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54 RTAC-SVX01F-EN
Installation - Mechanical
Remote Evaporator Option
Liquid Line Sizing Steps
The steps to compute liquid line size are as follows:
1. Compute the actual length of field installed piping.
2. Multiply the length from step # 1 by 1.5 to estimate the equivalent length.
3. Refer to Table 11 to determine the outside diameter that corresponds to the
equivalent length computed in step # 2 for the height and leaving water tempera-
ture of interest.
Note: If the condenser is at the same elevation or above the evap, use the 0 ft.
column.
4. With the outside diameter found in step # 3, use Table 12 to determine the equiv-
alent lengths of each fitting in the field installed piping.
5. Sum the equivalent lengths of all the field installed elbows and valves.
6. Add the length found in step # 5 to the actual length from step # 1. This is your
new equivalent line length.
7. U s i n g Table 11 again, find the outside diameter that corresponds to the new
equivalent line length from step # 6. If it is the same as step #3, this is the final
equivalent length. Otherwise, proceed to the next step.
8. Using Table 12 and the new outside diameter found in step # 7, find the equivalent
line length of each valve and fitting, and sum them.
9. Add the length found in step # 8 to the actual length from step # 1. This is the new
equivalent line length.
10. With the equivalent line length found in step # 9, use Table 11 to select the proper
outside diameter for the liquid lines. If the same as in step #7, this is your final
equivalent line length. Otherwise, repeat step #7.
Table 12 Equivalent Lengths of Non-Ferrous Valves and Fittings (feet)
Line Size Inches
OD
Globe Valve Short Angle
Valve
Short Radius
ELL
Long Radius
ELL
1-1/887292.71.9
1-3/8 102 33 3.2 2.2
1-5/8 115 34 3.8 2.6
2-1/8 141 39 5.2 3.4
2-5/8 159 44 6.5 4.2
3-1/8 185 53 8 5.1
3-5/8 216 66 10 6.3
4-1/8 248 76 12 7.3