Daikin Altherma EHYHBH05A Series, Installer'S Reference Manual

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8 | Piping installation
Installer reference guide
85
08CA + EHY EHYHBH/X08A + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1G – 2022.09
▪ Piping material: phosphoric acid deoxidised seamless copper
▪ 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
▪ Connecting the refrigerant piping to the indoor unit
▪ Insulating the refrigerant piping