Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements; Refrigerant Piping Material - Daikin RXYSA4A7V1B Installer And User Manual

18 Piping installation

In this chapter

18.1 Preparing refrigerant piping

18.1.1 Refrigerant piping requirements

18.1.2 Refrigerant piping material

RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1A - 2020.07
18.1 Preparing refrigerant piping ...................................................................................................................................................
18.1.1 Refrigerant piping requirements ...........................................................................................................................
18.1.2 Refrigerant piping material ....................................................................................................................................
18.1.3 To select the piping size .........................................................................................................................................
18.1.4 To select refrigerant branch kits............................................................................................................................
18.1.5 Refrigerant piping length and height difference ...................................................................................................
18.2 Connecting the refrigerant piping..........................................................................................................................................
18.2.1 About connecting the refrigerant piping...............................................................................................................
18.2.2 Precautions when connecting the refrigerant piping............................................................................................
18.2.3 Pipe bending guidelines .........................................................................................................................................
18.2.4 To braze the pipe end ............................................................................................................................................
18.2.5 Using the stop valve and service port....................................................................................................................
18.2.6 To remove the spun pipes .....................................................................................................................................
18.2.7 To connect the refrigerant piping to the outdoor unit .........................................................................................
18.2.8 To connect the refrigerant branching kit ..............................................................................................................
18.3 Checking the refrigerant piping..............................................................................................................................................
18.3.1 About checking the refrigerant piping...................................................................................................................
18.3.2 Checking refrigerant piping: General guidelines ...................................................................................................
18.3.3 Checking refrigerant piping: Setup ........................................................................................................................
18.3.4 To perform a leak test............................................................................................................................................
18.3.5 To perform vacuum drying ....................................................................................................................................
INFORMATION
Also read the precautions and requirements in the "General safety precautions"
chapter.
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.
▪ Piping material: Phosphoric acid deoxidised seamless copper.
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness:
Outer diameter (Ø)
6.4 mm (1/4")
9.5 mm (3/8")
12.7 mm (1/2")
15.9 mm (5/8")
19.1 mm (3/4")
Temper grade
Annealed (O) ≥0.80 mm
Annealed (O) ≥0.99 mm
Half hard (1/2H) ≥0.80 mm
18 Piping installation
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