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d
Refrigerant pipes
5 Turn OFF the power.
6 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 to the drain pan, and
check for leaks (see
"When installation of the system is not yet
completed" [ 4 16]).
13
Piping installation
13.1
Preparing refrigerant piping
13.1.1
Refrigerant piping requirements
CAUTION
Piping MUST be installed according to instructions given in
installation" [ 4 17]. Only mechanical joints (e.g.
"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.
Refrigerant piping diameter
For piping connections of the indoor unit, use the following piping
diameters:
Pipe outer diameter (mm)
Liquid pipe
Ø9.5
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness:
Outer diameter
Temper grade
(Ø)
9.5 mm (3/8")
Annealed (O)
19.1 mm (3/4")
(a)
Depending on the applicable legislation and the maximum
working pressure of the unit (see "PS High" on the unit name
plate), larger piping thickness might be required.
13.1.2
Refrigerant piping insulation
▪ Use polyethylene foam as insulation material:
▪ with a heat transfer rate between 0.041 and 0.052 W/mK (0.035
and 0.045 kcal/mh°C)
▪ with a heat resistance of at least 120°C
▪ Insulation thickness
FXMA-A
VRV system air conditioner
3P688304-1 – 2022.03
Gas pipe
Ø19.1
(a)
Thickness (t)
Ø
≥0.8 mm
t
Pipe outer diameter
Insulation inner
(Ø
)
diameter (Ø
p
9.5 mm (3/8")
10~14 mm
19.1 mm (3/4")
20~24 mm
Ø
Ø
i
i
Ø
Ø
p
p
t
If the temperature is higher than 30°C and the humidity is higher
than RH 80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
13.2
Connecting the refrigerant piping
DANGER: RISK OF BURNING/SCALDING
INFORMATION
▪ For liquid piping, use a flare connection.
▪ For gas piping, use the attached piping (accessory)
and fix it with the hexagon head bolts and spring
washers (accessory)
13.2.1
To connect the refrigerant piping to the
indoor unit
CAUTION
Install the refrigerant piping or components in a position
where they are unlikely to be exposed to any substance
which may corrode components containing refrigerant,
unless the components are constructed of materials that
are inherently resistant to corrosion or are suitably
protected against corrosion.
WARNING: MILDLY FLAMMABLE MATERIAL
The refrigerant inside this unit is mildly flammable.
▪ Pipe length. Keep refrigerant piping as short as possible.
1 Connect the liquid piping to the unit using the flare
connections.
b
a
c
d
a
Field piping
b
Flare nut (attached to the unit)
c
Refrigerant pipe connection (attached to the unit)
d
Indoor unit
2 Connect the gas piping using the attached piping (accessory).
Fix it to the unit using hexagon head bolts (M10×40)
(accessory) and spring washers (accessory). Place sealing (on
the attached piping) between the connection.
a
b
c
d
e
a
Field piping
b
Hexagon head bolt (M10×40)
c
Spring washer (accessory)
d
Attached piping
e
Sealing (on the attached piping)
f
Indoor unit
13 Piping installation
Insulation thickness
)
(t)
i
≥13 mm
≥13 mm
f
Installation and operation manual
17
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