Selecting An Installation Site; Installation And Servicing Space; Combining Indoor Units With Outdoor Units; Fixing Hanging Bolts - Mitsubishi Electric CITY MULTI PEFY-P-NMHSU-E Manuel D'installation

3. Selecting an installation site

• Select a location so that air can be blown into all corners of the room.
• Avoid locations exposed to outside air.
• Select a location free of obstructions to the airflow in and out of the unit.
• Avoid locations exposed to steam or oil vapour.
• Avoid locations where combustible gas may leak, settle or be generated.
• Avoid installation near machines emitting high-frequency waves (high-frequency
welders, etc.)
• Avoid locations where the airflow is directed at a fire alarm sensor. (Hot air
could trigger the alarm during the heating operation.)
• Avoid places where acidic solutions are frequently handled.
• Avoid places where sulphur-based or other sprays are frequently used.
• If the unit runs for long hours when the air above the ceiling is at high tempera-
ture/high humidity (dew point above 26 °C [79 °F]), dew condensation may be
produced in the indoor unit. When operating the units in this condition, add
insulation material (10-20 mm [7/16~13/16 in]) to the entire surface of the in-
door unit to avoid dew condensation.
Warning:
Install the indoor unit on a ceiling strong enough to sustain its weight.
If the ceiling lacks strength, it may cause the unit to fall down, resulting in an
injury.

4. Fixing hanging bolts

4.1. Fixing hanging bolts
(Give site of suspension strong structure.)
Hanging structure
• Ceiling: The ceiling structure varies from one building to another. For detailed
information, consult your construction company.
• 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 vibrating.
2 Cut and remove the ceiling members.
3 Reinforce the ceiling members, and add other members for fixing the ceiling
boards.
Center of gravity and Product Weight
Model name W
PEFY-P72NMHSU-E 1034 [40-3/4]
PEFY-P96NMHSU-E 1034 [40-3/4]

5. Installing the unit

5.1. Hanging the unit body

s s s s s Bring the indoor unit to an installation site as it is packed.
s s s s s To hang the indoor unit, use a lifting machine to lift and pass through the
hanging bolts.
s s s s s Install the indoor unit before ceiling joist construction.
[Fig. 5.1.1] (P. 2)
A Unit body
B Lifting machine
[Fig. 5.1.2] (P. 2)
C Nuts (field supply)
D Washers (with cushion)
E Washers (without cushion)
F M10 Hanging bolt (field supply)
L H
1326 [52-1/4] 255 [10-1/16]
1326 [52-1/4] 255 [10-1/16]

3.1. Installation and servicing space

Note:
Always install access doors in the specified positions for service mainte-
nance.
Warning:
Install the unit on a ceiling strong enough to support its weight.
• If the unit is mounted on a structure of insufficient strength it may fall
causing injury.
[Fig. 3.1.1] (P. 2)
A Duct dimension
C Air inlet
E Servicing space
G Hanging bolt spacing
I More than 100 [3-15/16 in]
K Keep the service space for the maintenance from the bottom when the fan motor
changed.
L Keep the service space for the maintenance from the bottom when the heat ex-
changer cleaned.
3.2. Combining indoor units with outdoor
units
For combining indoor units with outdoor units, refer to the outdoor unit installation
manual.
[Fig. 4.1.1] (P.2)
A Center of gravity
X Y
462 [18-1/4] 660 [26]
462 [18-1/4] 660 [26]
5.2. Confirming the unit's position and
fixing hanging bolts
s s s s s Use the gauge 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 s s s s Use a level to check that the surface indicated by A A A A A is at level. Ensure
that the hanging bolt nuts are tightened to fix the hanging bolts.
s s s s s To ensure that drain is discharged, be sure to hang the unit at level using
a level.
[Fig. 5.2.1] (P. 2)
A Bottom of indoor unit
Caution:
Be sure to install the unit body at level.
B Electrical components case
D Access door
F Air outlet
H Ceiling
J More than 20 [13/16 in]
(mm)[in] (kg)[lb]
Prodact Weight
Z
235 [9-5/16] 97 [214]
235 [9-5/16] 100 [221]
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