Trane RAUJ-C20, Installation, Operation And Maintenance Manual

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54 SS-SVX11K-EN
strength of the connection will be significantly
reduced. The overlap distance should be equal to
the diameter of the inner tube.
• Wrap the body of each refrigerant line component
with a wet cloth to keep it cool during brazing.
Move any tube entrance grommets away for the
brazing area.
N No otte e:: Use 40 to 45% silver brazing alloy (BAg-7 or
BAg-28) on dissimilar metals. Use BCup-6
brazing alloy on copper to copper joints.
• If flux is used, apply it sparingly to the joint.
Excessive flux can enter the system which will
contaminate the refrigerant system.
• Apply heat evenly over the length and
circumference of the joint to draw the brazing
material into the joint by capillary action. Remove
the brazing rod and flame from the joint as soon as
a complete fillet is formed to avoid possible
restriction in the line.
• Visually inspect the connection after brazing to
locate any pin holes or crevices in the joint. The use
of a mirror may be required, depending on the joint
location.
Leak Testing Procedure
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When leak testing a refrigerant system, observe all
safety precautions.
Trane condensing units are shipped with a nitrogen
holding charge. If there is no pressure, the unit must be
leak tested to determine the location of leak.
N No otte e:: These service procedures require working with
refrigerant, Do NOT release refrigerant to the
atmosphere! The service technician must
comply with all federal, state, and local laws.
Use refrigerant gas as a tracer for leak detection and
use oil-pumped dry nitrogen to develop the required
test pressure. Test the high and low side of the system
at pressures dictated by local codes.
1. Close the field supplied liquid line service valve(s)
installed near the evaporator and the compressor
discharge service valve to isolate the system's high
side from the low side. Pressure test the liquid line,
discharge line, and condenser coils at pressures
dictated by local codes. Do not exceed 10# above
the pressure control settings.
2. Connect a refrigerant cylinder to the charging port
of the liquid line service valve. Use the refrigerant
to raise the high side pressure to 12 to 15 psig.
3. Disconnect the refrigerant cylinder. Connect a dry
nitrogen cylinder to the charging port and increase
the high side pressure. Do not exceed the
condenser maximum working pressure listed on
the unit nameplate.
4. Use a leak detector or soap bubbles to check for
leaks. Check all piping joints, valves, etc.
5. If a leak is located, use proper procedures to
remove the refrigerant/nitrogen mixture, break the
connection and remake as a new joint. Retest for
leaks after making repairs.
6. Repeat the test procedure for the low side of the
system, charging through the suction pressure
gauge port or through an access provided on the
suction line by the installer. Increase the system
pressure to 100 psig.
7. If a leak is located, use proper procedures to
remove the refrigerant/nitrogen mixture, break the
connection and remake as a new joint. Retest for
leaks after making repairs.
8. Open the liquid line service valve and the
compressor discharge service valve.
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