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Contents
1. Safety precautions .....................................................................................2
2. Selecting the installation location ..............................................................3
3. Installation diagram ...................................................................................3
4. Installing the indoor unit ............................................................................3
5. Refrigerant pipe and drain pipe .................................................................6
6. Electrical work ...........................................................................................7
7. Installing the grille ....................................................................................10
8. Test run ....................................................................................................12
1. Safety precautions
1.2. Before installation or relocation
Caution:
• Be extremely careful when transporting the units. Two or more persons are
needed to handle the unit, as it weighs 20 kg, 44 lbs or more. Do not grasp
the packaging bands. Wear protective gloves as you can injure your hands
on the fi ns or other parts.
• Be sure to safely dispose of the packaging materials. Packaging materials,
such as nails and other metal or wooden parts may cause stabs or other
injuries.
• Thermal insulation of the refrigerant pipe is necessary to prevent condensation.
If the refrigerant pipe is not properly insulated, condensation will be formed.
Warning:
• Ask a dealer or an authorized technician to install the unit.
• For installation work, follow the instructions in the Installation Manual and use
tools and pipe components specifi cally made for use with refrigerant specifi ed
in the outdoor unit installation manual.
• The unit must be installed according to the instructions in order to minimize
the risk of damage from earthquakes, typhoons, or strong winds. An incor-
rectly installed unit may fall down and cause damage or injuries.
• The unit must be securely installed on a structure that can sustain its
weight.
• If the air conditioner is installed in a small room, measures must be taken to
prevent the refrigerant concentration in the room from exceeding the safety
limit in the event of refrigerant leakage. Should the refrigerant leak and cause
the concentration limit to be exceeded, hazards due to lack of oxygen in the
room may result.
• Ventilate the room if refrigerant leaks during operation. If refrigerant comes
into contact with a fl ame, poisonous gases will be released.
• All electric work must be performed by a qualifi ed technician according to
local regulations and the instructions given in this manual.
• Use only specifi ed cables for wiring.
• The terminal block cover panel of the unit must be fi rmly attached.
• Use only accessories authorized by Mitsubishi Electric and ask a dealer or
an authorized technician to install them.
• The user should never attempt to repair the unit or transfer it to another loca-
tion.
• After installation has been completed, check for refrigerant leaks. If refriger-
ant leaks into the room and comes into contact with the fl ame of a heater or
portable cooking range, poisonous gases will be released.
1.1. Before installation (Environment)
Caution:
• Do not use the unit in an unusual environment. If the air conditioner is installed
in areas exposed to steam, volatile oil (including machine oil), or sulfuric gas,
areas exposed to high salt content such as the seaside, the performance can
be signifi cantly reduced and the internal parts can be damaged.
• Do not install the unit where combustible gases may leak, be produced, fl ow,
or accumulate. If combustible gas accumulates around the unit, fi re or explo-
sion may result.
• Do not keep food, plants, caged pets, artwork, or precision instruments in the
direct airfl ow of the indoor unit or too close to the unit, as these items can be
damaged by temperature changes or dripping water.
• When the room humidity exceeds 80% or when the drainpipe is clogged,
water may drip from the indoor unit. Do not install the indoor unit where such
dripping can cause damage.
• When installing the unit in a hospital or communications offi ce, be prepared for
noise and electronic interference. Inverters, home appliances, high-frequency
medical equipment, and radio communications equipment can cause the air
conditioner to malfunction or breakdown. The air conditioner may also affect
medical equipment, disturbing medical care, and communications equipment,
harming the screen display quality.
• Place thermal insulation on the pipes to prevent condensation. If the drain-
pipe is installed incorrectly, water leakage and damage to the ceiling, fl oor,
furniture, or other possessions may result.
• Do not clean the air conditioner unit with water. Electric shock may result.
• Tighten all fl are nuts to specifi cation using a torque wrench. If tightened too
much, the fl are nut can break after an extended period.
•
If the unit is run for long hours when the air above the ceiling is at high tem-
perature/high humidity (dew point above 26 ºC, 79 ºF), dew condensation may
be produced in the indoor unit or the ceiling materials. When operating the units
in this condition, add insulation material (10-20 mm, 25/64-25/32 inch) to the
entire surface of the unit and ceiling materials to avoid dew condensation.
1.3. Before electric work
Caution:
• Be sure to install circuit breakers. If not installed, electric shock may result.
• For the power lines, use standard cables of suffi cient capacity. Otherwise, a
short circuit, overheating, or fi re may result.
• When installing the power lines, do not apply tension to the cables.
• Be sure to ground the unit. If the unit is not properly grounded, electric shock
may result.
• Use circuit breakers (ground fault interrupter, isolating switch (+B fuse), and
molded case circuit breaker) with the specifi ed capacity. If the circuit breaker
capacity is larger than the specifi ed capacity, breakdown or fi re may result.
1.4. Before starting the test run
Caution:
• Turn on the main power switch more than 12 hours before starting operation.
Starting operation just after turning on the power switch can severely damage
the internal parts.
• Before starting operation, check that all panels, guards and other protective
parts are correctly installed. Rotating, hot, or high voltage parts can cause
injuries.
• Do not operate the air conditioner without the air fi lter set in place. If the air
fi lter is not installed, dust may accumulate and breakdown may result.
• Do not touch any switch with wet hands. Electric shock may result.
• Do not touch the refrigerant pipes with bare hands during operation.
• After stopping operation, be sure to wait at least fi ve minutes before turning off
the main power switch. Otherwise, water leakage or breakdown may result.
► Before installing the unit, make sure you read all the “Safety precau-
tions”.
► Please report to your supply authority or obtain their consent before
connecting this equipment to the power supply system.
Warning:
Describes precautions that must be observed to prevent danger of injury or
death to the user.
Caution:
Describes precautions that must be observed to prevent damage to the unit.
After installation work has been completed, explain the “Safety precautions,” use, and
maintenance of the unit to the customer according to the information in the Operation
Manual and perform the test run to ensure normal operation. Both the Installation
Manual and Operation Manual must be given to the user for keeping. These manuals
must be passed on to subsequent users.
: Indicates a part which must be grounded.
Warning:
Carefully read the labels affi xed to the main unit.
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