Sterling SDAA 25-100 specifications Replacing the Process Heater, Procedures

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Replacing the Process Heater

The dehumidifying dryers utilize a single-phase Calrod-type heater element. This heater element is mounted in the center compartment below the desiccant beds. Although the replacement procedure is the same for each heater, the wattage varies by model, voltage, temperature range, etc.

WARNING! Hazardous electrical current present.

Disconnect and lock out power before you replace heater elements!

Figure 13: Process Heater Location and Disassembly

Undo (6) 10-32 Button

Head Screws using 1/8

Allen Wrench

1" Wide x 1/8" Thick High

Temperature Gasket

(2) 4-40 screws

Hi Temperature

Snap Switch

Procedures

1.Remove the six (6) 10-32 button head screws securing the process heater access cover using a 1/8” Allen wrench.

2.Sketch the heater wiring configuration so you can properly re-wire the heater.

3.Remove the wires to the heater plate assembly being removed or replaced.

4.Remove the two (2) 4-40 screws securing the heater plate assembly, and slide out the assembly.

5.Remove the heater from the mounting plate by removing the large brass nuts and washers.

6.Re-install the heater and heater plate assemblies in reverse order. Install new heater gaskets and securely tighten all fasteners.

Caution! Heater loops should not touch each other. “Hot spots” lead to premature heater failure!

7. Reinstall the wires based on the sketch you made earlier.

Dehumidifying Dryers

Chapter 5: Maintenance

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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