6
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Installation
Installer reference guide
32
FNA25~60A2VEB(9)
Split system air conditioners
4P550955-3C – 2020.12
6.2.4 Guidelines when installing the drain piping
Make sure condensation water can be evacuated properly. This involves:
▪
General guidelines
▪
Connecting the drain piping to the indoor unit
▪
Checking for water leaks
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 20 mm nominal diameter and 26 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
O
Allowed
X
Not allowed
▪
Condensation.
Take measures against condensation. Insulate the complete drain
piping in the building.
▪
Rising piping
. If necessary to make the slope possible, you can 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, ≤625 mm perpendicular to the unit.
▪
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.
≥100
≤600
(mm)
a
a
T-joint
To connect the drain piping to the indoor unit
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 pipe connection.
2
Tighten the metal clamp until the screw head is less than 4 mm from the
metal clamp part.
3
Check for water leaks (see
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