17
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Piping installation
Installer and user reference guide
49
FXMQ-A
VRV system air conditioner
4P701548-1 – 2022.07
17 Piping installation
In this chapter
17.1 Preparing refrigerant piping
17.1.1 Refrigerant piping requirements
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
6].
▪
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:
Pipe outer diameter (mm)
Class
Liquid pipe
Gas pipe
200
Ø9.5 mm
Ø19.1 mm
250
Ø9.5 mm
Ø22.2 mm
Refrigerant piping material
▪
Piping material:
phosphoric acid deoxidised seamless copper
▪
Flare connections:
Only use annealed material.
▪
Piping temper grade and thickness:
Outer diameter (Ø)
Temper grade
Thickness (t)
(a)
9.5 mm (3/8")
Annealed (O)
≥0.8 mm
t
Ø
19.1 mm (3/4")
22.2 mm (7/8")
(a)
Depending on the applicable legislation and the maximum working pressure of the unit
(see "PS High" on the unit name plate), larger piping thickness might be required.