Fujitsu AUYG18LVLB, Design & Technical Manual

Page: 183 / 343

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Points to remember when installing
• The product shall be installed at a place which can withstand the weight and vibration of the in-
door.
• To allow maintenance after refrigerant piping, drain piping, and electric wiring connection and in-
stallation, provide an installation service space and an inspection port, as required.
*Installation service space is shown on
"Dimensions" on page 10.
• Be careful when installing the unit at the following places.
Condition Contents Countermeasures (Reference)
When the
ceiling is high. If the indoor unit is installed where the installation height
given in the installation manual is exceeded, the
temperature difference between the floor and ceiling of the
room will be large and the heating effect will be poor.
Moreover, even if the indoor unit is installed within the
installation height, a similar phenomena will occur when
installed in a room in which the doors are opened and
closed frequently and hot air circulation is obstructed by
furniture such as desks or chairs. 1. Switch the setting to the high
ceiling mode.
2. Install a circulator.
3. Arrange the furniture in the
room so that it does not
obstruct the hot air.
When lower
level directly
contacts the
outside air. When the lower level of the room is a semi-open space
such as warehouse or parking lot the surface temperature
of the flooring will become low and the radiation of cold
from the floor will increase.
In this case, even if the room temperature is suitable, you
may feel the foot level is cold.
When the
airflow
distribution is
poor. When an indoor unit is installed in a position where the
outlet airflow will directly contact people, a draft may be
felt.
In addition, when there are obstructions in the path of the
intake and outlet airflow, the air distribution may become
extremely bad. 1. Adjust the louver fins or take
other measures matched to the
site.
2. Change the indoor unit outlet.
When inside the
ceiling is high
temperature
and high
humidity. When the indoor unit is installed where the inside of the
ceiling is 30 °C RH80% or greater, the dew point
temperature of the outer perimeter may become higher
than the cabinet surface temperature and moisture will
condense on the surface of the cabinet and water drops
may fall inside the room. (
"Figure 1-1 Moist air curve " )
In addition, the humidity may vary considerably the same
as when the inside of the ceiling is close to hermetically
sealed and used as the outside air intake path.
1. Add heat insulating material to
the outside of the indoor unit
cabinet.
*Regarding the cassette type,
use of optional High humidity
correspondence kit is
recommended.
2. Strengthen the heat insulating
material of the refrigerant
piping and drain piping too.
(
"Figure 1-2 Work method
when reinforcing the heat
insulation of on-site piping
" )
3. When the humidity inside the
ceiling changes considerably,
install a ventilation port.
When using an
external duct. When using an external duct to take in new fresh air, etc.,
condensation may form on the surface of the duct due to
the effect of the outside air temperature and the humidity
inside the ceiling. Always perform heat insulation
processing.
(Heat insulating material: Glass wool
25 mm thick or more.)
When the
remote
controller
installation site
is bad. If the cold or warm air blown out from the air conditioner
directly contacts the thermostat section of the remote
controller, the outlet temperature of the air conditioner may
be sensed and room temperature control will be different
from the room temperature, and “not cooled” or “not
heated” or other trouble may occur.
In addition, there is the possibility that the same kind of
trouble may also occur when the remote controller is
effected by direct sunlight. 1. Install the remote controller
where it will not be directly
exposed to the cold or hot air.
2. Install the remote controller
where it will not be directly
exposed to sunlight or strong
lighting.
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1-1. Indoor unit installation precautions 1. Installation precautions
SYSTEM DESIGN SYSTEM DESIGN