Table of Contents
Advertisement
Total pipe length = A+B+C+a+b+c+d+e ≤ 1,000m
Longest pipe length
L
A+B+b ≤ 150m(200m**)
Longest pipe length after 1st branch
B+b ≤ 40m(90m**)
Difference in height (Outdoor Unit ÷ Indoor Unit)
H
H ≤ 110m
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 40m
Difference in height (Outdoor Unit ÷ Outdoor Unit)
h1
h1 ≤ 5m
• * : Assume equivalent pipe length of Y branch to be 0.5m, that of header to be 1m, cal-
culation purpose
• ** : To apply Conditional Application
• Indoor Unit should be installed at lower position than the header.
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 or more
(Liquid and Gas pipes are increased)
- The level difference (Outdoor unit ÷ Indoor unit) is 50m or more (Only liquid pipe is in-
creased)
Refrigerant pipe diameter from outdoor unit to first branch. (A)
Upward Out-
door unit
Standard Pipe Diameter
total capacity
Liquid pipe
HP
[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) Ø 28.58(1-1/8) Ø 19.05(3/4)
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 ~ 82
Ø 22.2(7/8)
* If the step up size is not available, you can not select the next higher size available.
PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
When pipe length is 90m or
more from ODU to 1st branch
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) not increased Ø 15.88(5/8) not increased
Ø 28.58(1-1/8) 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
Ø 34.9(1-3/8)
Ø 22.2(7/8)
Ø 41.3(1-5/8)
Ø 22.2(7/8)
Ø 44.5(1-3/4)
Ø 25.4(1)
Ø 53.98(2-1/8)
Ø 25.4(1)
*Equivalent pipe length
A+B+b ≤ 175m(225m**)
Increased Pipe Diameter
When level difference is 50m
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)
Ø 31.8(1-1/4)
Ø 15.88(5/8) not increased
Ø 31.8(1-1/4)
Ø 19.05(3/4) not increased
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)
39
or more
Gas pipe
[mm(inch)]
not increased
not increased
not increased
not increased
not increased
not increased
Hide quick links:
Advertisement
Table of Contents
