Mitsubishi Electric CITY MULTI PUHY-400YMF-B, Service Handbook, Page: 3 / 204

Safety precautions
Before installation and electric work
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Before installing the unit, make sure you read all
the “Safety precautions”.
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The “Safety precautions” provide very important
points regarding safety. Make sure you follow them.
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This equipment may not be applicable to EN61000-
3-2: 1995 and EN61000-3-3: 1995.
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This equipment may have an adverse effect on
equipment on the same electrical supply system.
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Please report to or take consent by the supply au-
thority before connection to the system.
Symbols used in the text
Warning:
Describes precautions that should be observed to pre-
vent danger of injury or death to the user.
Caution:
Describes precautions that should be observed to pre-
vent 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>
: Indicates that the main switch must be turned off before ser-
vicing. (This symbol is displayed on the main unit label.) <Color:
Blue>
: Beware of electric shock (This symbol is displayed on the main
unit label.) <Color: Yellow>
: Beware of hot surface (This symbol is displayed on the main
unit label.) <Color: Yellow>
: Please pay attention to electric shock fully because
this is not Safety Extra Low-Voltage (SELV) circuit.
And at servicing, please shut down the power supply
for both of Indoor Unit and Outdoor Unit.
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 earth-
quakes 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.
• If refrigerant gas leaks during installation work, ventilate the
room.
- If the refrigerant gas comes into contact with a flame, poison-
ous 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 accord-
ing to “Electric Facility Engineering Standard” and “Interior
Wire Regulations”and the instructions given in this manual
and always use a special circuit.
- 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 and the panel.
- If the cover and panel are not installed properly, dust or water
may enter the outdoor unit and fire or electric shock may re-
sult.
• When installing and moving the air conditioner to another
site, do not charge the it with a refrigerant different from the
refrigerant (R22/R407C) specified on the unit.
- If a different refrigerant or air is mixed with the original refriger-
ant, 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 pre-
vent the safety limit from being exceeded. Should the refriger-
ant 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, elec-
tric shock, or fire may result.
• After completing installation work, make sure that refriger-
ant 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 de-
vice is shorted and operated forcibly, or parts other than those
specified by Mitsubishi Electric are used, fire or explosion may
result.
ELV