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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 ......... 6
5. PUMPING DOWN ........................................................................ 7
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.
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 Follow the instructions detailed in the installation manual.
Incomplete installation could cause fire or electric shock, injury due to the unit
falling, or leakage of water.
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I When installing the unit, use appropriate protective equipment and tools
for safety.
Failure to do so could cause injury.
I 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.
I 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.
I 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.
I Do not damage the wires.
Damaged wires could cause fire.
I 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.
I Use the specified wires to securely connect the indoor and outdoor units.
Attach the wires firmly to avoid applying stress to the terminal block.
Improper connection could cause fire.
I Do not install the unit in a place where flammable gas may leak.
If gas leaks and accumulates around the unit, it could cause an explosion.
I 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 fire or an electric shock.
I 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, 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 fire. If loose parts are found on the power supply
plug, replace it.
I 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.
I Do not touch the air inlet or the aluminum fins of the outdoor unit.
This could cause injury.
I 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 fire. Keep the area around the unit clean.
I When there are the ports which are not used, make sure their nuts are
tightened securely.
1-2. SPECIFICATIONS
Model
Rated Voltage
MXZ-2C20NA4
*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.
1
Power supply
Max. pipe length per indoor unit /
Frequency
208 / 230 V
60 Hz
82 ft. (25 m) / 164 ft. (50 m)
Phillips screwdriver
Level
Scale
Utility knife or scissors
Torque wrench
Wrench (or spanner)
WARNING
(Could lead to death or serious injury, etc.)
I 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 fire or an electric shock.
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. 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 fire, harmful gas could be generated.
If refrigerant gas leaks indoors, and comes into contact with the flame of a fan
heater, space heater, stove, etc., harmful gases will be generated.
I 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.
I 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.
I 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.
I Fasten a flare nut with a torque wrench as specified in this manual.
If fastened too tight, a flare nut could break and cause refrigerant leakage.
I Install the unit according to national wiring regulations.
I 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.
I When opening or closing the valve below freezing temperatures, refrig-
erant may spurt out from the gap between the valve stem and the valve
body, resulting in injuries.
CAUTION
(Could lead to serious injury when operated incorrectly.)
I When charging the refrigerant system with additional refrigerant, be sure
to use liquid refrigerant.
Adding gas refrigerant may change the composition of the refrigerant in the
system and affect normal operation of the air conditioner. Also, charge the
liquid refrigerant slowly, otherwise the compressor will be locked. To maintain
the high pressure of the gas cylinder, warm the gas cylinder with warm water
(under 104°F (40°C)) during cold season. But never use naked fire or steam.
Pipe length and height difference *1, *2, *3, *4, *5, *6, *8
Max. height
for multi-system
difference
49 ft. (15 m)
*7 If pipe length exceeds 131.2 ft. (40 m), additional refrigerant (R410A) charge
is required. (No additional charge is required for pipe length less than 131.2 ft.
(40 m).)
Additional refrigerant (ft.) = A ×
Additional refrigerant (m) = A × (pipe length (m) - 40)
*8 The piping specification table does not provide a minimum line set length.
However, indoor units with connected piping length less than 10 ft. (3m) could
produce intermittent noise during normal system operation in very quiet envi-
ronments. Please be aware of this important information when installing and
locating the indoor unit within the conditioned space.
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
Max. no. of bends per indoor unit /
for multi system
1.08 oz each 5 ft.
25 / 50
(pipe length (ft.) - 131.2)
5
Refrigerant
adjustment A *7
(20 g/m)
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