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1-6. Tubing Size
Table 1-9 Main Tubing Size (LA)
32
249,100
(73.0)
26
ø7/8"
(ø22.22)
10
95,500
(28.0)
ø1/2"
(ø12.7)
153,600
(45.0)
16
ø1-1/8"
(ø28.58)
ø5/8"
(ø15.88)
10
10
16
10
16
16
191,100
(56.0)
20
ø3/4"
(ø19.05)
ø1-1/4"
(ø31.75)
ø3/8"
(ø9.52)
307,100
(90.0)
1610
BTU/h
(kW)
Total system horsepower
Combined outdoor units
Gas tubing
Liquid tubing
*1: If future extension is planned, select the tubing diameter based on the total horsepower 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 1-9 and Table 1-14.)
*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.
ø7/8"
(ø22.22)
ø3/8" (ø9.52)
ø1/4" (ø6.35)
95,500
(28.0)
153,600
(45.0)
ø1-1/8"
(ø28.58)
Flare connection
Brazing connection
ø1/2" (ø12.7)
Flare connection
( A – C)
Balance tubing
Liquid tubing
Gas tubing
BTU/h
(kW)
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 1-11 Outdoor Unit Tubing Connection Size
Table 1-12 Indoor Unit Tubing Connection Size
Balance tube
Liquid tube
Gas tube
ø5/8" (ø15.88)
ø3/8" (ø9.52)ø1/4" (ø6.35)
ø1/2" (ø12.7)
Gas tubing
Liquid tubing
Indoor unit type7 9 12 18 24 3648
Note: Use C1220T-1/2H material for tubing over ø3/4" (ø22.22).
ø3/4"
(ø19.05)
ø1-1/2"
(ø38.1)
ø3/4"
(ø19.05)
ø1-1/4"
(ø31.75)
ø5/8"
(ø15.88)
ø1-1/8"
(ø28.58)
ø1/2"
(ø12.7)
ø1"
(ø25.4)
ø3/8"
(ø9.52)
ø3/4"
(ø19.05)
ø3/8"
(ø9.52)
ø5/8"
(ø15.88)
ø3/8"
(ø9.52)
ø1/2"
(ø12.7)
Gas tubing
Liquid tubing
–
238,900
(25 hp)
178,800
(19 hp)
ø1/2"
(ø12.7)
ø1-1/8"
(ø28.58)
178,800
(19 hp)
143,300
(15 hp)
24,200
(2.5 hp)
24,200
(2.5 hp)
334,400
(35 hp)
–
334,400
(35 hp)
54,600
(6 hp)
54,600
(6 hp)
238,900
(25 hp)
76,800
(8.1 hp)
ø3/8"
(ø9.52)
ø7/8"
(ø22.22)
76,800
(8.1 hp)
102,400
(11 hp)
102,400
(11 hp)
Below BTU/h
Over BTU/h
143,300
(15 hp)
hp = horsepower
Tubing size
Total capacity
after distribution
Table 1-10 Main Tubing Size After Distribution (LB, LC...)
Unit: in. (mm)
Unit: in. (mm)
Unit: in. (mm)
Unit: in. (mm)
07-007 W-2WAY_II_NA 1/23/07 6:09 PM Page 12