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PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
32
Refrigerant piping system
Y branch method
1 Outdoor Units
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
2 Outdoor Units
Example : 5 Indoor Units connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Ⓓ : Downward Indoor Unit
Ⓔ : Connection branch pipe between Outdoor
units: ARCNN21
Piping length from outdoor branch to outdoor unit ≤10m, equivalent length:max 13m
(for 22HP or more)
Conditional Application
To satisfy below condition to make 40 m ~ 90 m of pipe length after first branch.
• Diameter of pipes between first branch and the last branch should be increased by one
step, except pipe diameter B,C,D is same as Diameter A
Ø6.35 ' Ø 9.52 ' Ø 12.7 ' Ø 15.88 ' Ø 19.05 ' Ø 22.2 ' Ø 25.4*, Ø 28.58 ' Ø 31.8*,
Ø 34.9 ' Ø 38.1*
* : It is not necessary to size up.
• While calculating whole refrigerant pipe length, pipe B,C,D length should be calculated
twice.
A+Bx2+Cx2+Dx2+a+b+c+d+e ≤ 1,000 m
• Length of pipe from each indoor unit to the closest branch (a,b,c,d,e) ≤ 40 m
• [Length of pipe from outdoor unit to the farthest indoor unit 5 (A+B+C+D+e)]
- [Length of pipe outdoor unit to the closest indoor unit 1 (A+a)] ≤ 40 m
L150m (200 m : Conditional application)
l 40m (90 m : Conditional application)
h 40m
Slave
Slave
Master
Slave
Master
10m or
less
h1
L150m (200 m : Conditional application)
l 40m (90 m : Conditional application)
h 40m
Master
ODU Capacity
Master ≥ Slave
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