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1-6. Tubing Size
Table 1-3 Main Tubing Size (LA)
Between No.1 distribution joint for outdoor unit and No.1 distribution joint (for indoor unit)
BTU/h
72,000
(kW)
(21.1)
Total system
6
tonnage
ø3/4"
Gas tubing
(ø19.05)
(ø22.22)
ø3/8"
Liquid tubing
(ø9.52)
*1: If future extension is planned, select the tubing diameter based on the total tonnage after extension.
However, extension is not possible if the resulting tubing size is three ranks higher.
*2: The balance tube (outdoor unit tube) diameter is ø1/4" (6.35mm).
*3: Type 1 tubing should be used for the refrigerant tubes.
n Size of tubing (LO) between outdoor units
Select the size of tubing between outdoor units based on the main tubing size (LA) as given in the table above.
Table 1-4 Main Tubing Size After Distribution (LB, LC...)
Below BTU/h (kW)
Total capacity
after distribution
Over BTU/h (kW)
Gas tubing
Tubing size
Liquid tubing
Note: In case the total capacity of connected indoor units exceeds the total capacity of the outdoor units, select the main tubing size
for the total capacity of the outdoor units.
Table 1-5 Outdoor Unit Tubing Connection Size
BTU/h
72,000
(kW)
(21.1)
ø3/4"
(ø19.05)
Gas tubing
ø3/8" (ø9.52)
Liquid tubing
Balance tubing
Table 1-6 Refrigerant Charge Amount at Shipment (for outdoor unit)
BTU/h (kW)
Initial amount
oz (g)
Table 1-7 Indoor Unit Tubing Connection Size
Indoor unit type
Gas tubing
Liquid tubing
00_302411_EN.indd 9
96,000
120,000
144,000
168,000
(28.1)
(35.2)
(42.2)
(49.2)
8
10
12
14
ø7/8"
ø1-1/8"
(ø28.58)
ø1/2"
(ø12.7)
24,200
54,600
76,800
(7.09)
(16.0)
24,200
54,600
–
(7.09)
ø1/2"
ø5/8"
(ø12.7)
(ø15.88)
(ø19.05)
ø3/8"
ø3/8"
(ø9.52)
(ø9.52)
(ø9.52)
(
A
96,000
120,000
(28.1)
(35.2)
ø7/8"
ø1-1/8"
(ø22.22)
(ø28.58)
Brazing connection
ø3/8" (ø9.52)
ø1/2" (ø12.7)
Flare connection
ø1/4" (ø6.35)
Flare connection
72,000 (21.1)
96,000 (28.1)
120,000 (35.2) 144,000 (42.2)
321 (9,100)
363 (10,300)
300 (8,500)
7
9
12
15
ø1/2" (ø12.7)
ø1/4" (ø6.35)
192,000
216,000
240,000
264,000
(56.3)
(63.3)
(70.3)
(77.4)
16
18
20
ø5/8"
(ø15.88)
102,400
143,300
178,800
(22.5)
(30.0)
(42.0)
(52.4)
76,800
102,400
143,300
(16.0)
(22.5)
(30.0)
(42.0)
ø3/4"
ø7/8"
ø1-1/8"
ø1-1/8"
(ø22.22)
(ø28.58)
(ø28.58)
ø3/8"
ø3/8"
ø1/2"
ø1/2"
(ø9.52)
(ø12.7)
(ø12.7)
–
)
C
Unit: in. (mm)
ex.) type72
144,000
(42.2)
416 (11,800)
18
24
36
ø5/8" (ø15.88)
ø3/8" (ø9.52)
9
Unit: in. (mm)
288,000
312,000
336,000
(84.4)
(91.4)
(98.4)
22
24
26
28
ø1-3/8"
(ø34.92)
ø3/4"
(ø19.05)
Unit: in. (mm)
238,900
340,000
–
(70.0)
(99.6)
178,800
238,900
340,000
(52.4)
(70.0)
(99.6)
ø1-1/8"
ø1-3/8"
ø1-5/8"
(ø28.58)
(ø34.92)
(ø41.28)
ø5/8"
ø3/4"
ø3/4"
(ø15.88)
(ø19.05)
(ø19.05)
Balance
tube
Liquid tube
Gas tube
Unit: in. (mm)
48
54
360,000
(105.5)
30
ø1-5/8"
(ø41.28)
2018/7/4 13:27:17
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