Table Of Contents; Safety Precautions; Before Installation And Electric Work - Mitsubishi Electric CITY MULTI Y Series Installation Manual

Contents
1. Safety precautions ...................................................................................... 2
1.1. Before installation and electric work .......................................... 2
1.2. Precautions for devices that use R410A refrigerant .................. 3
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 units ..................................................................... 4
4. Specifications ............................................................................................. 4
5. Parts included list ....................................................................................... 4
6. Space required for unit installation and operation ...................................... 5
7. Transporting the unit ................................................................................... 6
8. Installation of unit ....................................................................................... 6
8.1. Installation ................................................................................. 6
9. Refrigerant piping installation ..................................................................... 7
9.1. Caution ...................................................................................... 7
9.2. Refrigerant piping system .......................................................... 8

1. Safety precautions

1.1. Before installation and electric work

s s s s s Before installing the unit, make sure you read all the "Safety
precautions".
s s s s 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.
Symbols used in the illustrations
: Indicates an action that must be avoided.
: Indicates that important instructions must be followed.
: Indicates a part which must be grounded.
: Beware of electric shock. (This symbol is displayed on the main unit label.)
<Color: yellow>
Warning:
Carefully read the labels attached to the outdoor unit.
HIGH VOLTAGE WARNING:
• Control box houses high-voltage parts.
• When opening or closing the front panel of the control box, do not let it
come into contact with any of the internal components.
• Before inspecting the inside of the control box, turn off the power, keep
the unit off for at least 10 minutes, and confirm that the voltage between
FT-P and FT-N on INV Board has dropped to DC20V or less.
(It takes about 10 minutes to discharge electricity after the power supply
is turned off.)
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 Elec-
tric.
- Ask an authorized technician to install the accessories. Improper installation
by the user may result in water leakage, electric shock, or fire.
2
10. Additional refrigerant charge .................................................................... 10
10.1. Calculation of additional refrigerant charge ............................. 10
10.2. Precautions concerning piping connection and valve
operation ................................................................................. 11
10.3. Airtight test, evacuation, and refrigerant charging ................... 12
10.4. Thermal insulation of refrigerant piping ................................... 13
11. Wiring (For details, refer to the installation manual of each indoor/outdoor
unit and controller.) ................................................................................... 14
11.1. Caution .................................................................................... 14
11.2. Control box and connecting position of wiring ......................... 14
11.3. Wiring transmission cables ...................................................... 15
11.4. Wiring of main power supply and equipment capacity ............ 18
12. Test run/Typical unit operation .................................................................. 20
13. Rating plate information ........................................................................... 20
• Never attempt to repair the unit without the proper qualifications. If the
air conditioner must be repaired consult the dealer, contractor or quali-
fied 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 the
"Electric Facility Engineering Standard", the "Wire Regulations in each
area" and the instructions given in this manual and always use a dedi-
cated 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 in-
stallation 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.