12 Unit installation
Installation and operation manual
16
FXMA-A
VRV system air conditioner
3P688304-1 – 2022.03
e
Canvas duct (field supply)
f
Aluminium tape (field supply)
▪
Filter.
Be sure to attach an air filter inside the air passage on the
air inlet 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
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.
≥100
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.
a b
a
Drain pipe connection
b
Refrigerant pipes
Drain piping connection
1
Pull out the drain plug.
2
Install the adapter for the drain hose (field supply).
3
Push the drain hose as far as possible over the adapter for the
drain hose.
4
Tighten the metal clamp until the screw head is less than 4 mm
from the metal clamp part.
5
Check for water leaks (see
16]).
6
Install the insulation piece (drain pipe).
b
a
c
d
e
a
Indoor unit
b
BSP 1" internal thread
c
Adapter (field supply)
d
Metal clamp (field supply)
e
Insulation material for drain pipe (field supply)
To check for water leaks
The procedure differs depending on whether installation of the
system is already completed. When installation of the system is not
yet completed, temporarily connect the user interface and power
supply to the unit.
When installation of the system is not yet completed
1
Temporarily connect electrical wiring.
▪ Remove the service cover.
▪ Connect the power supply.
▪ Connect the user interface.
▪ Reattach the service cover.
a
L N
b
c
a
User interface terminal block
b
Power supply terminal block
c
Service cover with wiring diagram
2
Turn ON the power supply.
3
Start fan only operation (see the reference guide or the service
manual of the user interface).
4
Gradually pour approximately 1 l of water to the drain pan, and
check for leaks.
a
b
c d
a
Container with water
b
Drain pan
c
Drain outlet
