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Installation of Outside Unit
4. Refrigerant Piping System
4.2 Refrigerant piping system design
Limit of Piping Length and difference in height
Overall Piping Length
L
(A+B+C1+C2+C3+D+a+b+c+d+e+f+g+i+j+k)
Longest pipe length (A+B+C3+D+K)
: between outside Unit and the farthest indoor unit
L1
Longest pipe Equivalent length*
between outside Unit and the farthest indoor unit
L2
First outside branch ~ the farthest indoor unit (B+C3+D+k)
L3
Length from each indoor unit to the closest HR Unit / Header
Length from outside branch to outside unit (F1,E+F2,E+F3)
L4
Equivalent length from outside branch to outside unit *
H
Between outside Unit and Indoor Unit
h1
Between Indoor Unit and Indoor Unit
h2
Between outside Unit and outside Unit
h3
Between Indoor Unit and HR Unit
h4
Between Indoor Unit and Indoor Unit connected to same HR unit
"a"
Between HR Unit and HR Unit
"b"
Between HR Unit and HR Unit within same branch
• * Equivalent Length
: Assume equivalent pipe length of Y branch to be 0.5m, that of header to be 1m for calculation purpose.
• ** Conditional application : For branch pipes after "Header", conditional application could not be applied.
• It is recommended that indoor unit is installed at lower position than the header. And Branch pipe can not be used after header.
• HR unit is for Heat Recovery System only.
< ! > WARNING
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 or Gas pipes are
increased in accordance with below table)
- The level difference (Outdoor/Outside unit ↔ Indoor unit) is 50m (164ft) or more (Only liquid pipe is increased)
Refrigerant pipe diameter from outdoor unit to first branch. (A)
Upward Outdoor
/Outside unit
Liquid pipe
total capacity
[mm(inch)]
(HP)
8
Ø 9.52 (3/8)
10
Ø 9.52 (3/8)
12
Ø 12.7 (1/2)
14 ~ 16
Ø 12.7 (1/2)
18 ~ 20
Ø 15.88 (5/8)
22
Ø 15.88 (5/8)
24
Ø 15.88 (5/8)
26 ~ 34
Ø 19.05 (3/4)
36
Ø 19.05 (3/4)
38 ~ 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.
For Heat Recovery System
Standard Pipe Diameter
Low Pressure
High Pressure
Gas pipe
Gas pipe
[mm(inch)]
[mm(inch)]
Ø 19.05 (3/4)
Ø 15.88 (5/8)
Ø 22.2 (7/8)
Ø 19.05 (3/4)
Ø 28.58 (1-1/8)
Ø 19.05 (3/4)
Ø 28.58 (1-1/8)
Ø 22.2 (7/8)
Ø 28.58 (1-1/8)
Ø 22.2 (7/8)
Ø 28.58 (1-1/8)
Ø 28.58 (1-1/8)
Ø 34.9 (1-3/8)
Ø 28.58 (1-1/8)
Ø 34.9 (1-3/8)
Ø 28.58 (1-1/8)
Ø 41.3 (1-5/8)
Ø 28.58 (1-1/8)
Ø 41.3 (1-5/8)
Ø 34.9 (1-3/8)
Ø 41.3 (1-5/8)
Ø 34.9 (1-3/8)
Ø 53.98 (2-1/8)
Ø 41.3 (1-5/8)
Increased Pipe Diameter
Liquid pipe
[mm(inch)]
Ø 12.7 (1/2)
Ø 12.7 (1/2)
Ø 15.88 (5/8)
Ø 15.88 (5/8)
Ø 19.05 (3/4)
Ø 19.05 (3/4)
Ø 19.05 (3/4)
Ø 22.2 (7/8)
Ø 22.2 (7/8)
Ø 22.2 (7/8)
Ø 25.4 (1) *
Ø 25.4 (1) *
6
Installation
300m (500m**)
150m (200m**)
175m (225m**)
40m (90m**)
40 m**
10 m
13 m
50 m
40 m
5 m
15 m
15 m
30 m
5 m
Low Pressure
High Pressure
Gas pipe
Gas pipe
[mm(inch)]
[mm(inch)]
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
Not increased
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