Trane RAUC-IOM-15, Installation & Maintenance Instructions Manual, Page: 25 / 68

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3. Using the gauge bracket as a template for the self tap-
ping screws, mount the gauge bracket approximately 1/
2" to 3/4" from the outer edge of the base rail, relative to
the compressors for that circuit, as illustrated.
4. Apply 6" strips of edge protector to both side flanges of
the gauge bracket, to prevent the bracket from cutting
into the power wires.
2. Remove the valve stem cap and place the valve depres-
sor (with tubing connected) onto the valve stem and
tighten.
Note: Do not install the valve depressor without the
tubing being connected. If gauges need to be
replaced, remove valve depressor from valve stem,
first, to prevent loss of refrigerant charge.
Final Refrigerant Pipe Connections
To access the refrigerant pipe connections, remove the lou-
vered side grills. Refer to Figure 3-2.
These condensing units are shipped with a Nitrogen hold-
ing charge. Install pressure gauges to the appropriate ac-
cess valve(s) and take a reading. If no pressure is present,
refer to the “Leak Testing Procedure” section. If pressure is
present, relieve the pressure before attempting to unsweat
the “seal” caps. If refrigerant connections are not capped,
but are “spun-end” tubes, use a tubing cutter to remove the
end from the pipe.
Note: To prevent damage to the system, do not drill
a hole in the seal caps or saw the ends off pipe
stubs. This may introduce copper chips into the
system piping.
Brazing Procedures
Proper brazing techniques are essential when installing re-
frigerant piping. The following factors should be kept in
mind when forming sweat connections.
1. When copper is heated in the presence of air, Copper ox-
ide forms. To prevent copper oxide from forming inside
Installation (Continued)