Daikin BEV2, Installer'S Reference Manual

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7 | Piping installation
Installer reference guide
22
BEV2N-A
CO₂ Conveni-Pack: BEV2 unit
4P677928-1 – 2021.10
Refrigerant piping diameter
Pipe outer diameter (mm)
2× Ø9.5
Refrigerant piping material
▪ Piping material: K65 copper-iron alloy (CuFe2P), maximum operating pressure =
120 bar
▪ Piping temper grade and thickness:
Outer diameter (Ø) Temper grade Thickness (t)
(a)
9.5 mm (3/8") R420
(drawn)
≥0.65 mm
t
Ø
(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.
7.1.2 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
Pipe outer diameter (Ø
p
) Insulation inner diameter
(Ø
i
)
Insulation thickness (t)
9.5 mm (3/8") 10~14 mm ≥10 mm
Ø
i
Ø
i
t
Ø
p
Ø
p
If the temperature is higher than 30°C and the humidity is higher than RH 80%, the
thickness of the insulation materials should be at least 20 mm to prevent
condensation on the surface of the insulation.
7.2 Connecting the refrigerant piping
7.2.1 About connecting the refrigerant piping
Before connecting the refrigerant piping
Make sure the outdoor and indoor unit are mounted.
Typical workflow
Connecting the refrigerant piping involves:
▪ Connecting the refrigerant piping to the indoor unit
▪ Connecting the refrigerant piping to the outdoor unit
▪ Insulating the refrigerant piping