9
S4179544
*
For the 25 type, use the “Tube connector” (supplied with the unit) for sizing up a narrow tube from 6.35 to
9.52.
1-7. Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table 1-13
Straight Equivalent Length of Joints
Wide tube (gas side)
ø12.7
ø15.88
ø19.05
ø22.22
ø25.4
ø28.58
90
°
elbow
0.3
0.35
0.42
0.48
0.52
0.57
45
°
elbow
0.23
0.26
0.32
0.36
0.39
0.43
U-bend
0.9
1.05
1.26
1.44
1.56
1.71
Trap bend (R60 - 100 mm)
2.3
2.8
3.2
3.8
4.3
4.7
Y-branch
Equivalent length conversion not needed
Ball valve for servicing
Equivalent length conversion not needed
>
>
Less than
7.3 (25,000)
Q
7.3
15.88 (5/8) or
19.05 (3/4)
9.52 (3/8)
70 type
25.4 (1)
12.7 (1/2)
48 type
19.05 (3/4)
9.52 (3/8)
90 type
28.58 (1 1/8)
12.7 (1/2)
>
More than
22.4 (76,400)
Q > 22.4
28.58 (1 1/8)
12.7 (1/2)
1-6. Tubing Size
Table 1-11
Main Tubing Size (LA, LB, LC)
Main tube (LA) O. D.
Main tube (LB, LC) OD
Outdoor unit
Total cooling capacity Q kw, (BTU/h),
of the unit(s) after the main tube
Unit: mm (in.)
Wide
tube
Narrow
tube
Table 1-12
Distribution Branch Size (
lllll
1
,
lllll
2
,
lllll
3
,
lllll
4
)
Indoor unit type
9 type
12 type
18 type
25 type
36 type
48 type
Wide tube
12.7 (1/2)
15.88 (5/8)
19.05 (3/4)
Narrow tube
9.52 (3/8)*
NOTE
Unit: mm (in.)
22.4 (76,400) or less
but more than
16.0 (54,600)
22.4 Q > 16.0
25.4 (1)
12.7 (1/2)
16.0 (54,600) or less
but more than
7.3 (25,000)
16.0 Q > 7.3
19.05 (3/4)
9.52 (3/8)
Unit: m