Mitsubishi Electric FDT125VNVF Technical Manual page 213

① Before installation
l Install correctly according to the installation manual.
l Confirm the following points:
 Unit type/Power supply specification  Pipes/Wires/Small parts
Accessory itme
For unit hanging For refrigerant pipe
Flat washer Level gauge Pipe cover
Pipe cover(big)
(M10) (Insulation) (small)
8 4 1 1
For adjustment For heat For heat
For pipe cover
For unit hanging in hoisting in the insulation insulation
fixing
unit's main body of gas pipe of liquid tube
②
Selection of installation location for the indoor unit
j Select the suitable areas to install the unit under approval of the user.
ž Areas where the indoor unit can deliver hot and cold wind sufficiently. Suggest to the user to use
a circulator if the ceiling height is over 3m to avoid warm air being accumulated on the ceiling.
ž Areas where there is enough space to install and service.
ž Areas where it can be drained properly. Areas where drain pipe descending slope can be taken.
ž Areas where there is no obstruction of airflow on both air return grille and air supply port.
ž Areas where fire alarm will not be accidentally activated by the air conditioner.
ž Areas where the supply air does not short-circuit.
ž Areas where it is not influenced by draft air.
ž Areas not exposed to direct sunlight.
ž Areas where dew point is lower than around 28°C and relative humidity is lower than 80%.
This indoor unit is tested under the condition of JIS (Japan Industrial Standard) high humidity
condition and confirmed there is no problem. However, there is some risk of condensation drop
if the air conditioner is operated under the severer condition than mentioned above.
If there is a possibility to use it under such a condition, attach additional insulation of 10 to
20mm thick for entire surface of indoor unit, refrigeration pipe and drain pipe.
ž Areas where TV and radio stays away more than 1m. (It could cause jamming and noise.)
ž Areas where any items which will be damaged by getting wet are not placed such as food, table
wares, server, or medical equipment under the unit.
ž Areas where there is no influence by the heat which cookware generates.
ž Areas where not exposed to oil mist, powder and/or steam directly such as above fryer.
ž Areas where lighting device such as fluorescent light or incandescent light doesn't affect the
operation.
(A beam from lighting device sometimes affects the infrared receiver for the wireless remote
controller and the air conditioner might not work properly.)
k Check if the place where the air conditioner is installed can hold the weight of the unit. If it is not
able to hold, reinforce the structure with boards and beams strong enough to hold it. If the strength
is not enough, it could cause injury due to unit falling.
l If there are 2 units of wireless type, keep them away for more than 5m to avoid malfunction due to
cross communication.
m When plural indoor units are installed nearby, keep them away for more than 4m.
Space for installation and service
l When it is not possible to keep enough space between indoor unit and wall or between indoor units,
close the air supply port where it is not possible to keep space and confirm there is no short circuit
of airflow.
l Install the indoor unit at a height of more than 2.5m above the floor.
4000mm or more
I d n o o u r t i n
Ceiling
surface
Wall
1000mm or more
Decorative panel
1000mm or more
Obstacle
 Accessory items
For draom pipe
Strap Pipe cover(big) Pipe cover(small) Drain hose Hose clamp
4 1 1 1
For heat For heat
For drain pipe For drain hose
insulation insulation
connecting mounting
of drain socket of drain socket
I d n o o u r t i n
2500mm or more
Floor
③ Preparation before installation
l If suspension bolt becomes longer, do reinforcement of earthquake resistant.
 For grid ceiling
When suspension bolt length is over 500mm, or the gap between the ceiling and roof is over
700mm, apply earthquake resistant brace to the bolt.
 In case the unit is hanged directly from the slab and is installed on the ceiling plane which has
enough strength.
When suspension bolt length is over 1000mm, apply the earthquake resistant brace to the bolt.
l Prepare four (4) sets of suspension bolt, nut and spring washer (M10 or M8) on site.
Ceiling opening, Suspension bolts pitch, Pipe position
1
530 (Suspension bolts pitch)
F
Control
box
185
190 223
Drain hose piece
(Accessory)
(Installed on site)
□570
325
C
A B
145
Hanger plate for
suspension bolt
④
Installation of indoor unit
Work procedure
1. This units is designed for 2 x 2 grid ceiling.
If necessary, please detach the T bar temporarily before you install it.
If it is installed on a ceiling other than 2 x 2 grid ceiling, provide an inspection port on the control box
side.
2. Arrange the suspension bolt at the right position (530mm×530mm).
3. Make sure to use four suspension bolts and fix them so as to be able to hold 500N load.
4. Ensure that the lower end of the suspension bolt should be 45mm above the ceiling plane.
Temporarily put the four lower nuts 88mm above the ceiling plane and the upper nuts on distant
place from the lower nuts in order not to obstruct hanging the indoor unit or adjust the indoor unit
position, and then hang the indoor unit.
Control box
T bar Ceiling
panel
5. Adjust the indoor unit position after hanging it by inserting the level gauge attached on the package
into the air supply port and checking if the gap between the ceiling plane and the indoor unit is
appropriate. In order to adjust the indoor unit position, adjust the lower nuts while the upper nuts are
put on distant place. Confirm there is no backlash between the hanger plate for suspension bolt and
the lower nut and washer.
Drain piping
Refrigerant piping
Level gauge
Use level gauges as
reference, adjust the
bottom to the face of
the indoor unit.
T-bar
Ceiling panel
Correct
Unit
Unit
Touch the nut (lower) and Play is left between the fixture
washer without any play and the nut (lower) and washer.
212
- -
'12 • PAC-T-174
F Decorative panel
F
Air return
Air supply grille
D
□413
21
□700
200 48
140 6-φ4
60 Holes for
E
tapping screws
Hole
100
F
Suspension bolt
Nut (upper)
Flat washer
Spring washer
Nut (lower)
88mm
45mm
Ceiling surface
Use level gauges as
reference, adjust the
bottom to the face of
the indoor unit.
Diffuser
Level gauge
T-bar
Ceiling panel
(insulation)
When the ceiling panel comes below the T
bar, align the bottom of the level gauge to
the lower face of the ceiling panel.
Wrong
Symbol Content
A Gas piping
Liquid piping
B
Drain piping
C
D Hole for wiring
Suspension bolts
E
Air outlet opening
F
for ducting
Diffuser
Level gauge
(insulation)