7
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Piping installation
Installer reference guide
33
4 35 35
3 RXTA30N2V1B
R32 split series
4P518023-7H – 2020.08
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping
7.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the
5].
▪
Piping material:
Phosphoric acid deoxidised seamless copper.
▪
Piping diameter:
Liquid piping
Ø6.4 mm (1/4")
Gas piping
Ø9.5 mm (3/8")
▪
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
9.5 mm (3/8")
Annealed (O)
(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.
7.1.2 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
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