Brazing Recommendations; Figure 20: Brazing - Sectional View - Emerson Copeland EazyCool ZX Series Application Manuallines

3.2.2 Brazing recommendations

WARNING
Air/flammable refrigerant mixture! Creation of a potentially flammable
atmosphere! Fire hazard! Remove all refrigerant before opening the system.
When working on a refrigerant-filled system, make sure to follow the safety
and working instructions given in Chapter 5 "Maintenance & repair".
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 come into contact
with it.
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.
▪ Remove the discharge connection cap.
▪ Remove the suction connection cap.
▪ Open both valves mid-way. Care should be taken to avoid the holding charge releasing too
quickly.
▪ Be sure tube fitting inner surface and tube outer surface are clean prior to assembly.
▪ Both tubes are extended from the condensing unit housing, therefore we recommend to isolate
the housing by using a wet cloth on the copper tubing.
▪ Recommended brazing materials: a copper/phosphorous or copper/phosphorous/silver alloy rod
should be used for joining copper to copper whereas to join dissimilar or ferric metals a silver alloy
rod either flux coated or with a separate flux would be used.
▪ Use a double-tipped torch.
Figure 20: Brazing – Sectional view
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