Daikin VRVIII RXYQ-PR1, Руководство по установке

Страница: 10 / 32

Installation manual
5
RXYQ8~18P7W1BR1
VRVIII System air conditioner
4PW44039-1D
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
"6.6. Example of connection"
on page 7 .
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.
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.
2 Removing the pinched piping (See figure 7)
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 19.1 0.80
9.5 0.80 22.2 0.80
12.7 0.80 28.6 0.99
15.9 0.99
NOTE
The pressure regulator for the nitrogen released when
doing the brazing should be set to 0.02 MPa or less.
(See figure 11)
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
1 Refrigerant piping
2 Location to be brazed
3 Nitrogen
4 Taping
5 Manual valve
6 Regulator
1 Left-side connection
2 Front connection
3 Right-side connection
NOTE Precautions when knocking out knock holes
■
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.
Any gas or oil remaining inside the stop valve may
blow off the pinched piping. Failure to observe the
instructions in procedure below properly may result in
property damage or personal injury, which may be
serious depending on the circumstances.
Use the following procedure to remove the pinched
piping:
1. Remove the valve lid and make sure
that the stop valves are fully closed.
2. Connect a charge hose to service ports of all
stop valves.
3. Recover gas and oil from the pinched piping by
using a recovery unit.
4. When all gas and oil is recovered from the
pinched piping, disconnect the charge hose and
close the service ports.
5. In case the pinched piping lower parts looks like
detail A in
figure 7 , proceed with procedure
step 8.
In case the pinched piping lower part looks like
detail B in
figure 7 , follow instructions as per
procedure steps 6-7-8.
6. Cut off the lower part of the smaller pinched
piping with an appropriate tool (e.g. a pipe cutter,
a pair of nippers,...) so that a cross-section is
open allowing remaining oil to drip out in case the
recovery was not complete.
7. Wait until all oil is dripped out.
8. Dissolve the brazing using a burner and remove
the pinched piping or cut the pinched piping off
with a pipe cutter.
1 2 3
Do not vent gases into the
atmosphere.