TM 5-4220-233-14b.Recharging Storage CylindersFigure 2-6. Recharging Servicing Unit After Long Term StorageWARNINGThe storage cylinders must be purged of dry nitrogen prior to filling withbreathing air. Failure to follow this warning may result in an unsafebreathing media.(1) Remove dust cap from recharge port (1).(2) Slowly open all eight 1/4-turn ball valves (2).(3) Open recharge valve (3) to vent dry nitrogen from storage cylinders.WARNINGThe storage cylinders should only be filled with compressed breathing airper BB-A-1034B, Grade A. Failure to follow this warning may result incontamination of the Servicing Unit and any SCUBA cylinders filled by theServicing Unit.(4) Using an adaptor, connect fill hose from the appropriate compressed air source to recharge port (1).(5) Allow the cylinder to be recharged to approximately 300 psi in accordance with applicable T.M.(6) Close recharge valve (3).(7) Bleed pressure from the compressed air source fill hose per applicable T.M ,then disconnect the hose from the recharge port.(8) Slowly open recharge valve to vent pressure from storage cylinders.(9) Reconnect fill hose from the appropriate compressed air source to recharge port (1).(10) Allow the cylinder to be recharged to approximately 300 psi in accordance with applicable T.M.(11) When cylinder(s) have been recharged close recharge valve.(12) Bleed pressure from the compressed air source fill hose,per applicable T.M. then disconnect the hose from recharge port.(13) Take an air purity sample If sample is good continue to paragraph 2-7. If sample is badCompressed Gas System may be contaminated. Notify unit maintenance.2-22
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