Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements - Daikin CVXM20A2V1B Installer's Reference Manual

7 Piping installation

In this chapter

7.1 Preparing refrigerant piping

7.1.1 Refrigerant piping requirements

Refrigerant piping diameter
Refrigerant piping material
CVXM20+FVXM25~50A2V1B
Split system air conditioners
4P625991-1 - 2020.06
7.1 Preparing refrigerant piping ...................................................................................................................................................
7.1.1 Refrigerant piping requirements ...........................................................................................................................
7.1.2 Refrigerant piping insulation..................................................................................................................................
7.2 Connecting the refrigerant piping..........................................................................................................................................
7.2.1 About connecting the refrigerant piping...............................................................................................................
7.2.2 Precautions when connecting the refrigerant piping............................................................................................
7.2.3 Guidelines when connecting the refrigerant piping..............................................................................................
7.2.4 Pipe bending guidelines .........................................................................................................................................
7.2.5 To flare the pipe end..............................................................................................................................................
7.2.6 To connect the refrigerant piping to the indoor unit............................................................................................
INFORMATION
Also read the precautions and requirements in the
precautions" [ 4
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for refrigerant.
▪ Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
Use the same diameters as the connections on the outdoor units:
Class
25+35
50
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping temper grade and thickness:
Outer diameter (Ø)
6.4 mm (1/4")
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.
5].
Pipe outer diameter (mm)
Liquid piping
Ø6.4
Ø6.4
Temper grade
Annealed (O)
7 Piping installation
|
"2 General safety
Gas piping
Ø9.5
Ø12.7
(a)
Thickness (t)
≥0.8 mm
Installer reference guide
35
35
36
36
36
36
37
38
38
39
Ø
t
35