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

18.1.2 Refrigerant piping insulation

18.1.3 To select the piping size

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
≤15.9 mm
≥19.1 mm
▪ All piping lengths and distances have been taken into consideration (see
4
the piping length" [ 75]).
▪ 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
A
D E
3 4
b
E
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
Temper grade of piping material
Humidity
75% to 80% RH
≥80% RH
C C
x
y
B
18 Piping installation
|
O (annealed)
1/2H (half hard)
Minimum thickness
15 mm
20 mm
C
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