Table Of Contents; Safety Precautions; Before Installation And Electric Work; Precautions For Devices That Use R410A Refrigerant - Mitsubishi Electric CITY MULTI 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 .................... 2
1.3. Before installation ........................................................................ 3
1.4. Before installation (relocation) - electrical work ........................... 3
1.5. Before starting the test run .......................................................... 3
2. Items to be used ........................................................................................... 3
2.1. Package contents ........................................................................ 3
2.2. Commercially available items ...................................................... 3
3. Selecting an installation site ......................................................................... 4
3.1. About the product ........................................................................ 4
3.2. Installation site ............................................................................ 4
3.3. Securing installation and service space ...................................... 4
3.4. Checking the installation site ....................................................... 5

1. Safety precautions

1.1. Before installation and electric work

u Before installing the unit, make sure you read all the "Safety
precautions".
u The "Safety precautions" provide very important points
regarding 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 la-
bel.) <Color: Yellow>
Warning:
Carefully read the labels affixed to the main 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.
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 earthquakes and install the unit at the specified place.
- Improper installation may cause the unit to fall down and result in injury
and damage to the unit.
• Always use accessories specified by Mitsubishi Electric.
- Ask an authorized technician to install the accessories. Improper installa-
tion 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 quali-
fied Refrigeration Engineer.
- If the unit is repaired improperly, water leakage, electric shock, or fire may
result.
• 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.
2
4. Installing BC controller ................................................................................. 8
4.1. Installing BC controllers .............................................................. 8
5. Connecting refrigerant pipes and drain pipes............................................... 8
5.1. Pipe connecting method .............................................................. 8
5.2. Connecting refrigerant pipes ....................................................... 9
5.3. Refrigerant piping work ............................................................. 10
5.4. Insulating refrigerant pipes ........................................................ 11
5.5. Drain piping work ...................................................................... 11
6. Electrical work ............................................................................................ 11
7. Setting addresses and operating units ....................................................... 12
8. Checklist after installation ........................................................................... 12
9. Test run ....................................................................................................... 12
10. Important information to be passed on to the end users ............................ 12
• Have all electric work done by a licensed electrician according to "Elec-
tric 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
improperly, electric shock and fire may result.
• Securely install the cover of control box.
- If the cover 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 re-
frigerant cycle may malfunction and the unit may be damaged.
• If the air conditioner is installed in a small room, measures must be tak-
en 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 Elec-
tric 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 basement, etc.
where refrigeration gas can accumulate, since refrigerant is heavier
than the air.
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
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 refrig-
erant residual oil to deteriorate.