LEAK TESTING (Cont)

TM 9-4120-428-14

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8) If no leaks were found, check the unit charge (WP 0071 00) and (WP 0074 00).

B. To pressurize a system that has been discharged and purged:

1) Connect the 1/4 inch yellow hose (charge) to a cylinder of refrigerant R-22 set to deliver gas only.

2) Open the service manifold compound gauge, pressure gauge, and charge valves.

3) Check that the service manifold vacuum valve is closed.

4) Open the refrigerant cylinder valve and pressurize the system to 40-50 psi (2.8 -3.5 kg/cm2).

5) Close the service manifold valves and the refrigerant cylinder valve.

6) Disconnect the 1/4 inch yellow hose (charge) from the refrigerant cylinder..

7) Connect the 1/4 inch yellow hose (charge) to a nitrogen regulator and dry nitrogen cylinder.

8) Open the service manifold compound gauge, pressure gauge, and charge valves.

9) Open the nitrogen cylinder valve and pressurize the system to 350 psi (24.7 kg/cm2).

10) Close the service manifold valves and nitrogen cylinder valve.

11) Test for leaks at all points of possible leaks by using an electronic refrigerant gas leak detector or by

brushing on a soap solution while closely observing for bubbles to form.

12) If a leak is detected, discharge and purge the system and repair the leak. Retest for leaks (WP 0000 00).

13) If a soap solution was used to test for leaks, thoroughly rinse test areas with fresh water.

14) After performing the leak tests, discharge and purge the system before performing maintenance or

evacuating and charging the system, as appropriate (WP 0065 00) and (WP 0066 00).

NOTE

FOLLOW-ON MAINTENANCE:

Remove service manifold (WP 0064 00)

Install top panel (WP 0061 00)

END OF WORK PACKAGE

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