4.2 Refrigerant Piping System Design
Limit of Piping Length and difference in height
L
Overall Piping Length
(A+B+C1+C2+C3+D+a+b+c+d+e+f+g+i+j+k)
1,000m
L1
Longest pipe length (A+B+C3+D+K)
: between outdoor Unit and the farthest indoor unit
150m (200m**)
Longest pipe Equivalent length*
between outdoor Unit and the farthest indoor unit
175m (225m**)
L2 First outside branch ~ the farthest indoor unit (B+C3+D+k) 40m (90m**)
L3 Length from each indoor unit to the closest HR Unit / Header 40 m**
L4
Length from outdoor branch to outdoor unit (F1,E+F2,E+F3) 10 m
Equivalent length from outdoor branch to outdoor unit * 13 m
H Between outdoor Unit and Indoor Unit 110 m
h1 Between Indoor Unit and Indoor Unit 40 m
h2 Between outdoor Unit and outdoor Unit 5 m
h3 Between Indoor Unit and HR Unit 15 m
h4 Between Indoor Unit and Indoor Unit connected to same HR unit 15 m
“a” Between HR Unit and HR Unit 30 m
“b” Between HR Unit and HR Unit within same branch 5 m
• * 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)
For Heat Recovery System
Upward Outdoor
/Outside unit
total capacity
(HP)
Standard Pipe Diameter
Increased Pipe Diameter
Liquid pipe
[mm(inch)]
Low Pressure
Gas pipe
[mm(inch)]
High Pressure
Gas pipe
[mm(inch)]
Liquid pipe
[mm(inch)]
Low Pressure
Gas pipe
[mm(inch)]
High Pressure
Gas pipe
[mm(inch)]
8 Ø 9.52 (3/8) Ø 19.05 (3/4) Ø 15.88 (5/8) Ø 12.7 (1/2) Not increased Not increased
10 Ø 9.52 (3/8) Ø 19.05 (3/4) Ø 15.88 (5/8) Ø 12.7 (1/2) Not increased Not increased
12 Ø 12.7 (1/2) Ø 22.2 (7/8) Ø 19.05 (3/4) Ø 15.88 (5/8) Not increased Not increased
• Model line up could be different in accordance with target region.
For Heat Pump System
Upward Outdoor
/Outside unit
total capacity
(HP)
Standard Pipe Diameter
Increased Pipe Diameter
Equivalent pipe length is
90m(295ft) or more
from ODU to farthest IDU
When Level difference is
50m or more
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
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
10 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
12 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
• Model line up could be different in accordance with target region.
Installation of Outdoor Unit
4. Refrigerant Piping System
Installation
9
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