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Sterling 882.00295.00 6-2Preventative Maintenance, Cleaning or Replacing the Process Air Filters

Models: 882.00295.00

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6-2 Preventative Maintenance

6-2 Preventative Maintenance

Cleaning or Replacing the Process Air Filters

Regular filter cleaning will keep your dryer operating at peak efficiency. The process air filters protect the centrifugal blowers from plastic fines being drawn in from the drying hopper. Filters should be cleaned when airflow restriction trips the dirty filter alarm. Filters should be replaced at least once a year.

Caution! Operating the dryer without the process air filters installed will void the warranty.

On 600-1500 cfm dryers, there is a single high-temperature (up to 350ºF) filter mounted above the process blower on the rear of the dryer. On 2000-3000 cfm dryers, there are two high-temperature (up to 350ºF) filters located in the housing under the blower platform on the left rear corner of the dryer.

Vacuuming. Vacuum cleaning is the preferred method for cleaning the process air filters because compressed air or high-pressure washing can damage the filter. Vacuuming removes most large particles and surface contaminant. Use a commercial duty vacuum cleaner and vacuum the filter from the air intake (dirty) side only.

Compressed Air Cleaning. Blow clean, dry compressed air up and down the pleats, blowing out the filter from the clean side. Do not shoot the air in a criss-cross motion against the grain of the pleats—this won’t clean the filter, and it may damage it. Compressed air should be less than 100 psi—use a 1/8 diameter nozzle at least 2 inches away from the filter.

Figure 13: Process Filter Housing
Stainless Steel		High
Filter Housing	Temeprature
		Gasket
High			High
Temperature			Temperature
Cartridge Filter			Cartridge Filter
	Stainless Steel
Stainless Steel		Filter Housing
Stainless Steel
Filter Housing
Cover	Filter Housing	Filter Housing
	Cover Latches	Cover Latches
High
Temeprature		High
Gasket		Temeprature
		Gasket	Stainless Steel
			Filter Housing
			Cover
600-1500 cfm dryers			2000-3000 cfm dryers

Large Dehumidifying Dryers

Maintenance

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Image 57

Sterling 882.00295.00 6-2Preventative Maintenance, Cleaning or Replacing the Process Air Filters, Process Filter Housing

