10
AF-05CML
INNER CONE
TORCH STEM
SILVER ALLOY
Figure 3
Directing Torch Flame to Copper Tubing.
3/8"
PROPER FLUXING
Flux is necessary when using silver solder; it is not required when using silfos
on copper to copper joints.
To do a good job the flux should cover the tube surface completely. Be careful
not to introduce any flux inside the tubing.
Fluxingshouldbedoneafterthetubingismatedtogetherandjustbeforebrazing
is done.
Do not allow it to dry out.
When brazing, the flux should become entirely liquid and clear, like water. The
temperature will be at 1100˚F and only a little more heat will allow the alloy to
flow freely into the joint.3
EMERY CLOTH
KEEP TUBE IN
DOWNWARD POSITION
Cleaning Tubing.
Figure 1
HOWTO REPAIR REFRIGERATION
Before sealed system work can be preformed a refrigerant recovery EPA and LOCALLY approved certification is
required, additionally, EPA and LOCALLY approved refrigerant recovery equipment is required.
SEALED SYSTEM REPAIR
Sealed system repairs should be properly diagnosed before entering into a repair of the system.
It is important to follow proper procedures when doing a system repair for safety reasons and that the repair will result in a
restoration of the system to proper factory standards.
SAFETY REMINDERS
1) Do not heat any system component with an open flame for any reason.
2) Do not solder until you are sure that all refrigerant has been removed from the system.
3) Donotheatthechargingcylinderwithanopenflame.Usewarmwater only and do not exceed 125˚F(nottoohottokeep
your hand in.)
4) Do not over fill any charging cylinders, as they could explode when over filled.
5) Use proper wrenches.
6) Use safety goggles when working with refrigerants.
7) Keep a fire extinguisher within easy reach.
8) Watch flame direction when soldering so as not to burn clothing, wiring or other components.
9) Solderinawellventilatedarea.Ifahighconcentrationoffreonispresent,anopenflamewill createphosgene gaswhich
can be harmful.
PROPER SOLDERING
Jointclearancesshouldbemaintainedsothatthebrazingalloywillflowbetween
the closely mated surfaces rather than forming large fillets.
Thisfilmsmakethestrongestjoints,capillaryattractionalsoworkbestwithclose
tolerance.
The best clearance is between 0.01" to 0.03", the amount of lap will be
approximately 3/8" depending on the sweging tool used. (Figure 1.)
To make a sound, leak tight joint, the brazing alloy when raised to brazing
temperature,mustwetandflowfreelyovertheentiresurfaceofthetubinginthe
joint area.
Toassurethis,thetubingsurfacesmustbefreeofalldirt,grease,oilandoxides
otherwise the alloy will not wet and flow properly over any surface with these
elements present. Cleaning can be done with an abrasive cloth or steel wool.
Never blow into the tubing because this will introduce a lot of moisture into the
system.Opentubingjointsshouldbecoveredifexposedforlongperiodsoftime.
Figure 2
GOOD FIT POOR FIT
Joint Clearance.
PROPER
JOINT FIT
CLEARANCE
.001"TO .003"
CLEANING TUBING
