D.C. Inverter Multi VRF Modular
18
L10: Length from the first branch to the farthest IDU;
L11: Length from the first branch to the nearest IDU;
Equivalent length of branch of IDU is 0.5m
Total length (actual length) of fitting pipe
L1+L2+L3+L4+…+L9+a+b+…+i+j
Length of farthest fitting
pipe(m)
Difference between the pipe length from the first branch
of IDU to the farthest IDU and the pipe length from the
first branch of IDU to the nearest IDU
Equivalent length from the first branch to the furthest
piping (1)
Height difference between
outdoor unit and indoor
unit
Height difference between indoor units (m)
Maximum length of Main pipe(2)
From IDU to its nearest branch (3)
Notices:
(1)Normally, the pipe length from the first branch of IDU to the farthest IDU is 40m. When
those three conditions as below are satisfied, the length can reached 90cm.
1) Actual length of pipe in total: L1+L2x2+L3x2+L4x2+…+L9x2+a+b+…+i+j≤1000m;
2) Length between each IDU and its nearest branch a, b, c, d, e, f, g, h, i, j≤40m;
3) Difference between the pipe length from the first branch of IDU to the farthest IDU and
the pipe length from the first branch of IDU to the nearest IDU: L10-L11≤40m.
(2) When the maximum length of the main pipe from ODU to the first branch of IDU is≥90m,
then adjust the pipe size of the gas pipe and liquid pipe of main pipe according to the
following table.
No need to enlarge pipe size
No need to enlarge pipe size
No need to enlarge pipe size
No need to enlarge pipe size
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