Fujitsu AJ 126LELDH Series Design & Technical Manual page 1016

¢ 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
36.
• Be careful when installing the unit at the following places.
Condition
When the If the indoor unit is installed where the installation height
ceiling is high. 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.
When lower When the lower level of the room is a semi-open space
level directly such as warehouse or parking lot the surface temperature
contacts the of the flooring will become low and the radiation of cold
outside air. 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 When an indoor unit is installed in a position where the
airflow outlet airflow will directly contact people, a draft may be
distribution is felt.
poor. In addition, when there are obstructions in the path of the
intake and outlet airflow, the air distribution may become
extremely bad.
When inside the When the indoor unit is installed where the inside of the
ceiling is high ceiling is 30 °C RH80% or greater, the dew point
temperature temperature of the outer perimeter may become higher
and high than the cabinet surface temperature and moisture will
humidity. condense on the surface of the cabinet and water drops
may fall inside the room.
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.
When using an When using an external duct to take in new fresh air, etc.,
external duct. condensation may form on the surface of the duct due to
the effect of the outside air temperature and the humidity
inside the ceiling.
When the If the cold or warm air blown out from the air conditioner
remote directly contacts the thermostat section of the remote
controller controller, the outlet temperature of the air conditioner may
installation site be sensed and room temperature control will be different
is bad. 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.
2-1. Indoor unit installation precautions
"Dimensions" in Chapter 4. INDOOR UNITS on page 04-
Contents
("Figure 2-1 Moist air curve")
- (09-6) -
Countermeasures (Reference)
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.
1. Adjust the louver fins or take
other measures matched to the
site.
2. Change the indoor unit outlet.
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.
2-2 Work method when
reinforcing the heat insulation
of on-site piping")
3. When the humidity inside the
ceiling changes considerably,
install a ventilation port.
Always perform heat insulation
processing.
(Heat insulating material: Glass wool
25 mm thick or more.)
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.
2. Installation precautions
("Figure