AIRDRYDT-SA Air Dryer, Refrigerated or Regenerative Desiccant - Semiannual

Application:                                                Man Hours 2
This applies to refrigerated or regenerative desiccant type air dryers
with a capacity of 10 SCFM or greater.  Those units with a capacity of less than
10 SCFM will be maintained in conjunction with the air compressor that they are
associated with.

Special Instructions:

1.  Schedule this maintenance in conjunction with the maintenance on the
    associated air compressor. (PM AIRCOMP-SA).
2.  Review manufacturer's instructions.
3.  Review the Procedure for "Controlling Hazardous Energy
4.  Deenergize, lock and tag electrical circuits.
5.  Comply with the latest provisions of the Clean Air Act and Environmental
    Protection Agency (EPA) regulations as they apply to protection of
    stratospheric ozone.
6.  No intentional venting of refrigerants is permitted.  During the servicing,
    maintenance, and repair of refrigeration equipment, the refrigerant must be
7.  Whenever refrigerant is added or removed from equipment, record the
    quantities on the appropriate forms.
8.  Recover, recycle, or reclaim the refrigerant as appropriate.
9.  If disposal of the equipment item is required, follow regulations concerning
    removal of refrigerants and disposal of the item.
10. If materials containing refrigerants are discarded, comply with EPA
     regulations as applicable.
11. Refrigerant oils to be removed for disposal must be analyzed for hazardous
    waste and handled accordingly.
12. For refrigerant type units, closely follow all safety
    procedures described in the Material Safety Data Sheet (MSDS) for the
    refrigerant and all labels on refrigerant containers.

Items to Check & Initial Completion:

1. ___ Lubricate valves and replace packing, if necessary.
2. ___ Check dryer operating cycle.
3. ___ Inspect and clean heat exchanger.
4. ___ Check outlet dew point.
5. ___ Clean and lubricate blower.
6. ___ Check automatic blow down devices.
7. ___ Inspect and replace or reinstall inlet filters.
8.  Refrigerated Type:
   ___  a.  Check traps.
   ___  b.  Check refrigerant level and moisture content.  If low level or
            moisture is indicated, check for refrigerant leaks using a halogen
            leak detector or similar device.  If leaks are not able to be stopped
            or corrected, report leak status to supervisor.
   ___  c.  Clean and lubricate condenser fan motor.
9.  Desiccant Type:
   ___  a.  Replace filter cartridges, both prefilter and
   ___  b.  Check the inlet flow pressure, temperature and
            purge rate.
   ___  c.  Check the desiccant and replace if necessary.
   ___  d.  Inspect and clean solenoids, purge valves, and

Tools & Materials:

1.  Standard Tool kit.
    Plus  Refrigeration - gauges
          Leak detector-electronic or halogen
          Pocket thermometer
          Clamp on meter (volt - ohm - amp meter)
          Flaring tool
          Tubing cutters
          Packing kit and packing
          Crescent wrenches to 14"
2.  Cleaning equipment, lubricants, approved refrigerants if applicable, and
    materials.  Consult the Material Safety Data Sheets (MSDS) and container
    labels for hazardous ingredients and proper personal protective equipment
3.  Filter cartridges (for desiccant type dryer)
4.  Gasket and packing material
5.  Fin comb
6.  Self sealing quick disconnect refrigerant hose fittings
7.  Refrigerant recovery/recycle unit
8.  EPA/DOT approved refrigerant storage tanks

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