Mitsubishi Heavy Industries FDTCVA SERIES Technical Manual page 211

(b) Installation
<Delivery>
When delivering the package, move
the package to the installation as close
as possible.
When it is unpacked and then moved
to the installation place, suffi cient care
must be taken not to damage the unit
during transfer.
<Hanging bolt location>
360
250
Bottom face
Top face
To adjust the level, use a level gauge or adjust
as shown by the left fi gure.
Note: Unless the level is adjusted properly,
the fl oat switch may malfunction or
operate improperly.
(c) Duct work
Silencer chamber (blowout)
2
3 Canvas coupling
Insulation
7
Blow
5
outlet
6
In order not to transmit vibration from the main unit of air conditioner to the ceiling or slab, it is necessary to provide
means to prevent vibration, for example, a canvas coupling on the duct or rubber cushion on the main unit of air condi-
tioner.
A damper to control air volume should be installed on the joint of OA duct to facilitate control of air capacity after the
installation.
Location and from of blow outlet should be selected so that air from the outlet will be distributed all over the room, and
equipped with a device to control air volume.
Make sure to provide an inspection hole on the ceiling. It is indispensable to service electric equipment, motor, functional
components and cleaning of heat exchanger.
Make sure to insulate the duct to prevent dewing on it.
Thickness of insulating material is 65 mm minimum.
Bad example of duct work
2
For ventilation
When the building is a concrete structure, especially immediately after the construction, humidity tends to rise even if
the space over the ceiling is not substituted in place of a duct.
In such occasion, it is necessary to insulate the entire unit with glass wool (25 mm).
(Use a wire net or equivalent to hold the glass wool in place.)
b) It may run out the allowable limit of unit operation (Example: When outdoor air temperature is 35°CDB, suction air
temperature is 27°CWB) and it could result in such troubles as compressor overload, etc.
c) There is a possibility that the blow air volume may exceed the allowable range of operation due to the capacity of ven-
tilation fan or strength of wind blowing against external air louver so that drainage from the heat exchanger may fail to
reach the drain pan but leak outside (e.g. drip onto the ceiling) with consequential water leakage in the room.
Unless vibration isolation is provided between the unit and duct and between the unit and the slab, vibration will be transmit-
ted to the duct so that vibration noise may generate from between the ceiling and blow outlet or vibration may be transmitted
to the slab. Make sure to provide an effective vibration prevention means.
<Packing hardware>
Four pieces of packing hardware are
used.
Discard them after unpacking.
Packing hardware (4 pcs.)
1640
Wood base
Silencer chamber (intake)
3
3 A 3 Canvas coupling
4 Wind capacity
control damper
Ceiling surface
Air conditioner main unit.
Suction hole
1 (With air filter)
Insulation hole
(600 )
1
After removing the hardware,
retighten the screws.
(For securing of duct flange)
Remove
wood screw.
<Adjustment level>
Piping side
Water level
0 ~ 5 mm
Adjust the piping side a little lower than the opposite side.
Air filter is not installed in the main unit of air
conditioner. Air filter should be installed in the
suction grill which allows an ample access for
Detail of section A
(Vibration prevention of hanger)
cleaning.
Silencer chamber(s) may be necessary depending
OA
on the noise level allowed in the room where the
air conditioner is installed.
Additional silencer may be necessary where a
particularly low noise is required.
(Provision of silencer is a must at offi ces and a
meeting room.)
If a duct is not provided at the suction side but it is substituted
with the space over the ceiling, humidity in the space will increase
by the infl uence of capacity of ventilation fan, strength of wind
blowing against the outdoor air louver, weather (rainy day) and
others.
Louver to
outdoor air
a) Moisture in air is likely to condense over the external plates
of the unit and to drip on the ceiling.
Unit should be operated under the conditions as listed in the
above table and within the limitation of wind volume.
210
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<Securing of Hanging Bolt>
Secure the hanging bolts by either one
of following methods.
Steel reinforcement
Hole-in anchor
150 ~ 160mm
Insert
Hole-in plug
Hanging bolt M8 ~ 10
Concrete
Water in
Vinyl hole