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R410A Refrigerant System
Equivalent length from the first branch to the furthest
piping (1)
Height difference
between outdoor unit
and indoor unit
Height difference between indoor units
Maximum length of Main pipe(3)
From IDU to its nearest branch (4)
(1) Normally, the pipe length from the first branch of IDU to the farthest IDU is
40m(131-1/4ft.). Under the following conditions, the length can reach 90m(295-1/4ft.).
1) Actual
≤1000m(3280-3/4ft.).
2) Length between each IDU and its nearest branch a, b, c, d, e, f, g, h, i, j≤40m(131-
3) 1/4ft.).
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:
L10-L11≤40m(131-1/4ft.).
(2) When the maximum length of the main pipe from ODU to the first branch of IDU
is≥90m(295-1/4ft.), then adjust the pipe size of the gas pipe and liquid pipe of main
pipe according to the following table.
Outdoor Model
GMV-Y96WM/A-F(U)
(3) If the length between an IDU and its nearest branch is above 10m(32-4/5ft.), then
increase the size of the liquid pipe of IDU (only for the pipe size that
is≤6.35mm(1/4in.).
4.3.4 Fitting pipe between Outdoor Unit and the First Manifold
(1) single module system, pipe size (between outdoor unit and the first manifold) is
determined by that of outdoor unit.
Outdoor unit at upper(2)
Outdoor unit at lower(2)
length
of
pipe
in
Gas pipe size mm(in.)
No need to enlarge pipe size
Allowable Value
m(ft.)
≤40(131-1/4)
≤90(295-1/4)
≤90(295-1/4)
≤30(98-2/4)
<90(295-1/4)
≤40(131-1/4)
total:
L1+L2x2+L3x2+L4x2+...+L9x2+a+b+...+i+j
Fig.4.3.4
14
Photovoltaic Multi VRF
Fitting Pipe
L6+L7+L8+L9+j
——
——
——
L1
a,b,c,d,e,f,g,h,i,j
Liquid pipe size mm(in.)
Φ12.7(1/2)
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