Fujitsu AUU7RLF Design & Technical Manual page 161

Work method when reinforcing the heat insulation of on-site piping
Slit of heat insulating material
facing upward
Covered gas
pipe (heat
insulation
strengthened)
Heat insulating material
(locally purchased)
Condition
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.
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.
17-2. Points to remember when installing
Heat insulation reinforcement material
Flare connection
(locally purchased)
Small exposed part
Binding material
of copper pipe is desirable.
Fig. B
Contents
- 155 -
To indoor unit
Fit tightly
(purpose is to cover the sealant)
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
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.
17. Indoor unit installation precautions