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7.7 Refrigerant pipe fitting
7.7.1 Caution
1. Use the following materials for refrigerant piping.
• Material: Seamless phosphorous deoxidized copper pipe
• Wall thickness : Comply with the relevant local and national regulations for the designed pressure
3.8MPa. We recommend the following table as the minimum wall thickness.
Outer diameter
6.35
9.52
[mm]
Minimum
0.8
0.8
thickness [mm]
2. Commercially available piping often contains dust and other materials. Always blow it clean with a dry inert gas.
3. Use care to prevent dust, water or other contaminants from entering the piping during installation.
4. Reduce the number of bending portions as much as possible, and make bending radius as big as possible.
5. Always use the branch piping set shown below, which are sold separately.
Y branch
ARBLN01621
ARBLN07121
6. If the diameters of the branch piping of the designated refrigerant piping differs, use a pipe cutter to cut the connecting sec-
tion and then use an adapter for connecting different diameters to connect the piping.
7. Always observe the restrictions on the refrigerant piping (such as rated length, difference in height, and piping diameter).
Failure to do so can result in equipment failure or a decline in heating/cooling performance.
8. A second branch cannot be made after a header. (These are shown by
A
A
To Outside Unit
B
Sealed Piping
9. The system will stop due to an abnormality like excessive or insufficient refrigerant. At such a time, always properly charge
the unit. When servicing, always check the notes concerning both the piping length and the amount of additional refrigerant.
10. Never perform a pump down. This will not only damage the compressor but also deteriorate the performance.
11. Never use refrigerant to perform an air purge. Always evacuate using a vacuum pump.
12. Always insulate the piping properly. Insufficient insulation will result in a decline in heating/cooling performance, drip of con-
densate and other such problems.
13. When connecting the refrigerant piping, make sure the service valves of the outside unit is completely closed (the factory
setting) and do not operate it until the refrigerant piping for the outside and indoor units has been connected, a refrigerant
leakage test has been performed and the evacuation process has been completed.
14. Always use a non-oxidizing brazing material for brazing the parts and do not use flux. If not, oxidized film can cause clog-
ging or damage to the compressors and flux can harm the copper piping or refrigerant oil.
Installation
12.7
15.88
19.05
22.2
25.4
0.8
0.99
0.99
0.99
0.99
ARBLN03321
ARBLN14521
A
28.58
31.8
34.9
38.1
41.3
0.99
1.1
1.21
1.35
1.43
Header
4 branch
7 branch
ARBL054
ARBL057
ARBL104
ARBL107
.)
10 branch
ARBL1010
ARBL2010
B
32
32
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