Daikin VRV IV, Installer And User Reference Manual

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18 | Piping installation
Installer and user reference guide
69
RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for refrigerant.
▪ Only use phosphoric acid deoxidised seamless copper.
▪ Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
▪ Temper grade: use piping with temper grade in function of the pipe diameter as
listed in table below.
Pipe Ø Temper grade of piping material
≤15.9 mm O (annealed)
≥19.1 mm 1/2H (half hard)
▪ All piping lengths and distances have been taken into consideration (see "About
the piping length" [
4
73]).
18.1.2 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
Ambient temperature Humidity Minimum thickness
≤30°C 75% to 80% RH 15 mm
>30°C ≥80% RH 20 mm
18.1.3 To select the piping size
Determine the proper size using the following tables and reference figure (only for
indication).
A
B B B
C
D F
G
E
x
y
b
a
3
1 2 4 5
1,2 VRV DX indoor unit
3 Branch selector box (BP*)
4,5 RA DX indoor unit
a,b Indoor branch kit
x,y Outdoor multi connection kit
A, B, C: Piping between outdoor unit and (first) refrigerant branch kit
Choose from the following table in accordance with the outdoor unit total capacity
type, connected downstream.