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Installation of Outside Unit
4. Refrigerant Piping System
Upward Outdoor
Standard Pipe Diameter
/Outside unit
total capacity
(HP)
Liquid pipe
[mm(inch)]
8
Ø 9.52 (3/8)
10
Ø 9.52 (3/8)
12~ 14
Ø 12.7 (1/2)
16
Ø 12.7 (1/2)
18 ~ 22
Ø 15.88 (5/8)
24
Ø 15.88 (5/8)
26 ~ 34
Ø 19.05(3/4)
36 ~ 60
Ø 19.05 (3/4)
62 ~ 64
Ø 22.2(7/8)
66 ~ 96
Ø 22.2 (7/8)
• * : If available on site, select pipe size from the pipe diameter table according to capacity.
Otherwise it doesn't need to be increased.
• Model line up could be different in accordance with target region.
Refrigerant pipe diameter from branch to branch (B,C,D)
Downward indoorunit total
capacity [kW(Btu/h)]
≤ 5.6(19,100)
< 16.0 (54,600)
< 22.4 (76,400)
< 33.6(114,700)
< 50.4(172,000)
< 67.2(229,300)
< 72.8(248,400)
< 100.8(344,000)
< 173.6(592,500)
< 184.8(630,700)
≤ 291.2(993,600)
Guide for Conditional Application(**)
If the below conditions are satisfied, limit of longest pipe length after 1st branch( l) could be extended
by 40m(131ft) → 90m(295ft).
• Pipe diameter Size Up
Pipe diameter(only Liquid/low pressure gas pipes) between 1st branch and last branch(HR unit) is increased byone step.
If the pipe diameter of B, C3 is same as A, it is not necessary.
: Ø 6.35 → Ø 9.52 → Ø 12.7 → Ø 15.88 → Ø 19.05 → Ø 22.2 → ...
If available on site, select pipe size from the pipe diameter table according to capacity. Otherwise it doesn't need to increase
.
• Correction for calculating the total pipe length
When calculating total pipe length, pipe B,C,D length should be calculated twice.
: A + B x 2 + C3 x 2 + D x 2 + C1 + C2 + a + b + c + d + e + f + g + i + j + k + l + m + n ≤ Overall Pipe Length
• Indoor unit pipe length
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) ≤ 40m (131ft).
• Difference in length between outdoor unit and the farthest or closest indoor unit
[Length of pipe from outdoor unit to the farthest indoor unit 12 (B + C3 + D + k)] - [Length of pipe from outdoor unit to the
closest indoor unit 1 (C1 + a)] ≤ 40m (131ft)
• After 1st branch directly connected indoor unit(Heat Pump System Only)
When installing pipe of indoor unit directly connected after 1st branch more than 40m and less than 90m,
-Pipe diameter is increased by one step.
Ø 6.35 → Ø 9.52 → Ø 12.7 → Ø 15.88 → Ø 19.05 → Ø 22.2 → ...
-Pipe length should be calculated twice.
For Heat Pump System
Equivalent pipe length is
90m(295ft) or more
from ODU to farthest IDU
Gas pipe
Liquid pipe
[mm(inch)]
[mm(inch)]
Ø 19.05 (3/4)
Ø 12.7 (1/2)
Ø 22.2 (7/8)
Ø 12.7 (1/2)
Ø 28.58 (1-1/8)
Ø 15.88(5/8)
Ø 28.58 (1-1/8)
Ø 15.88 (5/8)
Ø 28.58 (1-1/8)
Ø 19.05 (3/4)
Ø 34.9(1-3/8)
Ø 19.05(3/4)
Ø 34.9 (1-3/8)
Ø 22.2(7/8)
Ø 41.3 (1-5/8)
Ø 22.2(7/8)
Ø 41.3 (1-5/8)
Ø 25.4(1) *
Ø 53.98 (2-1/8)
Ø 25.4(1) *
Liquid pipe
[mm(inch)]
Ø6.35(1/4)
Ø9.52(3/8)
Ø9.52(3/8)
Ø9.52(3/8)
Ø12.7(1/2)
Ø15.88(5/8)
Ø15.88(5/8)
Ø19.05(3/4)
Ø19.05(3/4)
Ø22.2(7/8)
Ø22.2(7/8)
7
Increased Pipe Diameter
Gas pipe
Liquid pipe
[mm(inch)]
[mm(inch)]
Ø 22.2 (7/8)
Ø 12.7 (1/2)
Ø 25.4 (1) *
Ø 12.7 (1/2)
Not increased
Ø 15.88(5/8)
Ø 31.8(1-1/4) *
Ø 15.88 (5/8)
Ø 31.8(1-1/4) *
Ø 19.05 (3/4)
Not increased
Ø 19.05(3/4)
Ø 38.1(1-1/2) *
Ø 22.2(7/8)
Not increased
Ø 22.2 (7/8)
Ø 53.98(2-1/8)
Ø 25.4(1) *
Not increased
Ø 25.4(1) *
Low Pressure Gas pipe
[mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
Ø28.58(1-1/8)
Ø28.58(1-1/8)
Ø34.9(1-3/8)
Ø34.9(1-3/8)
Ø41.3(1-5/8)
Ø41.3(1-5/8)
Ø53.98(2-1/8)
Installation
When Level difference is
50m or more
Gas pipe
[mm(inch)]
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
High Pressure Gas pipe
[mm(inch)]
Ø9.52(3/8)
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
Ø22.2(7/8)
Ø28.58(1-1/8)
Ø28.58(1-1/8)
Ø34.9(1-3/8)
Ø34.9(1-3/8)
Ø41.3(1-5/8)
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