14 Maintenance and service
Installation and operation manual
21
FWF02~05D
Fan coil units
3P443944-9T – 2023.01
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.
14.3
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.
14.3.1
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
:
NOTICE
Do NOT use water of 50°C or higher.
Possible
consequence:
Discoloration and deformation.
1
Open the suction grille.
Standard panel:
Design panel:
1
2
Remove the air filter.
Standard panel:
1
3
3
2
4
2×
Design panel:
3
3
1
2
4
2×
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.
4
Dry the air filter in the shadow.
5
Reattach the air filter and close the suction grille.
14.3.2
To clean the suction grille
NOTICE
Do NOT use water of 50°C or higher.
Possible
consequence:
Discoloration and deformation.
1
Open the suction grille.
