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

18.1.2 Refrigerant piping insulation

18.1.3 To select the piping size

RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
▪ 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
INFORMATION
Please select the proper pipe sizes depending on the mode of your system. There are
2 possible modes:
▪
heat pump,
▪
heat recovery.
Determine the proper size using the following tables and reference figure (only for
indication).
In case of heat pump system
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
In case of heat recovery system
a
D E
3 4
b
E
1 2
Humidity
75% to 80% RH
≥80% RH
B B
A
x
C
y
G
5
B B
A
x
C
y
18 Piping installation
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Minimum thickness
15 mm
20 mm
B
B
Installer and user reference guide
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