Brazing Procedure; Screens - Emerson Copeland Stream Digital 4MFD-13X Application Manuallines


High-pressure side (HP):

Low-pressure side (LP):
NOTE: The compressor operating range may be restricted for various reasons. Check the
application range limitations in
www.emersonclimate.eu.
3.3

Brazing procedure

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.
Refer to Figure 11 and procedure below for the brazing of the suction and discharge lines:
Figure 11: Suction tube brazing areas

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.
3.4

Screens

CAUTION
Screen blocking! Compressor breakdown! Use screens with at least
0.6 mm openings.
The use of screens finer than 30 x 30 mesh (0.6 mm 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 normal system debris and block the flow of either oil or refrigerant to
the compressor. Such blockage can result in compressor failure.
12
28.0 bar(g) (up to S/N 14K46143M)
32.5 bar(g) (from S/N 14K46144M onwards)
22.5 bar
Copeland brand products

The copper-coated steel tubes on Stream Digital
compressors can be brazed in approximately the same
manner as any copper tube.

Recommended brazing materials:
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.
Select software at
any Silfos
C6.3.2/0416-0716/E