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SYSTEM   DISCHARGE.
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TM-5-4120-375-14 Air Conditioner Horizontal Compact 18 000 BTU 208 Volt 3 Phase 50/60 Hertz NSN
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REPLACING  TUBING, Purge system with to 1200 F creates FITTINGS  OR  REFRIGERANT  COMPONENTS
TM5-4120-375-14 5-13.  DISCHARGING  THE  REFRIGERANT  (cont.). c.  Remove  caps  from  discharge  (4)  and  suction  (5)  service  valves. d.  Install  changing  manifold  hoses  to  air  conditioner  service  valves. NOTE In  accordance  with  Environmental  Protection  Agency  regulations  refrigerants  cannot  be discharged into the atmosphere. A refrigerant recovery & recycling unit must be used whenever discharging the refrigerant system. Operation of  the recovery/recycling  unit  must  be  by  AUTHORIZED  PERSONNEL 0NLY e. Connect  and  operate  a  recovery/recycling  unit  in  accordance  with  the  manufacturer’s  instructions. f. Connect a cylinder of dry nitrogen (item 8, table D-1) to the gauge port of the discharge service valve. Open the cylinder shutoff valve and the discharge service valve slightly and completely open the suction service valve to purge the system of refrigerant gas. Use 1-2 cfm (0. 1.02 M 3/minute). NOTE Dry nitrogen is always used to purge the refrigeration system during brazing or debrazing of connections, to prevent internal oxidation scaling. Change 2 5-9

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