Emerson Copeland EazyCool OME-4MTL-09X, Application Manuallines

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C6.1.11/0718-0619/E 37
3.2.2 Brazing recommendations
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.
1 ) Remove the liquid connection cap.
2 ) Remove the suction connection cap.
Figure 52
3 ) Open the liquid line valve mid-way. Care should be taken to avoid the holding charge releasing
too quickly.
4 ) Be sure tube fitting inner surface and tube outer surface are clean prior to assembly.
5 ) Both tubes are extended from the condensing unit housing, therefore Emerson recommends
isolating the housing by using a wet cloth on the copper tubing.
6 ) Use a double-tipped torch.
Recommended brazing materials: see Table 21 below and recommendations specific to K65 at:
http://www.wieland-
thermalsolutions.com/commonmedia/content/media/en/prospekte_2/gbrohre/prospekte/untersuchu
ngsergebnisse_wieland_k65_11.pdf
Brazing alloy
DIN EN
ISO 17672
DVGW* number
Working
temperature
[°C]
Composition [% by weight]
Ag Cu Zn Sn P
BrazeTec
4576
Ag145 DV-0150CM0043 670 45 27 25.5 2.5 -
BrazeTec
3476
Ag134 DV-0150CM0045 710 34 36 27.5 2.5 -
BrazeTec
4404
Ag244 DV-0150CM0044 730 44 30 26 - -
BrazeTec S
15
CuP284 - 700 15 80 - - 5
BrazeTec S 5 CuP281 - 710 5 89 - - 6
BrazeTec S 2 CuP279 DV-0105CL0475 740 2 91.7 - - 6.3
Flux
DIN EN
1045
DVGW* number
Active
temperature
[°C]
Comments
BrazeTec h FH10 DV-0101AU2227 550-970
Flux residues are corrosive and must be
removed
* DVGW = German Technical and Scientific Association for Gas and Water
Table 21: Extract of the recommendations for acceptable brazing alloys and flux
Suction line
Liquid line