Mitsubishi Electric FDT125VNVF Technical Manual page 206

①Before installation
●Install correctly according to the installation manual.
●Confirm the following points:
○Unit type/Power supply specification
Accessory item
For unit hanging For refrigerant pipe
Flat washer (M10) Level gauge Pipe cover(big) Pipe cover (small)
8 1 1 1
For unit hanging For heat insulation
For heat insulation
For unit hanging For pipe cover fixing
and adjustment of gas pipe of liquid tube
②Selection of installation location for the indoor unit
① Select the suitable areas to install the unit under approval of the user.
・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.
・Areas where there is enough space to install and service.
・Areas where it can be drained properly. Areas where drain pipe descending slope can be
taken.
・Areas where there is no obstruction of airflow on both air return grille and air supply port.
・Areas where fire alarm will not be accidentally activated by the air conditioner.
・Areas where the supply air does not short-circuit.
・Areas where it is not influenced by draft air.
・Areas not exposed to direct sunlight.
・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 humid-
ity condition and confirmed there is no problem. However, there is some risk of condensa-
tion 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.
・Areas where TV and radio stays away more than 1m. (It could cause jamming and noise.)
・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.
・Areas where there is no influence by the heat which cookware generates.
・Areas where not exposed to oil mist, powder and/or steam directly such as above fryer.
・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.)
②Check 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.
③If there are 2 units of wireless type, keep them away for more than 6m to avoid malfunction due
to cross communication.
④When plural indoor units are installed nearby, keep them away for more than 4 to 5m.
Space for installation and service
●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.
●Install the indoor unit at a height of more than 2.5m above the floor.
4000 to 5000mm or more
Indoor unit
Ceiling
surface
Wall
1000mm or more
Decorative panel
1000mm or more
Obstacle
Set blow-out pattern
●Select the most proper number of blow-out air supply port direction from 4 way, 3 way or 2 way
according to the shape of the room and installation position. (1 way is not available.)
●If it is necessary to change the number of air supply port, prepare the covering materials.
●Instruct the user not to use low fan speed when 2way or 3way air supply is used.
●Do not use 2way air supply port under high temperature and humidity environment.
(Otherwise it could cause condensation and leakage of water.)
●It is possible to set the airflow direction port by port independently. Refer to tne user's manual
for details.
○Pipes/Wires/Small parts ○Accessory items
For drain pipe
Strap Pipe cover(big) Pipe cover(small) Drain hose Hose clamp
4 1 1 1 1
For heat insulation For heat insulation For drain pipe
For drain hose
of drain socket
of drain socket connecting mounting
Indoor unit
2500mm or more
Floor
Where there are pipe joints on
the way of embedded piping,
provide adequate openings for
inspection of the joints.
③Preparation before installation
●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.
●Prepare four (4) sets of suspension bolt, nut and spring washer (M10 or M8) on site.
Ceiling opening, Suspension bolts pitch, Pipe position
860 to 910 (Ceiling hole size)
778 (Suspension bolts pitch)
G
H
H
H
260
Drain hose piece
345 303
(Accessory)
(Installed on site)
C
Hanger plate
B
for suspention bolt
control box
Air filter
Air return grille
④Installation of indoor unit
Work procedure
1. Prepare a ceiling hole with the size of from 860mm × 860mm to 910mm × 910mm
referring to the template attached in the package.
2. Arrange the suspension bolt at the right position (725mm×778mm).
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 50mm above the ceiling
plane. Temporarily put the four lower nuts 150mm 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.
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.
Keep the distance between 20-24 mm.
Exceeding the range of distance may cause
failure etc.
+4
20 mm
0
Ceiling opening dimensions
Level gauge
(Inserted into the unit)
205
- -
'12 • PAC-T-174
Series
40 to 71 type
Single Split (PAC)
series
100 to 140 type
control box
28 to 71 type
H
90 to 160 type
Symbol
A Gas piping
B Liquid piping
C Drain piping
D Hole for wiring
F Suspension bolts
G Outside air opening for ducting
H Air outlet opening for ducting
F
A
65
11
D
13
50
38
G
Suspension bolt
Nut (upper)
Flat washer
Spring wasler
Nut (lower)
150mm
50mm
Ceiling surface
Correct
Unit
Unit
Touch the nut (lower) and Play is left between the fixture
washer without any play and the nut (lower) and washer.
(mm)
Type a
246
298
246
298
140
60
100
H
Wrong