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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 ......... 7
5. PUMPING DOWN ........................................................................ 8
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 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.
WARNING
(Could lead to death, serious injury, etc.)
I 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.
I 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.
I When installing the unit, use appropriate protec-
tive equipment and tools for safety.
Failure to do so could cause injury.
I 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.
I Perform electrical work according to the instal-
lation manual and be sure to use an exclusive
circuit. Do not connect other electrical appli-
ances 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.
I Do not damage the wires by applying excessive
pressure with parts or screws.
Damaged wires could cause fire.
I Be sure to cut off the main power in case of set-
ting up the indoor P.C. board or wiring works.
Failure to do so could cause electric shock.
I 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.
I Do not install the unit in a place where inflam-
mable gas may leak.
If gas leaks and accumulates in the area around the
unit, it could cause an explosion.
I 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.
CAUTION
(Could lead to serious injury in particular environments when operated incorrectly.)
I Perform the drainage/piping work securely ac-
cording to the installation manual.
If there is defect in the drainage/piping work, water
could drop from the unit, soaking and damaging
household goods.
1-2. SPECIFICATIONS
Power supply
Model
Rated Voltage
MXZ-3C24NA4
MXZ-3C30NA4
208 / 230 V
MXZ-4C36NA4
*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.
en-1
I 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.
I 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.
I 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.
I When installing, relocating, or servicing the
unit, make sure that no substance 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.
I Do not discharge the refrigerant into the
atmosphere. If refrigerant leaks during instal-
lation, ventilate the room.
If refrigerant comes in contact with a fire, harmful
gas could be generated. Refrigerant leakage may
cause suffocation. Ventilate the room.
I 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.
I Do not touch the air inlet or the aluminum fins
of the outdoor unit.
This could cause injury.
Max. pipe length per indoor
Frequency
unit / for multi-system
60 Hz
82 ft. (25 m) / 230 ft. (70 m)
Phillips screwdriver
Level
Scale
Utility knife or scissors
Torque wrench
Wrench (or spanner)
I Use appropriate tools and piping materials for
I When pumping down the refrigerant, stop the
I When installing the unit, securely connect the
I Fasten a flare nut with a torque wrench as
If fastened too tight, a flare nut may break after a
I The unit shall be installed in accordance with
I Ground the unit correctly.
I Be sure to install a Ground Fault Interrupt (GFI)
Failure to install a Ground Fault Interrupt (GFI)
I When opening or closing the valve below
I Do not alter the unit. It may cause fire, electric
I Do not install the outdoor unit where small
Pipe length and height difference *1, *2, *3, *4, *5, *6, *7, *8
Max. no. of bends per indoor
Max. height difference
unit / for multi system
49 ft. (15 m)
*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 ×
Additional refrigerant (m) = A × (pipe length (m) – 30)
*8 When connecting two PAA-A18 units, be sure to provide the total piping length of
33 ft (10 m) or more and change the gas pipe diameter to ø5/8 inch (15.88 mm).
Required Tools for Installation
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
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.
compressor before disconnecting the refriger-
ant 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 refrigeration cycle could become abnormally
high. This could cause the pipes to burst or injury.
refrigerant pipes before starting the compres-
sor.
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.
specified in this manual.
long period and cause refrigerant leakage.
national wiring regulations.
Do not connect the ground to a gas pipe, water
pipe, lightning rod or telephone ground. Defective
grounding could cause electric shock.
circuit breaker.
circuit breaker may result in electric shock or fire.
freezing temperatures, refrigerant may spurt
out from the gap between the valve stem and
the valve body, resulting in injuries.
shock, injury or water leakage.
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.
Refrigerant adjustment A *7
25 / 70
1.08 oz each 5 ft. (20 g/m)
(pipe length (ft.) – 98)
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