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40
PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
ENGLISH
• * : Assume equivalent piping length of Y branch to be 0.5m(1.64ft), that of header to be
1m(3.28ft), calculation purpose.
• ** : To apply Conditional Application
• Indoor Unit should be installed at lower position than the header.
Total pipe length = A+B+C+a+b+c+d+e ≤ 1000m(3281ft)
L
Longest pipe length *Equivalent pipe length
A+B+b ≤ 150m(492ft)[200m(656ft)**] A+B+b ≤ 175m(574ft)[225m(738ft)**]
l
Longest pipe length after 1st branch
B+b ≤ 40m(131ft)[90m(295ft)**]
H
Difference in height (Outdoor Unit ÷ Indoor Unit)
H ≤ 110m(361ft)
h
Difference in height (Indoor Unit ÷ Indoor Unit)
h ≤ 40m(131ft)
h1
Difference in height (Outdoor Unit ÷ Outdoor Unit)
h1 ≤ 5m(16ft)
Refrigerant pipe diameter from outdoor unit to first branch. (A)
Upward Outdoor
unit
total capacity
Standard Pipe Diameter
Increased Pipe Diameter
When pipe length is 90m or
more from ODU to 1st branch
When level difference is
50m or more
Ton HP
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
6 8 Ø 9.52(3/8) Ø 19.05(3/4) Ø 12.7(1/2) Ø 22.2(7/8) Ø 12.7(1/2) not increased
8 10 Ø 9.52(3/8) Ø 22.2(7/8) Ø 12.7(1/2) Ø 25.4(1) Ø 12.7(1/2) not increased
10 ~ 12 12 ~ 14 Ø 12.7(1/2) Ø 28.58(1-1/8) Ø 15.88(5/8) not increased Ø 15.88(5/8) not increased
*12, ** 14,
14~18
*14, ** 18,
18~22
Ø 15.88(5/8) Ø 28.58(1-1/8) Ø 19.05(3/4) Ø 31.8(1-1/4) Ø 19.05(3/4) not increased
20 24 Ø 15.88(5/8) Ø 34.9(1-3/8) Ø 19.05(3/4) not increased Ø 19.05(3/4) not increased
22 ~ 28 26 ~ 34 Ø 19.05(3/4) Ø 34.9(1-3/8) Ø 22.2(7/8) Ø 38.1(1-1/2) Ø 22.2(7/8) not increased
32 ~ 36 38 ~ 42 Ø 19.05(3/4) Ø 41.3(1-5/8) Ø 22.2(7/8) not increased Ø 22.2(7/8) not increased
38 ~ 42 46 ~ 50 Ø 19.05(3/4) Ø 41.3(1-5/8) Ø 22.2(7/8) not increased Ø 22.2(7/8) not increased
WARNING
• It is recommended that difference of piping length for pipes connected to the Indoor Unit
is minimized. Performance difference between Indoor Units may occur.
• When the any one (or both ) of below conditions are satisfied, the diameter of main pipe
(A) must be increased according to below table.
- The equivalent length between outdoor unit and the farthest indoor unit is 90m(295ft) or
more (Liquid and Gas pipes are increased)
- The level difference (Outdoor unit ÷ Indoor unit) is 50m(164ft) or more (Only liquid pipe
is increased)
!
• * : ARUN145*TE4(14HP, 12Ton), ** : ARUN169*TE4(18HP, 14Ton)
• If the step up size is not available, you can not select the next higher size available.
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