Allowable Pipe Length And Drop Height Among Idu And Odu - Gree Ultra Heat GMV Multi VRF Heat Recovery Series Service Manual

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial
3 ALLOWABLE PIPE LENGTH AND DROP HEIGHT AMONG IDU AND
ODU
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).
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
between outdoor unit
and indoor unit
Height difference between indoor units
Actual length
Equivalent length
Outdoor unit at upper(2)
Outdoor unit at lower(2)
Allowable Value
m(feet)
≤1000(3280-3/4) 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(131-1/4)
≤15(49)
42
INSTALLATION
Fitting Pipe
L1+L7+L8+L10+D22
L12-L11
L7+L8+L10+D22
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