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Refrigerant Piping
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
Outer diameter
[mm]
Minimum
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.
ARBLN01620
ARBLN07120
6. If the diameters of the branch piping of the designated refrigerant piping differs, use a pipe cutter to cut
the connecting section 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 Outdoor Unit
B
Sealed Piping
9. The Multi V 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 use refrigerant to perform an air purge. Always evacuate using a vacuum pump.
11. Always insulate the piping properly. Insufficient insulation will result in a decline in heating/cooling
performance, drip of condensate and other such problems.
12. When connecting the refrigerant piping, make sure the service valves of the Outdoor Unit is completely
closed (the factory setting) and do not operate it until the refrigerant piping for the Outdoor and Indoor
Units has been connected, a refrigerant leakage test has been performed and the evacuation process
has been completed.
13. Always blow nitrogen into pipe which is brazed. Always use a non-oxidizing brazing material for brazing
the parts and do not use flux. If not, oxidized film can cause clogging or damage to the compressor unit
and flux can harm the copper piping or refrigerant oil.
20
Outdoor Unit
3.8MPa. We recommend the following table as the minimum wall thickness.
6.35
9.52
12.7
15.88
0.8
0.8
0.8
0.99
Y branch
ARBLN03320
ARBLN14520
19.05
22.2
25.4
28.58
0.99
0.99
0.99
0.99
4 branch
ARBL054
ARBL104
A
31.8
34.9
38.1
41.3
1.1
1.21
1.35
1.43
Header
7 branch
10 branch
ARBL057
ARBL1010
ARBL107
ARBL2010
.)
B
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