Daikin Altherma EVLQ05+08CA, Installer'S Reference Manual

Page: 44 / 252

6 | Preparation
Installer reference guide
44
EHYH EHYHBH/X08AF + EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1F – 2020.10
6.3 Preparing refrigerant piping
6.3.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "1 General safety
precautions" [ 4 6].
▪ 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
NOTICE
The unit is only to be used in a closed water system. Application in an open water
circuit can lead to excessive corrosion of the water piping.