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3. Selecting an installation site & Accessories
• Select a site with sturdy fixed surface sufficiently durable against the weight of unit.
• Before installing unit, the routing to carry in unit to the installation site should be
determined.
• Select a site where the unit is not affected by entering air.
• Select a site where the flow of supply and return air is not blocked.
• Select a site where refrigerant piping can easily be led to the outside.
• Select a site which allows the supply air to be distributed fully in room.
• Do not install unit at a site with oil splashing or steam in much quantity.
• Do not install unit at a site where combustible gas may generate, flow in, stagnate
or leak.
• Do not install unit at a site where equipment generating high frequency waves (a
high frequency wave welder for example) is provided.
• Do not install unit at a site where fire detector is located at the supply air side. (Fire
detector may operate erroneously due to the heated air supplied during heating
operation.)
• When special chemical product may scatter around such as site chemical plants
and hospitals, full investigation is required before installing unit. (The plastic
components may be damaged depending on the chemical product applied.)
• If the unit is run for long hours when the air above the ceiling is at high
temperature/high humidity (due point above 26 °C), due condensation may
be produced in the indoor unit. When operating the units in this condition, add
insulation material (10-20 mm) to the entire surface of the indoor unit to avoid
due condensation.
3.1. Install the indoor unit on a ceiling strong enough
to sustain its weight
Warning:
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 causing
injuries.
3.2. Securing installation and service space
Secure enough access space to allow for the maintenance, inspection, and
replacement of the motor, fan, drain pump, heat exchanger, and electric box in one
of the following ways.
Select an installation site for the indoor unit so that its maintenance access space will
4. Fixing hanging bolts
4.1. Fixing hanging bolts
[Fig. 4-1] (P.3)
Ⓐ Center of gravity
(Give site of suspension strong structure.)
Hanging structure
• Ceiling: The ceiling structure varies from building to one another. For detailed
information, consult your construction company.
5. Installing the unit
5.1. Hanging the unit body
Bring the indoor unit to an installation site as it is packed.
To hang the indoor unit, use a lifting machine to lift and pass through the
hanging bolts.
[Fig. 5-1-1] (P.3)
Ⓐ Unit body
Ⓑ Lifting machine
* Two installation methods are available
<When hanging the indoor unit directly>
1. Attach a washer and nut(s) to each suspension bolt. (The washers and nuts
are to be supplied locally.)
2. Fit the indoor unit to each suspension bolt.
3. Make sure that the unit is positioned level, then tighten each nut.
[Fig. 5-1-2] (P.3)
Ⓐ Nut
When using inlet duct
100 or more
When not using inlet duct
<When installing the suspension fixture prior to installation of the indoor unit>
1. Loosen each suspension fixture bolt slightly, and remove the fixture and
U-shaped washers.
14
Ⓑ Washer
(Unit: mm)
A
B
130 or more
0 or more
30 or more
Nut (*1) is not required if distance A is 0 mm.
not be obstructed by beams or other objects.
[Maintenance access space]
Secure enough access space to allow for the maintenance, inspection, and
replacement of the motor, fan, drain pan, heat exchanger, and electric box in one of
the following ways.
Select an installation site for the indoor unit so that its maintenance access space
will not be obstructed by beams or other objects.
(1) When a space of 500mm or more is available below the unit between the unit
and the ceiling. [Fig. 3-2-1][Fig. 3-2-2]
• Create access door 1 and 2 (450x450 mm each) as shown in [Fig. 3-2-3].
(Access door 2 is not required if enough space is available below the unit for
a maintenance worker to work in.)
• An access hole of the same size as the access door 3 as shown in [Fig. 3-2-6]
is required to access drain pan or heat exchanger for replacement.
(Required only when the ceiling material cannot be removed.)
(2) When a space of less than 500mm is available below the unit between the unit
and the ceiling.
(At least 300 mm of space should be left below the unit as shown in [Fig. 3-2-4]
[Fig. 3-2-5].)
• Create access door 3 below the electric box and the unit as shown in [Fig. 3-2-6].
[Fig. 3-2-1] (P.2)
[Fig. 3-2-2] (P.2)
[Fig. 3-2-3] (P.2)
[Fig. 3-2-4] (P.2)
[Fig. 3-2-5] (P.2)
[Fig. 3-2-6] (P.2)
3.3. Indoor unit accessories
The unit is provided with the following accessories:
No.
Name
Pipe cover (for refrigerant piping joint) Small diameter
①
②
Pipe cover (for refrigerant piping joint) Large diameter
• If necessary, reinforce the hanging bolts with anti-quake supporting members as
countermeasures against earthquakes.
* Use M10 for hanging bolts and anti-quake supporting members (field supply).
① Reinforcing the ceiling with additional members (edge beam, etc.) must be
required to keep the ceiling at level and to prevent the ceiling from vibrations.
② Cut and remove the ceiling members.
③ Reinforce the ceiling members, and add other members for fixing the ceiling boards.
2. Adjust each suspension fixture bolt.
3. Attach a washer, nut and suspension fixture to each suspension bolt. (The
washers and nuts are to be supplied locally.)
4. Hook the indoor unit to the suspension fixtures.
5. Make sure that the unit is positioned level, then tighten each nut.
[Fig. 5-1-3] (P.3)
Ⓐ Be sure to attach a U-shaped washer (4 washers in total).
When using inlet duct
100 or more
When not using inlet duct
25 or more
5.2. Confirming the unit's position and fixing hanging
bolts
Use the gage supplied with the panel to confirm that the unit body
and hanging bolts are positioned in place. If they are not positioned in
place, it may result in dew drops due to wind leak. Be sure to check the
positional relationship.
Install the unit horizontally, using a level. Ensure that the hanging bolt
nuts are tightened to fix the hanging bolts.
To ensure that drain is discharged, be sure to hang the unit at level using
a level.
Caution:
Be sure to install the unit body at level.
Quantity
1
1
(Unit: mm)
A
B
130 or more
55 or more
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