18
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Piping installation
Installer and user reference guide
65
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
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
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
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
In case of heat recovery system
A
B
B
B
C
D
E
E
x
y
b
a
4
3
1
2
