Daikin RXYQ30PY1 [260/487] Refrigerant piping

Daikin RXYQ30PY1 [260/487] Refrigerant piping
Refrigerant Piping ED34-645B
652 Installation of Outdoor Units
6. Refrigerant Piping
All field piping must be installed by a licensed refrigeration technician and must comply with relevant local and
national regulations.
After piping work is complete, do not under any circumstances open the shutoff valve until “7. Field Wiring” and
“10. Checking of Device and Installation Conditions” are complete.
Do not use flux when brazing the refrigerant piping. Use the phosphor copper brazing filler metal (BCuP-2: JIS Z
3264/B-Cu93P-710/795: ISO 3677) which does not require flux.
(Flux has extremely harmful influence on refrigerant piping systems. For instance, if the chlorine based flux is
used, it will cause pipe corrosion or, in particular, if the flux contains fluorine, it will damage the refrigerant oil.)
6.1 Selection of Piping Material and Refrigerant Branching Kit
Use only pipes which are clean inside and outside and which do not accumulate harmful sulfur, oxidants, dirt,
cutting oils, moisture, or other contamination. (Foreign materials inside pipes including oils for fabrication must be
30mg/10m or less.)
Use the following items for the refrigerant piping.
Material: Jointless phosphor-deoxidized copper pipe
Size: See “6-5 Example of Connection” to determine the correct size.
Thickness: Select a thickness for the refrigerant piping which complies with national and local laws.
For R-410A, the design pressure is 4.0 MPa (40-bar).
The minimum thickness of piping according to Japan’s High-Pressure Gas Safety Law (as of January 2003) is
shown below.
Types (O type, 1/2H type) in the table indicate the material types specifiesd in JIS H 3300.
For piping work, follow the maximum tolerated length, difference in height, and length after a branch indicated in
the “6-5 Example of connection”.
A refrigerant branching kit (sold separately) is needed for piping branches and connection of piping between
outdoor unit (in case of multi system).
Use only separately sold items selected specifically according to the refrigerant branch 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.
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 next figure)
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 compressors in the refrigerating system
and preventing normal operation.
(unit: mm)
Temper grade O type
outer diameter
φ
6.4
φ
9.5
φ
12.7
φ
15.9
smallest thickness 0.80 0.80 0.80 0.99
(unit: mm)
Temper grade 1/2H type
outer diameter
φ
19.1
φ
22.2
φ
25.4
φ
28.6
φ
31.8
φ
34.9
φ
38.1
φ
41.3
smallest thickness 0.80 0.80 0.88 0.99 1.10 1.21 1.32 1.43
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
Note
Note

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