Samsung VRF DVM S Water Technical Data Book page 49

10. Installation
Selecting refrigerant pipe
Y-joint
Increase the
main pipe
size
▶ Install the refrigerant pipe according to main pipe size of each outdoor unit capacity.
▶ When the pipe length (including elbow) between the outdoor unit and the farthest indoor unit exceeds 90m, the
size of the pipe (main pipe) connecting the outdoor unit to the first branch joint must be increased by one grade.
▶ For HR System, when the pipe length (including elbow) between an outdoor unit and the farthest indoor unit
exceeds 90 m, you must increase the size of the liquid pipe by one grade among the pipes(main pipe) which
connects between the outdoor unit to the first branch joint
Main pipe size (Outer diameter, mm)
If total pipe length is less than 90 m
Note1) If Ø 25.40 pipe is not available on site, use Ø 28.58 pipe.
Note2) If Ø 31.75 pipe is not available on site, use Ø 34.92 pipe.
Note3) If Ø 38.10 pipe is not available on site, use Ø 41.28 pipe
9.52
12.70
15.88
19.05
22.22
28.58
34.92
41.28
Main pipe size (Outer diameter, mm)
If total pipe length is 90 m or longer
12.70
15.88
19.05
22.22
note1)
25.40
31.75
note2)
38.10
note3)
53.98
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