YMGI
•
Your Modern Green Idea
26
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
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 length of pipe in total: L1+L2x2+L3x2+L4x2+…+L9x2+a+b+…+i+j ≤ 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- 1/4ft.).
3) 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.).
When the outdoor unit is at upper side and height difference is more than 50m, please consult company for the
related technical requirement.
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
Gas pipe size mm(in.)
Liquid pipe size mm(in.)
VRFO-72VP-U2C(55)5
No need to enlarge pipe size
No need to enlarge pipe size
VRFO-96VP-U2C(55)5
No need to enlarge pipe size
Φ12.7(1/2)
VRFO-120VP-U2C(55)5
No need to enlarge pipe size
Φ15.9(5/8)
VRFO-144VP-U2C(55)5
Φ34.9(1-3/8)
Φ15.9(5/8)
VRFO-168VP-U2C(55)5
Φ34.9(1-3/8)
Φ19.05(3/4)
VRFO-192VP-U2C(55)5
Φ34.9(1-3/8)
Φ19.05(3/4)
VRFO-216VP-U2C(55)5
Φ34.9(1-3/8)
Φ19.05(3/4)
VRFO-240VP-U2C(55)5
No need to enlarge pipe size
Φ19.05(3/4)
VRFO-264VP-U2C(55)5
No need to enlarge pipe size
Φ22.2(7/8)
VRFO-288VP-U2C(55)5
No need to enlarge pipe size
Φ22.2(7/8)
VRFO-312VP-U2C(55)5
No need to enlarge pipe size
Φ22.2(7/8)
VRFO-336VP-U2C(55)5
No need to enlarge pipe size
Φ22.2(7/8)
VRFO-360VP-U2C(55)5
No need to enlarge pipe size
Φ22.2(7/8)
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.).
