Sterling SDAA 25-100 Functional Description, Models Covered in This Manual, General Description

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Chapter 2: Functional Description

2-1 Models Covered in This Manual

This manual provides operation, installation, and maintenance instructions for 15, 30, and 60 cfm dehumidifying dryers. Model numbers are listed on the serial tag. Make sure you know the model and serial number of your equipment before contacting the manufacturer for parts or service.

Our dehumidifying mini dryers are designed to generate heated dehumidified air at carefully controlled temperatures for use in plastic drying systems. Drying systems are sized to meet the specific requirements stated by the Customer at the time of purchase.

2-2 General Description

Dehumidifying dryers are used to generate very low dew point air heated to a controlled temperature for drying plastic pellets and regrind.

Our dryers force hot, dry air through resin in a drying hopper, where air picks up moisture from the material and draws it back to the dryer. In the dryer, a desiccant bed strips moisture from the air. The dried process air is then re-heated and delivered back into the drying hopper to continue to remove moisture.

Figure 15: Typical Dryer Air Flow Schematic

Moisture

Exhaust

Valve

High pressure prepheral blower

Drying Hopper

Filter (Separates

Dust)

Ambient

Air Flow

Dehumidifying Dryers

Chapter 2: Functional Description

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Contents Sdaa 25-100 15-60 cfm Dehumidifying Dryers Shipping Information Table of Contents Maintenance Service Department Sales Department Contract Department Safety How to Use This ManualSafety Symbols Used in this Manual Wear Safety Glasses and Work Gloves Responsibility General ResponsibilityOperator Responsibility RememberMaintenance Responsibility Reporting a Safety DefectDehumidifying Dryers Safety Functional Description Models Covered in This ManualGeneral Description Standard Features What is desiccant?Mechanical Features Electrical FeaturesSafety Devices and Interlocks Controller FeaturesOptions Safety Circuit Standards Safety Device Lock-OutsFail Safe Operation Installation Uncrating the EquipmentRigging and Placing the Dryer Machine-Mount Dryer Dimensions Floor-Mount Dryer Dimensions Suggested Lift Rigging for Cart Mounted Dryers Recommended Dryer Lifting HardwareElectrical Connections Suggested Lift Rigging for Machine Mounted DryersSetup Procedures Three-Phase ModelsChecking for Proper Blower Rotation Making Dryer/Drying Hopper Process Air ConnectionsInstalling Water Lines Hose and Hose Clamp Drying Hopper Air Trap ConsiderationsOptional Aftercooler Auto-Tuning the Dryer Initial Start-upPre-Startup Checks Starting Up the DryerShutting Down the Dryer Operation Start-upSwitches Indicator LightsController Description and Operation Process Air Temperature Controller Lit when Control Output 1 is on. The Out1Lit when Control Output 2 is on. Not used Indicator Name Description Lights in the Operation Indicator Section whenIdentifying Temperature Controller Keys Setting the Process Air TemperatureE5CN Operating Parameters Adjustment Level Indicator Name Description Tuned prior to dryer startupEntering Operating Parameters to Select Modes ON, OFFSetting the High Dew Point Alarm Process Air Dew Point DisplayOptional Redundant Safety Controller Display Setting the Redundant Safety ControllerWatlow Operating Parameters Mode Parameter Setting range Default Manf. setting Dryer Operation Procedures Model Heating Cooling 15 cfm 30 cfm 60 cfm Page Controller Operation With Optional Alarm Horn & Reset Button Page Alarm Display Messages Auto-Tuning the Dryer Shutting Down the DryerMaintenance Preventative Maintenance SchedulePhotocopy this page for your maintenance records Preventative Maintenance Recommendations for Cleaning and Replacing FiltersServicing Process Air Filters VacuumingCleaning with Compressed Air Servicing the Dew Point MonitorCorrective Maintenance Symptoms of Worn DesiccantFirst AID Replacing Worn DesiccantConsult local disposal regulations for more information Procedures Replacing the Process HeaterTroubleshooting Problem Possible cause Corrective actionIntroduction Problem Possible cause Corrective action Check resin manufacturer’s data Determining Temperature Controller Errors or Sensor Errors Using a ThermocoupleUsing a Platinum Resistance Thermometer Warranty Warranty SpecificationsWarranty Restrictions AppendixWarranty Liabilities Optional ComponentsCustomer Responsibilities Technical Specifications Annex B InformationDrawings and Diagrams Spare Parts List Aftercooler Design SpecificationsLevel 2 & 3 Spare Parts List Electrical & Mechanical Safety Tag Information Warranty ReturnsDryer Safety Tags Returned Material PolicyDryer Identification Serial Number Tag Located on back of DryerService Department Technical AssistanceParts Department Sales Department