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15 Piping installation
14.3.4
To prevent the outdoor unit from falling
over
In case the unit is installed in places where strong wind can tilt the
unit, take following measure:
1 Prepare 2 cables as indicated in the following illustration (field
supply).
2 Place the 2 cables over the outdoor unit.
3 Insert a rubber sheet between the cables and the outdoor unit
to prevent the cables from scratching the paint (field supply).
4 Attach the ends of the cables.
5 Tighten the cables.
15
Piping installation
CAUTION
See
"2 Specific installer safety
sure this installation complies with all safety regulations.
15.1
Preparing refrigerant piping
15.1.1
Refrigerant piping requirements
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.
15.1.2
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")
Annealed (O)
19.1 mm (3/4")
Half hard (1/2H)
22.2 mm (7/8")
25.4 mm (1")
Half hard (1/2H)
(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.
Installation and operation manual
28
instructions" [ 4 5] to make
(a)
Thickness (t)
Ø
≥0.80 mm
t
≥0.99 mm
≥0.80 mm
≥0.88 mm
15.1.3
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:
Ambient
Humidity
temperature
≤30°C
75% to 80% RH
>30°C
≥80% RH
15.1.4
To select the piping size
Determine the proper size using the following tables and reference
figure (only for indication).
e
A
B'
b
1
B'''
B''
d
d
C
C
C
C
C
a
a
a
a
a
10
11
1
2
3
a1~a11
VRV DX indoor units
b1~b3
SV units
c
First branch kit (header)
d
Indoor branch kit (refnet)
e
VRV 5-S outdoor unit
A~C
Piping
A: Piping between outdoor unit and (first)
refrigerant branch kit
Choose from the following table in accordance with the outdoor unit
capacity type. In case there is no first indoor branch kit (c), pipe A is
connected to the first SV unit or VRV DX indoor unit.
HP class
Piping outer diameter [mm]
Gas pipe
8~10
12
Minimum thickness
15 mm
20 mm
B
B
b
b
2
3
B
d
C
C
C
C
C
a
a
a
a
a
4
5
6
7
8
Liquid pipe
19.1
9.5
22.2
12.7
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752781-1B – 2024.02
C
a
9
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