Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 195

(c) Installation of indoor unit
Work procedure
1) Prepare a ceiling hole with the size of from 860mm
package.
2) Arrange the suspension bolt at the right position (725mm
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.
eep the distance between 20-24 mm.
Exceeding the range of distance may cause
failure etc.
+4
20 mm
0
Level gauge
(Inserted into the unit)
(d) Installation of indoor unit (continued)
1) Make sure to install the indoor unit horizontally. Confirm the levelness of the indoor
unit with a level gauge or transpar-ent hose filled with water. Keep the height
difference at both ends of the indoor unit within 3mm.
2) Tighten four upper nuts and fix the unit after height and levelness adjustment.
Caution
Do not adjust the height by adjusting upper nuts. It will cause unexpected stress on the indoor unit and it will lead to deformation
of the unit, failure of attaching a panel, and generating noise from the fan.
Make sure to install the indoor unit horizontally and set the gap between the unit underside and the ceiling plane properly.
Improper installation may cause air leakage, dew condensation, water leakage and noise.
Even after decorative panel attached, still the unit height can be adjusted finely. Refer to the installation manual for decorative
panel for details.
Make sure there is no gap between decoration panel and ceiling surface, and between decora-tion panel and the indoor unit.
The gap may cause air leakage, dew condensation and water leakage.
In case decorative panel is not installed at the same time, or ceiling material is installed after the unit installed, put the
cardboard template for installation attached on the package (packing material of cardboard box) on the bottom of the unit in
order to avoid dust coming into the indoor unit.
860mm to 910mm
Ceiling opening dimensions
188
-
910mm referring to the template attached in the
778mm).
Suspension bolt
Nut (upper)
Flat washer
Spring wasler
Nut (lower)
150mm
50mm
Ceiling surface
Correct
Unit
Touch the nut (lower) and
washer without any play
-
Wrong
Unit
Play is left between the fixture
and the nut (lower) and washer.
Indoor unit
hose