D.C. Inverter Multi-variable Modular
14
4.2.3 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.
L1
L2
L11
L10
L6
L3
L4
L5
L7
L8
L9
Height dif
ference be
tween indoor unit and outdoor unit: H
The 1st
branch section
Height dif
ference
Indoor unit
Outdoor unit
between outdoor unit and the farthest indoor unit
Fig.18
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
R410A Refrigerant System
Allowable
Value
Fitting Pipe
Total length (actual length) of fitting pipe
1000
L1+L2+L3+L4+…+L9+a+b+…+i+j
Length of farthest fitting
pipe(m)
Actual length
165
L1+L6+L7+L8+L9+j
Equivalent length
190
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
L10-L11
Equivalent length from the first branch to the furthest
piping (1)
40
L6+L7+L8+L9+j
