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CHAPTER 2 OPERATING INSTRUCTIONSí
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TM-5-4210-218-13P Air Conditioner Vertical Compact 6 000 BTU Manual
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OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES PROCEDURES
TM 5-4210-218-13&P 1. INLET PRESSURE gauge.  Indicates the pump inlet pressure from minus 20 psi (minus 138 kPa) to plus 600 psi (4137 kP3). 2. THERMOMETER.  Used to determine ambient temperature for nitrogen pressurization.  Mounted on rear of scale column.  i  3. NITROGEN   REGULATOR.      Used   to   set   correct   nitrogen   pressure   according   to   ambient temperature. 4. TARE KNOB.  Used to zero scale dial prior to filling extinguisher cylinder with Halon. 5. SCALE.  Shows weight of Halon placed in extinguisher cylinder to avoid overfill. 6. EXTINGUISHER HOSE valve.  Position allows or stops flow to or from the extinguisher cylinder. 7. OUTLET PRESSURE gauge.  Indicates pump outlet pressure from 0 to 2000 psi (0-13789 kPa). 8. AGITATOR  BRACKET.    Provides  mounting  for  extinguisher  cylinder  adapters.    Secures  extinguisher  cylinder during recovery and charging operations.  Used  to  shake  extinguisher  after  nitrogen  pressurization  to  achieve  a stabilized extinguisher pressure reading. 9. AIR FILTER / REGULATOR.  Connection point for external compressed air source needed to drive transfer unit pump air motor.  Regulator controls air pressure to air motor and filter removes water or other contaminants that could damage motor. 10. UNIT OPERATION valve.  Position determines unit function in either recovery or recharge of extinguisher cylinder. 11. HALON / NITROGEN valve.  Position determines if flow is through the pump.  HALON position also used to direct flow to the recovery cylinder. 12. PUMP valve.  Position determines if pump is ON or OFF. 13. HALON HOSE valve.  Position allows or stops flow from the Halon cylinder or to the recovery cylinder. 14. HALON  CYLINDER  ADAPTER  WITH  GAUGE  (O  to  1000  psi)  (0-6895  kPa).    Acts  as  interface  between  the cylinders and hoses and when on the recovery cylinder indicates pump pressure required to force Halon/nitrogen mix into the recovery cylinder. SECTION II.  OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES 2-2 GENERAL. a. Operator   Preventive   Maintenance   Checks   and   Services   (PMCS)   are   performed   to   be   sure   the   Recovery   / Recharger Unit is ready for use at all times.  These checks and services help you find and fix defects before the Recovery / Recharger Unit is damaged or fails. b. If minor defects are found while the Recovery / Recharger Unit is operating, take notes on the cause and effect of each defect.  Fix or have each defect fixed after you have stopped operating the Recovery / Recharger Unit. c. Record all defects and steps taken to fix them as soon as possible.  See DA PAM 738-750. 2-2

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