Daikin 2MXM50N2V1B9 - Piping Installation; Preparing Refrigerant Piping

7 | Piping installation
Installer reference guide
33
2(A)MXM40+50 + 2(A)MXF40+50
R32 Split series
4P600463-3D – 2021.03
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping................................................................................................................................................... 33
7.1.1 Refrigerant piping requirements ........................................................................................................................... 33
7.1.2 Refrigerant piping insulation.................................................................................................................................. 34
7.1.3 Refrigerant piping length and height difference ................................................................................................... 34
7.2 Connecting the refrigerant piping.......................................................................................................................................... 35
7.2.1 About connecting the refrigerant piping............................................................................................................... 35
7.2.2 Precautions when connecting the refrigerant piping............................................................................................ 35
7.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 36
7.2.4 Pipe bending guidelines ......................................................................................................................................... 37
7.2.5 To flare the pipe end.............................................................................................................................................. 37
7.2.6 Connections between outdoor and indoor unit using reducers........................................................................... 38
7.2.7 Using the stop valve and service port.................................................................................................................... 39
7.2.8 To connect the refrigerant piping to the outdoor unit ......................................................................................... 41
7.3 Checking the refrigerant piping.............................................................................................................................................. 41
7.3.1 About checking the refrigerant piping................................................................................................................... 41
7.3.2 Precautions when checking the refrigerant piping ............................................................................................... 42
7.3.3 To check for leaks................................................................................................................................................... 42
7.3.4 To perform vacuum drying .................................................................................................................................... 43
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5].
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for refrigerant.
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Piping diameter:
Class 40
Liquid piping 2× Ø6.4mm (1/4")
Gas piping 2× Ø9.5mm (3/8")
Class 50
Liquid piping 2× Ø6.4mm (1/4")
Gas piping 1× Ø9.5mm (3/8")
1× Ø12.7mm (1/2")
▪ 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")
12.7mm (1/2")