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• Install the air conditioner securely in a location where the base can sustain the weight of the unit
adequately.
• Perform the specified installation work to guard against an earthquake.
If the air conditioner is not installed appropriately, accidents may occur due to the unit falling.
• If refrigerant gas has leaked during the installation work, ventilate the room immediately.
If the leaked refrigerant gas comes in contact with fire, noxious gases may be generated.
• After the installation work, confirm that refrigerant gas does not leak.
If refrigerant gas leaks into the room and flows near a fire source, such as a cooking range, noxious gases may be
generated.
• Electrical work must be performed by a qualified electrician in accordance with the Installation
Manual. Ensure the power supply to the air conditioner is exclusive to that unit only.
An insufficient power supply capacity or inappropriate installation may cause fire.
• Use only the specified wiring during the unit installation. Ensure that all terminals are securely fixed,
so preventing any external forces having a negative effect on the terminals.
• Conform to the regulations of the local electric authority when wiring the power supply.
Inappropriate grounding may cause an electric shock.
• Do not install the air conditioner in a location that may be subjected to a risk of exposure to a
combustible gas.
If a combustible gas leaks and becomes concentrated around the unit, a fire may occur.
2
SELECTION OF INSTALLATION PLACE
WARNING
• The air conditioner must be installed in a location that can support the weight of the unit effectively.
If the unit is not installed on a foundation that can support its weight effectively, the unit may fall down, resulting in
possible human injury.
• Where required ensure that the units installation is sufficient enough to withstand against an earthquake.
An insufficient installation could result in the unit falling, causing possible human injury.
• Install the air conditioner at a minimum height of 2.5 m from the floor.
Do not insert your hands or others into the unit while the air conditioner is operating.
CAUTION
Upon approval from the customer, install the air conditioner in a place that satisfies the following
conditions.
• A place where the unit can be installed horizontally.
• A place where a sufficient servicing space can be maintained for safety maintenance and unit check.
• A place where the drain water can be exited from the unit, without causing a problem.
Avoid installing in the following places.
• Places exposed to air with a high salt content (seaside area), or places exposed to large quantities of sulfide gas
(hot spring). (Should the unit be used in these places, special protective measures are needed.)
• Places exposed to oil, vapor, oil smoke or corrosive gas.
• Places where organic solvent is used nearby.
• Places close to a machine generating high frequency.
• Places where the discharged air blows directly into the window of the neighbouring house. (For outdoor unit)
• Places where the noise from the outdoor unit can be easily transmitted to the neighboring property.
(When installing the air conditioner on the boundary with a neighbor, pay due attention to the level of noise.)
• Places with poor ventilation.
1
PRECAUTIONS FOR SAFETY
Installation space
Ensure there is sufficient space to install the unit and to perform maintenance work as and when required.
Keep 15mm or more for clearance between top plate of the indoor unit and the ceiling surface.
Installation space
1000
or more
15 or more
15 or more
1000 or more
Obstacle
283
or more
283
or more
1000 or more
Ceiling height
When the ceiling height exceeds the standard distance of a 4-way air discharge cassette as detailed in the following
table. The air-flow may not be sufficient to heat the room. It is therefore necessary to set the unit to high ceiling
mode or adjust the direction of the ceiling discharge.
For setup of the high ceiling mode, refer to the details of Applicable controls “To incorporate a filter sold separately”
and “In case of installation to high ceiling” within this Manual.
Installable ceiling height list
(Unit: m)
REQUIREMENT
• When high ceiling (1) or (3) is used with 4-way blowing, a draft is easily recognized due to drop of discharge
temperature.
The air filter cleaning signal duration (Notification of filter cleaning) on the remote controller can be changed
according to the condition of installation.
If the room is not heated due to the installation place or construction of the room, the detection temperature of
heating can be raised.
For setup method, refer to “Change of lighting term of filter sign” and “Increased heating effect” in the Applicable
controls of this Manual.
Model MMU-AP
0071 to 0121 type
0151 to 0181 type
Installable ceiling height
Up to 2.7 m
Up to 3.5 m
Indoor unit capacity type
Discharge direction
Standard (At shipment)
High ceiling (2)
High ceiling (3)
0071 to 0121 type 0151 type 0181 type
4-way 3-way 2-way 4-way 3-way 2-way 4-way 3-way 2-way
2.7 ——2.9 ——3.2 ——
———3.2 ——3.4 ——
———3.5 ——3.5 ——
Setup of high ceiling
Setup data
0000
0002
0003