Installation Of Indoor Unit; Selection Of Installation Location; Installation Space For Unit - Mitsubishi Heavy Industries FDCA Series Technical Manual

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 mentioned
right side and perfect draining can be assured.
2) With the customer's consent, select a location with following suitable condi-
tions.
a) Where cool air or hot air can easily pass through.
If the height of the location exceeds 3 m, hot air will gather in the ceiling. Suggest to the customer to also install a
circulator.
b) Where water can be completely drained. A sloping location for drainage.
c) Where there are no wind disturbances to the suction inlet and blowing outlet, where the fire alarm will not be set off
erroneously, where no short circuits occur.
d) Where there is no direct sunlight.
e) Where the dew point temperature is below 28°C and the relative humidity is below 80%.
( The unit has been tested according to JIS dew point conditions and has been confirmed to operate without
any problems. However, if the unit is operated in an environment with the humidity higher than the above
limit, water condensation may occur. Accordingly, all pipes and drain pipes should be further covered with
insulation materials of 10 - 20 mm thick.
3) Consider the supporting strength of the location. If the strength is not sufficient to sustain the unit weight, use reinforcing
materials.
(b) Installation space for unit
a) When a sufficient interval cannot be secured between the unit and a wall
or another unit, shut up diffusers on that side to block winds and make
sure that no short-circuiting is occurring. (A wind blocking material is
available as an optional part)
• Do not use the unit in the "Lo" wind mode when winds are blown into
two or three directions.
b) When the unit has 2500 mm or less clearance, attach a fan guard (option
part) on the intake side of the fan.
Drain hose
(Accessories)
(Local setting)
(Ceiling hole size)
860~890
(Suspension bolts pitch)
780
267
332 310
840
B
C
A
Lug for
suspension bolts
Control box
D
84
-
FDT151, 201, 251, 301
FDT401
FDT501
Control box
A Gas tube connecting port
B Liquid tube connecting port
C Drain line connecting port
D Power intake
E Hanging bolt
E
FDT151, 201, 251, 301
-
Model Space above ceiling (h)
Over 290mm
Over 315mm
Over 385mm
• Installation space
1‚000 or more
Obstacle
Model a b
212 270
FDT401 212 295
FDT501 269 365
)
(mm)