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Contents
1. Safety precautions
1.1. Before installation and electric work
ss
ss
s Before installing the unit, make sure you read all the “Safety
precautions”.
ss
ss
s The “Safety precautions” provide very important points re-
garding safety. Make sure you follow them.
Symbols used in the text
Warning:
Describes precautions that should be observed to prevent danger of injury
or death to the user.
Caution:
Describes precautions that should be observed to prevent damage to the
unit.
Warning:
Carefully read the labels attached to the outdoor unit.
Warning:
• Ask the dealer or an authorized technician to install the air conditioner.
- Improper installation by the user may result in water leakage, electric shock,
or fire.
• Install the unit at a place that can withstand its weight.
-Failure to do so may cause the unit to fall down, resulting in injuries and
damage to the unit.
• Use the specified cables for wiring. Make the connections securely so
that the outside force of the cable is not applied to the terminals.
- Inadequate connection and fastening may generate heat and cause a fire.
• Prepare for strong winds and earthquakes and install the unit at the speci-
fied place.
- Improper installation may cause the unit to topple and result in injury and
damage to the unit.
•Always use filters and other accessories specified by Mitsubishi Electric.
- Ask an authorized technician to install the accessories. Improper installation
by the user may result in water leakage, electric shock, or fire.
•Never attempt to repair the unit without the proper qualifications. If the
air conditioner must be repaired consult the dealer, contractor or qualified
Refrigeration Engineer.
- If the unit is repaired improperly, water leakage, electric shock, or fire may
result.
• Do not touch the heat exchanger fins.
- Improper handling may result in injury.
• If refrigerant gas leaks during installation work, ventilate the room.
- If the refrigerant gas comes into contact with a flame, poisonous gases will
be released.
• Install the air conditioner according to this Installation Manual.
- If the unit is installed improperly, water leakage, electric shock, or fire may
result.
•Have all electric work done by a licensed electrician according to “Electric
Facility Engineering Standard” and “Interior Wire Regulations” and the
instructions given in this manual and always use a dedicated power
supply.
- If the power source capacity is inadequate or electric work is performed im-
properly, electric shock and fire may result.
• Securely install the outdoor unit terminal cover (panel).
- If the terminal cover (panel) is not installed properly, dust or water may enter
the outdoor unit and fire or electric shock may result.
• When installing and moving the air conditioner to another site, do not
charge it with a refrigerant different from the refrigerant specified on the
unit.
- If a different refrigerant or air is mixed with the original refrigerant, the refrig-
erant cycle may malfunction and the unit may be damaged.
• If the air conditioner is installed in a small room, measures must be taken
to prevent the refrigerant concentration from exceeding the safety limit if
the refrigerant should leak.
- Consult the dealer regarding the appropriate measures to prevent the safety
limit from being exceeded. Should the refrigerant leak and cause the safety
limit to be exceeded, hazards due to lack of oxygen in the room could result.
• When moving and reinstalling the air conditioner, consult the dealer or
an authorized technician.
- If the air conditioner is installed improperly, water leakage, electric shock, or
fire may result.
• After completing installation work, make sure that refrigerant gas is not
leaking.
- If the refrigerant gas leaks and is exposed to a fan heater, stove, oven, or
other heat source, it may generate noxious gases.
• Do not reconstruct or change the settings of the protection devices.
- If the pressure switch, thermal switch, or other protection device is shorted
or operated forcibly, or parts other than those specified by Mitsubishi Electric
are used, fire or explosion may result.
•To dispose of this product, consult your dealer.
• The installer and system specialist shall secure safety against leakage
according to local regulation or standards.
- Choose the appropriate wire size and the switch capacities for the main power
supply described in this manual if local regulations are not available.
•Pay special attention to the place of installation, such as a basement, etc.
where refrigeration gas can accumulate, since refrigerant is heavier than
the air.
• For outdoor units that allow outside air intake to the indoor unit, the
installation site must be carefully chosen to ensure only clean air can
enter the room.
- Direct exposure to outdoor air may have harmful effects on people or food.
1.2. Precautions for devices that use R410A
refrigerant
Caution:
• Do not use existing refrigerant piping.
- The old refrigerant and refrigerant oil in the existing piping contains a large
amount of chlorine which may cause the refrigerant oil of the new unit to
deteriorate.
- R410A is a high-pressure refrigerant and can cause the existing piping to
burst.
• Use refrigerant piping made of phosphorus deoxidized copper and cop-
per alloy seamless pipes and tubes. In addition, be sure that the inner
and outer surfaces of the pipes are clean and free of hazardous sulphur,
oxides, dust/dirt, shaving particles, oils, moisture, or any other contami-
nant.
- Contaminants on the inside of the refrigerant piping may cause the refriger-
ant oil to deteriorate.
• Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing. (Store elbows and
other joints in a plastic bag.)
- If dust, dirt, or water enters the refrigerant cycle, deterioration of the oil and
compressor failure may result.
1. Safety precautions ...................................................................................... 2
1.1. Before installation and electric work .......................................... 2
1.2. Precautions for devices that use R410A refrigerant .................. 2
1.3. Before installation ...................................................................... 3
1.4. Before installation (relocation) - electrical work ......................... 3
1.5. Before starting the test run ........................................................ 3
2. About the product ....................................................................................... 3
3. Combination of outdoor unit ........................................................................ 4
4. Specifications .............................................................................................. 4
5. Parts included list ........................................................................................ 4
6. Space required for unit installation and operation ....................................... 4
7. Transporting the unit ................................................................................... 5
8. Installation of unit ........................................................................................ 6
8.1. Installation ................................................................................. 6
9. Refrigerant piping installation ..................................................................... 6
9.1. Caution ...................................................................................... 6
9.2. Refrigerant piping system.......................................................... 7
10. Additional refrigerant charge ....................................................................... 9
10.1. Calculation of additional refrigerant charge ............................... 9
10.2. Precautions concerning piping connection and valve
operation ................................................................................. 10
10.3. Airtight test, evacuation, and refrigerant charging ................... 11
10.4. Thermal insulation of refrigerant piping ................................... 12
11. Wiring (For details, refer to the installation manual of each indoor/outdoor
unit and controller.) ................................................................................... 13
11.1. Caution .................................................................................... 13
11.2. Control box and connecting position of wiring ......................... 13
11.3. Wiring transmission cables ...................................................... 13
11.4. Wiring of main power supply and equipment capacity ............ 16
12. Test run/Typical unit operation .................................................................. 17
13. Rating plate information ............................................................................ 17