Refrigerant Line Brazing - Trane OXBOX J4AC4 Series Installation Instructions Manual

7. Refrigerant line brazing

7.1 Braze the refrigerant lines
1. Remove caps or plugs. Use a deburing tool to debur the pipe ends.
Clean both internal and external surfaces of the tubing using an emery
cloth.
Figure 16
2. Remove the pressure tap cap from both service valves.
Figure 17
3. Purge the refrigerant lines and indoor coil with dry nitrogen.
This pipe
must have
a thimble
Figure 18
4. Wrap a wet rag around the valve body to avoid heat damage and
continue the dry nitrogen purge (Figure 19).
Braze the refrigerant lines to the service valves.
Check liquid line filter drier's directional flow arrow to confirm correct
direction of refrigeration flow (away from outdoor unit and toward
evaporator coil) as illustrated. Brazing the filter drier to the Liquid
Line.
Continue the dry nitrogen purge. Do not remove the wet rag until all
brazing is completed.
Remove the wet rag before stopping the dry nitrogen purge.
Figure 19
5. Replace the pressure tap caps after the service valves have cooled.
Note: Do not over tighen (between 40 and 60 inch-lbs. maximum).
Figure 20
7
Field supplied
and installed
3-4" from valve