Refrigerant Piping Insulation; To Select The Piping Size - Daikin VRV IV+ RYYQ14U7Y1B Series Installer And User Manual

18.1.2 Refrigerant piping insulation

18.1.3 To select the piping size

A, B, C: Piping between outdoor unit and (first) refrigerant branch kit
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1B – 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
≤15.9 mm
≥19.1 mm
▪ All piping lengths and distances have been taken into consideration (see
4
the piping length" [ 76]).
▪ 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).
a
D F
b 3
E
1 2 4
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
Choose from the following table in accordance with the outdoor unit total capacity
type, connected downstream.
Temper grade of piping material
Humidity
75% to 80% RH
≥80% RH
B B
A
x
C
y
G
5
18 Piping installation
|
O (annealed)
1/2H (half hard)
Minimum thickness
15 mm
20 mm
B
Installer and user reference guide
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