Install The Indoor Unit On A Ceiling Strong Enough To Sustain Its Weight; Securing Installation And Service Space; Combining Indoor Units With Outdoor Units; Fixing Hanging Bolts - Mitsubishi Electric PEH-P20MYA Installation Manual

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

• Select the optimum direction of supply airflow according to the configuration of
the room and the installation position.
• As the piping and wiring are connected at the bottom and side surfaces, and
the maintenance is made at the same surfaces, allow a proper space properly.
For the efficient suspension work and safety, provide a space as much as
possible.

4. Fixing hanging bolts

4.1. Fixing hanging bolts
(Use M10 hanging bolts. The bolts should be supplied in the field.)
(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.
1 Reinforcing the ceiling with additional members (edge beam, etc) must be re-
quired 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.
For wooden construction
• Use the tie beam (for one story building) or second-floor beam (for two story
building) as strength members.

5. Installing the unit

5.1. Hanging the unit body

s Bring the indoor unit to an installation site as it is packed.
s To hang the indoor unit, use a lifting machine to lift and pass through the
hanging bolts.
s Install the indoor unit before ceiling work.
[Fig. 5.1.1] (P.3)
A Unit body
* 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)
A Nut
When using inlet duct 100 or more
When not using inlet duct 0 or more
<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.
2. Adjust each suspension fixture bolt.
B Lifting machine
B Washer
A B
130 or more
30 or more
Nut (*1) is not required if distance A is 0.
Service space
[Fig. 3.2.1] (P.2)
1 When connecting air inlet
2 When installing the suspension fixtures prior to installation of the indoor unit with-
out inlet duct
3 When hanging the indoor unit directly without inlet duct
A Service space
C Air inlet
*1 When there is not 500mm of service space on top of the unit, there must be 700mm of
service space at the air outlet side.
Suspension bolt pitch
[Fig. 3.2.2] (P.2)
E Top of the unit F
G Control box H
3.3. Combining indoor units with outdoor
units
For combining indoor units with outdoor units, refer to the outdoor unit installation
manual.
• To hang the air-conditioner, use a hard square timber of more than 6 cm if the
distance between beams is less than 90 cm and a hard square timber of more
than 9 cm if the distance between beams is less than 180 cm.
[Fig. 4.1.1] (P.2)
A Ceiling board B Edge beam
D Square timber for hanging the air conditioner
For reinforced concrete construction
• As shown in the figure below, fix the hanging bolts, or use square timbers to fix
the hanging bolts.
[Fig. 4.1.2] (P.2)
F Insert: 100 to 150 kg (1 piece) (field supply)
G M10 hanging bolt (field supply)
Product Weight (kg)
PEH-P8MYA 70 kg
PEH-P10MYA 80 kg
PEH-P16MYA 180 kg
PEH-P20MYA 212 kg
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)
A 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
[Fig. 5.1.4] (P.3)
A Nut
5.2. Confirming the unit's position and fix-
ing hanging bolts
[Fig. 5.2.1] (P.3)
A Level check
s 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.
s Use a level to check that the surface indicated by A is at level. Ensure
that the hanging bolt nuts are tightened to fix the hanging bolts.
s 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.
B Suspension bolt pitch
D Air outlet
4-ø12 suspension bolt
I Main body
Drain pan
C Tie beam
E Pitch
H Reinforcement
A B
130 or more
55 or more
B Washer
13