Refrigerant Piping Insulation; Connecting The Refrigerant Piping; About Connecting The Refrigerant Piping - Daikin FXFN50A2VEB Installer And User Reference Manual

17 | Piping installation
Refrigerant piping material

17.1.2 Refrigerant piping insulation

17.2 Connecting the refrigerant piping

17.2.1 About connecting the refrigerant piping

Installer and user reference guide
62
▪ Piping material: K65 copper-iron alloy (CuFe2P), maximum operating pressure =
120 bar
▪ Piping temper grade and thickness:
Outer diameter (Ø)
9.5 mm (3/8")
12.7 mm (1/2")
(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.
▪ 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
9.5 mm (3/8")
12.7 mm (1/2")
Ø Ø
i i
Ø Ø
p p
t
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.
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 indoor unit
▪ Connecting the refrigerant piping to the outdoor unit
▪ Insulating the refrigerant piping
▪ Keeping in mind the guidelines for:
- Brazing
- Using the stop valves
Temper grade
R420
(drawn)
) Insulation inner diameter
p
(Ø )
i
10~14 mm
14~16 mm
(a)
Thickness (t)
≥0.65 mm
≥0.85 mm
Insulation thickness (t)
≥10 mm
≥10 mm
FXFN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P677925-1 – 2021.07
Ø
t