LG Multi V PRHR042A Installation Manual page 19

Refrigerant pipe diameter from outdoor unit to first branch. (A)
Upward outdoor
unit total capacity
Ton Liquid mm(inch)
Ø9.52
3,4,5
(3/8)
* If available on site, it use this size. Otherwise it can't be increased.
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)
Total pipe length = A+B+C1+C2+C3+D+a+b+c+d+e+f+g+i+j+k+l+m+n
≤ 300m(984ft)
Longest pipe length
L
A+B+C3+D+k ≤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)
Difference in height (Indoor Unit ÷ Indoor Unit)
h
h ≤ 15m(49ft)
Difference in height(HR unit ÷ HR unit)
"a", "b"
a ≤ 15m(49ft) , b ≤ 5m(16ft)
• * : Assume equivalent pipe length of Y branch to be 500mm(19-
5/8inch), that of header to be 1000mm(39-1/4inch), calculation
purpose
• It is recommended that indoor unit is installed at lower position
than the header.
Pipe diameter
Low pressure gas High pressure gas
pipe pipe
mm(inch) mm(inch)
Ø19.05 Ø15.88
(3/4) (5/8)
Gas pipe [mm(inch)]
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
*Equivalent pipe length
A+B+C3+D+k ≤175m(574ft)
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, High pressure gas pipes
and Low pressure gas pipes are increased)
- The level difference (Outdoor 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 unit Pipe diameter
total capacity
Low
Liquid pressure
Ton
mm(inch) gas pipe
mm(inch)
Ø9.52 Ø19.05
3,4,5
(3/8) (3/4)
Pipe diameter when pipe
length is ≥ 90m(295 ft)
High Low High
pressure Liquid pressure pressure
gas pipe mm(inch) gas pipe gas pipe
mm(inch) mm(inch) mm(inch)
Ø15.88 Ø 12.7 Ø 22.2 Ø 19.05
(5/8) (1/2) (7/8) (3/4)
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