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TM  10-4130-239-14 5-7. REFRIGERATION SYSTEM SERVICE - EVACUATION (CONT) 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. CAUTION DO NOT operate compressor until directed to do so in the charging procedure. NEVER run the system without  refrigerant. Open both service manifold valves to show pressures on gauges. Start vacuum Pump. Open evacuation manifold valve. Vacuum  gauge will  drop  rapidly approaching  29-30 After a vacuum of manifold valves. at first then more slowly but steadily inches Hg. 28 in. Hg.   is  achieved,  close  all  service Turn off vacuum pump. Open charging manifold valve (hose suction service manifold valve and gauge readings reach O psi. Close from refrigerant tank) and watch gauges. Stop flow when charging  manifold  valve. Start vacuum pump. Open evacuation manifold valve. Vacuum  gauge will drop rapidly at first then more slowly but steadily approaching 29-30 inches Hg. After a vacuum of 28 in. Hg. is achieved, close all service manifold valves. Turn off vacuum pump. Open charging manifold valve (hose from refrigerant tank) and suction  service  manifold  valve  and  watch  gauges. Stop flow when gauge readings reach O psi. Close  charging  manifold  valve. Start vacuum pump. Vacuum gauge will drop rapidly at first then more slowly but steadily approaching 29-30 inches Hg. After a vacuum of 28 in. Hg. is achieved, close all service manifold  valves. Turn off vacuum pump. Open refrigerant valve and suction service manifold valve and watch gauges. Stop flow when gauge readings reach O psi. Start vacuum pump. Vacuum gauge will drop rapidly at first then more slowly but steadily approaching 29-30 inches Hg. 5-15

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