Specifications
163
2.5.1 Installation of indoor unit
(1) Ceiling recessed type (FDT)
(a) Selection of installation location
1) Select location where the space above ceiling is larger than those men-
tioned below and perfect draining can be assured.
2) Places where perfect drainage can be prepared and sufficient drainage gra-
dient is available.
3)
Places free from air distrubances to the air inlet and outlet of the indoor unit.
4) Places with the environmental dew-point temperature is lower than 28˚C
and the relative humidity is less than 80%. (When installing at a place un-
der a high humidity environment, pay sufficient attention to prevention of
dewing such as thermally insulating the unit properly.)
5) Do not place where the unit is exposed to oil splashes or steam (e.g. kitch-
ens and machine plants). (Istallation and use at such places will causes the
performance drop, corrosion in the heat exchanger and damage in molded
synthetic resin parts.)
6) Do not place where corrosive gas (such as sulfurous acid gas) or inflam-
mable gas (thinner, gasoline, etc.) is generated or remains. Installation and
use at such places will cause corrosion in the heat exchanger and damage in
molded synthetic resin parts.
7) Do not place adjacent to equipment generating electromagnetic waves or high-frequency waves such as in hospitals,
Generated noise may cause malfunctioning of the controller.
(b) Preparation for installation
1) Ceiling hole size and Position of suspension bolts.
a)
The pattern sheet may shrink or expand as humid-
ity changes, so check the actual size before use.
b) The size of ceiling opening can be adjusted
within the range shown below. Bring the unit
body to the ceiling opening right in the center so
as not to be set aside and so that space between a
ceiling opening end and the outside of the unit
body becomes equal to that on the opposite side.
c) The size of the pattern sheet equals to the maxi-
mum size of the square ceiling opening.
2) Location of pipes
For the location of pipe, see the exterior dimension.
(c) Suspension
• Arrange four sets of a suspension bolt (M10 or M8), a nut
for it, a plain washer and a spring washer on site.
When there is the ceiling
1. Make an 860 to 890 mm-square cutout on the ceiling.
Refer to the outside dimensions of packing cardboard container.
sAlign the center of ceiling cutout and the center of unit.
2. Decide the hang bolt position (675780).
3. Use four hang bolts and fix them so that each bolt can
resist the pull out load of 50 kgf.
4. Decide the length of hang bolt to approx. 70 mm above
the ceiling surface.
5. After hanging in the unit, fix the attached level gauge and
secure the height of unit.
6. Use a transparent hose filled with water to check the lev-
elness of unit. (The maximum allowable height difference
between both ends of unit is 3 mm.)
Request
• For the hang bolt whose length exceeds 1.3m, use the M10
size hang bolt and moreover combine a diagonal member
to the hang bolt for reinfocement.
FDT28, 36, 45, 56, 71, 90
FDT112, 140
Model
Space above ceiling (h)
Over 270mm
Over 330mm
A
B
C
D
E
F
G
Gas refrigerant piping
Liquid refrigerant piping
Drain piping connecting hole
Power intake hole
Suspension bolt
Outside air intake hole
Supply air branch duct connecting hole
1‚000 or more
(mm)
Obstacle
1‚000 or more
400
420
267
310
E
B
A
C
D
332
840
637
422
95
45 or more
Lug
Drain hose
(accessory)
Attach on site.
Ceiling opening dimension : 860 to 890 square
Suspension bolt pitch : 780
Control box
137
167
30 b
a
Suspension bolt pitch : 675
F
G
Refrigerant piping
Drain
bolt
Suspension
Nut
Washer
Spring
Washer
Main
body
Level gauge
Indoor unit
Hose
10~25
40~45
Supply air grill
Adjust so that level gauge surface and
the lower surface of ceiling are in matching.
Fix the level gauge in alignment
with this face of supply air grill.
Ceiling
member
Level gauge (insulation)
• Installtation space
Model
a
210
270
260
320
b
FDT28, 36, 45,
56, 71, 90
FDT112, 140
Unit : mm