Daikin EHYHBH05AFV32 [44/252] Preparing refrigerant piping

6 | Preparation

Installer reference guide

EVLQ05+08CAV3 + EHYHBH05AF + 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

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

) Insulation inner diameter

(Ø

)

Insulation thickness (t)

6.4mm (1/4") 8~10mm 10mm

15.9mm (5/8") 16~20mm 13mm

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.