9
*6: If any of the tubing length exceeds 98ft. (30m), increase the size of the tubes (liquid tube, suction tube and discharge tube)
between the distribution tube and solenoid valve kit by 1 rank and also increase the size of the tubes (liquid tube and gas tube)
between the solenoid valve kit and indoor unit by 1 rank.
* However, in the case of the Type 56 solenoid valve kit, it is not necessary to increase the tubes (liquid tube, suction tube and
discharge tube) between the distribution tube and solenoid valve kit by 1 rank.
7: If the size of suction tubes is ø1-5/8 in. (41.28mm), do not increase the size by 1 rank for the suction tubes.
1-6. Tubing Size
Table 3 Main Tubing Size (LA)
Between 1st distribution joint for outdoor unit and 1st distribution joint (for indoor unit)
Unit: in. (mm)
BTU/h
(kW)
72,000
(21.1)
96,000
(28.1)
120,000
(35.2)
144,000
(42.2)
168,000
(49.2)
192,000
(56.3)
216,000
(63.3)
240,000
(70.3)
264,000
(77.4)
288,000
(84.4)
312,000
(91.4)
336,000
(98.4)
360,000
(105.5)
Total system
tonnage
6
8
10
12
14
16
18
20
22
24
26
28
30
Suction
tubing
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø1-1/8"
(ø28.58)
ø1-3/8"
(ø34.92)
ø1-5/8"
(ø41.28)
Discharge
tubing
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø1-1/8"
(ø28.58)
Liquid tubing
ø3/8"
(ø9.52)
ø1/2"
(ø12.7)
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
* 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.
* The balance tube (outdoor unit tube) diameter is ø1/4" (6.35mm).
* 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 4 Main Tubing Size After Distribution (LB, LC...)
Unit: in. (mm)
Total capacity
after distribution
Below BTU/h (kW)
24,200
(7.09)
54,600
(16.0)
85,300
(25.0)
102,400
(30.0)
124,200
(36.4)
143,300
(42.0)
162,400
(47.6)
200,600
(58.8)
Over BTU/h (kW)
–
24,200
(7.09)
54,600
(16.0)
85,300
(25.0)
102,400
(30.0)
124,200
(36.4)
143,300
(42.0)
162,400
(47.6)
Tubing size
Suction tubing
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
Discharge tubing
ø1/2"
(ø12.7)
ø5/8"
(ø15.88)
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø7/8"
(ø22.22)
ø7/8"
(ø22.22)
Liquid tubing
ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø3/8"
(ø9.52)
ø1/2"
(ø12.7)
ø1/2"
(ø12.7)
ø1/2"
(ø12.7)
ø5/8"
(ø15.88)
Total capacity
after distribution
Below BTU/h (kW)
238,900
(70.0)
340,000
(99.6)
–
Over BTU/h (kW)
200,600
(58.8)
238,900
(70.0)
340,000
(99.6)
Tubing size
Suction tubing
ø1-1/8"
(ø28.58)
ø1-3/8"
(ø34.92)
ø1-5/8"
(ø41.28)
Discharge tubing
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
ø1-1/8"
(ø28.58)
Liquid tubing
ø5/8"
(ø15.88)
ø3/4"
(ø19.05)
ø3/4"
(ø19.05)
Table 5 Outdoor Unit Tubing Connection Size (
A
–
C
)
Unit: in. (mm)
BTU/h
(kW)
72,000
(21.1)
96,000
(28.1)
120,000
(35.2)
144,000
(42.2)
Suction tubing
ø3/4"
(ø19.05)
ø7/8"
(ø22.22)
ø1-1/8"
(ø28.58)
Brazing connection
Discharge
tubing
ø5/8" (ø15.88) ø3/4" (ø19.05)
ø7/8" (ø22.22)
Flare connection
Brazing connection
Liquid tubing
ø3/8" (ø9.52)
ø1/2" (ø12.7)
Flare connection
Balance tubing
ø1/4" (ø6.35)
Flare connection
ex.) Type 72
Liquid tube
Discharge tube
Suction tube
Balance tube
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.
01_302412_Eng.indd 9
2018/7/4 13:30:27
