18
ENGLISH
- * : Assume equivalent pipe length of Y branch to be 0.5 m (1.64 ft),
that of header to be 1m (3.3 ft), calculation purpose
- It is recommended that indoor unit is installed at lower position than
the header.
- ** : To apply conditional application.
Refrigerant pipe diameter from branch to branch (B,C)
Downward indoor
unit total capacity
[kW(Btu/h)]
Liquid pipe
[mm(inch)]
Gas pipe [mm(inch)]
Low pressure High pressure
≤ 5.6(19 100)
Ø 6.35(1/4) Ø 12.7(1/2) Ø 9.52(3/8)
< 16.0(54 600) Ø 9.52(3/8) Ø 15.88(5/8) Ø 12.7(1/2)
< 22.4(76 400) Ø 9.52(3/8) Ø 19.05(3/4) Ø 15.88(5/8)
< 33.6(114 700) Ø 9.52(3/8) Ø 22.2(7/8) Ø 19.05(3/4)
< 50.4(229 000) Ø 12.7(1/2) Ø 28.58(1 1/8) Ø 22.2(7/8)
< 61.6(210 600) Ø 15.88(5/8) Ø 28.58(1 1/8) Ø 22.2(7/8)
< 72.8(210 600) Ø 15.88(5/8) Ø 34.9(1 3/8) Ø 28.58(1 1/8)
< 100.8(344 000) Ø 19.05(3/4) Ø 34.9(1 3/8) Ø 28.58(1 1/8)
< 173.6(592 500) Ø 19.05(3/4) Ø 41.3(1 5/8) Ø 34.9(1 3/8)
Total pipe length = A+B+C1+C2+C3+a+b+c+d+e+f+g+
i+j+k+l+m+n ≤ 1 000 m (3 280 ft)
L
Longest pipe length * Equivalent pipe length
A+B+C3+D+k ≤ 150 m (200 m**) [(492 ft(656 ft**)] A+B+C3+D+k ≤ 175 m (225 m**) [(574 ft(738 ft**)]
l
Longest pipe length after 1st branch
B+C3+D+k ≤ 40 m(90 m**) [131 ft (295 ft)]
H
Difference in height(Outdoor Unit ↔ Indoor Unit)
H ≤ 110 m (361 ft)
h
Difference in height (Indoor Unit ↔ Indoor Unit)
h ≤ 40 m (131 ft)
h1
Difference in height (Outdoor Unit ↔ Outdoor Unit)
h1 ≤ 5 m (16.4 ft)
"a", "b"
Difference in height(HR unit ↔ HR unit)
a ≤ 15 m (49 ft), b ≤ 5 m (16 ft)
WARNING
!
When the equivalent length between a outdoor 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)
Y branch, Header and HR unit connection pattern
* If available on site, select pipe size according to upper table.
Otherwise it doesn’t need to be increased.
Pattern 1
HR1
48 k 48 k
1 2
HR2
48 k 48 k
3 4
B
• Impossible installation : Head branch pipe HR unit
Pattern 2
HR1
1
234567
7 k 7 k 7 k 7 k 7 k 24 k 24 k
• Impossible installation : HR unit Head branch
pipe Y and Head branch pipe.
B
A
ODU
Capacity
(HP(ton))
Standard Pipe Diameter
Pipe diameter when pipe length is ≥
90 m (295 ft) or when height differential
(ODU↔IDU) is > 50 m (164 ft)
Liquid Pipe
mm (inch)
Low
Pressure
Vapor Pipe
[mm(inch)]
High
Pressure
Vapor Pipe
[mm(inch)]
Liquid Pipe
mm (inch)
Low
Pressure
Vapor Pipe
[mm(inch)]
High
Pressure
Vapor Pipe
[mm(inch)]
8(6)
Ø 9.52
(3/8)
Ø 19.05
(3/4)
Ø 15.88
(5/8)
Ø 12.7
(1/2)
Not
increased
Not
increased
10(8)
Ø 9.52
(3/8)
Ø 22.2
(7/8)
Ø 19.05
(3/4)
Ø 12.7
(1/2)
Not
increased
Not
increased
12(10)
Ø 12.7
(1/2)
Ø 28.58
(1-1/8)
Ø 19.05
(3/4)
Ø 15.88
(5/8)
Not
increased
Not
increased
14(12)
Ø 12.7
(1/2)
Ø 28.58
(1-1/8)
Ø 22.2
(7/8)
Ø 15.88
(5/8)
Not
increased
Not
increased
18(14)
Ø 15.88
(5/8)
Ø 28.58
(1-1/8)
Ø 22.2
(7/8)
Ø 19.05
(3/4)
Not
increased
Not
increased
20~22
(16~18)
Ø 15.88
(5/8)
Ø 28.58
(1-1/8)
Ø 28.58
(1-1/8)
Ø 19.05
(3/4)
Not
increased
Not
increased
24(20)
Ø 15.88
(5/8)
Ø 34.9
(1-3/8)
Ø 28.58
(1-1/8)
Ø 19.05
(3/4)
Not
increased
Not
increased
26~34
(22~28)
Ø 19.05
(3/4)
Ø 34.9
(1-3/8)
Ø 28.58
(1-1/8)
Ø 22.2
(7/8)
Not
increased
Not
increased
36~50
(30~42)
Ø 19.05
(3/4)
Ø 41.3
(1-5/8)
Ø 28.58
(1-1/8)
Ø 22.2
(7/8)
Not
increased
Not
increased
(**) 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 ≤ 1 000 m (3
281 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)
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