Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 843

19.5.1 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
below and perfect draining can be assured.
2) Places where perfect drainage can be prepared and sufficient drainage gradient
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 under 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. kitchens
and machine plants). (Istallation and use at such places will causes the perform-
ance 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 inflammable
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 syn-
thetic resin parts.
7) Do not place adjacent to equipment generating electromagnetic waves or high-frequency waves such as in hospitals, Gener-
ated 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 humidity
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 maximum
size of the square ceiling opening.
2) Location of pipes
For the location of pipe, see the exterior dimension.
(c) Hanging
• Arrange four sets of a hang 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 (675 780).
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 levelness 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
Ceiling opening dimension : 860 to 890 square
Hang bolt pitch : 780
F
G
267
Drain hose
332 310
(accessory)
840
Attach on site.
B
A
C
Hanger
Control box
Refrigerant piping
Drain
Level gauge
Adjust so that level gauge surface and
the lower surface of ceiling are in matching.
member Level gauge (insulation)
FDC-HKX
Type Space above ceiling (h)
Over 270mm
Over 330mm
• Installtation space
1‚000 and over
1‚000 and over
Obstacle
A Gas refrigerant piping
B Liquid refrigerant piping
C Drain piping connecting hole
D Power intake hole
E Hang bolt
F Outside air intake hole
G Supply air branch duct connecting hole
Unit : mm
c
Model
FDT28, 36, 45,
210
56, 71, 90
E 270
FDT112, 140
D
Hang bolt
Nut
Main
Washer
body
Spring
Washer
In-door unit
Hose
Fix the level gauge in alignment
with this face of supply air grill.
10~25
Supply air grill
Ceiling
(mm)
d
260
320
841