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56 RTAC-SVX01F-EN
Installation - Mechanical
Remote Evaporator Option
For this example, refer to Table 11, Table 12 and Figure 28. Assume a 70 ton circuit
and a leaving water temperature of 49 degrees F.
1. Fro m Figure 28, the actual length of field installed piping is:
80 + 8 + 8 + 21 = 117 feet
2. Estimate equivalent line length:
117 feet x 1.5 = 175 feet
3. From Table 11 for a 70 ton circuit, for 175 equivalent feet the OD is 1.375 inches.
Note: use the 0 ft. column since the condenser is above the evap
4. In Figure 28 there are six long-radius elbows. From Table 12, for 1.375 inch
elbows, the equivalent feet is:
6 elbows x 2.2 feet = 13.2 feet
5. Adding equivalent feet from step #4 to step #1 gives:
13.2 feet + 117 feet = 130.2 feet
6. From Table 11, for a 70 ton circuit, for 125 equivalent feet (nearest to 130.2), the
O.D. is 1- 3/8 inches.
Liquid Line size = 1-3/8 inches
Suction Line Sizing Steps
The steps to compute suction line size are as follows:
1. Break the suction line into it's Vertical/Upflow and Horizontal/Downflow compo-
nents.
2. From Table 14, select the appropriate Vertical/Upflow suction line outside diame-
ter according to the circuit tonnage. This is the diameter of the upflow suction line
and any fittings in the upflow line.
3. From Table 14, select the appropriate Horizontal/Downflow suction line outside
diameter according to the circuit tonnage. This is the diameter of the upflow suc-
tion line and any fittings in the upflow line.
NOTE: The diameters of the upflow, and horizontal or downflow portions of the
suction line may differ depending on the application.
Example Suction Line Sizing
For this example, refer to Table 14 and Figure 28 assume a 70 ton circuit and a leaving
water temperature of 49 degrees F.
1. Fro m Table 14, the vertical/upflow suction line is: 3 5/8” O.D.
2. From Table 14, the horizontal/downflow line is: 3 5/8” O.D.
NOTE: In this example, the horizontal line is pitched downward in the direction of
flow.
Table 14 Suction Line Sizes
Vertical/Upflow and Horizontal/Downflow Suction Lines O.D. (Type L Copper)
LWT (F) 70 ton circuit 85ton circuit 100 ton circuit 120 ton circuit
40 - 60 3 5/8” 3 5/8” 4 1/8” 4 1/8”