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Refrigerant pipe diameter from branch to branch (B,C,D)
WARNING
!
• Piping length from outside unit branch to outside unit ≤
10m(32.8ft), equivalent length : max 13m(42.7ft) (for
12Ton(144kBtu) or more)
* If the large capacity indoor units (Over 48kBtu; using over
Ø15.88(5/8)/ Ø9.52(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)
Ø6.35(1/4)
< 16.0 (54,600)
Ø9.52(3/8)
≤ 22.4 (76,400)
Ø9.52(3/8)
< 33.6(114,700)
Ø9.52(3/8)
< 50.4 (172,000)
Ø12.7(1/2)
< 67.2 (229,400)
Ø15.88(5/8)
< 72.8(248,500)
Ø15.88(5/8)
< 100.8(344,000)
Ø19.05(3/4)
< 173.6(592,500)
Ø19.05(3/4)
< 184.8(630,700)
Ø22.2(7/8)
≤ 224.0(764,400)
Ø22.2(7/8)
Total pipe length = A + B + C1 + C2 + C3 + a + b + c + d
+ e + f + g + i + j + k + l + m + n ≤ 500m(1640ft)
Longest pipe length
A+B+C3+k ≤150m(200m**)
L
[(492ft(656ft**)]
Longest pipe length after 1st branch
B+C+D+e ≤ 40m(90m**) [131ft(295ft)]
Difference in height (Outdoor Unit ↔ Indoor Unit)
H
H ≤ 50m(164ft)
Difference in height (Indoor Unit ↔ Indoor Unit)
h
h ≤ 40m(131ft)
Difference in height (Outdoor Unit ↔ Outdoor Unit)
h1
h1 ≤ 2m(6.6ft)
Difference in height(HR unit ↔ HR unit)
"a", "b"
a ≤ 15m(49ft) , b ≤ 5m(16ft)
• * : Assume equivalent pipe length of Y branch to be 1.64ft, that
of header to be 3.3ft, calculation purpose
• it is recommended that indoor unit is installed at lower position
than the header.
• ** : Conditional application
WARNING
!
When the equivalent length between a outside and the farthest
indoor unit is 90m(295ft) or more, main pipe(A) must be increased
one grade.
Gas pipe [mm(inch)]
Low pressure
High pressure
Ø12.7(1/2)
Ø9.52(3/8)
Ø15.88(5/8)
Ø12.7(1/2)
Ø19.05(3/4)
Ø15.88(5/8)
Ø22.2(7/8)
Ø19.05(3/4)
Ø28.58(1 1/8)
Ø22.2(7/8)
Ø28.58(1 1/8)
Ø22.2(7/8)
Ø34.9(1 3/8)
Ø28.58(1 1/8)
Ø34.9(1 3/8)
Ø28.58(1 1/8)
Ø41.3(1 5/8)
Ø34.9(1 3/8)
Ø44.5(1 3/4)
Ø41.3(1 5/8)
Ø53.98(2 1/8)
Ø44.5(1 3/4)
*Equivalent pipe length
A+B+C3+k ≤175m(225m**)
[(574ft(738ft**)]
Refrigerant pipe diameter from outside unit to first
branch. (A)
Upward out-
side unit total
Pipe diameter
capacity
Low pres-
Liquid
sure gas
HP
TON
mm(inch)
pipe
mm(inch)
8
6
9.52(3/8) 22.2(7/8)
10
8
12
10
25.4(1)
14
12
12.7(1/2)
18
14
28.58(1-
1/8)
20
16
24
20
34.9(1-
28
24
3/8)
34
28
19.05(3/4)
38
32
41.3
46
40
(1-5/8)
54
48
* If available on site, it use this size. Otherwise it can't be increased.
Y branch, Header and HR unit connection pattern
Pattern 1
B
HR1
1
2
48k
48k
• Impossible installation : Head branch pipe
Pattern 2
HR1
B
1
2
3
4
7k
7k
7k
7k
• Impossible installation : HR unit
pipe
Y and Head branch pipe.
Pipe diameter when pipe
length is 90m over to 1st
branch
High pres-
Low pres-
High pres-
sure gas
Liquid
sure gas
sure gas
pipe
mm(inch)
pipe
mm(inch)
mm(inch)
mm(inch)
12.7(1/2) 22.2(7/8)
19.05(3/4)
25.4(1)
19.05(3/4)
15.88(5/8)
28.58
(1-1/8)
28.58
34.9
(1-1/8)
(1-3/8)
22.2(7/8)
34.9
41.3
(1-3/8)
(1-5/8)
HR2
3
4
48k
48k
HR unit
A
5
6
7
7k
24k
24k
Head branch
17
pipe
28.58
(1-1/8)
34.9
(1-3/8)
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