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© 2015 Emerson Climate Technologies, Inc.
AE4-1387 R7
Figure A
Scott-Tee Three Phase
A PHASE
B PHASE
A
M1
T1
M2
B
A2
A1
C PHASE
C
New Installation
• The copper-coated steel suction, discharge, and
injection tubes on scroll compressors can be
brazed in approximately the same manner as
any copper tube.
• Recommended brazing material – Any Silfos
material is recommended, preferably with a
minimum of 5% silver. However, 0% silver is
acceptable.
• Use of a dry nitrogen purge to eliminate
possibility of carbon buildup on internal tube
surfaces is recommended.
•
Be sure process tube fitting I.D. and process
tube O.D. are clean prior to assembly.
• Apply heat in Area 1. As tube approaches
brazing temperature, move torch flame to Area
2. (See
Scroll Tube Brazing
figure below.)
• 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 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
To disconnect:
• Recover 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.
•
Reinsert tubing fitting.
• Heat tube uniformly in Area 1, moving slowly to
Area 2. When joint reaches brazing temperature,
apply brazing material. (See figure below)
• Heat joint uniformly around the circumference to
flow braze material completely around the joint.
• Slowly move torch in Area 3 to draw braze
material into the joint.
Do not overheat joint.
Scroll Tube Brazing
