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13 Piping installation
Drain piping connection
1
2~5
c
a
b
1
A
d c b
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)
f
Tightened part of metal clamp
A
In case of bending the end of the metal clamp
B
In case of wrapping the end of the metal clamp with vinyl
tape
1 Push the drain hose as far as possible over the drain pipe
connection.
2 Tighten the metal clamp at the base of the drain socket. Wrap
the end of the metal clamp with vinyl tape or bend the end
inwards to avoid damaging the sealing pad.
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. Start wrapping
from the tightened part of the metal clamp so that the end of the
metal clamp is wrapped twice.
5 Connect the drain piping to the drain hose.
To check for water leaks
Make sure the unit is level in accordance with the instructions in
"12.2.1 Guidelines when installing the indoor
pour approximately 1 l of water through the air discharge outlet, and
check for leaks.
a
b
a
Air outlet
b
Plastic water container with tube length ≥100 mm
Installation and operation manual
16
d
e
2
3
4
5
A
A
A'
A'
A-A'
A-A'
B
f
d c b
f
leaks" [ 4 16]).
"To check for water
unit" [ 4 13]. Gradually
(mm)
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 16]. 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 piping.
▪ 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:
Class
Liquid pipe
32
63+100
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)
6.4 mm (1/4")
Annealed (O)
9.5 mm (3/8")
12.7 mm (1/2")
15.9 mm (5/8")
(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
Pipe outer diameter
Insulation inner
(Ø
)
diameter (Ø
p
6.4 mm (1/4")
8~10 mm
9.5 mm (3/8")
12~15 mm
12.7 mm (1/2")
14~16 mm
15.9 mm (5/8")
17~20 mm
Ø
Ø
i
i
Ø
Ø
p
p
t
Pipe outer diameter (mm)
Gas pipe
Ø6.4
Ø12.7
Ø9.5
Ø15.9
(a)
Thickness (t)
Ø
≥0.8 mm
Insulation thickness
)
(t)
i
≥10 mm
≥13 mm
≥13 mm
≥13 mm
FXHQ-A
VRV system air conditioner
3P668115-3E – 2022.11
t
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