Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements - Daikin FXSN112A2VEB Installer And User Manual

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Piping installation

16 Piping installation
In this chapter

16.1 Preparing refrigerant piping

16.1.1 Refrigerant piping requirements

Refrigerant piping diameter
Refrigerant piping material
Installer and user reference guide
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16.1 Preparing refrigerant piping ...................................................................................................................................................
16.1.1 Refrigerant piping requirements ...........................................................................................................................
16.1.2 Refrigerant piping insulation..................................................................................................................................
16.2 Connecting the refrigerant piping..........................................................................................................................................
16.2.1 About connecting the refrigerant piping...............................................................................................................
16.2.2 Precautions when connecting the refrigerant piping............................................................................................
16.2.3 Pipe bending guidelines .........................................................................................................................................
16.2.4 Guidelines when connecting the refrigerant piping..............................................................................................
16.2.5 To connect the refrigerant piping to the indoor unit............................................................................................
INFORMATION
Also read the precautions and requirements in the "General safety precautions"
chapter.
NOTICE
The refrigerant R744 requires strict cautions for keeping the system clean, dry and
tight.
▪
Clean and dry: foreign materials (including mineral oils or moisture) should be
prevented from getting mixed into the system.
▪
Tight: R744 does not contain any chlorine, does not destroy the ozone layer, and
does not reduce earth's protection against harmful ultraviolet radiation. R744 can
contribute to the greenhouse effect if it is released. Therefore pay special
attention to check the tightness of the installation.
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
K65 copper-iron alloy tube system for high-pressure applications with a working
pressure of 120 bar.
▪ Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
Liquid piping
Ø9.5 mm
▪ Piping material: K65 copper-iron alloy (CuFe2P), maximum operating pressure =
120 bar
▪ Piping temper grade and thickness:
Outer diameter (Ø)
9.5 mm (3/8")
12.7 mm (1/2")
Gas piping
Ø12.7 mm
Temper grade Thickness (t)
R420
(drawn)
(a)
Ø
≥0.65 mm
≥0.85 mm
FXSN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P602817-1 - 2020.02
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t