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7 Maintenance and service
Automatic airflow control
Cooling
▪ 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 the indoor units run continuously for a long time and the
airflow direction is Horizontal.
WARNING
NEVER touch the air outlet or the horizontal/vertical 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 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
CAUTION
instructions" [ 4 5] to acknowledge all
See
"3 User safety
related safety instructions.
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 and the unit exterior.
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.
NOTICE
Do NOT wipe the controller operation panel with benzine,
thinner, chemical dust cloth, etc. The panel may get
discoloured or the coating peeled off. If it is heavily dirty,
soak a cloth in water-diluted neutral detergent, squeeze it
well and wipe the panel clean. Wipe it with another dry
cloth.
Following symbols may occur on the indoor unit:
Symbol
Explanation
Measure the voltage at the terminals of main circuit
capacitors or electrical components before servicing.
Installation and operation manual
10
Heating
▪ When starting operation.
▪ When the room temperature is
higher than the controller's
setpoint for heating operation
(including auto operation).
▪ At defrost operation.
NOTICE
When cleaning the heat exchanger, make sure to remove
the electronic components above it. Water or detergent
might deteriorate the insulation of electronic components
and result in burnout of these components.
DANGER: RISK OF ELECTROCUTION
Disconnect the power supply for more than 10 minutes,
and measure the voltage at the terminals of main circuit
capacitors or electrical components before servicing. The
voltage MUST be less than 50 V DC before you can touch
electrical components. For the location of the terminals,
see the warning label for persons performing service and
maintenance.
a
A1P
C-
C+
A1P
Main printed circuit board
a
Multimeter
C
Residual voltage measuring points
7.2
Cleaning the unit exterior and air
filter
CAUTION
Turn off the unit before cleaning the unit exterior and air
filter.
NOTICE
▪ Do NOT use gasoline, benzene, thinner polishing
powder or liquid insecticide. Possible consequence:
Discoloration and deformation.
▪ Do NOT use water or air of 50°C or higher. Possible
consequence: Discoloration and deformation.
▪ Do NOT scrub firmly when washing the blade with
water. Possible consequence: The surface sealing
peels off.
7.2.1
To clean the exterior
WARNING
Do
NOT
let
the
indoor
consequence: Electrical shock or fire.
Clean with a soft cloth. If it is difficult to remove stains, use water or
neutral detergent and wipe with a dry cloth.
7.2.2
To clean the air filter
When to clean the air filter:
▪ Rule of thumb: Clean every 6 months. If the air in the room is
extremely contaminated, increase the cleaning frequency.
▪ Depending on the settings, the user interface can display the
"Time to clean filter" notification. Clean the air filter when the
notification is displayed.
▪ If the dirt becomes impossible to clean, change the air filter
(= optional equipment).
How to clean the air filter:
1 Open the panel. Simultaneously slide the two knobs and open
the decoration panel carefully.
unit
get
wet.
Possible
FXKQ-A
VRV system air conditioner
3P747532-1A – 2023.11
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