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14
ENGLISH
WARNING
• It is recommended that difference of piping length for pipes
connected to the Indoor Unit is minimized. Performance differ-
ence between Indoor Units may occur.
• 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 in-
creased)
!
Refrigerant pipe diameter from branch to branch (B,C)
Downward Indoor
Unit total capacity
[kW(Btu/h)]
Liquid pipe [mm(inch)] Gas pipe [mm(inch)]
≤ 5.6(19,100)
Ø6.35(1/4) Ø12.7(1/2)
< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)
≤ 22.4(76,400)
Ø9.52(3/8) Ø19.05(3/4)
< 36.4(124,200) Ø9.52(3/8) Ø22.2(7/8)
Refrigerant pipe diameter from outdoor unit to first branch. (A)
Outdoor unit Connection
WARNING
• In case of pipe diameter B connected after first branch is bigger
than the main pipe diameter A, B should be of the same size
with A.
Ex) In case indoor unit combination ratio 120% is connected to
24HP(67.2 kW) outdoor unit.
1) Outdoor unit main pipe diameter A : Ø34.9(Gas pipe),
Ø15.88(liquid pipe)
2) Pipe diameter B after first branch according to 120% indoor
unit ombination(80.6kW) : Ø34.9(gas pipe), Ø19.05(liquid
pipe)
Therefore, pipe diameter B connected after first branch
would be Ø34.9(gas pipe) / Ø15.88(liquid pipe) which is
same with main pipe diameter.
[Example]
Do not choose the main pipe diameter by downward indoor unit
total capacity but its outdoor unit model name.
Do not let the connection pipe from branch to branch exceed the
main pipe diameter chosen by outdoor unit model name.
EX) Where connecting the indoor units to the 22 HP (61.6 kW)
outdoor unit to 130% of its system capacity (80.1 kW) and
branching 7k (2.2kW) indoor unit at the 1st branch.
1) Main pipe diameter(22 HP outdoor unit): Ø28.58(gas pipe),
Ø15.88(Liquid pipe)
2) Pipe diameter between 1st and 2nd branch (77.9kW indoor
units) :
Ø34.9(Gas pipe), Ø19.05(Liquid pipe) in conformity with
downward indoor units.
Since the main pipe diameter of 22HP outdoor unit is
Ø28.58(gas pipe), Ø15.88(Liquid pipe) is used as the main
pipe and the connection pipe between 1st and 2nd branch.
!
Outdoor unit capacity
[Ton]
Liquid pipe
[mm(inch)]
Gas pipe
[mm(inch)]
2, 3, 4 Ø9.52(3/8) Ø15.88(5/8)
4.4, 5 Ø9.52(3/8) Ø19.05(3/4)
Indoor Unit Connection
Indoor Unit connecting pipe from branch (a,b,c,d,e,f)
Indoor Unit capacity
[kW(Btu/h)]
Liquid pipe
[mm(inch)]
Gas pipe [mm(inch)]
≤ 5.6(19,100)
Ø6.35(1/4) Ø12.7(1/2)
< 16.0(54,600) Ø9.52(3/8) Ø15.88(5/8)
< 22.4(76,400) Ø9.52(3/8) Ø19.05(3/4)
< 28.0(95,900) Ø9.52(3/8) Ø22.2(7/8)
CAUTION
• Bending radius should be
at least twice the diameter
of the pipe.
• Bend pipe after
500mm(1.64ft) or more
from branch(or header).
Do not bend U type.
It may cause Performance
unsatisfactory or noise.
!
500mm(1.64ft)
or more
500mm(1.64ft)
or more
The amount of Refrigerant
The calculation of the additional charge should take into account the
length of pipe and CF(correction Factor) value of indoor unit.
Amount refrigerant of Indoor units
Example) 4Way Ceiling Cassette 14.5kW -1ea, Ceiling concealed
Duct 7.3kW-2ea, Wall Mounted 2.3kW-4ea
CF = 0.64 × 1 + 0.26 × 2 + 0.24 × 4 = 2.12kg(4.67lbs)
Attach the additional refrigerant table of IDU.
CAUTION
Do not connect Hydrokit with Multi V S Models.
!
Additional charge(kg) = Total liquid pipe : Ø25.4 mm (1.0 inch) x
0.480 kg/m (0.323 lbs/ft)
+ Total liquid pipe : Ø22.2 mm (7/8 inch) x
0.354 kg/m (0.238 lbs/ft)
+ Total liquid pipe : Ø19.05 mm (3/4 inch) x
0.266 kg/m (0.179 lbs/ft)
+ Total liquid pipe : Ø15.88 mm (5/8 inch) x
0.173 kg/m (0.116 lbs/ft)
+ Total liquid pipe : Ø12.7 mm (1/2inch) x
0.118 kg/m (0.079 lbs/ft)
+ Total liquid pipe : Ø9.52 mm (3/8inch) x
0.061 kg/m (0.041 lbs/ft)
+ Total liquid pipe : Ø6.35 mm (1/4 inch) x
0.022 kg/m (0.015 lbs/ft)
+ CF value of indoor unit
1,MFL67798024,영영 18. 7. 19. 영영 2:14 Page 14
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