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18
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Piping installation
Installer and user reference guide
67
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
▪
Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
18.1.2 Refrigerant piping material
▪
Piping material:
Phosphoric acid deoxidised seamless copper.
▪
Flare connections:
Only use annealed material.
▪
Piping temper grade and thickness:
Outer diameter (Ø)
Temper grade
Thickness (t)
(a)
6.4 mm (1/4")
9.5 mm (3/8")
12.7 mm (1/2")
Annealed (O)
≥0.80 mm
t
Ø
15.9 mm (5/8")
Annealed (O)
≥0.99 mm
19.1 mm (3/4")
Half hard (1/2H)
≥0.80 mm
(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.
18.1.3 To select the piping size
Determine the proper size using the following tables and reference figure (only for
indication).
INFORMATION
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Combination of VRV DX and RA DX indoor units is not allowed.
▪
Combination of RA DX and AHU indoor units is not allowed.
▪
Combination of RA DX and aircurtain indoor units is not allowed.
INFORMATION
If you install RA DX indoor units, you have to configure field setting [2‑38] (= type of
installed indoor units). See Mode 2: Field settings.
A
B-1
B-2
C-1
C-2
C-3
C-4
E
E
E
E
1
1
3-1
3-2
3-3
3-4
A
D
RA DX
VRV DX
D
4
4
5
5
5
5
2
2
2
2
1
Outdoor unit
2
Refrigerant branch kits
3-1~3-4
VRV DX indoor units
4
BP units
5
RA DX indoor units
A
Piping between outdoor unit and (first) refrigerant branch kit
B-1 B-2
Piping between refrigerant branch kits
C-1~C-4
Piping between refrigerant branch kit and indoor unit
D
Piping between refrigerant branch kit and BP unit
E
Piping between BP unit and RA DX indoor unit