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