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HOW TO INSTALL THE INDOOR UNIT
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4-Way Cassette Type (U1 Type)
Preparation for Suspending
This unit uses a drain pump. Use a carpenter’s level to check
that the unit is level.
Suspending the Indoor Unit
(1) Fix the suspension bolts securely in the ceiling using
the method shown in the diagrams, by attaching them
to the ceiling support structure, or by any other method
that ensures that the unit will be securely and safely
suspended.
(2) Follow the diagram, Indoor Unit View from top and Table
below to make the holes in the ceiling.
Table Unit: mm
Length
Type
AB C D
60, 71, 100, 125,
140
786 745 860 to 910 860 to 910
(3) Determine the pitch of the suspension bolts using the
supplied full-scale installation diagram. The diagram and
table below show the relationship between the positions
of the suspension fitting, unit, and panel.
Use the nut (field supply) and washer (supplied) for
upper and lower position of the suspension lug.
Hole-in-anchor
Hole-in-plug
Concrete
Insert
Suspension bolt (M10 or 3/8")
(field supply)
Note: For DC Fan Tap Change Procedure for 4-Way
Cassette, see Others.
Indoor Unit
View from top
B (suspension bolt pitch)
A (suspension bolt pitch)
C (ceiling opening dimension)
D (ceiling opening dimension)
SELECTING THE INSTALLATION SITE (U1 Type)
Indoor Unit
AVOID:
● areas where leakage of flammable gas may be expected.
● places where large amounts of oil mist exist.
● direct sunlight.
● locations near heat sources which may affect the
performance of the unit.
● locations where external air may enter the room directly.
This may cause “condensation” on the air discharge ports,
causing them to spray or drip water.
● locations where the remote controller will be splashed with
water or affected by dampness or humidity.
● installing the remote controller behind curtains or furniture.
● locations where high-frequency emissions are generated.
DO:
● select an appropriate position from which every corner of the
room can be uniformly cooled.
● select a location where the ceiling is strong enough to
support the weight of the unit.
● select a location where tubing and drain pipe have the
shortest run to the outdoor unit.
● allow room for operation and maintenance as well as
unrestricted air flow around the unit.
● install the unit within the maximum elevation difference
above or below the outdoor unit and within a total tubing
length (L) from the outdoor unit as detailed in the installation
manual packed with the outdoor unit.
● allow room for mounting the remote controller about 1 m off
the floor, in an area that is not in direct sunlight or in the flow
of cool air from the indoor unit.
1 m
1 m
1 m
1 m
1 m
4-Way Cassette Type
Wall
indoor unit indoor unit
min. 1 m
min. 1 m
min. 3 m
Obstacles
Ceiling
Sec1.indb52Sec1.indb52 2012/03/0717:30:032012/03/0717:30:03
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