Gree Ultra Heat GMV-V72W/A-F, Service Manual, Page: 42 / 240

Ultra Heat GMV VRF Technical Service Manual INSTALLATION
37
Under the following conditions, the length can reach 90m (295-1/4feet).
1) Actual length of pipe in total: L1+L2
×
2+L3
×
2+L4
×
2
+…+L9
×
2+a+b
+…+i+j≤1000m (3280-
3/4feet).
2) Length between each IDU and its nearest branch a, b, c, d, e, f, g, h, i, j
≤40m (131- 1/4feet).
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 (131-1/4feet).
(2) When the outdoor unit is at upper side and height difference is more than 50m, please consult
company for the related technical requirement.
(3) When the maximum length of the main pipe from ODU to the first branch of IDU is
≥
90m
(295-1/4ft), then adjust the pipe size.
Total rated capacity of ODU: C
(Btu/h)
Pipe between outdoor unit and the first indoor branch
Gas pipe mm(inch) Liquid pipe mm(inch)
C
≤72000
No need to enlarge pipe size No need to enlarge pipe size
72000
＜ X≤96000
No need to enlarge pipe size
Φ12.7(1/2)
96000
＜
X≤120000
No need to enlarge pipe size
Φ15.9(5/8)
(4) If the length between an IDU and its nearest branch is above 10m (32-4/5feet), then increase the
size of the liquid pipe of IDU (only
for the pipe size that is≤6.35mm (1/4inch).
4 FITTING PIPE BETWEEN ODU AND THE FIRST MANIFOLD
Size requirement for branch pipe and piping (main pipe)
(1) Connection sketch map of single-module system
(a)