Brazing Procedure - Emerson Copeland Scroll ZR24KRE Application Manuallines

grommet in place. It is not designed as a load-bearing member, and application of excessive
torque to the bolts can crush the sleeve. Its inner diameter is approximately 8.5 mm to fit, eg, an
M8 screw. The mounting torque should be 13 ± 1 Nm. It is critically important for the grommet not
to be compressed.
If the compressors are mounted in tandem or used in parallel, then the hard mountings (bolt M9
5/16") are recommended. The mounting torque should be 27 ± 1 Nm. It is possible to deliver these
hard mounting parts as a kit. See Emerson spare parts software for reference.
Mounting parts: ZR24K* to ZR92K* - Soft mountings
Figure 5: Mounting parts

Brazing procedure

3.2
IMPORTANT
Blockage! Compressor breakdown! Maintain a flow of oxygen-free nitrogen
through the system at very low pressure during brazing. Nitrogen displaces
the air and prevents the formation of copper oxides in the system. If allowed
to form, the copper oxide material can later be swept through the system and
block screens such as those protecting capillary tubes, thermal expansion
valves, and accumulator oil return holes.
Contamination or moisture! Bearing failure! Do not remove the plugs until
the compressor is set into the unit. This minimises any entry of contaminants
and moisture.
Figure 6: Suction tube brazing areas
▪
The copper-coated steel tubes 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 tube fitting inner diameter and tube outer diameter are clean prior to assembly.
▪
Using a double-tipped torch, apply heat in area 1.
▪
As the tube approaches brazing temperature, move the torch flame to area 2.
▪
Heat area 2 until braze temperature is attained, moving the torch up and down and rotating
around the tube as necessary to heat the tube evenly. Add braze material to the joint while
moving the torch around the joint to flow braze material around the circumference.
▪
After the braze material flows around the joint, move the 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.
To disconnect:
▪
Heat joint areas 2 and 3 slowly and uniformly until the braze material softens and the tube can
be pulled out of the fitting.
To reconnect:
▪
Recommended brazing materials: Silfos with minimum 5% silver or silver braze used on other
compressors. Due to the different thermal properties of steel and copper, brazing procedures
may have to be changed from those commonly used.
C6.2.41/0219/E
Copeland Scroll compressors have copper-plated steel
suction and discharge tubes. These tubes are far more
robust and less prone to leaks than copper tubes. Due to
the different thermal properties of steel and copper,
brazing procedures may have to be changed from those
commonly used.
Refer to Figure 6 and the procedure below for the
brazing of the suction and discharge lines to a scroll
compressor.
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