18
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Piping installation
Installer and user reference guide
81
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
▪
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
a
8
a
9
D
D
d
a
3
a
4
a
1
a
2
C'
D
D
C''
C
b
1
a
5
a
6
D
a
7
D
D
b
2
a1~a9
VRV DX indoor units
b1~b3
Branch selector units (BS)
c
First indoor branch kit (refnet)
d
Indoor branch kit (refnet)
e
Outdoor multi connection kit
A~D
Piping
