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MULTI V Water IV
8. Refrigerant Piping System
Refrigerant pipe diameter from outside unit to first branch. (A, E, F, G)
Upward outside
unit total capacity
HP
8
10
14
16 ~ 20
22 ~34
40 ~ 60
62 ~ 64
68 ~ 80
*If available on site, select pipe size from the pipe diameter table according to capacity.
Otherwise it doesn't need to be increased.
WARNING
To install maximum pipe length after the 1st branch exceeding 40 m and 90 m or less, the following conditions
must be satisfied.
(Table 1) Cautions during the installation of Maximum pipe length 90m after the 1st branch
Required
Select the diameter of the pipe between the 1st
branch and the last branch to be 1 level larger.
1
Provided that, it is not necessary if the pipe
diameter is the same as the main pipe.
During the calculation of the total refrigerant pipe
2
length, the above pipe length shall be calculated
as twice.
The length from each indoor unit to the nearest
3
branch pipe
40 m
Length from outside unit to the far- thest indoor
unit] – [Length from out- side unit to the nearest
4
indoor unit]
40 m
Cautions for Y branch pipe
WARNING
If the pipe diameter(B, C) connected after the 1st branch is larger than the main pipe diameter(A), install the pipe
diameter(B, C) connected after the 1st branch to be the same as the main pipe diameter(A).
Example) If indoor units are connected 120 % to 29 kW
Heat Pump
Standard pipe diameter
Liquid pipe
Gas pipe
[mm(inch)]
[mm(inch)]
Ø 9.52(3/8)
Ø 22.2(7/8)
Ø 9.52(3/8)
Ø 22.2(7/8)
Ø 12.7(1/2)
Ø 25.4(1)
Ø 12.7(1/2)
Ø 28.58(1-1/8)
Ø 19.05(3/4)
Ø 34.9(1-3/8)
Ø 19.05(3/4)
Ø 41.3(1-5/8)
Ø 22.2(7/8)
Ø 44.5(1-3/4)
Ø 22.2(7/8)
Ø 53.98(2-1/8)
40 m < B+C+D+e
Change B, C, and D pipe
A+Bx2+Cx2+
Dx2+a+b+c+d+e
a,b,c,d,e
(A+B+C+D+e)-(A+a)
Increased pipe diameter
When equivalent pipe length from the
outside unit to farthest indoor unit is
Liquid pipe
[mm(inch)]
Ø 12.7(1/2)
Ø 12.7(1/2)
Ø 15.88(5/8)
Ø 15.88(5/8)
Ø 22.2(7/8)
Ø 22.2(7/8)
Ø 25.4(1)
Ø 25.4(1)
Example
Ø6.35
Ø9.52, Ø9.52
Ø12.7
Ø15.88, Ø15.88
Ø19.05
Ø22.2, Ø22.2
90 m
Ø25.4
Ø28.58, Ø28.58
Ø31.8
Ø34.9, Ø34.9
diameter.
*If available on site, select pipe size from the pipe
diameter table according to capacity.
Otherwise it doesn't need to be increased.
500 m
40 m
40 m
b
Installation of Outside Units
90m and over
Gas pipe
[mm(inch)]
not increased
Ø 25.4(1)
Ø 28.58(1-1/8)
Ø 31.8(1-1/4)
Ø 38.1(1-1/2)
not increased
Ø 53.98(2-1/8)
not increased
Ø12.7,
Ø19.05,
Ø25.4,
Ø31.8,
Ø38.1
a
d
IDU
d
Direction
L
d
d
d
d
h 40m
d
23
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