Daikin RXYQ120PYDNR [83/108] 2 protection against contamination when installing pipes
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Daikin RXYQ120PYDNR [83/108] 2 protection against contamination when installing pipes

Daikin RXYQ120PYDNR [83/108] 2 protection against contamination when installing pipes
Installation EDUS391000-N_a
82 Installation of Outdoor Units
6-2 Protection against contamination
when installing pipes
Protect the piping to prevent moisture, dirt, dust, etc. from
entering the piping.
NOTE
Exercise special caution to prevent dirt or dust when passing pip-
ing through holes in walls and when passing pipe edges to the
exterior.
6-3 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.
6-4 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 φ-1/4”-bit. (Refer to figure 10)
(Refer to figure 10)
1. Knock hole
(large : for liquid pipe, suction gas pipe and HP/LP gas pipe)
2. Knock hole (small : for equalizer pipe)
3. Drill
4. Concave section (4 points)
• Be sure to avoid damaging the casing.
• After knocking out the holes, we recommend you 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 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. 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. Suction gas pipe shutoff valve
7. HP/LP gas pipe shutoff valve
8. Equalizer pipe shutoff valve
9. Brazing
10. Liquid side accessory pipe (1)
11. Suction gas side accessory pipe (1)
12. HP/LP gas side accessory pipe (1)
13. Equalizer side accessory pipe (1)
14. L type accessory joint (1)
15. L type accessory joint (2)
16. Liquid side accessory pipe (2)
17. Suction gas side accessory pipe (2)
18. HP/LP gas side accessory pipe (1)
19. Equalizer side accessory pipe (2)
• 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)
• Maintain a straight portion of 19-5/8 in. or more until the split
of the joint without wrapping any onsite piping around this
area.
Over 19-5/8 in. of straight area can be maintained by con-
necting at least 4-3/4 in. of onsite pipe (straight) to the joint.
(Refer to figure 13-3)
Place Installation period Protection method
Outdoor
More than a month Pinch the pipe
Less than a month
Pinch or tape the pipe
Indoor Regardless of the period

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