12 Operation
Installation and operation manual
20
FWF02~05D
Fan coil units
3P443944-9T – 2023.01
This operation manual offers a non-exhaustive overview of the main
functions of the system.
For more information about the user interface, see the operation
manual of the installed user interface.
12
Operation
12.1
Operation range
NOTICE
When unit starts to operate, it runs at a low speed for a
certain period before it reaches set point. This is not a
malfunction.
The following conditions are standard operating limits. For different
conditions, please consult the dealer.
Mode
Condition Air
temperature
limit, (DB/WB)
Water
temperature
limit, (in/out)
Water
delta T,
ΔT
Cooling
(˚C)
Min.
15/12.5
5/8
3 to 10
Max.
33/26
18/28
Heating
(˚C)
Min.
18/15
45/40
5 to 20
Max.
25/15
80/75
13
Energy saving and optimum
operation
Observe the following precautions to ensure the system operates
properly.
▪ Adjust the air outlet properly and avoid direct air flow to room
inhabitants.
▪ Adjust the room temperature properly for a comfortable
environment. Avoid excessive heating or cooling.
▪ Prevent direct sunlight from entering a room during cooling
operation by using curtains or blinds.
▪ Ventilate often. Extended use requires special attention to
ventilation.
▪ Keep doors and windows closed. If the doors and windows remain
open, air will flow out of your room causing a decrease in the
cooling or heating effect.
▪ Be careful NOT to cool or heat too much. To save energy, keep
the temperature setting at a moderate level.
▪ NEVER place objects near the air inlet or the air outlet of the unit.
Doing so may cause a reduced heating/cooling effect or stop
operation.
▪ Condensation may form if the humidity is above 80% or if the
drain outlet gets blocked.
NOTICE
Do NOT use the system for other purposes. In order to
avoid any quality deterioration, do NOT use the unit for
cooling precision instruments, food, plants, animals, or
works of art.
CAUTION
Do NOT operate the system when using a room
fumigation-type insecticide. Chemicals could collect in the
unit, and endanger the health of people who are
hypersensitive to chemicals.
14
Maintenance and service
14.1
Maintenance safety precautions
DANGER: RISK OF BURNING/SCALDING
DANGER: RISK OF ELECTROCUTION
NOTICE
Keep the air filter clean and check the airflow rate
periodically.
WARNING
▪ Before carrying out any maintenance or repair activity,
ALWAYS switch off the circuit breaker on the supply
panel.
▪ Make sure you do NOT touch a conductive section.
▪ Do NOT rinse the outside of the unit. This may cause
electric shocks or fire.
To clean the outside of your fan coil unit:
1
Switch off the fan coil unit.
2
Clean the outside of the fan coil unit with a soft cloth.
CAUTION
▪ Do NOT obstruct the air outlet or inlet of the unit in any
way.
▪ Do NOT place damp or wet clothing on the air outlet
grille of the unit.
▪ Do NOT pour liquids inside the equipment.
Never clean your fan coil unit with:
▪ any aggressive chemical solvent,
▪ water hotter than 50°C.
For maintenance of your fan coil unit, contact your installer or
service company.
14.2
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.
