Sterling SDA AP-1 Preventative Maintenance, Cleaning or Replacing the Process Air Filters

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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

57

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Contents SDA Large AP-1 Control Dehumidifying Dryer Unpacking and Inspection Shipping InfoEvent of Shipping Damage If the Shipment is Not CompleteReturns Table of Contents Operation Troubleshooting 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 Sequence of Operation Process/Regeneration CycleAuto Start Timer Standard FeaturesMechanical 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 Material Overdrying Protection Recommended Temperature SettingsMechanical Options Electrical OptionsController Options Safety Circuit Standards Safety Devices and InterlocksSafety Device Lock-Outs Fail Safe OperationPage Mechanical Options Denotes availability Dimensions and Specifications Denotes availabilityDenotes availability Uncrating the Equipment Mechanical InstallationRigging and Placing Unit Making Electrical ConnectionsDescription Making Gas Line Connections Gas-Fired Models OnlyChecking Blower Rotation Checking for Proper Blower RotationDryer/Drying Hopper Process Air Connections Making Dryer/Drying Hopper Process Air ConnectionsProcess Air Heater on Drying Hopper Large Dehumidifying Dryers Mechanical Installation Aftercooler Components & Flow Rates Connecting Aftercooler/Precooler Cooling Water OptionalDrying Hopper Air Trap Using the Drying Hopper Air TrapController Description ControlsDryer Status Screen Startup Screen Process Air Temperature and Conveying Process ControllerDryer 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 Screen DEW Point SetupAutostart Timer Screen Auto StartHelp Menu System Setup SET Clock Hour Meters Alarm History StatusHelp Menu Screen System MenuSystem Backup Service Menu Main Menu System Setup System Setup ScreenLOW Level Detection Setup Autostart Clock Screen Clock Menu ScreenInput Status Hour Meter ScreenInput Status Screen Output StatusSystem Backup Screen ServiceService Menu Screen Alarm Screens Alarm Screen Example Redundant Safety Controller DisplayAlways put your set point to 30F above set point Setting the Redundant Safety ControllerLarge Dehumidifying Dryers Controls Start-up OperationUsing the Dryer Status Screen Alarm Descriptions AlarmsShutdown Maintenance Maintenance SchedulePhotocopy this page for your maintenance records Cleaning or Replacing the Process Air Filters Preventative MaintenanceCalibrating the Dirty Filter Alarm Cleaning or Replacing the Regeneration FilterChecking the Dewpoint Control System Corrective Maintenance Symptoms of Worn Out DesiccantReplacing the Desiccant Replacing the Process Heater Electric Dryers Desiccant Tower AssemblyReplacing the Regeneration Heater Electric Dryers Process Heater Box AssemblyRegeneration Heater Box Assembly Troubleshooting Basic TroubleshootingIntroduction Large Dehumidifying Dryers Troubleshooting Determining Temperature Controller Errors or Sensor Errors Using a ThermocoupleUsing a Platinum Resistance Thermometer Appendix Warranty ReturnsReturned Material Policy Credit ReturnsAnnex B Information Technical SpecificationsSpare Parts List Level 3 Mechanical Components Located on back of Dryer Dryer Identification Serial Number TagTechnical Assistance Service DepartmentParts Department Sales Department