Mitsubishi Electric R410A How to use

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Safety Precautions
Please read the following safety precautions carefully before installing the unit to ensure safety.
Make sure that this manual is passed on to the end user to retain for future reference.
Retain this manual for future reference. When the unit is reinstalled or repaired, have this manual available to those who pro-
vide these services. Make sure that this manual is passed on to any future users.
All electric work must be performed by qualified personnel.
Air tightness test must be performed by qualified personnel.
[1] General Precautions
Indicates a risk of death or serious injury.
Indicates a risk of serious injury or structural damage.
General Precautions
Do not use refrigerant other than the type in-
dicated in the manuals provided with the
unit and on the nameplate. Doing so may
cause the unit or pipes to burst, or result in
explosion or fire during use, during repair,
or at the time of disposal of the unit. It may
also be in violation of applicable laws. MIT-
SUBISHI ELECTRIC CORPORATION cannot
be held responsible for malfunctions or ac-
cidents resulting from the use of the wrong
type of refrigerant.
Do not install the unit in a place where large
amounts of oil, steam, organic solvents, or
corrosive gases, such as sulfuric gas, are
present or where acidic/alkaline solutions
or sprays containing sulfur are used fre-
quently. These substances can compro-
mise the performance of the unit or cause
certain components of the unit to corrode,
which can result in refrigerant leakage, wa-
ter leakage, injury, electric shock, malfunc-
tions, smoke, or fire.
Donottrytodefeatthesafetyfeaturesofthe
unit or make unauthorized setting changes.
Forcing the unit to operate the unit by de-
feating the safety features of the devices
such as the pressure switch or the tempera-
ture switch, making unauthorized changes
to the switch settings, or using accessories
other than the ones recommended by Mit-
subishi Electric may result in smoke, fire, or
explosion.
Before installing, inspecting, or repairing
the unit, check that it is safe around the unit
andprevent any children from approaching.
There is a risk of an injury if a tool or other
object falls.
Do not modify. There is a risk of refrigerant
leaking, water leaking, injury, electric
shock, and fire.
When replacing a fuse, use a fuse of the
specified capacity and do not use steel wire
or copper wire instead. There is a risk of
rupture, fire, and explosion.
To reduce the risk of shorting, current leak-
age,electricshock,malfunctions,smoke,or
fire, do not splash water on electric parts.
To reduce the risk of electric shock, mal-
functions, smoke or fire, do not operate the
switches/buttons or touch other electrical
parts with wet hands.
To reduce the risk of pipe burst and explo-
sion, do not allow gas refrigerant and refrig-
erant oil to be trapped in the refrigerant
circuit.
Before performing cleaning, maintenance,
or inspection, stop operation and turn off
the main power. There is a risk of an injury
and electric shock. There is a risk of an inju-
ry from a fan or other rotating part.

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[2] Transportation and Installation
To reduce the risk of burns or frost bites, do
nottouch the refrigerantpipesor refrigerant
circuit components with bare hands during
and immediately after operation.
To reduce the risk of injury from falling
tools, keep children away while installing,
inspecting, or repairing the unit.
Keep the space well ventilated. Refrigerant
can displace air and cause oxygen starva-
tion. If leaked refrigerant comes in contact
with a heat source, toxic gas may be gener-
ated.
When there is an abnormality (burning
smell, etc.), stop operation and turn off the
power switch. Contact your dealer or cus-
tomer support. There is a risk of electric
shock, failure, and fire if operation is contin-
ued while there is an abnormality.
To reduce the risk of electric shock, smoke,
and fire due to infiltration of dust and water,
properly install all required covers and pan-
els on the terminal box and control box.
Toreduce the risk of injuryfromunitsfalling
or falling over, periodically check the instal-
lation base for damage.
Consultan authorized agencyforthe proper
disposal of the unit. Refrigerant oil and re-
frigerant that may be left in the unit pose a
risk of fire, explosion, or environmental pol-
lution.
To reduce the risk of being caught in rotat-
ing parts, electric shock, and burns, do not
operate the unit without all required panels
and guards being installed.
To reduce the risk of injury, do not sit,
stand, or place objects on the unit.
To reduce the risk of water leakage and mal-
functions, do not turn off the power immedi-
ately after stopping operation. Leave the
unit turned on for at least 5 minutes before
turning off the power.
Do not install the unit over things that are
vulnerable to water damage from condensa-
tion dripping.
To reduce the risk of injury, electric shock,
and malfunctions, do not touch or allow ca-
bles to come in contact with the edges of
components.
Toreduce the risk of injury,do not touch the
heat exchanger fins or sharp edges of com-
ponents with bare hands.
Always wear protective gears when touch-
ing electrical components on the unit. Sev-
eral minutes after the power is switched off,
residual voltage may still cause electric
shock.
When touching electrical parts, wear pro-
tective gear. There is a risk of a burn if you
touch a high-temperature part. There is a
risk of an electric shock if you touch a high-
voltage part.
To reduce the risk of injury, do not insert fin-
gers or foreign objects into air inlet/outlet
grills. If the unit is left on a damaged base, it
may fall and cause injury.
When performing work, wear protective
gear. There is a risk of an injury.
Do not release refrigerant into the atmo-
sphere. Collect and reuse the refrigerant, or
have it properly disposed of by an autho-
rized agency. Refrigerant poses environ-
mental hazards if released into the air.
Transportation and Installation
Lift the unit by placing the slings at desig-
nated locations. Support the outdoor unit
securely at four points to keep it from slip-
ping and sliding. If the unit is not properly
supported, it may fall and cause personal
injury.

