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NOTICE
Air in the water circuit can cause malfunctioning. During
filling, it may not be possible to remove all the air from the
circuit. Remaining air will be removed through the
automatic air purge valves during the initial operating hours
of the system. Additional filling with water afterwards may
be required.
NOTICE
Make sure water quality complies with EU directive
2020/2184.
NOTICE
The air purge valve must be thermally insulated.
Otherwise, water may drip with condensation. After the air
is purged from the system, the air purge valve must be
insulated with the thermal insulation (a) (from accessory
set) so that its surface is completely covered as seen
below.
5.4
Drain piping installation
5.4.1
Guidelines when installing the drain
piping
General guidelines
▪ Pipe length. Keep drain piping as short as possible.
▪ Pipe size. Keep the pipe size equal to or greater than that of the
connecting pipe (vinyl pipe of 25 mm nominal diameter and
32 mm outer diameter).
▪ Slope. Make sure the drain piping slopes down (at least 1/100) to
prevent air from being trapped in the piping. Use hanging bars as
shown.
1~1.5 m
a
a
Hanging bar
Allowed
Not allowed
▪ Condensation. Take measures against condensation. Insulate
the complete drain piping in the building.
▪ Combining drain pipes. You can combine drain pipes. Make
sure to use drain pipes and T-joints with the correct gauge for the
operating capacity of the units.
FWF02~05D
Fan coil units
3P443944-9T – 2023.01
▪ Rising piping. If necessary to make the slope possible, you can
a
a
Drain socket position
5.4.2
To connect the drain piping
1 Push the drain hose as far as possible over the drain socket.
2 Tighten the metal clamp until the screw head is less than 4 mm
3 Check for water leaks.
a
T-joint
install rising piping.
▪ Drain hose inclination: 0~75 mm to avoid stress on the piping
and to avoid air bubbles.
▪ Rising piping: ≤300 mm from the unit, ≤630~645 mm
(depending on the decoration panel used) perpendicular to the
unit.
a
b
≤300
a
b
A
≤645 mm: In case of installation with BYFQ60B
≤630 mm: In case of installation with BYFQ60C
B
205 mm: In case of installation with BYFQ60B
220 mm: In case of installation with BYFQ60C
a
Metal clamp (accessory)
b
Drain hose (accessory)
c
Rising drain piping (vinyl pipe of 25 mm nominal diameter
and 32 mm outer diameter) (field supply)
d
Hanging bars (field supply)
a
a
Drain socket
Connecting the drain piping
NOTICE
Incorrect connection of the drain hose might cause leaks,
and damage the installation space and surroundings.
from the metal clamp part.
5 Unit installation
a
(mm)
1000~1500
c
d
d
(mm)
Installation and operation manual
11
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