PURGING THE SYSTEM

TM5-4110-234-14

TO 40R7-5-7-1

NOTE

Operation of the recovery/recycling unit must be by AUTHORIZED PERSONNEL ONLY.

(6)

Connect and operate a recovery/recycling unit in accordance with the manufacturer's instructions.

(7)

If the system is to be repaired, go to paragraph 5-9. If the system is to be charged, go to paragraph 5-

10.

5.9.

PURGING THE SYSTEM

The refrigeration system must be purged with dry nitrogen before any brazing is performed on any component. A flow of

dry nitrogen at the rate of 1-2 cfm (0.028-0.057 m3/minute) should be continued during all brazing operations to minimize

internal oxidation and scaling.

Nitrogen is an inert gas; however, it also presents danger as a suffocant and, therefore, must also be

discharged in a ventilated location.

See specific item maintenance instructions for hook up procedures.

5-10.

EVACUATING THE SYSTEM See figure 5-3.

Figure 5-3. Evacuating the System

The refrigeration system or portion of system that was opened must be evacuated to remove all moisture before it

is charged with Refrigerant-1i 2.

Check that system was leak tested and has NO LEAKS.

Check that new filter-drier was installed. If not, install one.

Check that both compressor service valves are backseated and manifold valves are closed.

Attach hose assemblies to service valves and manifold valves.

Attach hose assembly to vacuum pump and manifold center connection.

Change 2 5-8