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Contents
1. Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Installation location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Installing the outdoor unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Installing the refrigerant piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Drainage piping work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6. Electrical work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7. Test run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8. Special Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
9. System control (Fig. 9-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1. Safety precautions
► Before installing the unit, make sure you read all the “Safety precau-
tions”.
► Please report to or take consent by the supply authority before connec-
tion to the system.
After installation work has been completed, explain the “Safety Precautions,”
use,and maintenance of the unit to the customer according to the information in the
Operation Manual and perform the test run to ensure normal operation. Both the
Installation Manual and Operation Manual must be given to the user for keeping.
These manuals must be passed on to subsequent users.
: Indicates a part which must be grounded.
Warning:
Carefully read the labels affi xed to the main unit.
Warning:
• The unit must not be installed by the user. Ask a dealer or an authorized
technician to install the unit. If the unit is installed incorrectly, water
leakage,electric shock, or fi re may result.
• For installation work, follow the instructions in the Installation Manual and
use tools and pipe components specifi cally made for use with R410A re-
frigerant. The R410A refrigerant in the HFC system is pressurized 1.6 times
the pressure of usual refrigerants. If pipe components not designed for
R410A refrigerant are used and the unit is not installed correctly, the pipes
may burst and cause damage or injuries. In addition, water leakage, electric
shock, or fi re may result.
• The unit must be installed according to the instructions in order to mini-
mize the risk of damage from earthquakes, typhoons, or strong winds. An
incorrectly installed unit may fall down and cause damage or injuries.
• The unit must be securely installed on a structure that can sustain its
weight. If the unit is mounted on an unstable structure, it may fall down and
cause damage or injuries.
• If the air conditioner is installed in a small room, measures must be taken
to prevent the refrigerant concentration in the room from exceeding the
safety limit in the event of refrigerant leakage. Consult a dealer regarding
the appropriate measures to prevent the allowable concentration from be-
ing exceeded. Should the refrigerant leak and cause the concentration limit
to be exceeded, hazards due to lack of oxygen in the room may result.
• Ventilate the room if refrigerant leaks during operation. If refrigerant comes
into contact with a fl ame, poisonous gases will be released.
• All electric work must be performed by a qualifi ed technician according to
local regulations and the instructions given in this manual. The units must
be powered by dedicated power lines and the correct voltage and circuit
breakers must be used. Power lines with insuffi cient capacity or incorrect
electrical work may result in electric shock or fi re.
• Use C1220 copper phosphorus, for copper and copper alloy seamless
pipes, to connect the refrigerant pipes. If the pipes are not connected cor-
rectly, the unit will not be properly grounded and electric shock may result.
• Use only specified cables for wiring. The connections must be made se-
curely without tension on the terminals. If the cables are connected or in-
stalled incorrectly, overheating or fi re may result.
• The terminal block cover panel of the outdoor unit must be fi rmly attached.
If the cover panel is mounted incorrectly and dust and moisture enter the
unit, electric shock or fi re may result.
• When installing or moving the air conditioner, use only the specifi ed refrig-
erant (R410A) to charge the refrigerant lines. Do not mix it with any other
refrigerant and do not allow air to remain in the lines. Air enclosed in the
lines can cause pressure peaks resulting in a rupture and other hazards.
• Use only accessories authorized by Mitsubishi Electric and ask a dealer or
an authorized technician to install them. If accessories are incorrectly in-
stalled, water leakage, electric shock, or fi re may result.
• Do not alter the unit. Consult a dealer for repairs. If alterations or repairs are
not performed correctly, water leakage, electric shock, or fi re may result.
• The user should never attempt to repair the unit or transfer it to another
location. If the unit is installed incorrectly, water leakage, electric shock,
or fi re may result. If the air conditioner must be repaired or moved, ask a
dealer or an authorized technician.
• After installation has been completed, check for refrigerant leaks. If refrig-
erant leaks into the room and comes into contact with the fl ame of a heater
or portable cooking range, poisonous gases will be released.
1.1. Before installation
Caution:
• Do not use the unit in an unusual environment. If the air conditioner is
installed in areas exposed to steam, volatile oil (including machine oil), or
sulfuric gas, areas exposed to high salt content such as the seaside, or
areas where the unit will be covered by snow, the performance can be sig-
nifi cantly reduced and the internal parts can be damaged.
• Do not install the unit where combustible gases may leak, be produced,
fl ow, or accumulate. If combustible gas accumulates around the unit, fi re or
explosion may result.
• The outdoor unit produces condensation during the heating operation.
Make sure to provide drainage around the outdoor unit if such condensa-
tion is likely to cause damage.
Warning:
Describes precautions that must be observed to prevent danger of injury or
death to the user.
Caution:
Describes precautions that must be observed to prevent damage to the unit.
• When installing the unit in a hospital or communications offi ce, be prepared
for noise and electronic interference. Inverters, home appliances, high-
frequency medical equipment, and radio communications equipment can
cause the air conditioner to malfunction or breakdown. The air conditioner
may also affect medical equipment, disturbing medical care, and communi-
cations equipment, harming the screen display quality.
1.2. Before installation (relocation)
Caution:
• Be extremely careful when transporting the units. 2 or more persons are
needed to handle the unit, as it weighs 20 kg, 44 Ibs or more. Do not grasp
the packaging bands. Wear protective gloves to remove the unit from the
packaging and to move it, as you can injure your hands on the fi ns or the
edge of other parts.
• Be sure to safely dispose of the packaging materials. Packaging materials,
such as nails and other metal or wooden parts may cause stabs or other
injuries.
• The base and attachments of the outdoor unit must be periodically
checked for looseness, cracks or other damage. If such defects are left
uncorrected,the unit may fall down and cause damage or injuries.
• Do not clean the air conditioner unit with water. Electric shock may result.
• Tighten all fl are nuts to specifi cation using a torque wrench. If tightened too
much, the fl are nut can break after an extended period and refrigerant can
leak out.