Gree Ultra Heat GMV Multi VRF Series Owner's Manual page 20

Ultra Heat GMV Multi VRF_Heat Recovery Serial
Height difference between indoor units
Maximum length of Main pipe(3)
From IDU to its nearest branch (4)
Notices:
(1) Normally, the pipe length from the first branch of IDU to the farthest IDU is 40m (131-1/4feet).
Under the following conditions, the length can reach 90m (295-1/4feet).
1) Actual length of pipe in total: L1+L2x2+L3x2+L4x2+...+L9x2+
1000m (3280- 3/4feet).
2) Length between each IDU and its nearest branch
≤40m(131- 1/4feet).
D22
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: L12-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 ≥50m (164
ft), then adjust the pipe size.
Total rated capacity of
ODU: C (Btu/h)
GMV-VQ72W/A-F(U)
GMV-VQ96W/A-F(U)
GMV-VQ192WM/A-F(U)
(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).
4.3.4 Connection pipe among outdoor modules
Pipe between outdoor unit and the first indoor branch
Low pressure gas pipe
mm(inch)
No need to enlarge pipe size
No need to enlarge pipe size
Φ34.9(1-3/8)
≤15(49)
≤90(295-1/4)
≤40(131-1/4)
A11, A12, B11, B21, B22, B31, C11, D11, D21,
Liquid pipe mm(inch)
No need to enlarge pipe size
No need to enlarge pipe size
Φ19.05(3/4)
Fig.18
15
h1
L1
A11,A12,B21,B22,D21,D22
x2
L10 +A11+A12+...+D21+D22
High pressure gas pipe
mm(inch)
Φ22.2(7/8)
Φ22.2(7/8)
Φ31.8(1-1/4)
≤