17
Unit: m(ft.)
Fig.22
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
m(ft.)
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
Equivalent length from the first branch to the
furthest piping (1)
≤
40(131-1/4)
L6+L7+L8+L9+j
Height
difference
between outdoor unit
and indoor unit
Outdoor unit at upper(2)
≤
90(295-1/4)
——
Outdoor unit at lower(2)
≤
90(295-1/4)
——
Height difference between indoor units
≤
30(98-2/4)
——
Maximum length of Main pipe(3)
＜
90(295-1/4)
L1
From IDU to its nearest branch (4)
≤
40(131-1/4)
a,b,c,d,e,f,g,h,i,j
Lennox
VRF Unit
