Daikin VRV 5 RXYA8A7Y1B, Installer And User Manual

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18 | Piping installation
Installer and user reference guide
91
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
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")
22.2 mm (7/8")
Half hard (1/2H) ≥0.80 mm
28.6 mm (1 1/8") Half hard (1/2H) ≥0.99 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 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 temperature Humidity Minimum thickness
≤30°C 75% to 80% RH 15 mm
>30°C ≥80% RH 20 mm
18.1.4 To select the piping size
Determine the proper size using the following tables and reference figure (only for
indication).
B
A
B
c
e
C
C
D D
d
b
3
C'''
D D
d
a
10
a
11
a
1
a
2
a
3
a
4
a
5
a
6
a
7
a
8
a
9
D D
d
C'
D D
C''
C
b
1
D D D
b
2
a1~a11 VRV DX indoor units
b1~b3 SV units
c First indoor branch kit (header)
d Indoor branch kit (refnet)
e Outdoor multi connection kit