Tabla De Contenido; Safety Precautions; Before Installation And Electric Work; Precautions For Devices That Use R410A Or R407C Refrigerant - Mitsubishi Electric CITY MULTI Serie Manual De Instalación

Contents
1. Safety precautions ...................................................................................... 5
1.1. Before installation and electric work .......................................... 5
1.2. Precautions for devices that use R410A or R407C refrigerant .. 5
1.3. Before getting installed .............................................................. 6
1.4. Before getting installed (moved) - electrical work ...................... 6
1.5. Before starting the test run ........................................................ 6
2. Indoor unit accessories ............................................................................... 6
3. Selecting an installation site ....................................................................... 6
3.1. Securing installation and service space .................................... 7
3.2. Combining indoor units with outdoor units ................................ 7
4. Fixing hanging bolts .................................................................................... 7
4.1. Fixing hanging bolts .................................................................. 7
4.2. Ceiling hole and hanging bolt positions ..................................... 7
5. Installing the unit ......................................................................................... 7
5.1. Hanging the unit body ............................................................... 7
5.2. Confirming the unit's position and fixing hanging bolts ............. 7
5.3. Changing to rear intake specifications ...................................... 7

1. Safety precautions

1.1. Before installation and electric work

s Before installing the unit, make sure you read all the "Safety
precautions".
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.
: Indicates that caution should be taken with rotating parts. (This symbol is
displayed on the main unit label.) <Color: yellow>
: Beware of electric shock (This symbol is displayed on the main unit label.)
<Color: yellow>
Warning:
Carefully read the labels affixed to the main 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 air unit at a place that can withstand its weight.
- Inadequate strength may cause the unit to fall down, resulting in injuries.
• 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 typhoons and other strong winds and earthquakes and install
the unit at the specified place.
- Improper installation may cause the unit to topple and result in injury.
• Always use an air cleaner, humidifier, electric heater, 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 repair the unit. If the air conditioner must be repaired, consult the
dealer.
- 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.
• When handling this product, always wear protective equipment.
EG: Gloves, full arm protection namely boiler suit, and safety glasses.
- 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.
6. Refrigerant pipe and drain pipe specifications ............................................ 8
6.1. Refrigerant pipe and drain pipe specifications .......................... 8
6.2. Refrigerant pipe , drain pipe and filling port .............................. 8
6.3. Request for refrigerant piping connection ................................. 9
7. Connecting refrigerant pipes and drain pipes ............................................. 9
7.1. Refrigerant piping work ............................................................. 9
7.2. Drain piping work ....................................................................... 9
7.3. Confirming drain discharge ..................................................... 10
8. Electrical wiring ......................................................................................... 10
8.1. Power supply wiring ................................................................. 11
8.2. Connecting remote controller, indoor and outdoor
transmission cables ................................................................. 11
8.3. Connecting electrical connections ........................................... 11
8.4. Setting addresses .................................................................... 11
8.5. Sensing room temperature with the built-in sensor in
a remote controller .................................................................. 11
• Have all electric work done by a licensed electrician according to "Electric
Facility Engineering Standard" and "Interior Wire Regulations"and the in-
structions given in this manual and always use a special circuit.
- If the power source capacity is inadequate or electric work is performed improp-
erly, electric shock and fire may result.
• Keep the electric parts away from water (washing water etc.).
- It might result in electric shock, catching fire or smoke.
• 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
the 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 refrigerant
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 even 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 leak-
ing.
- 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 and
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.
• Do not use a leak detection additive.
1.2. Precautions for devices that use R410A
or R407C refrigerant
Caution:
• Do not use the existing refrigerant piping.
- The old refrigerant and refrigerator oil in the existing piping contains a large
amount of chlorine which may cause the refrigerator oil of the new unit to dete-
riorate.
• Use refrigerant piping made of C1220 (Cu-DHP) phosphorus deoxidized
copper as specified in the JIS H3300 "Copper and copper 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 contaminant.
- Contaminants on the inside of the refrigerant piping may cause the refrigerant
residual 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 trouble may result.
• Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil
to coat flares and flange connections.
- The refrigerator oil will degrade if it is mixed with a large amount of mineral oil.
• Use liquid refrigerant to fill the system.
- If gas refrigerant is used to seal the system, the composition of the refrigerant in
the cylinder will change and performance may drop.
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