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[3] Installation
To reduce the risk of injury, do not carry the
product by the PP bands that are used on
some packages.
To reduce the risk of injury, products weigh-
ing 20 kg or more should be carried by two
or more people.
Installation
Do not install the unit where there is a risk
of leaking flammable gas.
If flammable gas accumulates around the
unit, it may ignite and cause a fire or explo-
sion.
To reduce the risk of injury from coming in
contact with units, install units where they
are not accessible to people other than
maintenance personnel.
Do not modify. Installation work must be
performed by the dealer or a qualified per-
sonnel in accordance with the instructions
in the installation manual. There is a risk of
water leaking, injury, electric shock, and
fire.
Dispose of the packing material. There is a
risk of an injury.
Destroy the packing material. There is a risk
of a suffocation accident.
All drainage work should be performed by
the dealer or qualified personnel according
to the instructions detailed in the Installa-
tion Manual. Improper drainage work may
cause water leakage and resultant damage
to the furnishings.
Remove packing materials from the unit be-
fore operating the unit. Note that some ac-
cessories may be taped to the unit. Properly
install all accessories that are required. Fail-
ing to remove the packing materials or fail-
ing to install required accessories may
result in refrigerant leakage, oxygen depri-
vation, smoke, or fire.
Consult your dealer and take appropriate
measures to safeguard against refrigerant
leakageand resultant oxygen starvation.An
installation of a refrigerant gas detector is
recommended.
Any additional parts must be installed by
the dealer or qualified personnel. Only use
the parts specified by Mitsubishi Electric.
Installation by unauthorized personnel or
use of unauthorized parts or accessories
may result in water leakage, electric shock,
or fire.
Take appropriate safety measures against
wind gusts and earthquakes to prevent the
unit from toppling over and causing injury.
Toreduce the risk of injuryfromunitsfalling
or falling over, install the unit on a surface
that is strong enough to support its weight.
Do not install the unit over things that are
vulnerable to water damage. Provide an ad-
equate collective drainage system for the
drain water from unit as necessary.
To reduce the risk of damage to the unit and
resultant electric leak and electric shock,
keep small animals, snow, and rain water
from entering the unit by closing the gap in
the pipe and wire access holes.
To reduce the risk of rain water or drain wa-
ter from entering the room and damaging
the interior, drainage work must be per-
formed by your dealer or qualified person-
nel according to the instructions detailed in
the Installation Manual.

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[4] Piping Work
[5] Wiring Work
Piping Work
To reduce the risk of injury, including frost
bites, that may result from being blasted
with refrigerant, use caution when operat-
ing the refrigerant service valve. If refriger-
ant leaks out and comes in contact with an
open flame, toxic gases may be generated.
To reduce the risk of refrigerant catching
fire and causing burns, remove the refriger-
ant gas and the residual refrigerant oil in the
pipes before heating them.
To reduce the risk of pipe damage, refriger-
ant leakage, and oxygen deprivation, use
pipes that meet the pipe thickness specifi-
cations, which vary by the type of refriger-
ant used, pipe diameter, and pipe material.
To reduce the risk of pipe burst or explo-
sion,evacuatetherefrigerantcircuitusing a
vacuum pump, and do not purge the system
with refrigerant.
To reduce the risk of explosion and deterio-
ration of refrigerant oil caused by chloride,
do not use oxygen, flammable gas, or refrig-
erant that contains chloride as a pressuriz-
ing gas.
To prevent explosion, do not heat the unit
with refrigerant gas in the refrigerant circuit.
To reduce the risk of oxygen deprivation
and gas poisoning, check for gas leakage
and keep fire sources away.
Insulate pipe connections after completing
the air tightness test. Performing an air
tightness test with the pipe being insulated
may lead to failure to detect refrigerant leak-
age and cause oxygen deprivation.
To reduce the risk of pipe damage and re-
sultant refrigerant leakage and oxygen de-
privation, keep the field-installed pipes out
of contact with the edges of components.
To reduce the risk of pipe bursting and ex-
plosion due to abnormal pressure rise, do
not allow any substances other than R410A
(such as air) to enter the refrigerant circuit.
To keep the ceiling and floor from getting
wet due to condensation, properly insulate
the pipes.
Wiring Work
To reduce the risk of wire breakage, over-
heating, smoke, and fire, keep undue force
from being applied to the wires.
To reduce the risk of wire breakage, over-
heating, smoke, or fire, properly secure the
cables in place and provide adequate slack
in the cables so as not to stress the termi-
nals.
Do not use a mixture of solid wires and
stranded wires or wires of different sizes for
the power terminal block. If used, there is a
risk of smoke generation, ignition, and fire
due to a bad contact.
Tighten the screws of wiring terminals to
the specified torque. There is a risk of
smoke generation, ignition, and fire due to
screw looseness or a bad contact.
All electric work must be performed by a
qualified electrician according to the local
regulations,standards,andtheinstructions
detailed in the Installation Manual. Capacity
shortage to the power supply circuit or im-
proper installation may result in malfunc-
tion, electric shock, smoke, or fire.
To reduce the risk of electric shock, smoke,
or fire, install an inverter circuit breaker on
the power supply to each unit.
Use properly rated breakers and fuses (in-
vertercircuitbreaker,localswitch<switch+
fuse>, no-fuse breaker). The use of a break-
er with a breaking capacity greater than the
specified capacity may cause electric
shock, malfunctions, smoke, or fire.