Daikin VRV 5-S - Refrigerant Piping Insulation; To Select the Piping Size

18 | Piping installation
Installer and user reference guide
88
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
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
25.4mm (1") Half hard (1/2H) ≥0.88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).
A
e
B
B
C
C
d
b
3
B'''
C
C
d
a 10 a 11 a 1 a 2 a 3 a 4 a 5 a 6 a 7 a 8 a 9
C C
d
B'
CC
B''
B
b 1
C CC
b 2
a1~a11 VRVDX indoor units
b1~b3 SV units
c First branch kit (header)
d Indoor branch kit (refnet)
e VRV 5-S outdoor unit
A~C Piping
A: Piping between outdoor unit and (first) refrigerant branch kit
Choose from the following table in accordance with the outdoor unit capacity type.
In case there is no first indoor branch kit (c), pipe A is connected to the first SV unit
or VRV DX indoor unit.