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6.2.
Selection of piping material
1.
Foreign materials inside pipes (including oils for fabrication)
must be 30 mg/10 m or less.
2.
Use the following material specification for refrigerant piping:
■ Size: determine the proper size referring to chapter
"6.6. Example of connection" on page
■ Construction material: phosphoric acid deoxidized seamless
copper for refrigerant.
■ Temper grade: use piping with temper grade in function of the
pipe diameter as listed in the table below.
Pipe Ø
≤15.9
≥19.1
O = Annealed
1/2H = Half hard
■ The pipe thickness of the refrigerant piping should comply
with relevant local and national regulations. The minimal pipe
thickness for R410A piping must be in accordance with the
table below.
Minimal thickness
Pipe Ø
t (mm)
6.4
0.80
9.5
0.80
12.7
0.80
15.9
0.99
3.
Make sure to use the particular branches of piping that have
been selected referring to chapter
on page
8.
4.
In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the
following into account:
■ select the pipe size nearest to the required size.
■ use the suitable adapters for the change-over from inch to
mm pipes (field supply).
6.3.
Pipe connection
Be sure to perform a nitrogen blow when brazing and to read the
paragraph
"Caution to be taken when brazing refrigerant piping" on
page 4
first.
NOTE
The pressure regulator for the nitrogen released when
doing the brazing should be set to 0.02 MPa or less.
(See figure 11)
1
Refrigerant piping
2
Location to be brazed
3
Nitrogen
4
Taping
5
Manual valve
6
Regulator
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
Installation manual
5
8.
Temper grade of piping material
O
1/2H
Minimal thickness
Pipe Ø
t (mm)
19.1
0.80
22.2
0.80
28.6
0.99
"6.6. Example of connection"
6.4.
Connecting the refrigerant piping
1
Front connection or side connection
Installation of refrigerant piping is possible as front connection or
side connection (when taken out from the bottom) as shown in
the figure.
1
2
1
Left-side connection
2
Front connection
3
Right-side connection
Precautions when knocking out knock holes
NOTE
■
Be sure to avoid damaging the casing
■
After knocking out the holes, we recommend you
remove the burrs and paint the edges and areas
around the edges using the repair paint to prevent
rusting.
■
When passing electrical wiring through the knock
holes, wrap the wiring with protective tape to
prevent damage.
3
RXYQ8~18P7W1BR1
VRVIII System air conditioner
4PW44039-1E – 07.2010
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