Daikin Altherma EHBH08DA6V7 - 6.3 Preparing refrigerant piping; 6.3.1 Refrigerant piping requirements; 6.3.2 Refrigerant piping insulation; 6.4 Preparing water piping

6 | Preparation
Installer reference guide
56
ERGA04~08DAV3(A) + EHBH/X04+08DA*V7
Daikin Altherma 3 R W
4P618958-1 – 2020.03
6.3 Preparing refrigerant piping
6.3.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "General safety precautions"
chapter.
▪ 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.
6.3.2 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.
6.4 Preparing water piping
▪ Valve towards expansion vessel. The valve towards the expansion vessel (if
equipped) MUST be open.