REYQ8~16P8Y1B
VRVIII System air conditioner
4PW39996-1A
Installation manual
5
6.1.
Installation tools
Make sure to use installation tools (gauge manifold charge hose,
etc.) that are exclusively used for R410A installations to withstand the
pressure and to prevent foreign materials (e.g. mineral oils such as
SUNISO and moisture) from mixing into the system.
(The screw specifications differ for R410A and R407C.)
Use a 2-stage vacuum pump with a non-return valve which can
evacuate to –100.7 kPa (5 Torr, –755 mm Hg).
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 7
■
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.
■
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.
3.
Make sure to use the particular branches of piping that have
been selected referring to chapter
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
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
NOTE
Make sure the pump oil does not flow oppositely into
the system while the pump is not working.
Pipe Ø
Temper grade of piping material
≤
15.9
O
≥
19.1
1/2H
O = Annealed
1/2H = Half hard
Pipe Ø
Minimal thickness
t (mm)
Pipe Ø
Minimal thickness
t (mm)
6.4
0.80
22.2
0.80
9.5
0.80
28.6
0.99
12.7
0.80
34.9
1.21
15.9
0.99
41.3
1.43
19.1
0.80
NOTE
The pressure regulator for the nitrogen released when
doing the brazing should be set to 0.02 MPa or less.
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
1
Left-side connection
2
Front connection
3
Right-side connection
NOTE
Precautions when knocking out knockout
holes
■
Be sure to avoid damaging the casing
■
After knocking out the knockout holes, we
recommend you remove the burrs and paint
the edges and areas around the edges using
repair paint to prevent rusting.
■
When passing electrical wiring through the
knockout holes, wrap the wiring with
protective tape to prevent damage as shown
in
1
Refrigerant piping
2
Location to be brazed
3
Nitrogen
4
Taping
5
Manual valve
6
Regulator
7
Nitrogen
1
Large knockout hole
2
Drill
3
Points for drilling
