TB-9-2320-279-13-1

TECHNICAL BULLETIN; AIR CONDITIONING SYSTEM

OPERATOR’S, UNIT AND DIRECT SUPPORT MAINTENANCE MANUAL, INSTALLATION INSTRUCTIONS, AND REPAIR PARTS AND SPECIAL TOOLS LISTS

DECEMBER 2005

TB-9-2320-279-13-1 - Page 375 of 524

TB 9-2320-279-13-1

0050-9

AC SYSTEM REFRIGERANT (R-134a) MAINTENANCE - Continued

DRAFT

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NOTE

If two gages indicate pressure, recover refrigerant from service station hoses before

performing Step 6.

6. Select VACUUM and press ENTER on LCD screen (14).

7. Adjust time to 30 minutes.

8. Turn panel low side valve (15) and panel high side valve (16) to 3 o’clock position, then press START.

9. When evacuation time is FINISHED, press EXIT.

10. Turn panel low side valve (15) and panel high side valve (16) to 12 o’clock position, then press NEXT.

NOTE

Any rise in vacuum indicates a leak in the AC system.

11. Monitor low side pressure gage (17) for five minutes.

NOTE

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If there is a change in pressure after five minutes, perform Steps 12 through 15.

Change

of pressure indicates a leak in the system.

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If there is no change in pressure after five minutes, proceed to Step 16, evacuation is

complete.

12. Partially charge AC system.

13. Perform a leak test inspection (WP 0049).

HEMAC193