18
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Piping installation
Installer and user reference guide
71
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 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
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).
C
A
B
D
E
C
C
E
a
b
x
y
4
3
1
2
1,2
VRV DX indoor unit
3
Branch selector unit (BS*)
4
Cooling-only VRV indoor unit
A~E
Piping
a,b
Indoor branch kit
x,y
Outdoor multi connection kit
Summary of Contents for REMQ5U7Y1B
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