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18
Refrigerant pipe diameter from branch to branch (B,C,D)
WARNING
!
* : Serial connection of HR units : Capacity sum of indoor units ≤
192.4 kBtu/hr
• Refer to the HR unit PCB part for the valve group control setting.
• It is recommended that difference in pipe lengths between an
HR unit and indoor units, for example
difference in length of a, b, c, and d, be minimized. The larger
difference in pipe lengths, the more different performance
between indoor units.
• Piping length from outdoor branch to outdoor unit ≤ 10 m (33 ft),
equivalent length : max 13 m (43 ft)
* If the large capacity indoor units (Over 5 HP; using over Ø 15.88
(5/8) / Ø 9.52 (3/8)) are installed, it should be used the Valve
Group setting
Refrigerant pipe diameter from branch to branch (B,C)
Downward indoor
Liquid pipe
unit total capacity
[mm(inch)]
[kW(Btu/h)]
≤ 5.6 (19 100)
Ø 6.35 (1/4)
< 16.0 (54 600)
Ø 9.52 (3/8)
≤ 22.4 (76 400)
Ø 9.52 (3/8)
< 33.6 (114 700)
Ø 9.52 (3/8)
< 50.4 (172 000)
Ø 12.7 (1/2)
< 67.2 (229,400)
Ø 15.88 (5/8)
< 72.8 (248 500)
Ø 15.88 (5/8)
< 100.8 (344 000)
Ø 19.05 (3/4)
< 173.6 (592 500)
Ø 19.05 (3/4)
Total pipe length = A + B + C1 + C2 + C3 + a + b + c + d
+ e + f + g + i + j + k + l + m + n ≤ 500 m (1 640 ft)
Longest pipe length
A+B+C3+D+k ≤ 150 m (200 m**)
L
[(492 ft (656 ft**)]
Longest pipe length after 1st branch
B+C3+D+k ≤ 40 m(90 m**) [131 ft (295 ft)]
Difference in height (Outdoor Unit ÷ Indoor Unit)
H
H ≤ 50 m (164 ft)
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 40 m (131 ft)
Difference in height (Outdoor Unit ÷ Outdoor Unit)
h1
h1 ≤ 2 m (6.6 ft)
Difference in height (HR unit ÷ HR unit)
"a", "b"
a ≤ 15 m (49 ft), b ≤ 5 m (16 ft)
• * : Assume equivalent pipe length of Y branch to be 0.5 m
(1.64 ft), that of header to be 1 m (3.3 ft), calculation purpose
• it is recommended that indoor unit is installed at lower position
than the header.
• ** : Conditional application
Gas pipe [mm(inch)]
Low pressure
High pressure
Ø 12.7 (1/2)
Ø 9.52 (3/8)
Ø 15.88 (5/8)
Ø 12.7 (1/2)
Ø 19.05 (3/4)
Ø 15.88 (5/8)
Ø 22.2 (7/8)
Ø 19.05 (3/4)
Ø 28.58 (1 1/8)
Ø 22.2 (7/8)
Ø 28.58 (1 1/8)
Ø 22.2 (7/8)
Ø 34.9 (1 3/8)
Ø 28.58 (1 1/8)
Ø 34.9 (1 3/8)
Ø 28.58 (1 1/8)
Ø 41.3 (1 5/8)
Ø 34.9 (1 3/8)
*Equivalent pipe length
A+B+C3+D+k ≤ 175 m (225 m**)
[(574 ft (738 ft**)]
(**) Conditional Application (In case of D12 is the farthest in door)
Below condition must be satisfied for 40~90 m (131~295 ft) piping
length after first branch.
1
Diameter of pipes between first branch and the last branch should
be increased by one step, except if the pipe diameter B, C3 is same
as diameter A (main pipe diameter)
Ø 6.35 (1/4) ' Ø 9.52 (3/8) ' Ø 12.7 (1/2) ' Ø 15.88 (5/8) '
Ø 19.05 (3/4) ' Ø 22.2 (7/8) ' Ø 25.4*(1), Ø 28.58 (1-1/8) '
Ø 31.8*(1-1/4), Ø 34.9 (1-3/8) ' Ø 38.1*(1-1/2)
* : If available on site, it use this size. Otherwise it can't be
increased.
2
While calculating total refrigerant piping length, pipe B, C3 length
should be calculated twice.
A+Bx2+C3x2+C1+C2+a+b+c+d+e+f+g+i+j+k+l+m+n ≤
500 m (1 641 ft)
3
Length of pipe from each indoor unit to the closest HR unit
(a, b, c, d, e, f, g, i, j, k, l, m, n) ≤ 40 m (131 ft)
4
[Length of pipe from outdoor unit to the farthest indoor unit D12
(B+C3+K)
- [Length of pipe from outdoor unit to the closest indoor unit D1
(C1+a)] ≤ 40 m (131 ft)
WARNING
!
When the equivalent length between a outside and the farthest
indoor unit is 90 m (295 ft) or more, main pipe(A) must be
increased one grade.
Refrigerant pipe diameter from outdoor unit to first
branch. (A)
Standard Pipe Diameter
ODU
Capacity
Low
(HP(ton))
Liquid Pipe
Pressure
Pressure
mm (inch)
Vapor Pipe
Vapor Pipe
[mm(inch)]
[mm(inch)]
Ø 9.52
Ø 19.05
Ø 15.88
8(6)
(3/8)
(3/4)
Ø 9.52
Ø 22.2
Ø 19.05
10(8)
(3/8)
(7/8)
Ø 12.7
Ø 28.58
Ø 19.05
12(10)
(1/2)
(1-1/8)
Ø 12.7
Ø 28.58
14(12)
(1/2)
(1-1/8)
Ø 15.88
Ø 28.58
Ø 28.58
20(16)
(5/8)
(1-1/8)
Ø 15.88
Ø 34.9
Ø 28.58
24(20)
(5/8)
(1-3/8)
28~34
Ø 19.05
Ø 34.9
Ø 28.58
(24~28)
(3/4)
(1-3/8)
43~54
Ø 19.05
Ø 41.3
Ø 28.58
(36~46)
(3/4)
(1-5/8)
* If available on site, select pipe size according to upper table.
Otherwise it doesn't need to be increased.
Pipe diameter when pipe length is ≥
90 m (295 ft)
High
Low
Liquid Pipe
Pressure
Pressure
mm (inch)
Vapor Pipe
Vapor Pipe
[mm(inch)]
[mm(inch)]
Ø 12.7
Not
(5/8)
(1/2)
increased
increased
Ø 12.7
Not
(3/4)
(1/2)
increased
increased
Ø 15.88
Not
(3/4)
(5/8)
increased
increased
Ø 22.2
Ø 15.88
Not
(7/8)
(5/8)
increased
increased
Ø 19.05
Not
(1-1/8)
(3/4)
increased
increased
Ø 19.05
Not
(1-1/8)
(3/4)
increased
increased
Ø 22.2
Not
(1-1/8)
(7/8)
increased
increased
Ø 22.2
Not
(1-1/8)
(7/8)
increased
increased
High
Not
Not
Not
Not
Not
Not
Not
Not
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