Refrigerant Line Brazing; Braze The Refrigerant Lines - ComfortStar 18 Installation 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 7-1
2. Remove the pressure tap cap from both service valves.
Figure 7-2
3. Purge the refrigerant lines and indoor coil with dry
nitrogen.
This pipe
must have
a thimble
Figure 7-3
4. Wrap a wet rag around the valve body to avoid heat
damage and continue the dry nitrogen purge (Fig.
7-4).
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 7-4
5. Replace the pressure tap caps after the service
valves have cooled.
Do not over tighten (between 40 and 60 inch-lbs.
maximum).
Figure 7-5
07
NOTE
Field supplied
and installed
3-4" from valve
NOTE