17
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Piping installation
Installer and user reference guide
60
FXHA-A
VRV system air conditioner
4P673749-1A – 2022.11
17 Piping installation
In this chapter
17.1 Preparing refrigerant piping
17.1.1 Refrigerant piping requirements
CAUTION
Piping MUST be installed according to instructions given in
60]. Only mechanical joints (e.g. braze+flare connections) that are
compliant with the latest version of ISO14903 can be used.
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
▪
Foreign materials inside pipes (including oils for fabrication) must be
≤30 mg/10 m.
Refrigerant piping diameter
For piping connections of the indoor unit, use the following piping diameters:
Class
Pipe outer diameter (mm)
Liquid pipe
Gas pipe
32
Ø6.4
Ø9.5
50+63
Ø6.4
Ø12.7
100
Ø9.5
Ø15.9
Refrigerant piping material
▪
Piping material:
phosphoric acid deoxidised seamless copper
▪
Flare connections:
Only use annealed material.
▪
Piping temper grade and thickness:
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