Daikin EHVZ04S18EA6V, Installer'S Reference Manual

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8 | Piping installation
Installer reference guide
71
ERGA04~08EA + 08S18+23EA
Daikin Altherma 3 R F
4P629093-1A – 2021.11
▪ Piping length: See "7.1.3 Installation site requirements of the indoor unit" [
4
51].
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping connections: Only flare and brazed connections are allowed. The indoor
and outdoor units have flare connections. Connect both ends without brazing. If
brazing should be needed, take the guidelines in the installer reference guide
into account.
▪ Flare connections: Only use annealed material.
▪ Piping diameter:
Liquid piping Ø6.4 mm (1/4")
Gas piping Ø15.9 mm (5/8")
▪ Piping temper grade and thickness:
Outer diameter (Ø) Temper grade Thickness (t)
(a)
6.4 mm (1/4") Annealed (O) ≥0.8 mm
t
Ø
15.9 mm (5/8") Annealed (O) ≥1.0 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.
8.1.2 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)
6.4 mm (1/4") 8~10 mm 10 mm
15.9 mm (5/8") 16~20 mm 13 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.
8.2 Connecting the refrigerant piping
8.2.1 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 outdoor unit