Daikin RXP20N5V1B9, Руководство по установке для специалистов, Страница: 33 / 64

7 | Piping installation
Installer reference guide
33
R32 split series
4P751614-2 – 2023.09
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping ................................................................................................................................................... 33
7.1.1 Refrigerant piping requirements ........................................................................................................................... 33
7.1.2 Refrigerant piping length and height difference ................................................................................................... 33
7.1.3 Refrigerant piping insulation.................................................................................................................................. 34
7.2 Connecting the refrigerant piping.......................................................................................................................................... 34
7.2.1 About connecting the refrigerant piping............................................................................................................... 34
7.2.2 Precautions when connecting the refrigerant piping............................................................................................ 34
7.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 36
7.2.4 Pipe bending guidelines ......................................................................................................................................... 36
7.2.5 To flare the pipe end.............................................................................................................................................. 36
7.2.6 Using the stop valve and service port.................................................................................................................... 37
7.2.7 To connect the refrigerant piping to the outdoor unit ......................................................................................... 38
7.3 Checking the refrigerant piping.............................................................................................................................................. 39
7.3.1 About checking the refrigerant piping................................................................................................................... 39
7.3.2 Precautions when checking the refrigerant piping ............................................................................................... 39
7.3.3 To check for leaks................................................................................................................................................... 40
7.3.4 To perform vacuum drying .................................................................................................................................... 40
7.4 Charging refrigerant ............................................................................................................................................................... 41
7.4.1 About charging refrigerant .................................................................................................................................... 41
7.4.2 About the refrigerant ............................................................................................................................................. 42
7.4.3 Precautions when charging refrigerant ................................................................................................................. 43
7.4.4 To determine the additional refrigerant amount.................................................................................................. 43
7.4.5 To determine the complete recharge amount...................................................................................................... 43
7.4.6 To charge additional refrigerant ............................................................................................................................ 44
7.4.7 To fix the fluorinated greenhouse gases label....................................................................................................... 44
7.1 Preparing refrigerant piping
7.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions" [
4
6].
▪ Piping material: phosphoric acid deoxidised seamless copper
▪ Piping diameter:
Liquid piping Gas piping
Ø6.4 mm (1/4") 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 length and height difference
What? Distance
Maximum allowable pipe length 20 m