7 Maintenance and service
Installation and operation manual
11
FXUA50~100AVEB
VRV system air conditioner
3P668115-2C – 2022.01
6.2.2
Special heating operation modes
Operation
Description
Defrost
To prevent a loss of heating
capacity due to frost
accumulation in the outdoor unit,
the system will automatically
switch to defrost operation.
During defrost operation, the
indoor unit fan will stop
operation, and the following icon
will appear on the home screen:
The system will resume normal
operation after approximately 6
to 8 minutes.
Hot start
During hot start, the indoor unit
fan will stop operation, and the
following icon will appear on the
home screen:
6.2.3
Adjusting the airflow direction
The following airflow directions can be set:
Direction
Display
Fixed position
. The indoor unit
blows air in 1 of 5 fixed positions.
Swing
. The indoor unit alternates
between the 5 positions.
Auto.
The indoor unit adjusts its
airflow direction according to set
operation or according to
movement sensed by a
movement sensor.
INFORMATION
Depending on system layout and organisation, Auto airflow
direction may not be available.
Note:
The recommended position of the horizontal blades (flaps)
varies according to the operation mode.
a
b
a
Cooling operation
b
Heating operation
INFORMATION
For setting procedure of the airflow direction, see the
reference guide or the manual of the used user interface.
Automatic airflow control
Cooling
Heating
▪ When the room temperature is
lower than the controller's
setpoint for cooling operation
(including auto operation).
▪ When the indoor units run in
Continuous operation, and the
airflow direction is downward.
▪ When starting operation.
▪ When the room temperature is
higher than the controller's
setpoint for heating operation
(including auto operation).
▪ At defrost operation.
▪ When the indoor units run continuously for a long time and the
airflow direction is Horizontal.
WARNING
NEVER touch the air outlet or the horizontal blades while
the swing flap is in operation. Fingers may become caught
or the unit may break down.
NOTICE
Avoid operating in the horizontal direction. It may cause
dew or dust to settle on the ceiling or flap.
6.3
To operate the system
INFORMATION
For setting of the operation mode, airflow direction, active
circulation airflow or other settings, see the reference guide
or operation manual of the user interface.
7
Maintenance and service
7.1
Precautions for maintenance and
service
NOTICE
Maintenance MUST be done by an authorised installer or
service agent.
We recommend performing maintenance at least once a
year. However, applicable legislation might require shorter
maintenance intervals.
CAUTION: Pay attention to the fan!
It is dangerous to inspect the unit while the fan is running.
Make sure to turn OFF the main switch before executing
any maintenance task.
CAUTION
Do NOT insert fingers, rods or other objects into the air
inlet or outlet. When the fan is rotating at high speed, it will
cause injury.
NOTICE
NEVER inspect or service the unit by yourself. Ask a
qualified service person to perform this work. However, as
end user, you may clean the air filter, suction grille and the
unit exterior.
WARNING
NEVER replace a fuse with a fuse of a wrong ampere
ratings or other wires when a fuse blows out. Use of wire
or copper wire may cause the unit to break down or cause
a fire.
