E) Ceiling Cassette-1 Way Compact Type (Fdtq) - Mitsubishi Heavy Industries FDT28KXE6A Service Manual

(e) Ceiling cassette-1way compact type (FDTQ)
①Before installation
●Install correctly according to the installation manual.
●Confirm the following points:
○Unit type/Power supply specification
Accessory item
For refrigerant pipe
Pipe cover(big) Pipe cover (small) Strap
1 1 4
For heat insulation For heat insulation
For pipe cover fixing
of liquid tube
of gas pipe
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
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.
・ 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.
② 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.
③ When plural indoor units are installed nearby, keep them away for more than 3m.
Space for installation and service
●Install the indoor unit at a height of more than 2.5m above the floor.
3000mm or more
Indoor unit
Ceiling
Wall
1000mm
surface
Decorative or more
panel
100mm or more
Obstacle
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) on site.
Ceiling opening, Suspension bolts pitch, Pipe position
Content
Symbol
A Gas piping
B Liquid piping
C Drain piping
Hole for wiring
D
E Suspension bolts
F1,2 Outside air opening for ducting
○Pipes/Wires/Small parts ○Accessory items
For drain pipe
Pipe cover(small)
Pipe cover(big) Drain hose Hose clamp
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 Indoor unit
Wall
2500mm
or more
Air supply
Air return
1500mm
or more
Floor
③Preparation before installation (continued)
●Direct blow panel
210
140
Drain hose piece
(Accessory)
(Installed on site)
A
B
C
D
45
295~325
Drain hose piece
(Accessory)
(Installed on site)
273
●Duct panel
Supply air duct
12-Ø4
Holes for
tapping screws
210
140
Drain hose piece
(Accessory)
(Installed on site)
A
B
C
D
45
295~325
Drain hose piece
(Accessory)
(Installed on site)
273
④Installation of indoor unit
Wall Work procedure
100mm 1. In case of installing on a ceiling other than 2 × 2 grid ceiling, prepare a ceiling hole with the
or more
size of 600mm × 740mm.
2. Arrange the suspension bolt at the right position (528mm × 576mm).
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 85mm above the ceiling plane.
Temporarily put the four lower nuts 125mm 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 so that the bottom surface of the indoor unit is
on the same level as the ceiling (bottom surface of the T bar).
The allowable gap between the bottom surface of the ceiling and that of the indoor unit is
when the bottom surface of the indoor unit is no higher than 5mm.
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.
Caution
● Do not install the bottom surface of the inddor unit
lower than the bottom surface of the ceiling.
[For 2 x 2 grid ceiling]
Celling
T bar
panel
T bar
Adjust the indoor unit position so that the bottom
surface of the indoor unit is on the same level as
the ceiling's bottom surface.
148
- -
PJC012D116
576
(Suspension bolts pitch)
250 35
Hanger plate for
288 288
suspension bolt
65
61
F
1
273 Control
Panel
box
center
Hole
4-Ø4
Holes for
F E 138
tapping screws
2
550
4-Ø4
53 255
Holes for
tapping screws
Hole
570
740 (Ceiling hole size)
82 576 82
(Suspension bolts pitch) 250 35
Hanger plate for
288 288
suspension bolt
65
61
F
1
Control
Panel
box
center
Hole
4-Ø4
Holes for
138
tapping screws
30 150 150 150 30
30 490 30
(Duct dimension)
576
(Suspension bolts pitch)
250 35
Hanger plate for
288 288
suspension bolt
65
61
F
1
Control
273
Panel
box
center
Hole Hole
4-Ø4
Holes for Holes for
F E
138
2 tapping screws tapping screws
550
4-Ø4
255
53
Holes for
tapping screws
Hole
570
740 (Ceiling hole size)
250 35
82 576 82
(Suspension bolts pitch)
Hanger plate for
suspension bolt
288 288
65
61
F
1
Control
Panel
box
center
Hole Hole
4-Ø4
Holes for Holes for
138
tapping screws tapping screws
125mm
85mm
[For ordinary ceiling]
Correct
Colling
Unit
panel
Touch the nut (lower) and
Adjust the indoor unit position so that the bottom
washer without any play
surface of the indoor unit is on the same level as
the ceiling's bottom surface.
c
Short panel
625
514
Air supply
Air return grille
580
Wide panel
780
514
Air supply
Air return grille
580
Short panel
625
Cover
Air return grille
580
Wide panel
780
Cover
Air return grille
580
Suspension bolt
Nut (upper)
Flat washer
Spring wasler
Nut (lower)
Ceiling surface
Wrong
Unit
Play is left between the
fixture and the nut (lower)
and washer.