GREE Photovoltaic Direct-driven Inverter Multi VRF Units
40
5.3 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).
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 (1-3/4ft.).
R410A Refrigerant System
Allowable Value
Fitting Pipe
Total length (actual length) of fitting pipe ≤1000(3280-3/4) L1+L2+L3+L4+…+L9+a+b+…+i+j
Length of farthest
fitting pipe m(ft.)
Actual length ≤165(541-1/4)
L1+L6+L7+L8+L9+j
Equivalent length ≤190(623-1/4)
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(131-1/4) L10-L11
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