system Refrigerant adjustment A *7
MXZ-3C24NA2
MXZ-3C30NA2
MXZ-4C36NA2
208 / 230 V
60 Hz
82 ft. (25 m) / 230 ft. (70 m)
49 ft. (15 m)
25 / 70
1.08 oz each 5 ft. (20 g/m)
*1 Never use pipes with thickness less than specified. The pressure resistance
will be insufficient.
*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 specific gravity
*6 Be sure to use the insulation of specified thickness. Excessive thickness may
cause incorrect installation of the indoor unit and insufficient 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)
1. BEFORE INSTALLATION
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