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Refrigerant piping system
34 Outside Unit
Ú Refrigerant pipe diameter between branches and HR units (B,C,D)
Ú
Total pipe length (A+B+C1+C2+C3+D+a+b+c+d+e+f+g+i+j+k) ≤ 300m(984ft) (500m(1640ft)*)
Downward indoor unit total capacity
[kW(Btu/h)]
≤ 5.6 (19,100) Ø6.35(1/4) Ø12.7(1/2) Ø9.52(3/8)
< 16.0 (54,600) Ø9.52(3/8) Ø15.88(5/8) Ø12.7(1/2)
< 22.4 (76,400) Ø9.52(3/8) Ø19.05(3/4) Ø15.88(5/8)
< 33 (112,600) Ø9.52(3/8) Ø22.2(7/8) Ø19.05(3/4)
< 47 (160,400) Ø12.7(1/2) Ø28.58(1-1/8) Ø22.2(7/8)
< 71 (242,300) Ø15.88(5/8) Ø28.58(1-1/8) Ø28.58(1-1/8)
< 104 (354,900) Ø19.05(3/4) Ø34.9(1-3/8) Ø28.58(1-1/8)
104 (354,900) ≤ Ø19.05(3/4) Ø41.3(1-5/8) Ø28.58(1 -1/8)
Liquid pipe
[mm(inch)]
Low pressure High pressure
Gas pipe [mm(inch)]
Outdoor unit ~ the farthest indoor unit Equivalent pipe length
A+B+C3+D+K ≤ 150m(492ft)(200m(656ft))(*) A+B+C3+D+K ≤ 175m(574ft)(225m(738ft))(*)
HR Unit ~ neighboring HR Unit
D≤ 10m(33ft)
First indoor branch ~ the farthest indoor unit
B+C3+D+k ≤ 90m(295ft)(*)
First outdoor branch ~ the farthest outdoor unit
E+F3 ≤ 10m(33ft)
Difference in height (outdoor unit ÷ indoor unit)
H ≤ 100m(328ft)
Difference in height (indoor ~ indoor unit)
H ≤ 15m(49ft)
Piping length from each indoor unit to the closest HR Unit
a,b,c,d,e,f,g, i, j, k ≤ 40m(131ft)
E1 ~
D10
C3 ~ C4
B1 ~
D10
E1 ~
A3
H
h
g, I, j, k
CAUTION
• Assume equivalent pipe
length of Y branch to be
0.5m(1.6ft), calculation
purpose.
CAUTION:
• Should not be exceed
10m(33ft) between
neighboring HR unit.
• Serial connection of
HR units : Capacity
sum of indoor units ≤
160kBtu/hr.
(*) Conditional Application (Incase of D10 is the farthest indoor)
Below condition must be satisfied for 40m ~ 90m(131ft ~ 295ft) piping length after first branch.
1) Diameter of pipes between first branch and the last branch should be increased by one step,
except if the pipe diameter B,C3,D is same as Diameter A (Main pipe diameter)
Ø6.35 ’ Ø9.52 ’ Ø12.7 ’ Ø15.88 ’ Ø19.05 ’ Ø22.2 ’ Ø25.4*,
Ø28.58 ’ Ø31.8*, Ø34.9 ’ Ø38.1*
* : 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,C3,D length should be calculated twice
A+Bx2+C3x2+Dx2+C1+C2+a+B+C+D+e+f+g+i+j+k ≤ 500m(1640ft)
2) Length of pipe from each indoor unit to the closest HR Unit (a,b,c,d,e,f,g,i,j,k) ≤ 40m(131ft)
3) [Length of pipe from outdoor unit to the farthest indoor unit D10 (A+B+C+D+k)]
• [Length of pipe outdoor unit to the closest indoor unit D1 (C1+a)] ≤ 40m(131ft)
Note:
Equivalent piping length for Y Branch and other pipes can be calculated with following table.
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)
HR Unit 2.5 m (8.20 ft)
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