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18
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Piping installation
18.1.3 Refrigerant piping insulation
18.1.4 To select the piping size
A: Piping between outdoor unit and (first) refrigerant branch kit
Installer and user reference guide
88
Outer diameter (Ø)
6.4 mm (1/4")
9.5 mm (3/8")
12.7 mm (1/2")
15.9 mm (5/8")
19.1 mm (3/4")
22.2 mm (7/8")
25.4 mm (1")
(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.
▪
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 temperature
≤30°C
>30°C
Determine the proper size using the following tables and reference figure (only for
indication).
B'
b
B'''
d
C
C
C
a
a
a
a
10
11
1
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
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.
Temper grade
Annealed (O)
Annealed (O)
Half hard (1/2H)
Half hard (1/2H)
Humidity
75% to 80% RH
≥80% RH
e
A
B
b
1
2
B''
d
C
C
C
C
C
a
a
a
a
2
3
4
5
6
(a)
Thickness (t)
≥0.80 mm
≥0.99 mm
≥0.80 mm
≥0.88 mm
Minimum thickness
15 mm
20 mm
B
b
3
B
d
C
C
C
a
a
a
7
8
9
VRV 5-S system air conditioner
4P752782-1A – 2024.02
Ø
t
RXYSA8~12AMY1B
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