Additional Suction Accumulator Line; Example Liquid Line Sizing - Trane RTAA-70 Installation & Maintenance Manual

Table 7

Additional Suction Accumulator Line

Required Length in Feet of Field Installed Suction Line Accumulator
35 Ton Circuit
Liquid Line 2 1/8" O.D.
Length in Suction
Actual Ft. Line
1
20
7
40
14
60
20
80
26
100
32
120
N/A
140
N/A
160
N/A
180
N/A
200
RTAA-SVX01A-EN
Installation — Remote Evaporator
40 Ton Circuit
2 5/8" O.D. 2 1/8" O.D.
Suction Suction
Line Line
1 5
5 14
9 23
13 32
17 N/A
21 N/A
25 N/A
29 N/A
33 N/A
37 N/A

Example Liquid Line Sizing

For this example, refer to
circuit.
1. From Figure 22, the actual length of field installed piping is:
2. Estimate equivalent line length:
3. From Table 4 for a 50 ton circuit, for 175 equivalent feet the OD is
1-3/8 inches.
4. In Figure 22 there are six long-radius elbows. From
1-3/8 inch elbows, the equivalent feet is:
5. Adding equivalent feet from step #4 to step #1 gives:
6. From Table 4, for a 50 ton circuit, for 125 equivalent feet (nearest to
130.2), the OD is 1-1/8 inches
7. From Table 3, for 1-1/8" OD long-radius elbows, the equivalent feet is:
8. Adding equivalent feet from step #7 to step #1 gives:
50 Ton Circuit
2 5/8" O.D. 2 5/8" O.D.
Suction Suction
Line Line
3 9
9 15
15 21
21 28
26 34
32 40
38 46
43 53
49 59
55 65
Table 2, 3, 4, and Figure 22, and assume a 50 ton
80+8+8+21 =117 feet
117 feet x 5=175 feet
6 elbows x 2.2 feet = 13.2 feet
13.2 feet + 117 feet = 130.2 feet
6 elbows x 1.9 feet = 11.4 feet
11.4 feet + 117 feet = 128.4 feet
60 Ton Circuit
3 1/8" O.D. 2 5/8" O.D.
Suction Suction
Line Line
6 14
11 21
15 27
19 33
24 40
28 46
33 52
37 N/A
41 N/A
46 N/A
Table 3, for
31/8"O.D.
Suction
Line
10
15
19
23
28
32
37
41
45
50
39