Gree GMV5 Series Manual page 130

10.2 Allowable pipe length and drop height among indoor and outdoor units
Y type branch joint is adopted to connected indoor and outdoor units. Connecting method is shown in
the figure below
Remark Equivalent length of one Y-type manifold is about 0.5m(1-3/4feet).
Module 1 Module 2
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(1-3/4feet).
R410A Refrigerant System
Total length (actual length) of fitting pipe
Length of farthest fitting
pipe m(ft.)
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
Maximum length of Main pipe(3)
From IDU to its nearest branch (4)
NOTES:
(1) Normally, the pipe length from the first branch of IDU to the farthest IDU is 40m(131-1/4feet).
128
Module 3
Actual length
Equivalent length
Outdoor unit at upper(2)
Outdoor unit at lower(2)
L1
L2
L3
L11
Allowable Value
m(ft.)
L1+L2+L3+L4+...+L10+A11+A12+...
≤ 1000(3280-3/4)
≤ 165(541-1/4)
≤ 190(623-1/4)
≤ 40(131-1/4)
≤ 40(131-1/4)
≤ 90(295-1/4)
≤ 90(295-1/4)
≤ 30(98-2/4)
＜ 90(295-1/4)
≤ 40(131-1/4)
L4
Fitting Pipe
+D21+D22
L
——
L12-L11
L7+L8+L10+D22
——
——
h1
L1
A11,A12,B21,B22,D21,D22