30
11.1.2 Installation of Indoor Unit
This air conditioner uses a drain up motor.
Horizontally install the unit using a level gauge.
CEILING OPENING DIMENSIONS AND
HANGING
BOLT LOCATION
The paper model for installation expand or shrink
according to temperature and humidity.
Check on dimensions before using it.
Caution
During the installation, care must be taken
not to damage electric wires.
The dimensions of the paper model for installation
are the same as those of the ceiling opening
dimensions.
Be sure to discuss the ceiling drilling work with the
workers concerned.
POSITIONS OF AIR CONDITIONER BODY AND CEILING SURFACE
11.1.3 Refrigerant
Piping
Refrigerant is charged to the outdoor unit. For details, see the manual for installation work of outdoor unit.
(Additional charging, etc.)
1 Brazing for piping.
a. Execute brazing before tightening the flare
nut.
b. Brazing must be executed while blowing
nitrogen gas. (This prevents generation of
oxidized scale in copper pipe.)
2 When there is a lot of brazings for long piping,
install a strainer midway of the piping. (The
strainer is locally supplied.)
3 Use clean copper pipe with inner wall surface
free from mist and dust. Blow nitrogen gas or
air to blow off dust in the pipe before
connection.
4 Form the piping according to its routing. Avoid
bending and bending back the same piping
point more than three times. (This will result in
hardening of the pipe).
5 After deforming the pipe, align centers of the
union fitting of the indoor unit and the piping,
and tighten them firmly with wrenches.
6 Connect pipe to the service valve or ball valve
which is located below the outdoor unit.
7 After completed the piping connection, be sure to check if there is gas leakage in indoor and outdoor
connection.
Drain pipe
25
9
/
16
"
(650) (Ceiling opening)
(Hanging bolt)
(Unit: inch (mm))
25
9
/
16
"
(6
50)
(C
e
ili
ng
open
ing)
20
7
/
8
"
(53
0
)
(H
ang
ing
bol
t)
22
13
/
16
"
(5
80
)
(U
nit
s
iz
e
)
22
13
/
16
"
(580)
(Unit size)
Refrigerant pipe
20
7
/
8
"
(530)
2
3
/
8
"
(60)
2
3
/
8
"
(60)
2
3
/
8
"
(60)
2
3
/
8
"
(60)
Hanging bolt
(W3/8 or M10)
Keep the length of the bolt from
the bracket to 1
9
/
16
"
(40 mm)
Flat washer for M10
(accessory)
Nut
(W3/8 or M10)
M10 Spring washer
Air conditioner body
Ceiling
4
7
/
16
"
(1
13
m
m
)
11
1
/
8
"
(2
82
m
m
)
11
1
/
2
"
(29
2
mm)
a
n
d
a
b
ov
e
Adjust to the same height
Nut
(W3/8 or M10)
Paper model
for installation
Set screw for paper
model (4 pieces)
Open the ceiling board along the
outer edge of the paper model.
Flat washer for M10
(accessory)
Warning
Tighten the nut and bolt to prevent unit from falling
•
Con• rm the red mark of the union (thin side)
is always at lower direction after connecting
piping.
Union
Red mark
