10 18-AC115D1-1B-EN
STEP 3 - Purge the refrigerant lines and indoor
coil with dry nitrogen.
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 evapora-
tor 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 Precautions should be taken to avoid
heat damage to basepan during brazing. It is heat damage to basepan during brazing. It is
recommended to keep the flame directly off of the recommended to keep the flame directly off of the
basepan.basepan.
STEP 5 - Replace the pressure tap valve cores
after the service valves have cooled.
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