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▪ Filter. Be sure to attach an air filter inside the air passage on the
intake side. Use an air filter with dust collecting efficiency ≥50%
(gravimetric method).
12.2.3
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 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
Hanging bar
Allowed
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.
a
b
≤300
a
b
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)
▪ 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.
FXMA-A
VRV system air conditioner
3P680922-1A – 2022.01
a
1000~1500
(mm)
c
d
d
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.
a b
c
d
a
Drain pipe connection
b
Water inlet cover
c
Drain outlet for maintenance
d
Refrigerant pipes
Drain piping connection
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
4 Wind the large sealing pad (= insulation) around the metal
clamp and drain hose, and fix it with tie wraps.
5 Connect the drain piping to the drain hose.
1
2~6
c
2
A
A
1
A'
A'
a
b
3
a
Drain pipe connection (attached to the unit)
b
Drain hose (accessory)
c
Metal clamp (accessory)
d
Large sealing pad (accessory)
e
Drain piping (field supply)
12 Unit installation
a
(mm)
leaks" [ 4 18]).
"To check for water
d
e
4
5
≤4 mm
A-A'
Installation and operation manual
d
c
b
a
17
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