7 | Piping installation
Installer reference guide
31
RXTJ-A_RXTA-C_RXTM-A_RXTP-A
R32 split series
4P728168-1 – 2023.03
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping................................................................................................................................................... 31
7.1.1 Refrigerant piping requirements ........................................................................................................................... 31
7.1.2 Refrigerant piping insulation.................................................................................................................................. 32
7.1.3 Refrigerant piping length and height difference ................................................................................................... 32
7.2 Connecting the refrigerant piping.......................................................................................................................................... 32
7.2.1 About connecting the refrigerant piping............................................................................................................... 33
7.2.2 Precautions when connecting the refrigerant piping............................................................................................ 33
7.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 34
7.2.4 Pipe bending guidelines ......................................................................................................................................... 35
7.2.5 To flare the pipe end.............................................................................................................................................. 35
7.2.6 Using the stop valve and service port.................................................................................................................... 36
7.2.7 To connect the refrigerant piping to the outdoor unit ......................................................................................... 37
7.3 Checking the refrigerant piping.............................................................................................................................................. 38
7.3.1 About checking the refrigerant piping................................................................................................................... 38
7.3.2 Precautions when checking the refrigerant piping ............................................................................................... 38
7.3.3 To check for leaks................................................................................................................................................... 39
7.3.4 To perform vacuum drying .................................................................................................................................... 39
7.1 Preparing refrigerant piping
7.1.1 Refrigerant piping requirements
CAUTION
Piping and joints of a split system shall be made with permanent joints when inside
an occupied space except joints directly connecting the piping to the indoor units.
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for refrigerant piping.
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[47].
▪ Foreign materials inside pipes (including oils for fabrication) must be
≤30mg/10m.
Refrigerant piping diameter
Pipe outer diameter (mm)
Liquid piping Gas piping
Ø6.4 Ø9.5
Refrigerant piping material
▪ Piping material: phosphoric acid deoxidised seamless copper
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness: