Refrigerant Piping System - LG Multi V PRHR042A Installation Manual

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Refrigerant piping system

Y branch method
Example : 5 Indoor Units
connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Indoor Units
Total pipe length = A+B+C+D+a+b+c+d+e ≤ 300m(984ft)
Longest pipe length
L
A+B+C+D+e ≤ 150m(492ft)
Longest pipe length after 1st branch
B+C+D+e ≤ 40m(131ft)
Difference in height (Outdoor Unit ÷ Indoor Unit)
H
H ≤ 50m(164ft)(40m(131ft) : Outdoor Unit is lower than Indoor Units)
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 15m(49ft)
• * : Assume equivalent pipe length of Y branch to be 0.5m(1.6ft),
that of header to be 1m(3,3ft), calculation purpose
Refrigerant pipe diameter from outdoor unit to first branch. (A)
Outdoor unit capacity Liquid pipe
[Ton] [mm(inch)]
3, 4 Ø9.52(3/8)
Refrigerant pipe diameter from branch to branch (B,C,D)
Downward Indoor
Unit total capacity Liquid pipe [mm(inch)]
[kW(Btu/h)]
≤ 5.6(19,100)
Ø6.35(1/4)
< 16.0(54,600) Ø9.52(3/8)
≤ 22.4(76,400)
Ø9.52(3/8)
< 36.4(124,200) Ø9.52(3/8)
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 or more
(Liquid and Gas pipes are increased)
- The level difference (Outdoor unit ÷ Indoor unit) is 50m or more
(Only liquid pipe is increased)
[Unit:m(ft)]
L150 (492)
l 40 (131)
h15(49)
Equivalent pipe length(*)
A+B+C+D+e ≤ 175m(574ft)
Gas pipe
[mm(inch)]
Ø15.88(5/8)
Gas pipe [mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
Header Method
Example : 6 Indoor Units
connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch
Ⓒ : Indoor Units
Ⓓ : Sealed piping
Total pipe length = A+a+b+c+d+e+f ≤ 300m(984ft)
Longest pipe length
L
A+f ≤ 150m(492ft)
Longest pipe length after 1st branch
f ≤ 40m(131ft)
Difference in height (Outdoor Unit ÷ Indoor Unit)
H
H ≤ 50m(164ft)(40m(131ft) : Outdoor Unit is lower than Indoor Units)
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 15m(49ft)
WARNING
!
Pipe length after header branching (a~f)
It is recommended that difference in length of the pipes
connected to the Indoor Units is minimized. Performance
difference between Indoor Units may occur.
• * : Assume equivalent pipe length of Y branch to be 0.5m(1.6ft),
that of header to be 1m(3.3ft), calculation purpose
• Indoor Unit should be installed at lower position than the header.
Combination of Y
branch/header Method
Example : 5 Indoor Units
connected
Ⓐ : Outdoor Unit
Ⓑ : 1st branch (Y branch)
Ⓒ : Y branch
Ⓓ : Indoor Unit
Ⓔ : Header
Ⓕ : Sealed piping
Branch pipe can not be used after header
Total pipe length = A+B+C+a+b+c+d+e ≤ 300m(984ft)
Longest pipe length
L
A+B+b ≤ 150m(492ft)
Longest pipe length after 1st branch
B+b ≤ 40m(131ft)
Difference in height (Outdoor Unit ÷ Indoor Unit)
H
H ≤ 50m(164ft) (40m(131ft) : Outdoor Unit is lower than Indoor Units)
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 15m(49ft)
• * : Assume equivalent pipe length of Y branch to be 0.5m(1.6ft),
that of header to be 1m(3.3ft), calculation purpose
• Indoor Unit should be installed at lower position than the header.
[Unit:m(ft)]
L150 (492)
40 (131)
h15(49)
Equivalent pipe length(*)
A+f ≤ 175m(574ft)
[Unit:m(ft)]
L150 (492)
40 (131)
Equivalent pipe length(*)
A+B+b ≤ 175m(574ft)