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9.588 ± 0.738 ft. lb (13 ± 1 Nm). It is critically important
that the grommet is not compressed.
See Figure 4 for reference.
Figure 4 Soft mounting parts for single
compressors ZB07KAU to ZB11KAU
Note: 3 pieces for compressor are required.
3.5. Brazing procedure
Figure 5 - Suction tube connecting areas
WARNING
High temperature! Burning! Proceed with caution
when brazing system components. Do not touch the
compressor until it has cooled down. Ensure that other
materials in the area of the compressor do not make
contact
CAUTION
Blockage! Compressor breakdown! Maintain a flow
of oxygen-free nitrogen through the system at very low
pressure during brazing (1.5 to 2 PSI). 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 orifices.
CAUTION
Contamination or moisture! Bearing failure! Do not
remove the connection plugs until the compressor is set
into the unit. This minimizes any entry of contaminants
and moisture
© 2018 Emerson Climate Technologies, Inc.
Refer to Figure 5 and procedure below for the brazing
of the suction and discharge lines to a Scroll
compressor.
The copper-coated steel tubes on Scroll compressors
can be brazed in approximately the same manner as
any copper tube.
•
Recommended brazing material: Any SIL-FOS®
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.
NOTE: Since the discharge stub contains a check
valve, care must be taken not to overheat it to
prevent brazing material from flowing into it.
3.6. Filter screens
CAUTION
Screen blocking! Compressor breakdown! Use filter
screens with at least 0.024" openings.
The use of filter screens finer than 30 x 30 mesh (0.024"
openings) anywhere in the system should be avoided
with these compressors. Field experience has shown
that finer mesh screens used to protect thermal
expansion valves, capillary tubes or accumulators can
become temporarily or permanently plugged with
10
AE4-1431 R1
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