Protection Against Contamination When Installing Pipes; Pipe Connection; Connecting The Refrigerant Piping; Figure - Daikin REYQ18PY1 Installation Manual

The minimum thickness of piping according to Japan's High-
Pressure Gas Safety Law (as of January 2003) is shown below.
Temper grade (O type, 1/2H type) in the table indicate the
material types specified in JIS H 3300.
(unit : mm)
Temper grade O type
φ6.4 φ9.5 φ12.7 φ15.9
outer diameter
smallest thickness 0.80 0.80
Temper grade
φ19.1 φ22.2 φ25.4 φ28.6 φ31.8 φ34.9 φ38.1 φ41.3
outer diameter
smallest thickness 0.80 0.80
• For piping work, follow the maximum tolerated length, difference
in height, and length after a branch indicated in the "6-5 Example
of connection".
• Outdoor unit multi connection piping kit and refrigerant branching
kit (sold separately) are needed for connection of piping between
outdoor units (in case of multi system) and piping branches.
Use only separately sold items selected specifically according to
the outdoor unit multi connection piping kit, the refrigerant branch-
ing kit selection in the "6-5 Example of connection".
6-2 Protection against contamination
when installing pipes
Protect the piping to prevent moisture, dirt, dust, etc. from
entering the piping.
Place Installation period
More than a month
Outdoor
Less than a month
Indoor Regardless of the period
Note
Exercise special caution to prevent dirt or dust when passing piping
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 compres-
sors 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 0.02 MPa (0.2kg/cm
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 interunit piping can be connected either forward or to
the sides (taken out through the bottom) as shown in the figure 10.
When passing out through the bottom, use the knock hole in the
bottom frame.
(Refer to figure 10)
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 6mm bit. (Refer to figure 11)
(Refer to figure 11)
1. Knock hole
(large : for liquid pipe, suction gas pipe and HP/LP gas pipe)
2. Knock hole (small : for equalizer pipe)
3. Drill
5
0.80 0.99
(unit : mm)
1/2H type
0.88 0.99 1.10 1.21 1.32
Protection method
Pinch the pipe
Pinch or tape the pipe
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 wir-
ing with a conduit or bushings, making sure not to damage the wiring.
2.
Removing Pinch Piping
• When connecting refrigerant piping to an outdoor unit, remove
the pinch piping using the procedure in the figure 12.
(Refer to figure 12)
• About handling of shutoff valves, refer to [Shutoff valve opera-
tion procedure] in "11-1 Before working".
Caution
1.43
After removing the gass, remove the pinch piping.
Any gas remaining inside may blow off the pinch piping when you dis-
solve the brazing, causing damage.
(Refer to figure 12)
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 outdoor units
• Figure 13 shows the example of connecting refrigerant piping to
outdoor units.
• The local interunit piping next accesorry pipes are field supplyed.
• About the detail of connecting pipes between outdoor units on
outdoor unit multi system, refer to the "4. Precautions when
connecting piping between outdoor units" and the installation
manual attached to the outdoor unit multi connection piping kit.
<In case of single system : 5-18HP type>
(Refer to figure 13)
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)
2
:
16. Liquid side accessory pipe (2)
17. Suction gas side accessory pipe (2)
18. In case of Q14 · 16 type : HP/LP gas side accessory pipe (2)
In case of Q8 ~ 12 type : HP/LP gas side accessory pipe (1)
19. Equalizer side accessory pipe (2)
Note
• Equalizer pipe is only for connection between outdoor units on
multi outdoor unit system.
That is not connect to indoor units.
• About the connection of equalizer pipe for 3 outdoor units multi
system, refer to the installation manula of outdoor unit multi con-
nection piping kit.
• 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 betweemn outdoor units
The Outdoor unit multi connection piping kit (sold separately) is
needed to connect piping between outdoor 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 outdoor 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 16-1)
Do not install vertically. (Refer to figure 16-2)
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