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17
ENGLISH
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
unit total capacity
[kW(Btu/h)]
Liquid pipe
[mm(inch)]
Gas pipe [mm(inch)]
Low pressure High pressure
≤ 5.6(19,100)
Ø6.35(1/4) Ø12.7(1/2) Ø9.52(3/8)
< 16.0 (54,600) Ø9.52(3/8) Ø15.88(5/8) Ø12.7(1/2)
≤ 22.4 (76,400)
Ø9.52(3/8) Ø19.05(3/4) Ø15.88(5/8)
< 33.6(114,700) Ø9.52(3/8) Ø22.2(7/8) Ø19.05(3/4)
< 50.4 (172,000) Ø12.7(1/2) Ø28.58(1 1/8) Ø22.2(7/8)
< 67.2 (229,400) Ø15.88(5/8) Ø28.58(1 1/8) Ø22.2(7/8)
< 72.8(248,500) Ø15.88(5/8) Ø34.9(1 3/8) Ø28.58(1 1/8)
< 100.8(344,000) Ø19.05(3/4) Ø34.9(1 3/8) Ø28.58(1 1/8)
< 173.6(592,500) Ø19.05(3/4) Ø41.3(1 5/8) Ø34.9(1 3/8)
< 184.8(630,700) Ø22.2(7/8) Ø44.5(1 3/4) Ø41.3(1 5/8)
≤ 224.0(764,400)
Ø22.2(7/8) Ø53.98(2 1/8) Ø44.5(1 3/4)
Total pipe length = A + B + C1 + C2 + C3 + a + b + c + d
+ e + f + g + i + j + k + l + m + n ≤ 500m(1640ft)
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.
!
Refrigerant pipe diameter from outside unit to first
branch. (A)
Y branch, Header and HR unit connection pattern
* If available on site, it use this size. Otherwise it can't be increased.
Pattern 1
HR1
48k 48k
1 2
HR2
48k 48k
3 4
B
• Impossible installation : Head branch pipe HR unit
Upward out-
side unit total
capacity
Pipe diameter
Pipe diameter when pipe
length is 90m over to 1st
branch
HP TON
Liquid
mm(inch)
Low pres-
sure gas
pipe
mm(inch)
High pres-
sure gas
pipe
mm(inch)
Liquid
mm(inch)
Low pres-
sure gas
pipe
mm(inch)
High pres-
sure gas
pipe
mm(inch)
86
9.52(3/8) 22.2(7/8)
19.05(3/4)
12.7(1/2) 22.2(7/8)
19.05(3/4)
10 8
12 10
12.7(1/2)
25.4(1)
15.88(5/8)
25.4(1)
14 12
18 14
28.58(1-
1/8)
28.58
(1-1/8)
20 16
24 20
19.05(3/4)
34.9(1-
3/8)
28.58
(1-1/8)
22.2(7/8)
34.9
(1-3/8)
28.58
(1-1/8)
28 24
34 28
38 32
41.3
(1-5/8)
34.9
(1-3/8)
41.3
(1-5/8)
34.9
(1-3/8)
46 40
54 48
Pattern 2
HR1
1
234567
7k 7k 7k 7k 7k 24k 24k
• Impossible installation : HR unit Head branch
pipe Y and Head branch pipe.
B
A
• * : 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
L
Longest pipe length *Equivalent pipe length
A+B+C3+k ≤150m(200m**)
[(492ft(656ft**)]
A+B+C3+k ≤175m(225m**)
[(574ft(738ft**)]
l
Longest pipe length after 1st branch
B+C+D+e ≤ 40m(90m**) [131ft(295ft)]
H
Difference in height (Outdoor Unit ↔ Indoor Unit)
H ≤ 50m(164ft)
h
Difference in height (Indoor Unit ↔ Indoor Unit)
h ≤ 40m(131ft)
h1
Difference in height (Outdoor Unit ↔ Outdoor Unit)
h1 ≤ 2m(6.6ft)
"a", "b"
Difference in height(HR unit ↔ HR unit)
a ≤ 15m(49ft) , b ≤ 5m(16ft)
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