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36 Outside Unit
‘ Indoor unit connecting pipe from branch (a~f)
‘ Equivalent piping length for Y Branch and other pipes can be calculated with following table.
Indoor unit capacity [kW(Btu/h)]
≤ 5.6(19,100)
< 16.0(54,600)
< 22.4(76,400)
< 33(112,600)
Ø6.35(1/4)
Ø9.52(3/8)
Ø9.52(3/8)
Ø9.52(3/8)
Ø12.7(1/2)
Ø15.88(5/8)
Ø19.05(3/4)
Ø22.2(7/8)
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
• When the pipe diameter (B) connected after 1st branching is larger than the main pipe diameter (A), Install the pipe with the pipe
diameter (B) after 1st branching that is the same as the main pipe diameter (A). Ex) When connecting with 120% of the indoor unit to
10 HP.
1) Outside unit main pipe diameter:
Ø
22.2(7/8) (Gas pipe) /
Ø
9.52(3/8) (Liquid pipe)
2) Pipe diameter after 1st branching by 120% indoor unit combination :
Ø
28.58(1-1/8) (Gas pipe) /
Ø
12.7(1/2) (Liquid pipe)
Therefore set the pipe diameter (B) after 1st branching to
Ø
22.2(7/8) (Gas pipe) /
Ø
9.52(3/8) (Liquid pipe) of main pipe diameter (A).
• For the pipe length after the header branch (c~e), it is recommended to install the unit so that the difference of the pipe distance con-
nected to the indoor unit is minimized.
• The large difference in pipe distance can cause performance difference between indoor units.
• After the header branch, you cannot use the Y branch and header branch.
• When the pipe distance corresponding to the farthest indoor unit from the outside unit is 90m(295ft) or above, you must change the
main pipe diameter according to the outside unit capacity in accordance with the following table.
(This applies to both the liquid and gas pipes.)
Piping length from outdoor branch to outdoor unit ≤ 10m(32.8ft), equivalent length : max 13m(42.7ft) (for 18HP)
Conditional Application
To satisfy below condition to mak 40m ~ 90m(131ft ~ 295ft) of pipe length after first branch.
1) 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(1/4 inch) ’ Ø9.52(3/8 inch) ’ Ø12.7(1/2 inch) ’ Ø15.88(5/8 inch) ’ Ø19.05(3/4 inch) ’ Ø22.2(7/8 inch) ’ Ø25.4*(1 inch),
Ø28.58(1-1/8 inch) ’ Ø31.8*(1-1/4 inch), Ø34.9(1-3/8 inch) ’ Ø38.1*(1-1/2 inch)
* : It is not necessary to size up.
h
If available on site, it use this size. Otherwise it can't be increased.
2) Length of pipe from each indoor unit to the closest branch (a,b,c,d,e,e) ≤ 40m(131ft)
3) [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)] ≤ 40m(131ft)
Indoor unit connection
Note
Refrigerant piping system
Gas Pipe Liquid Pipe
40,48,50,60HP ............................................Ø41.3(1-5/8) 40,48,50,60HP ............................................Ø19.05(3/4) ’ Ø22.2(7/8)
Pipe
Ø6.35 Ø9.52 Ø12.7 Ø15.88 Ø19.05 Ø22.2 Ø25.4 Ø28.58 Ø31.8 Ø34.9 Ø38.1 Ø41.3 Ø44.5 Ø53.98
(1/4") (3/8") (1/2") (5/8") (3/4") (7/8") (1") (1 1/8") (1 1/4") (1 3/8") (1 1/2") (1 5/8") (1 3/4") (2 1/8")
Elbow
0.16 m 0.18 m 0.2 m 0.25 m 0.35 m 0.4 m 0.45 m 0.5 m 0.55 m 0.6 m 0.65 m 0.7 m 0.75 m 0.85 m
(0.53 ft) (0.59 ft) (0.66 ft) (0.82 ft) (1.15 ft) (1.31 ft) (1.48 ft) (1.64 ft) (1.80 ft) (1.97 ft) (2.13 ft) (2.30 ft) (2.46 ft) (2.79 ft)
Y Branch 0.5 m(1.64 ft)
Header 1.0 m(3.28 ft)
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