Fujitsu AUYG18LVLB Design & Technical Manual page 184

Condition
When When the wall mounted type was installed in a bedroom,
installation living room, or other quiet place, the sound of the
environment is refrigerant flow may be sensed as noise and must be
quiet. taken into account.
When installing In the case of the ceiling chamber system (duct is not
duct type in installed at indoor unit inlet side and room air is sucked
ceiling chamber into the indoor unit through the inside of the ceiling), the
system. thermistor inside the indoor unit may not correctly detect
the room temperature.
• Heating operation: Room is not heated because the
indoor unit is easily turned off by the thermostat.
• Cooling operation: Room is too cold because the indoor
unit is difficult to turn off by the thermostat.
When the outlet Cooling operation does not cool the room and heating
air is sucked in operation does not heat the room because the short
at duct type. circuited indoor unit is not turned on by the thermostat.
When using the Signals may not be received when using it in a room
wireless remote illuminated by an inverter fluorescent lamp.
controller.
When installing It may generate noise in TV sets, stereos and PCs.
the inverter
type.
Figure 1-1 Moist air curve
1-1. Indoor unit installation precautions
Contents
Relative humidity 80 %
Dry bulb temperature 30 °C
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Countermeasures (Reference)
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
thermistor 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.
Condition which
requires addition
of outside heat
insulation
1. Installation precautions