Daikin RXYQ96PATJ [41/108] 3 pipe connection
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Daikin RXYQ96PATJ [41/108] 3 pipe connection

Daikin RXYQ96PATJ [41/108] 3 pipe connection
Installation EDUS391000-N_a
40 Installation of Outdoor Units
7-3 Pipe connection
• Be sure to perform nitrogen permutation or nitrogen blow when
brazing. (Refer to figure 8)
Brazing without performing nitrogen permutation or nitrogen
blow into the piping will create large quantities of oxidized film
on the inside of the pipes, adversely affecting valves and com-
pressors in the refrigerating system and preventing normal
operation.
(Refer to figure 8)
1. Refrigerant pipe
2. Location to be brazed
3. Nitrogen
4. Taping
5. Handy valve
6. Regulator
• The pressure regulator for the nitrogen released when doing
the brazing should be set to about 2.9 psi (Enough to feel a
slight breeze on your cheek).
NOTE
Do not use anti-oxidants when brazing the pipe joints.
Residue can clog pipes and break equipment.
7-4 Connecting the refrigerant piping
1. Direction to bring out the pipes
The local inter unit piping can be connected either forward or to the
sides (taken out through the bottom) as shown in the figure 9.
When passing out through the bottom, use the knock hole in the
bottom frame.
(Refer to figure 9)
1. Left-side connection
2. Front connection
3. Right-side connection
Precautions when knocking out knock holes
• Open knock hole (large, small) in the base frame by drilling the 4
concave around it with a φ1/4”-bit. (Refer to figure 10)
(Refer to figure 10)
1. Knock hole (large : for liquid pipe, gas pipe and low side
equalizer pipe)
2. Knock hole (small : for high side equalizer pipe)
3. Drill
4. Concave section (4 points)
• Be sure to avoid damaging the casing.
• After knocking out the holes, we recommend you to remove any
burrs and paint them using the repair paint to prevent rusting.
• When passing electrical wiring through the knock holes, protect
the wiring with a conduit or bushings, making sure not to damage
the wiring.
2. Removing Pinch Piping
• When connecting refrigerant piping to an outside unit, remove
the pinch piping using the procedure in the figure 11.
(Refer to figure 11)
• About handling of shutoff valves, refer to [Shutoff valve opera-
tion procedure] in “11-1 Before working”.
CAUTION
After removing the gass, remove the pinch piping.
Any gas remaining inside may blow off the pinch piping when you
dissolve the brazing, causing damage.
(Refer to figure 11)
1. Pich piping (4 pieces)
2. Do not remove the relay piping.
3. Pinch piping
4. Procedure 1 : Confirm the shutoff valve is closed.
5. Procedure 2 : Connect a charge hose to the service port
of shutoff valve and remove the gas in the pinch piping.
6. Procedure 3 : After removing the gas in the pinch piping,
dissolve the brazing using a burner and remove the pinch
piping.
3. Connecting refrigerant piping to outside units
• Figure 12-1, 2 shows the example of connecting refrigerant piping
to outside units.
• The local inter unit piping next accesorry pipes are field supplyed.
• About the detail of connecting pipes between outside units on
outside unit multi system, refer to the “4. Precautions when
connecting piping between outside units” and the installation
manual attached to the outside unit multi connection piping kit.
(Refer to figure 12-1)
1. When connected to the front
2. When connected at lateral side (bottom)
3. Remove the shutoff valve cover to connect.
4. Remove the knock hole on the bottom frame and route
the piping under the bottom frame.
5. Liquid pipe shutoff valve
6. Low side equalizer pipe shutoff valve
7. Gas pipe shutoff valve
8. High side equalizer pipe shutoff valve
9. Brazing
10. Liquid side accessory pipe (1)
11. Low side equalizer accessory pipe (1)
12. Gas side accessory pipe (1)
13. High side equalizer accessory pipe (1)
14. L type accessory joint (1)
15. L type accessory joint (2)
16. Liquid side accessory pipe (2)
17. Low side equalizer accessory pipe (2)
18. Gas side accessory pipe (1)
19. High side equalizer accessory pipe (2)
20. Installation for multi system
(Refer to figure 12-2)
1. When connected to the front
2. When connected at lateral side (bottom)
3. Remove the shutoff valve cover to connect.
4. Remove the knock hole on the bottom frame and route
the piping under the bottom frame.
5. Liquid pipe shutoff valve
6. Gas pipe shutoff valve
7. Brazing
8. Liquid side accessory pipe (1)
9. Gas side accessory pipe (1)
10. L type accessory joint (2)
11. Liquid side accessory pipe (2)
12. Gas side accessory pipe (1)
13. Installation for single unit system
• Equalizer pipe is only for connection between outside units on
multi outside unit system.
That does not connect to indoor units.
• Make sure the onsite piping does not come into contact with other
piping or the bottom frame or side panels of the unit.
4. Precautions when connecting piping between outside units
The Outside unit multi connection piping kit (sold separately) is
needed to connect piping between outside units in multi system.
Only proceed with piping work after considering the limitations on
installation listed here and in “5. Branching the refrigerant pip-
ing”, always referring to the kit’s installation manual.
(1) About outside unit multi connection piping kit
• Install the joint horizontally so that the attached warning label
faces strait up, and the tilt is within ±15°. (Refer to figure 13-1)
Do not install vertically. (Refer to figure 13-2)

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