GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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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)
Note:
(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 90m.
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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