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13 Piping installation
NOTICE
▪ Do NOT remove the drain pipe plug. Water might leak
out.
▪ Use the drain outlet only to discharge the water if the
drain pump is not used or before maintenance.
▪ Insert and remove the drain plug gently. Excessive
force may deform the drain socket of the drain pan.
Drain outlet for maintenance
Pull out the plug.
▪ Do NOT wiggle the plug up and down.
a
Push in the plug.
▪ Set the plug and push it in using a Phillips screwdriver.
a
b
a
Drain plug
b
Philips screwdriver
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.
c
a
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 Remove the water inlet cover (1 screw).
5 Gradually pour approximately 1 l of water through the water
inlet, and check for leaks.
Installation and operation manual
18
a
a
Drain connection
b
Water inlet
c
Refrigerant pipes
d
Drain outlet for maintenance
e
Water inlet cover
f
Bucket (adding water through water inlet)
g
Portable pump
6 Turn OFF the power.
7 Disconnect the electrical wiring.
▪ Remove the service cover.
▪ Disconnect the power supply.
▪ Disconnect the user interface.
▪ Reattach the service cover.
When installation of the system is already completed
1 Start cooling operation (see the reference guide or the service
manual of the user interface).
2 Gradually pour approximately 1 l of water through the water
inlet, and check for leaks (see
is not yet
completed" [ 4 18]).
13
Piping installation
13.1
Preparing refrigerant piping
13.1.1
Refrigerant piping requirements
CAUTION
Piping MUST be installed according to instructions given in
"13 Piping
braze+flare connections) that are compliant with the latest
version of ISO14903 can be used.
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
b
Refrigerant piping diameter
For piping connections of the indoor unit, use the following piping
diameters:
Class
50~80
100+125
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
b
c
d
e
"When installation of the system
installation" [ 4 18]. Only mechanical joints (e.g.
Pipe outer diameter (mm)
Liquid pipe
Ø6.4
Ø9.5
VRV system air conditioner
3P680922-1A – 2022.01
f
Gas pipe
Ø12.7
Ø15.9
FXMA-A
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