Fujitsu AUU7RLF Design & Technical Manual page 178

Condition
When using When using an external duct to take in new fresh air,
an external etc., condensation may form on the surface of the
duct. 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
remote conditioner directly contacts the thermostat section of
controller the remote controller, the outlet temperature of the air
installation conditioner may be sensed and room temperature
site is bad. 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.
When When the wall mounted type was installed in a
installation bedroom, living room, or other quiet place, the sound
environment of the refrigerant flow may be sensed as noise and
is quiet. must be taken into account.
When In the case of the ceiling chamber system (duct is not
installing duct installed at indoor unit inlet side and room air is
type in ceiling sucked into the indoor unit through the inside of the
chamber ceiling), the thermistor inside the indoor unit may not
system. correctly detect the room temperature.
• Heating operation: Room is not heated because
the indoor unit is easily turned off by the thermo-
stat.
• Cooling operation: Room is too cold because the
indoor unit is difficult to turn off by the thermostat.
When the Cooling operation does not cool the room and
outlet air is heating operation does not heat the room because
sucked in at the short circuited indoor unit is not turned on by the
duct type. thermostat.
When using Signals may not be received when using it in a room
the wireless illuminated by an inverter fluorescent lamp.
remote
controller.
When It may generate noise in TV sets, stereos and PCs.
installing the
inverter type.
Contents
- 172 -
Countermeasures (Reference)
Always perform heat insulation
processing.
(Heat insulating material: Glass
wool 25 mm (1-in) 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.
1. Plan installation of a model
with external expansion valve.
2. Plan installation of a branch
box farther from indoor unit.
3. Plan installation using another
air conditioner.
Replace the indoor unit
thermistor with optional Remote
sensor unit, and install the
sensor where the room
temperature can be correctly
detected.
1. Reconsider the ventilation port
construction.
2. Replace the indoor unit therm-
istor with optional Remote
sensor unit, and install the
sensor where the room
temperature can be correctly
detected.
Turn on the fluorescent lamp and
check if the indoor unit receives
the signals from the remote
controller. If the indoor unit does
not receive the signals, consult
an authorized service personnel.
The inverter type should be
installed at a sufficient distance
from these equipments.