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AGL_Unit_LOCU_EN_Rev00
3.2.3 Brazing recommendations
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.
CAUTION
High temperature!
Risk of component damage!
Always use a wet cloth
when brazing the suction tube. Pay special attention to the pressure
transmitter on the suction pipe: it needs to be cooled down during brazing to
avoid any damage to the component.
CAUTION
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 f ormation of copper oxides in the system. If allowed
to f orm, 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 f itting inner surface and tube outer surface are clean prior to assembly.
▪
Both tubes are extended f rom the ref rigeration unit housing, therefore Emerson recommends
isolating 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 f erric metals a silver alloy
rod either f lux coated or with a separate flux would be used.
▪
Use a double-tipped torch.
Figure 30: Brazing
– Sectional view
Summary of Contents for Copeland OLE-49
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