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13 Piping installation
A
C
a b
B
A
Right-side piping
B
Right-bottom piping
C
Right-back piping
a
Remove the pipe port cover here for right side piping
b
Remove the pipe port cover here for right-bottom piping
To connect the piping on left side, left-back, or left-
bottom
INFORMATION
The factory default is right-side piping. For left-side piping,
remove the piping from the right side and install it on the
left side.
1 Remove the insulation fixing screw on the right side and
remove the drain hose.
2 Remove the drain plug on the left side and attach it to the right
side.
NOTICE
Do NOT apply lubricating oil (refrigerant oil) to the drain
plug when inserting it. The drain plug may deteriorate and
cause drain leakage from the plug.
3 Insert the drain hose on the left side and do not forget to tighten
it with the fixing screw; otherwise water leakage may occur.
4 Attach the drain hose to the refrigerant piping bottom side using
adhesive vinyl tape.
b
A
Left-side piping
B
Left-back piping
C
Left-bottom piping
a
Remove the pipe port cover here for left-side piping
b
Remove the pipe port cover here for left-bottom piping
To check for water leaks
1 Remove the air filters (see
"7.2.3 To clean the air
2 Gradually pour approximately 1 l of water in the drain pan, and
check for water leaks.
a
b
a
Drain pan
b
Plastic container
3 Reattach the air filters (see
Installation and operation manual
16
a
A
B
C
filter" [ 4 11]).
"7.2.3 To clean the air
filter" [ 4 11]).
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.
▪ 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)
15.9 mm (5/8")
Annealed (O)
(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
9.5 mm (3/8")
12~15 mm
15.9 mm (5/8")
17~20 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.
Gas pipe
Ø15.9
(a)
Thickness (t)
Ø
≥0.8 mm
t
Insulation thickness
)
(t)
i
≥13 mm
≥13 mm
FAA71+100BUV1B
Split system air conditioner
3P654518-1A – 2021.03
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