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a b c
e
a
Heating air purge
b
Cooling air purge
c
Hot water inlet (DN3/4ʺ)
d
Hot water outlet (DN3/4ʺ)
e
Cold water inlet (DN3/4ʺ)
f
Cold water outlet (DN3/4ʺ)
To fill the water circuit
a
a
Air purge
b
Pressure relief valve
c
Cap
During filling, it might not be possible to remove all air in the system.
Remaining air can be removed during the first operating hours of the
unit. The air can be removed from the unit through the manual air
purge valve.
1
Open the cap.
2
Push the pressure relief valve to purge air from the unit water
circuit(s).
3
Close the cap.
4
Additional filling with water afterwards might be required (but
never through the air purge valve).
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.
FWE-F
Fan coil units
3P756931-1 – 2023.11
d
f
b
c
5.5
Drain piping installation
5.5.1
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).
▪ Condensation. Take measures against condensation. Insulate
the complete drain piping in the building.
▪ Slope. Make sure the drain piping slopes down (at least 1/50) to
prevent air from being trapped in the piping. Use hanging bars as
shown.
a
Hanging bar
Allowed
Not allowed
5.5.2
Connecting the drain piping
To connect the drain piping
NOTICE
Incorrect connection of the drain hose might cause leaks,
and damage the installation space and surroundings.
1 Push the drain hose as far as possible over the drain socket.
2 Tighten the screw from drain hose to drain pan's surface.
3 Check for water leaks.
a
Drain socket
4 Insert the drain hose and tighten with fixing screw (accessory
set).
5 Unit installation
a
b
a
Installation and operation manual
11
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