Gree GMV5E Series Service Manual page 44

GREE
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.
R410A Refrigerant System
Total length (actual length) of fitting pipe
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.
Outdoor Model
GMV-224WM/E-X
GMV-280WM/E1-X
GMV-280WM/E-X
GMV-335WM/E-X
GMV-400WM/E-X
GMV-450WM/E1-X
GMV-450WM/E-X
GMV-504WM/E-X
GMV-560WM/E-X
GMV-615WM/E-X
GMV-680WM/E-X
GMV-730WM/E-X
GMV-785WM/E-X
GMV-850WM/E-X
GMV-900WM/E-X
GMV-960WM/E-X
GMV-1010WM/E-X
GMV-1065WM/E-X
GMV-1130WM/E-X
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
Actual length
Equivalent length
Outdoor unit at upper(4)
Outdoor unit at lower(4)
Gas pipe size(mm)
No need to enlarge pipe size
No need to enlarge pipe size
No need to enlarge pipe size
Φ28.6
Φ28.6
Φ31.8
Φ31.8
Φ31.8
Φ31.8
Φ31.8
Φ31.8
Φ38.1
Φ38.1
Φ38.1
Φ38.1
Φ38.1
Φ41.3
Φ41.3
Φ41.3
40
Allowable
Fitting Pipe
Value
≤1000 L1+L2+L3+L4+...+L9+a+b+...+i+j
≤165
L1+L6+L7+L8+L9+j
≤190
≤40
≤40
L6+L7+L8+L9+j
≤90
≤90
≤30
<90
≤40
a,b,c,d,e,f,g,h,i,j
Liquid pipe size(mm)
No need to enlarge pipe size
Φ12.7
Φ12.7
Φ15.9
Φ15.9
Φ15.9
Φ15.9
Φ19.05
Φ19.05
Φ19.05
Φ19.05
Φ22.2
Φ22.2
Φ22.2
Φ22.2
Φ22.2
Φ22.2
Φ22.2
Φ22.2
L10-L11
——
——
——
L1