7 | Piping installation
Installer reference guide
32
RXTM-R_RXTP-R_ARXTP-R_RXTA-B
R32 split series
4P518023-11H – 2021.03
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping................................................................................................................................................... 32
7.1.1 Refrigerant piping requirements ........................................................................................................................... 32
7.1.2 Refrigerant piping insulation.................................................................................................................................. 33
7.1.3 Refrigerant piping length and height difference ................................................................................................... 33
7.2 Connecting the refrigerant piping.......................................................................................................................................... 33
7.2.1 About connecting the refrigerant piping............................................................................................................... 33
7.2.2 Precautions when connecting the refrigerant piping............................................................................................ 34
7.2.3 Guidelines when connecting the refrigerant piping.............................................................................................. 35
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.................................................................................................................... 36
7.2.7 To connect the refrigerant piping to the outdoor unit ......................................................................................... 38
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 ............................................................................................... 39
7.3.3 To check for leaks................................................................................................................................................... 39
7.3.4 To perform vacuum drying .................................................................................................................................... 40
7.1 Preparing refrigerant piping
7.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the "2 General safety
precautions"[47].
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.
▪ Foreign materials inside pipes (including oils for fabrication) must be
≤30mg/10m.
Refrigerant piping diameter
Liquid piping Gas piping
Ø6.4mm Ø9.5mm
Refrigerant piping material
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness:
Outer diameter (Ø) Temper grade Thickness (t)
(a)
6.4mm (1/4") Annealed (O) ≥0.8mm
9.5mm (3/8") Annealed (O)
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