Sterling 350-2100 CFM installation manual Maintenance, Servicing the Process Air Filters Models

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Chapter 6: Maintenance

6-1 Servicing the Process Air Filters (Models 350-700)

WARNING: Operating the dryer without the process air filters installed will void the warranty. Filter Cleaning is an important part of dryer maintenance.

Dryer models 350 through 700 have single high temperature [up to 350°F] cartridge cannister-type filter in the process air loop. It’s mounted above the process blower on the rear of the dryer. This filter protects the centrifugal blowers from plastic fines being drawn in from the drying hopper. Regular filter cleaning will keep your dryer operating at peak efficiency.

The filter can be washed or blown out, but remember, the filter’s dirt holding capacity is reduced with each washing. The risk of dirt reaching the clean side of the filter during cleaning, plus possible filter damage from high pressure washing or blowing makes washing a gamble.

Careful cleaning or washing can be done when the airflow restriction trips the dirty filter alarm. Filters should not be washed more than six times or used for more than a year, whichever comes first.

Use a detergent that won’t damage the filter media. Such a detergent permits easy removal of dirt particles through flushing and rinsing. An effective detergent will remove the fine particles from the pores of the filter media.

The filter’s manufacturer recommends FM 1400 washing compound. It is formulated specifically for air filter element cleaning. It is non-sudsing and works in hot or cold water. FM 1400 contains biodegradable synthetic detergents and is non-phosphate, non N.T.A. It is marketed by Filter Service Corp., 2603 A West Main, Farmington, New Mexico, [505] 326-1127.

6-2 Filter Cleaning/Replacement

•Turn off and/or lock out electrical power [and compressed air, if so equipped] to the dryer.

•Remove the hand knobs or threaded fasteners securing the filter access cover and remove the cover.

•Remove the nut on the center retaining rod to remove a filter cartridge.

•Inspect the filter - a damaged filter should not be washed or reused.

•Remove loose dirt from the filter with compressed air or a water hose. Compressed air should be less than 100 psi – use a 1/8"diameter nozzle at least 2" away from the filter. Water should be less than 40 psi – don’t use a nozzle.

•Soak the filter in FM 1400 or comparable detergent solution for at least 15 minutes. Never soak more than 24 hours.

•Swish the filter around in the solution to agitate, loosen dirt particles, and put them in suspension.

•Rinse the filter from the “clean” side to the “dirty” side with a gentle stream of water

350-2100 cfm Dryers

Chapter 6: Maintenance

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Contents Large Dehumidifying Dryers SDA Series 350 2100 CFMWrite Down Your Serial Numbers Here For Future Reference Shipping Info Table of Contents Maintenance Safety Symbols Used in this Manual SafetyHow to Use This Manual Dryer Safety Tags Safety Tag InformationWear Safety Glasses and Work Gloves Operator Responsibility ResponsibilityGeneral Responsibility Remember Maintenance ResponsibilityReporting a Safety Defect Models Covered in This Manual Typical Features and ComponentsOptional Features Functional DescriptionProcess/Regeneration Cycle What is Desiccant?Closed Loop Drying System Cfm Dryers Functional Description TOP View Left Side View Check For Proper Blower Rotation InstallationWork Rules Electrical ConnectionsDrying Hopper Air Trap Aftercooler Cooling Water ConnectionTypical Control Panel Control Panel Control Panel Indicator LightsProcess Blower Failure Alarm Valve Position Error Switches and MetersPLC Control Process Air Temperature ControllerProcess Air Temperature Controller Process Value Numeric LED Temperature Controller LED IndicatorsOptional Communications Protocols Temperature Controller Keys See in SectionStartup Startup, Shutdown & OperationPre-Startup Checks Shutdown Setting the Process Air TemperatureSetting the High and Low Temperature Alarms To Change the Process Air High Temperature Alarm SettingEnabling the Lockout Feature Temperature Controller Autotune ProcedureTemperature Controller Internal Switches Temperature Controller Anti-Tamper Lockout SwitchTo Change the Dewpoint Shift Point Setting the Dewpoint Extend Shift PointChanging the Display from Fahrenheit to Centigrade HH Setpoint Heater Cut Off Temp 300F Regeneration Monitoring System Signal ProcessorLL Setpoint Low Regeneration Alarm Setpoint 130F Setpoint Regeneration Blower Shutdown Temp 160F Seven Day Timer Optional Auxiliary Process Safety System OptionalSetting the start up time Setting the Current Day of the Week, Hour and MinuteSet the days of the week for automatic operation Setting the stop timePut the timer into Run mode Servicing the Process Air Filters Models MaintenanceFilter Cleaning/Replacement Servicing the Process Air Filters Models 850 through Filter Cleaning/ReplacementServicing the Regeneration Filter Dirty Filter Alarm CalibrationTo Clean the Regeneration Filter To check the dewpoint sensor and dewpoint control board Dewpoint Control System ServiceSymptoms of Worn Out Desiccant First AID Desiccant Replacement ProcedureDesiccant Amounts Required Process Heater Replacement ProcedureSpots and lead to premature heater failure Regeneration Heater Replacement ProcedureRestoring a Temperature Controller to the Factory Setup Switch To select a setting 10F Process Temperature Control Error Messages Regeneration Monitor Signal Processor Error Messages Moving Between Levels Regeneration Monitor Advanced ProgrammingInput Shift SetpointsHysteresis Security Protection Display Refresh Cycle Sensor Input TypeScale Indication Problem Possible Cause Corrective Action TroubleshootingProblem Possible Cause Corrective Action Problem Possible Cause Corrective Action Credit Returns Warranty ReturnsAppendix Returned Material PolicyCfm Dryers Appendix Preventive Maintenance Checklist Dehumidifying Dryers Sales Department Service DepartmentTechnical Assistance Parts Department
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