Trane 4TTM3018 Installer's Manual page 9

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.
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.
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 il-
lustrated. 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.
18-AC78D1-6
3-4" from valve
9