EXTRE COOLING XC-14A Service Manual page 50

XC-14A, XC-22A, XC-30A SERVICE MANUAL
REFRIGERANT SYSTEM REPAIR
Brazing
• In the event of a leak, obstruction, or trouble in the refrigerant system of the
unit, replace or repair the defective component. After replacing defective
component, braze all connections.
1) Proper brazing techniques
• When brazing, use a slightly reduced flame. Oxyacetylene is commonly used
since the flame condition can be easily judged and adjusted. Unlike gas welding,
a secondary flame is used for brazing. Properly preheat the base metal according
to the shape, size and thermal conductivity of the brazed fitting.
• The most important point in flame brazing is to bring the entire brazed fitting to
a proper brazing temperature. Care should be taken not to cause overflow of the
brazing filler metal, oxidation of the brazing filler metal, or filler metal
deterioration due to overheating the flux.
2) Brazed fittings and fitting clearance
• In general, the strength of the brazing filler
metal is lower than that of the base metal.
As such, the shape and clearance of brazed
fittings are very important. Concerning the
shape of brazed fittings, adhesive area
must be maximized. In addition, the
clearance of the brazed fitting must be
minimized so that the brazing filler metal
will flow into the fitting via capillary action.
Page 50
Clearance From The Pipe Fitting and Tubing.
Xtreme Power Conversion® (XPC) Corporation
Portable Air Conditioners
Clearance
0.001~0.003 in
(0.025~0.075 mm)
a