Installation Manual
37
ENGLISH
Refrigerant piping system
‘
Indoor unit connecting pipe from branch (a~f)
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: 22.2 (Gas pipe) / 9.52 (Liquid pipe)
2) Pipe diameter after 1st branching by 120% indoor unit combination : 28.58 (Gas pipe) / 12.7 (Liquid pipe)
Therefore set the pipe diameter (B) after 1st branching to 22.2 (Gas pipe) / 9.52 (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 connected 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 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.)
Indoor unit connection
(**)Conditional Application (Incase of D10 is farthest indoor)
Below condition must be satisfied for 40 ~ 90m piping 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 (Main pipe diameter).
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.
h
If available on site, it use this size. Otherwise it can't be increased.
2) While calculating total refrigerant piping length, pipe B, C, D length should be calculated twice
A+Bx2+Cx2+Dx2+a+b+c+d+e ≤ 500 m
2) Length of pipe from each indoor unit to the closest branch (a,b,c,d,e) ≤ 40 m
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)] ≤ 40 m
Gas pipe (mm)
Liquid pipe (mm)
42, 44, 46, 48, 50, 52, 54, 56, 58, 60HP
…………Ø 41.3
42, 44, 46, 48, 50, 52, 54, 56, 58, 60HP
…………Ø 19.05
’
Ø 22.2
Summary of Contents for MULTI V WATER II ARWN Series
Page 81: ......
