REFRIGERATION SYSTEM SERVICING (PURGING)

TM 9-4120-425-14&P

REFRIGERATION SYSTEM SERVICING (PURGING)

0050-00

THIS WORK PACKAGE COVERS:

Service (Purging)

INITIAL SETUP:

Maintenance Level

Direct Support

Tools and Special Tools

Tool Kit, General Mechanics (Item 1, Table 2, WP 0118-00)

Tool Kit, Service, Refrigeration Unit (Item 2, Table 2, WP 0118-00)

Nitrogen Pressure Regulator (Item 4, Table 2, WP 0118-00)

Mask, Air Filtering (Item 29, Table 1, WP 0121-00)

Materials/Parts

Nitrogen (Item 4, WP 0121-00)

References

WP 0118-00 (MAC)

Equipment Condition

Refrigerant system discharged (WP 0049-00).

Main power source disconnected.

WARNING

Disconnect air conditioner power supply.

WARNING

Be sure that the manifold hoses are correctly connected. BLUE Hose = Low

Pressure, RED Hose = High Pressure.

WARNING

The refrigeration system must be purged with dry nitrogen, during any brazing

operation performed on any component. A flow of dry nitrogen at the rate of less

than 1 - 2 cfm (0.028-0.057 m3/minute) should be continued during all brazing

operations to minimize internal oxidation and scaling.

CAUTION

Nitrogen cylinders are pressurized containers. The pressure in the cylinder can

exceed 2000 PSI. A nitrogen pressure regulator must be used at all times when

nitrogen is used for leak check or purge operations.

0050-00-1