Sterling 882.00295.00 specifications Corrective Maintenance, Symptoms of Worn Out Desiccant

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6-3 Corrective Maintenance

Symptoms of Worn Out Desiccant

The moisture adsorption capacity of the desiccant used in Large Dehumidifying Dryers degrades after an indefinite period of time. Useful life depends on variables such as material moisture content, plasticizer vapors in the return air and number of regeneration cycles.

Your dryer may need new desiccant if it exhibits any of the following symptoms:

•The plastic material is not being dried sufficiently (high scrap/reject rate).

•The air temperature at the top of the regenerating desiccant bed rapidly climbs to 350°F or more shortly after the start of regeneration, even though a saturated bed has just started heating.

•The process air dewpoint, measured with a portable dewpoint monitor, is higher than -10°F throughout the process drying cycle.

•Smoke or dust is being blown out of the process air outlet.

•Noticeable amounts of desiccant in the beds is a medium-brown color, or darker.

If any of these signs are noticed, the desiccant in the desiccant beds should be replaced. Desiccant replacement kits are available from the Parts Department. If you wish, the desiccant beds can be repacked at your site by a service technician.

WARNING! DESICCANT MATERIAL CAUSES EYE IRRITATION BREATHING MAY BE HARMFUL/MAY CAUSE SKIN IRRITATION!

•Do not get in eyes.

•Avoid prolonged contact with skin.

•Use with adequate ventilation.

•Wash thoroughly after handling.

FIRST AID:

In case of eye contact, immediately flush eyes with plenty of water for at least 15 minutes. If irritation persists, see a physician.

Replacing the Desiccant

Follow the procedure below to change the desiccant. See Figure 14 below for desiccant tower components.

1.Disconnect electrical power to the dryer.

2.Remove the bolts and nuts securing the covers of each desiccant canister. Remove the covers and set them aside.

3.With a shop vacuum that has a 4 micron HEPA filter, carefully remove all desiccant from each tower.

4.Inspect all screens for tears or burn-through spots.

5.Fill each canister with 13X, 8 x 12 bead desiccant.

Large Dehumidifying Dryers

Maintenance

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Contents SDA 1000-5100 Series Large Dehumidifying Dryer AP-1 Control Shipping Info Unpacking and InspectionEvent of Shipping Damage If the Shipment is Not CompleteReturns Credit ReturnsTable of Contents Operation Large Dehumidifying Dryers Safety How to Use This ManualSafety Symbols Used in this Manual Dryer Safety Tags Description Responsibility General ResponsibilityOperator Responsibility Maintenance Responsibility Reporting a Safety Defect Functional Description Models Covered in This ManualGeneral Description Process/Regeneration Cycle Sequence of OperationStandard Features Auto Start TimerMechanical Features Electrical FeaturesOptions Dewpoint ExtendClosed-Loop Regeneration Drawings and Diagrams Optional dryer dust collector Aftercooler Design Specifications Process AftercoolerProcess Air Dust Collector Process Air Dust Collector Recommended Temperature Settings Material Overdrying ProtectionMechanical Options Electrical OptionsController Options Safety Devices and Interlocks Safety Circuit StandardsSafety Device Lock-Outs Fail Safe OperationPage Dimensions and Specifications Denotes availability Mechanical Options Denotes availabilityDenotes availability Mechanical Installation Uncrating the EquipmentRigging and Placing Unit Making Electrical ConnectionsMaking Gas Line Connections Gas-Fired Models Only DescriptionChecking for Proper Blower Rotation Checking Blower RotationMaking Dryer/Drying Hopper Process Air Connections Dryer/Drying Hopper Process Air ConnectionsProcess Air Heater on Drying Hopper Large Dehumidifying Dryers Mechanical Installation Connecting Aftercooler/Precooler Cooling Water Optional Aftercooler Components & Flow RatesUsing the Drying Hopper Air Trap Drying Hopper Air TrapControls Controller DescriptionProcess Air Temperature and Conveying Process Controller Dryer Status Screen Startup ScreenDryer Alarms Help System LOG OFF Identifying Controller ScreensMain Menu Screen Setting Values Dryer Status Dryer Setup Over DRY Protect Alarms Auto Tune Dryer MenuAuto Start Main Menu Dryer Setup Screen 2 Dryer Setup Screen 3Dryer Setup Screen 4 Overdry Protection Overdry Protection Screen 1Overdry Protection Screen 2 Alarm History Screen AutotuneProcess AutoTune Screen DEW Point Setup Dew Point Setup ScreenAutostart Timer Screen Auto StartSystem Setup SET Clock Hour Meters Alarm History Status Help MenuHelp Menu Screen System MenuSystem Backup Service Menu Main Menu System Setup System Setup ScreenLOW Level Detection Setup Clock Menu Screen Autostart Clock ScreenHour Meter Screen Input StatusInput Status Screen Output StatusSystem Backup Screen ServiceService Menu Screen Alarm Screens Redundant Safety Controller Display Alarm Screen ExampleSetting the Redundant Safety Controller Always put your set point to 30F above set pointLarge Dehumidifying Dryers Controls Operation Start-upUsing the Dryer Status Screen Alarms Alarm DescriptionsShutdown Maintenance Maintenance SchedulePhotocopy this page for your maintenance records Preventative Maintenance Cleaning or Replacing the Process Air FiltersCleaning or Replacing the Regeneration Filter Calibrating the Dirty Filter AlarmChecking the Dewpoint Control System Corrective Maintenance Symptoms of Worn Out DesiccantReplacing the Desiccant Desiccant Tower Assembly Replacing the Process Heater Electric DryersProcess Heater Box Assembly Replacing the Regeneration Heater Electric DryersRegeneration Heater Box Assembly Troubleshooting Basic TroubleshootingIntroduction Large Dehumidifying Dryers Troubleshooting Determining Temperature Controller Errors or Sensor Errors Using a ThermocoupleUsing a Platinum Resistance Thermometer Warranty AppendixTechnical Specifications Annex B InformationSpare Parts List Level 3 Mechanical Components Dryer Identification Serial Number Tag Located on back of DryerService Department Technical AssistanceParts Department Sales Department

882.00295.00 specifications

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