18-BC117D1-1B-EN 7
Isolation Through Wall
DO NOT hang line sets from ductwork
Sealant
Insulation
Vapor Line
Wall
Ductwork
Isolator
Line Set
STEP 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.
STEP 2 - Remove the pressure tap cap and valve cores from both service valves.
STEP 3 - Purge the refrigerant lines and indoor coil with dry nitrogen.
Purge the refrigerant lines and indoor coil with dry nitrogen.
Note: A2L equipment shall have red marked service ports and pipes through which refrigerant is serviced.
STEP 4 - Wrap a wet rag around the valve body to avoid heat damage and continue the dry nitrogen purge.
Braze the refrigerant lines to the service valves.
For units shipped with a field-installed external drier, 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. Braze the
filter drier to the Liquid Line.
Continue the dry nitrogen purge. Do not remove the wet rag until all brazing is completed.
Important: Remove the wet rag before stopping the dry nitrogen purge.
Note: Install drier in Liquid Line.
NOTE:NOTE: Precautions should be taken to avoid heat damage to basepan during brazing. It is recommended to Precautions should be taken to avoid heat damage to basepan during brazing. It is recommended to
keep the flame directly off of the basepkeep the flame directly off of the basepan.an.
STEP 5 - Replace the pressure tap valve cores and plastic tabs after the service valves have cooled.
Section 7. Refrigerant Line Brazing
7.1 Braze The Refrigerant Lines
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