7 Maintenance and service
Installation and operation manual
12
FXUA50~100AVEB
VRV system air conditioner
3P668115-2C – 2022.01
CAUTION
After a long use, check the unit stand and fitting for
damage. If damaged, the unit may fall and result in injury.
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.
CAUTION
Before accessing terminal devices, make sure to interrupt
all power supply.
DANGER: RISK OF ELECTROCUTION
To clean the air conditioner or air filter, be sure to stop
operation and turn all power supplies OFF. Otherwise, an
electrical shock and injury may result.
WARNING
Be careful with ladders when working in high places.
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
b
c c
a
Control box
b
Printed circuit board
c
Residual voltage measuring points
7.2
Cleaning the unit exterior, air filter
and suction grille
CAUTION
Turn off the unit before cleaning the unit exterior, air filter
and suction grille.
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 unit get wet.
Possible
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 suction grille.
Simultaneously slide the two knobs
and open the suction grille carefully.
a
a
a
Knobs
2
Remove the air filter.
Pull the bottom end of the air filter on
each side to remove it from the tabs on the suction grille, then
lift the air filter up to remove it from the tabs on the top part of
the suction grille.
2
a
c
a
a
b
d
a
1
1
1
2
2
a
Air filter
b
Bottom end of the air filter
c
Tab on the bottom part of the suction grille
d
Tab on the top part of the suction grille
3
Clean the air filter.
Use a vacuum cleaner or wash with water.
If the air filter is very dirty, use a soft brush and neutral
detergent.
