Section 7. Refrigerant Line Brazing; Section 8. Refrigerant Line Leak Check - Trane 4TTR3 Installation And Operation Manual

Section 7. Refrigerant Line Brazing

7.1 Braze The Refrigerant Lines
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.
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.
N N OTE: OTE: Precautions should be taken to avoid heat damage to basepan during brazing. It is recommended to keep
Precautions should be taken to avoid heat damage to basepan during brazing. It is recommended to keep
the flame directly off of the basepan. the flame directly off of the basepan.
STEP 5 - Replace the pressure tap valve cores after the service valves have cooled.
STEP 1
3-4" from valve
STEP 4

Section 8. Refrigerant Line Leak Check

8.1 Check For Leaks
STEP 1 - Pressurize the refrigerant lines and evaporator coil to 150 PSIG using dry nitrogen.
STEP 2 - Check for leaks by using a soapy solution or bubbles at each brazed location. Remove nitrogren pressure
and repair any leaks before continuing.
18-AC79D1-10E-EN
STEP 2
STEP 5
STEP 3
7