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Piping installation
Installer reference guide
31
CTXM-A, FTXM-A, ATXM-A
Daikin room air conditioner
4P518023-17P – 2023.06
7 Piping installation
In this chapter
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
7].
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Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
Refrigerant piping diameter
Use the same diameters as the connections on the outdoor units:
Class
Pipe outer diameter (mm)
Liquid pipe
Gas pipe
15~42
Ø6.4
Ø9.5
50
Ø6.4
Ø12.7
Refrigerant piping material
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Piping material:
phosphoric acid deoxidised seamless copper
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Flare connections:
Only use annealed material.
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Piping temper grade and thickness: