Trane Rtaaiom3 Manual

51RTAA-IOM-3
Table 4
Liquid Line Size for Horizontal and/or Downflow Lines
Circuit Size: Liquid Line Size (OD”)Total Equiv. Length (Ft) 100 Ton 85 Ton 70 Ton25 1 1/8 1 1/8 1 1/8
50 1 3/8 1 1/8 1 1/8
75 1 3/8 1 3/8 1 3/8
100 1 3/8 1 3/8 1 3/8
125 1 3/8 1 3/8 1 3/8
150 1 5/8 1 3/8 1 3/8
175 1 5/8 1 5/8 1 5/8
200 1 5/8 1 5/8 1 5/8
225 1 5/8 1 5/8 1 5/8
250 1 5/8 1 5/8 1 5/8
275 1 5/8 1 5/8 1 5/8
300: 1 5/8 1 5/8 1 5/8
Table 5
Equivalent Lengths of Non-Ferrous valves and Fittings
Line Size Globe Angle Short...

52
RTAA-IOM-3
Figure 31 
Remote Evaporator Piping Example 

53RTAA-IOM-3
Suction Line Sizing
This example uses the unit installation
shown in Figure 31 and assumes a 100
ton circuit. As in the liquid line sizing
example, the equivalent pipe length
must first be determined. It must also
be determined what portion of the pipe
is “horizontal and/or downflowing”
and what portion is “horizontal and/or
upflowing.”
In Figure 31, the actual length of field
installed piping is 100 feet (20 + 5 + 75).
Using the factor of 1.5, the equivalent
line length is 150 feet. The...

54RTAA-IOM-3
Piping Installation
Procedures
The outdoor unit and the evaporator
are shipped with a 25 psig holding
pressure of dry nitrogen. Do not relieve
this pressure until field installation of
the refrigerant piping is to be
accomplished. This will require the
removal of the temporary pipe caps.
Note: Use Type L refrigerant-grade
copper tubing only.
The refrigerant lines must be isolated
to prevent line vibration from being
transferred to the building. Do not
secure the lines rigidly to the...

55RTAA-IOM-3
Figure 32
Customer Interconnect Wiring for
RTAA Outdoor unit with Remote Evaporator –
130 to 200 Tons
2306-9133A 

56RTAA-IOM-3
Leak Test and Evacuation
After installation of the refrigerant
piping, thoroughly test the system for
leaks. Pressure test the system at
pressures required by local codes.
Immediately before evacuation, install
the liquid line filter cores. These will be
shipped with the evaporator.
Note: Do not install these before the
circuit is ready for evacuation, as the
cores will absorb moisture from the
atmosphere.
For field evacuation, use a rotary-type
vacuum pump capable of pulling a
vacuum of 100...

57RTAA-IOM-3
Installation –
Electrical
Figure 33
Warning Label
General
Recommendations
WARNING: The Warning Label
shown in Figure 33 is displayed
on the equipment and shown on
wiring diagrams and schematics.
Strict adherence to these
warnings must be observed.
All wiring must comply with local
codes and the National Electric Code.
Typical field wiring diagrams are
shown in Figures 34 thru 36. Minimum
circuit ampacities and other unit
electrical data are on the unit
nameplate and are shown in Table 10....

58RTAA-IOM-3
(Continued on Next Page)Figure 34
Typical Field Wiring for
RTAA Packaged Unit –
130 to 200 Tons 

59RTAA-IOM-3
(Continued from Previous Page)
See Notes on Next Page 

60RTAA-IOM-3
Figure 34 (Continued from Last Page)
Typical Field Wiring for
RTAA Packaged Unit –
130 to 200 Tons
2306-9123-A