Figure 4
Scroll Suction Tube Brazing
New Installations
• The copper-coated steel suction tube on scroll compressors can be brazed in approximately the same manner
as any copper tube.
• Recommended brazing materials: Any silfos material is recommended, preferably with a minimum of 5% silver.
However, 0% silver is acceptable.
• Be sure suction tube fitting I.D. and suction tube O.D. are clean prior to assembly. If oil film is present wipe with
denatured alcohol, Dichloro-Trifluoroethane or other suitable solvent.
• Using a double-tipped torch apply heat in Area 1. As tube approaches brazing temperature, move torch flame to
Area 2.
• Heat Area 2 until braze temperature is attained, moving torch up and down and rotating around tube as
necessary to heat tube evenly. Add braze material to the joint while moving torch around joint to flow braze
material around circumference.
• After braze material flows around joint, move torch to heat Area 3. This will draw the braze material down into
the joint. The time spent heating Area 3 should be minimal.
• As with any brazed joint, overheating may be detrimental to the final result.
Field Service
Remove refrigerant charge from both the low and high side of the compressor before cutting the suction
and discharge lines to remove the compressor. Verify the charge has been completely removed with
manifold gauges.
• To disconnect: Reclaim refrigerant from both the high and low side of the system. Cut tubing near compressor.
• To reconnect:
Recommended brazing materials: Silfos with minimum 5% silver or silver braze material with flux.
Insert tubing stubs into fitting and connect to the system with tubing connectors.
Follow New Installation brazing
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