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13.2
Precautions for maintenance and
service
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, air
outlet and outside panels.
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.
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.
NOTICE
When cleaning the heat exchanger, make sure to remove
the switch box, fan motor, drain pump and float switch.
Water or detergent might deteriorate the insulation of
electronic components and result in burnout of these
components.
WARNING
Be careful with ladders when working in high places.
13.3
Cleaning the air filter, suction
grille, air outlet and outside panels
CAUTION
Turn off the unit before cleaning the air filter, suction grille,
air outlet and outside panels.
NOTICE
▪ Do NOT scrub firmly when washing the blade with
water. Possible consequence: The surface sealing
peels off.
Clean with a soft cloth. If it is difficult to remove stains, use water or
a neutral detergent.
13.3.1
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.
▪ If the dirt becomes impossible to clean, change the air filter
(= optional equipment).
How to clean the air filter:
FWE-F
Fan coil units
3P756931-1 – 2023.11
13 Maintenance and service
NOTICE
Do NOT use water of 50°C or higher. Possible
consequence: Discoloration and deformation.
1 Switch off the power supply. The air filter can be installed right
side and left side.Remove the filter by sliding as shown below.
2 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.
3 Dry the air filter in the shadow.
4 Reattach the air filter and close the suction grille.
13.4
Maintenance after a long stop
period
E.g., at the beginning of the season.
▪ Check and remove everything that might be blocking inlet and
outlet vents of indoor units and outdoor units.
▪ Clean air filters and casings of indoor units (see
filter" [ 4 17] and To clean the air outlet and outside
the air
panels).
13.5
Maintenance before a long stop
period
E.g., at the end of the season.
▪ Let the indoor units run in fan only operation for about half a day in
order to dry the interior of the units. Refer to About cooling,
heating, fan only, and automatic operation for details on fan only
operation.
▪ Turn off the power. The user interface display disappears.
▪ Clean air filters and casings of indoor units (see
the air
filter" [ 4 17] and To clean the air outlet and outside
panels).
"13.3.1 To clean
"13.3.1 To clean
Installation and operation manual
17
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