Gree Ultra Heat GMV Multi VRF Series Owner's Manual page 19

4.3.3 Allowable pipe length and drop height among indoor and outdoor units
Y type branch joint is adopted to connect 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).
L12: 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).
Equivalent length of mode exchanger depends on the using situation, for example, when using one
branch, the length is 1m (39-3/8 inch), when using N branches, the length is N meters.
.
R410A Refrigerant System
Total length (actual length) of fitting pipe
Length of farthest
fitting pipe m(feet)
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 Outdoor unit at upper(2)
between outdoor
Outdoor unit at lower(2)
unit and indoor unit
≤1000(3280-3/4)
Actual length
Equivalent length
Ultra Heat GMV Multi VRF_Heat Recovery Serial
Fig.17
Allowable Value
m(feet)
L1+L2+L3+L4+...+L10+A11+A12+...+D21+D22
≤165(541-1/4)
≤190(623-1/4)
≤40(131-1/4)
≤40(131-1/4)
≤50(164)
≤40(131)
14
Fitting Pipe
L
L12-L11
L7+L8+L10+D22
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