7
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Piping installation
Installer reference guide
33
4MWXM-A
R32 Split series
4P678385-1A – 2022.02
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping
7.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the
7].
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
≤30 mg/10 m.
Refrigerant piping diameter
Liquid piping
Gas piping
4× Ø6.4 mm (1/4")
2× Ø9.5 mm (3/8")
2× Ø12.7 mm (1/2")
INFORMATION
Usage of reducers might be required based on the indoor unit. See
"7.2.6 Connections between outdoor and indoor unit using reducers"
38] for
more information.
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