Contents

AP-1Control SDA 1000-5100Series Large Dehumidifying DryerUnpacking and Inspection Shipping InfoIn the Event of Shipping Damage If the Shipment is Not CompleteWarranty Returns ReturnsCredit Returns CHAPTER 1 SAFETY Table of ContentsCHAPTER 3 MECHANICAL INSTALLATION CHAPTER 2 FUNCTIONAL DESCRIPTIONCHAPTER 7 TROUBLESHOOTING CHAPTER 6 MAINTENANCECHAPTER 4 CONTROLS CHAPTER 5 OPERATIONParts Department Service DepartmentSales Department Contract DepartmentChapter 1 Safety 1-1How to Use This ManualSafety Symbols Used in this Manual Dryer Safety Tags 1-2Warnings and PrecautionsWear SAFETY GLASSES and WORK GLOVES Description1-3Responsibility General ResponsibilityOperator Responsibility Maintenance Responsibility Reporting a Safety Defect What is Desiccant? Chapter 2 Functional Description2-1Models Covered in This Manual 2-2General DescriptionThe Process/Regeneration Cycle Figure 1 Regeneration CycleSequence of Operation 7 day timer 2-3Standard FeaturesAuto Start Timer Mechanical FeaturesDewpoint Extend 2-4OptionsClosed-LoopRegeneration Figure 2 Closed Loop Regeneration2-5Drawings and Diagrams Large Dehumidifying DryersFunctional Description Optional dryer dust collector Large Dehumidifying DryersFunctional Description Process Aftercooler Aftercooler Design SpecificationsFigure 3 Process Aftercooler Process Air Dust CollectorFigure 4 Process Air Dust Collector Large Dehumidifying DryersFunctional Description Recommended Temperature Settings Material Overdrying ProtectionFigure 5 Material Miser/Air Balance Valve Mechanical Options Electrical OptionsController Options Safety Circuit Standards 2-6Safety Devices and InterlocksSafety Device Lock-Outs Fail Safe OperationLarge Dehumidifying Dryers 9 Denotes availability Dimensions and SpecificationsMechanical Options 9 Denotes availabilityElectrical Options Electrical Features9 Denotes availability Large Dehumidifying Dryers3-1Uncrating the Equipment Chapter 3 Mechanical Installation3-2Rigging and Placing Unit 3-3Making Electrical ConnectionsFigure 6 Gas Flow Schematic Make sure all electrical connections are tightMechanical Installation Large Dehumidifying DryersFigure 7 Checking Blower Rotation 3-5Checking for Proper Blower RotationMake sure the hoses are not kinked Large Dehumidifying Dryers Mechanical InstallationProcess Air Heater on Drying Hopper Return air thermocouple locationMechanical Installation Large Dehumidifying DryersReturn air thermocouple location AD600 ModelAD850 AD1000Figure 10 Drying Hopper Air Trap 3-8Using the Drying Hopper Air TrapChapter 4 Controls 4-1Controller DescriptionFigure 11 Controller Screen Descriptions Control Power Switch Disconnect SwitchAlarm Horn & Light Dryer Status Screen Startup Screen4-4Identifying Controller Screens DRYER ALARMS HELP SYSTEM LOG OFFMain Menu Screen Main Menu Screen Typical Dryer Screens Dryer Status ScreenSETTING VALUES Large Dehumidifying DryersControls ALARMS AUTO TUNE DRYER STATUS DRYER SETUP OVER DRY PROTECTDryer Setup Dryer Setup Screen - 1 ofDryer Setup Screen - 3 of Dryer Setup Screen - 2 ofDryer Setup Screen - 4 of Large Dehumidifying DryersOverdry Protection Screen - 1 of OVERDRY PROTECTIONOverdry Protection Screen - 2 of Large Dehumidifying DryersAUTOTUNE Process AutoTune Screen ALARMS Alarm History ScreenAUTO START Autostart Timer Screen DEW POINT SETUP Dew Point Setup ScreenLarge Dehumidifying Dryers ControlsALARM HISTORY I/O STATUS SYSTEM SETUP SET CLOCK HOUR METERSHELP MENU Help Menu Screen MAIN MENU Main Menu ScreenSYSTEM SETUP System Setup Screen SYSTEM BACKUP SERVICE MENU MAIN MENULOW LEVEL DETECTION SETUP Large Dehumidifying DryersAutostart Clock Screen SET CLOCK Clock Menu ScreenINPUT STATUS Input Status Screen Hour Meter ScreenOUTPUT STATUS Output Status HOUR METERSSERVICE Service Menu Screen System Backup ScreenLarge Dehumidifying Dryers ControlsALARMS Alarm History Screen Alarm Screens4-5Redundant Safety Controller Display Alarm Screen ExampleOptional Always put your set point to 30F above set point 4-6Setting the Redundant Safety ControllerControls Large Dehumidifying Dryers5-1 Start-up Chapter 5 OperationDryer Status Screen 5-2Using the Dryer Status ScreenAlarm Alarm History ScreenAlarm AlarmAlarm AlarmAlarm Comment6-1Maintenance Schedule Chapter 6 MaintenanceCleaning or Replacing the Process Air Filters 6-2Preventative MaintenanceFigure 13 Process Filter Housing 600-1500cfm dryersCalibrating the Dirty Filter Alarm Cleaning or Replacing the Regeneration FilterChecking the Dewpoint Control System Do not get in eyes Symptoms of Worn Out DesiccantAvoid prolonged contact with skin Use with adequate ventilationFigure 14 Desiccant Tower Assembly Figure 15 Desiccant Replacement AmountsReplacing the Process Heater Electric Dryers Replacing the Regeneration Heater Electric Dryers Figure 16 Process Heater Box AssemblyFigure 17 Regeneration Heater Box Assembly Chapter 7 Troubleshooting 7-2Basic Troubleshooting7-1Introduction Large Dehumidifying Dryers TroubleshootingUsing a Platinum Resistance Thermometer Using a Thermocouple8-1Warranty Chapter 8 AppendixAnnex B Information 8-2Technical SpecificationsLARGE DRYER SPARE PARTS LIST 600,850,1000 Spare Parts List1250,1500,2000,2500, AND LEVEL 1 Mechanical ComponentsAppendix Large Dehumidifying DryersLEVEL 3 Electrical Components LEVEL 3 Mechanical ComponentsLocated on back of Dryer 8-5Dryer Identification Serial Number TagLarge Dehumidifying Dryers Appendix8-5Technical Assistance Service DepartmentParts Department Sales Department