RTAA-SVX01A-EN 37
Installation — Remote Evaporator
.
7. Figure 17 depicts an installation where the remote evaporator elevation is
the same as that of the outdoor condensing unit. The suction and liquid
line are horizontal or down flowing only.
8. Figure 18 shows a variation to Figure 17. The remote evaporator and out-
door condensing unit are at the same elevation but interconnecting piping
may be installed up to 15 feet above the base elevation. In this case a
suction line trap is required to assure oil return, and the suction accumu-
lator line must be extended at least by the amount determined from Table
7.
9. For installations where the remote evaporator is at a lower elevation than
the outdoor condensing unit as shown in Table 4, the elevation difference
is not to exceed 100 feet. An inverted liquid line trap to prevent unwanted
free cooling modes and a suction line trap to assure oil return from the
evaporator must be included on both circuits as shown. The apex of the
liquid line trap should be at a height above the condenser coils. The high-
est point of the suction line piping must not exceed 4 inches above the
outdoor condensing unit suction line connection point.
10. When the elevation of the remote evaporator exceeds that of the outdoor
condensing unit as shown in Figure 20, the elevation difference may not
exceed 15 feet. The suction accumulator line must be extended at least
by the amount determined from Table 7. This line must not exceed 4
inches above the outdoor unit suction line connection point. An inverted
suction line trap whose apex is 3 to 15 feet above the elevation of the
remote evaporator is required in both circuits.
11. Compressor and oil separator heaters must be on at least 24 hours prior
to compressor start.
Table 6 Suction Line Sizes (“O.D.”) for
Horizontal and/or Downflow Lines
Circuit Size:
Total Equiv.
Length (ft.) 35 Ton 40 Ton 50 Ton 60 Ton
25 2.125 2.125 2.625 2.625
50 2.125 2.125 2.625 2.625
75 2.125 2.125 2.625 2.625
100 2.125 2.625 2.625 2.625
125 2.125 2.625 2.625 2.625
150 2.625 2.625 2.625 2.625
175 2.625 2.625 2.625 3.125
200 2.625 2.625 2.625 3.125
225 2.625 2.625 2.625 3.125
250 2.625 2.625 2.625 3.125
275 2.625 2.625 3.125 3.125
300 2.625 2.625 3.125 3.125
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