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1-6. Tubing Size
Table 1-3 Main Tubing Size (LA)
BTU/h
72,000
(kW)
(21.1)
Total system tonnage
6
U-72ME1U9(E)
Combined outdoor models
o3/4"
Gas tubing
(o19.05)
Liquid tubing
*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 two ranks higher.
*2: The balance tube (outdoor unit tube) diameter is ø1/4".
*3: Type 1 tubing should be used for the refrigerant tubes.
*4: If the length of the longest tube (L1) exceeds 295 ft. (equivalent length), increase the main tube (LM) size by 1 rank for the gas
and liquid tubes. (Use field-supply reducers.) (Select from Table 1-3 and Table 1-9.)
*5: If the longest main tube length (LM) exceeds 164 ft., increase the main tube size at the portion before 164 ft. by 1 rank for the
gas tubes.
(For the portion that exceeds 164 ft., set based on the main tube sizes (LA) listed in the table above.)
■ 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
Total capacity
after distribution
Over BTU/h
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. (Especially the main tubing segments of LA, LB and LF.)
Table 1-5 Outdoor Unit Tubing Connection Size
BTU/h
72,000
(kW)
(21.1)
ø3/4" *
Gas tubing
(ø19.05) *
ø3/8" (ø9.52)
Liquid tubing
Balance tubing
*1 If the size of tubing (LA) is less than 16.4 feet, it is recommended
that the tubing diameter be larger than ø7/8" (ø22.22).
*2 If the size of tubing (LA) is less than 16.4 feet, it is recommended
that the tubing diameter be larger than ø1-1/8" (ø28.58).
Table 1-6 Refrigerant Charge Amount at Shipment (for outdoor unit)
U-72ME1U9, U-72ME1U9E
DC
(oz)
416
Table 1-7 Indoor Unit Tubing Connection Size
Indoor unit type
7
Gas tubing
Liquid tubing
Note: Use C1220T-1/2H material for tubing over ø3/4" (ø22.22).
96,000
139,000
168,000
(28.1)
(40.7)
(49.2)
8
12
14
U-96ME1U9(E)
U-72ME1U9(E)
U-72ME1U9(E)
U-72ME1U9(E)
U-96ME1U9(E)
o7/8"
(o22.22)
o3/8"
o1/2"
(o9.52)
(o12.7)
76,800
102,400
24,200
54,600
–
24,200
54,600
ø1/2"
ø5/8"
ø3/4"
(ø12.7)
(ø15.88)
(ø19.05)
(ø22.22)
ø3/8"
ø3/8"
ø3/8"
(ø9.52)
(ø9.52)
(ø9.52)
96,000
(28.1)
1
ø7/8" *
2
1
2
(ø22.22)*
Brazing connection
ø3/8" (ø9.52)
Flare connection
ø1/4" (ø6.35)
Flare connection
Unit: in. (mm)
U-96ME1U9, U-96ME1U9E
416
9
12
15
18
o1/2" (o12.7)
o1/4" (o6.35)
9
192,000
203,000
240,000
(56.3)
(59.5)
(70.3)
16
18
U-96ME1U9(E)
U-72ME1U9(E)
U-96ME1U9(E)
U-96ME1U9(E)
U-72ME1U9(E)
U-72ME1U9(E)
U-72ME1U9(E)
U-72ME1U9(E)
o1-1/8"
(o28.58)
o5/8"
(o15.88)
143,300
178,800
238,900
76,800
102,400
143,300
178,800
ø7/8"
ø1-1/8"
ø1-1/8"
ø1-1/8"
(ø28.58)
(ø28.58)
(ø28.58)
ø3/8"
ø1/2"
ø1/2"
ø5/8"
(ø9.52)
(ø12.7)
(ø12.7)
(ø15.88)
(
–
)
A
C
Balance tube
Liquid tube
19
24
36
o5/8" (o15.88)
o3/8" (o9.52)
Unit: in. (mm)
264,000
288,000
(77.4)
(84.4)
20
22
24
U-96ME1U9(E)
U-96ME1U9(E)
U-96ME1U9(E)
U-96ME1U9(E)
U-72ME1U9(E)
U-96ME1U9(E)
o1-3/8"
(o34.92)
o3/4"
(o19.05)
Unit: in. (mm)
–
334,400
238,900
334,400
ø1-3/8"
ø1-3/8"
(ø34.92)
(ø34.92)
ø3/4"
ø3/4"
(ø19.05)
(ø19.05)
Gas tube
Unit: in. (mm)
48
54
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