7
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Piping installation
Installer reference guide
35
C FVXM25~50A
Split system air conditioners
4P625991-1C – 2021.09
7 Piping installation
In this chapter
7.1 Preparing refrigerant piping
7.1.1 Refrigerant piping requirements
INFORMATION
Also read the precautions and requirements in the
5].
NOTICE
The piping and other pressure-containing parts shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for refrigerant.
INFORMATION
Additional refrigerant charge is NOT allowed in case of combination of the outdoor
unit
3MXM40N8
or
3MXM52N8
with the indoor units
CVXM-A
and/or
FVXM-A
. The
total piping length MUST be ≤30 m.
▪
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 piping
Gas piping
20~35
Ø6.4
Ø9.5
50
Ø6.4
Ø12.7
Refrigerant piping material
▪
Piping material:
Phosphoric acid deoxidised seamless copper.
▪
Piping temper grade and thickness:
Outer diameter (Ø)
Temper grade
Thickness (t)
(a)
6.4 mm (1/4")
Annealed (O)
≥0.8 mm
t
Ø
9.5 mm (3/8")
12.7 mm (1/2")
Содержание Perfera CVXM20A3V1B
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