Drying Hopper Air Trap Considerations | Sterling SDAA 25-100

Drying Hopper Air Trap Considerations

Our exclusive air trap assembly on the top of the drying hopper prevents ambient air from contaminating the material being dried. To ensure that your unit will operate at peak efficiency, do the following:

•Keep the material level at the mid point of the air trap

•This can be achieved by utilizing a hopper loader or vacuum conveying system to supply material to the drying system.

Figure 1: Drying Hopper Air Trap

				Flapper Valve
Suggested material level					of the loader
Suggested material level
for the optimum					Return air from the
efficiency.					drying hopper.
efficiency.					drying hopper.

Air Trap

Insulation

Delivery low dew point, heated air to the drying hopper.

Recommended process

temperature control

thermocouple location.

Optional Aftercooler

Water-cooled 15/30/60 cfm models use a water-to-air heat exchanger as an aftercooler. Cooling water is required for this design (3 gpm at 85°F or lower). Return air from the hopper passes through the air filter to trap fines and dust before entering the heat exchanger.

Installing Water Lines

(Hose and Hose Clamp)

When installing the water lines, ensure that the aftercooler utilizes either tower, chilled or city water as warm as 85°F (29°C). Recommended flow rate is three (3 gpm) gallons per minute (11 liters per minute).

Dehumidifying Dryers

Chapter 3: Installation

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Sterling SDAA 25-100 specifications Drying Hopper Air Trap Considerations, Optional Aftercooler

Contents

Sdaa 25-100 15-60 cfm Dehumidifying Dryers Shipping Information Table of Contents Maintenance Service Department Sales Department Contract Department How to Use This Manual SafetySafety Symbols Used in this Manual Wear Safety Glasses and Work Gloves Responsibility General Responsibility Operator Responsibility Remember Maintenance Responsibility Reporting a Safety Defect Dehumidifying Dryers Safety Models Covered in This Manual Functional DescriptionGeneral Description Mechanical Features Standard FeaturesWhat is desiccant? Electrical Features Controller Features Safety Devices and InterlocksOptions Safety Device Lock-Outs Safety Circuit StandardsFail Safe Operation Uncrating the Equipment InstallationRigging and Placing the Dryer Machine-Mount Dryer Dimensions Floor-Mount Dryer Dimensions Suggested Lift Rigging for Cart Mounted Dryers Recommended Dryer Lifting Hardware Electrical Connections Suggested Lift Rigging for Machine Mounted Dryers Checking for Proper Blower Rotation Setup ProceduresThree-Phase Models Making Dryer/Drying Hopper Process Air Connections Drying Hopper Air Trap Considerations Installing Water Lines Hose and Hose ClampOptional Aftercooler Pre-Startup Checks Auto-Tuning the DryerInitial Start-up Starting Up the Dryer Shutting Down the Dryer Operation Start-up Indicator Lights SwitchesController Description and Operation Lit when Control Output 1 is on. The Out1 Process Air Temperature ControllerLit when Control Output 2 is on. Not used Identifying Temperature Controller Keys Indicator Name DescriptionLights in the Operation Indicator Section when Setting the Process Air Temperature E5CN Operating Parameters Adjustment Level Indicator Name Description Tuned prior to dryer startup Entering Operating Parameters to Select Modes ON, OFF Process Air Dew Point Display Setting the High Dew Point AlarmOptional Setting the Redundant Safety Controller Redundant Safety Controller DisplayWatlow 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 Dryer Preventative Maintenance Schedule MaintenancePhotocopy this page for your maintenance records Servicing Process Air Filters Preventative MaintenanceRecommendations for Cleaning and Replacing Filters Vacuuming Cleaning with Compressed Air Servicing the Dew Point Monitor Corrective Maintenance Symptoms of Worn Desiccant First AID Replacing Worn Desiccant Consult local disposal regulations for more information Procedures Replacing the Process Heater Problem Possible cause Corrective action TroubleshootingIntroduction Problem Possible cause Corrective action Check resin manufacturer’s data Using a Thermocouple Determining Temperature Controller Errors or Sensor ErrorsUsing a Platinum Resistance Thermometer Warranty Restrictions WarrantyWarranty Specifications Appendix Optional Components Warranty LiabilitiesCustomer Responsibilities Technical Specifications Annex B Information Drawings and Diagrams Spare Parts List Aftercooler Design Specifications Level 2 & 3 Spare Parts List Electrical & Mechanical Dryer Safety Tags Safety Tag InformationWarranty Returns Returned Material Policy Dryer Identification Serial Number Tag Located on back of Dryer Parts Department Service DepartmentTechnical Assistance Sales Department