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
l 40m(131ft) (90m(295ft) : Conditional application)
H 110m(361ft)
40m(131ft)
L150m(492ft) (200m(656ft) : Conditional application)
Master
Master
Slave
Slave
Master
Slave
10m
(33ft)
or
less
l 40m(131ft) (90m(295ft) : Conditional application)
H 110m(361ft)
L150m(492ft) (200m(656ft) : Conditional application)
ODU Capacity
Master ≥ Slave
40m(131ft)
Piping length from outdoor branch to outdoor unit ≤ 10m(33ft), equivalent length : max
13m(43ft) (for 14Ton or more)
Additional Application
To satisfy below condition to make 40m(131ft) ~ 90m(295ft) 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
Ø1/4(6.35mm)’Ø3/8(9.52mm)’Ø1/2(12.7mm)’Ø5/8(15.88mm)’Ø3/4(19.05mm)’
Ø7/8(22.2mm)’Ø1(25.4)*, Ø1-1/8(28.58mm)’Ø1-1/4(31.8mm)*,Ø1-3/8(34.9mm)’
Ø1-1/2(38.1mm)* ’Ø1-5/8(41.3mm)
* : It is not necessary to size up.
h If the step up size is not available, you can not select the next higher size available.
•
While calculating whole refrigerant pipe length, pipe B,C,D length should be calculated twice.
A+Bx2+Cx2+Dx2+a+b+c+d+e ≤ 1000m(3281ft)
• Length of pipe from each indoor unit to the closest branch (a,b,c,d,e) ≤ 40m(131ft)
• [Length of pipe from outdoor unit to the farthest indoor unit 5 (A+B+C+D+e)]
- [Length of pipe from outdoor unit to the closest indoor unit 1 (A+a)] ≤ 40m(131ft)
28
PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT
ENGLISH
Refrigerant piping system
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