Sterling SDA Series 25-100 specifications Replacing the Process/Regeneration Heater, Procedures

Page 34

Replacing the Process/Regeneration Heater

Replacing the Process/Regeneration Heater

The dehumidifying dryers utilize a single-phase Calrod-type heater element. This heater element is mounted in the center compartment in 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 12: Process/Regeneration Heater Location and Disassembly

Valve & Air

Manifold Casting

	Hollow
Desiccant	Desiccant
Desiccant	Tank

Assembly Rod

Gasket

Regeneration

Heater

Wire Conduit
Assembly	Lower Air Manifold Casting
	Lower Air Manifold Casting

Procedures

1.Disconnect electrical power to the dryer.

2.Using a 1/8” Allen wrench, remove the 10-24 button head screws holding the top, back and side panels to the dryer frame.

3.Disconnect the plug for the valve motor, valve switch, and blower (15 only).

4.Remove the four (4) nuts at each corner of the top casting.

15, 30, & 60 cfm Compact Dryers

34

Image 34

Contents SDA Series 15-60cfm Compact Dehumidifying Dryers In the Event of Shipping Damage Shipping InformationUnpacking and Inspection If the Shipment is Not CompleteCHAPTER 1 SAFETY Table of ContentsCHAPTER 3 INSTALLATION CHAPTER 2: FUNCTIONAL DESCRIPTIONCHAPTER 7 APPENDIX CHAPTER 5 MAINTENANCECHAPTER 6 TROUBLESHOOTING 15, 30, & 60 cfm Compact Dryers1-1How to Use This Manual Chapter 1 SafetySafety Symbols Used in this Manual Read Operation and Installation Manual 1-2Safety Tag Information1-3Warnings and Precautions Dryer Safety TagsGeneral Responsibility 1-4ResponsibilityOperator Responsibility REMEMBER Maintenance Responsibility Reporting a Safety Defect2-2General Description Chapter 2 Functional Description2-1Models Covered in This Manual What is desiccant?Mechanical Features 2-3Standard FeaturesFigure 1 Typical Dryer Air Flow Schematic Electrical Features2-4Options 2-5Safety Devices and InterlocksController Features Safety Device Lock-Outs Safety Circuit StandardsFail Safe Operation 3-1Uncrating the Equipment Chapter 3 Installation3-2Rigging and Placing the Dryer 15, 30, & 60 cfm Compact Dryers POWER ONDEW POINT 3-3Electrical Connections Checking for Proper Blower Rotation 3-4Setup ProceduresThree-PhaseModels Floor Mount ModelsDrying Hopper Air Trap Considerations 3-5Initial Start-upInstalling Water Lines Optional AftercoolerAuto-Tuningthe Dryer Shutting Down the DryerSwitches Chapter 4 Operation4-1Controller Description and Operation Indicator LightsProcess Air Temperature Controller PV SVLit when Control Output 2 is on. Not used in IndicatorLit when Control Output 1 is on. The Out1 IndicatorAdjustment Level Setting the Process Air TemperatureIndicator IndicatorDescription IndicatorName Entering Operating Parameters to Select ModesProcess Air Dew Point Display Setting the High Dew Point AlarmOptional 4-2Dryer Operation Procedures Controller OperationAlarm Display Messages Valve Motor Time-Out Blower Overload No Alarms HIGH TEMP VALVE MTRHEAT COOL 50 SYSTEM NORMAL PROC BLWREvery Day Chapter 5 Maintenance5-1Preventative Maintenance Schedule Every weekServicing Process Air Filters 5-2Preventative MaintenanceFigure 9 Air Filter Location and Disassembly VacuumingSymptoms of Worn Desiccant 5-3Corrective MaintenanceCleaning with Compressed Air Servicing the Dew Point Monitor+ FIRST AID + Replacing Worn DesiccantFigure 10 Desiccant Bed Location and Disassembly Figure 11 Required Desiccant Amounts 13X TypeReplacing the Process/Regeneration Heater ProceduresWARNING! Hazardous electrical current present Replacement Procedures Replacing/Cleaning the Cooling CoilFigure 13 Cooling Coil Location and Disassembly If used as an after-Cooler 3 to 4 GPM @ 85F9.Turn the water to the cooling coil back on 8.Inset the four 10-32bolts back in place15, 30, & 60 cfm Compact Dryers 6-1Introduction Chapter 6 TroubleshootingHIGH TEMP HIGH TEMP PROC BLWRAlarm Message CauseAlarm Message VALVE MTRUsing a Thermocouple CauseWarranty Specifications 7-1WarrantyChapter 7 Appendix Warranty RestrictionsCustomer Responsibilities 7-2Technical SpecificationsAnnex B Information Regeneration MoistureMake Up Air Exhaust 7-3Drawings and DiagramsAftercooler Design Specifications High Pressure Peripheral BlowerExhaust Figure 16 Low Heat Model 120F to 250F Air FlowAfter-Cooler Regeneration MoistureMake Up Air High Pressure Peripheral Blower15, 30, & 60 cfm Compact Dryers 7-4Spare Parts ListDRYER SPARE PARTS LIST 15, 30, 60 cfm Models Mechanical Components15, 30, & 60 cfm Compact Dryers HI-COREDESICCANT DRYER 15/30/60 CFM UNITS30 CFM 15, 30, & 60 cfm Compact DryersDescription 60 CFM 15, 30, & 60 cfm Compact DryersDescription 120V CONTROL COMMON PARTS 15, 30, & 60 cfm Compact DryersA0571672 Description7-5Returned Material Policy Credit ReturnsWarranty Returns 7-6Dryer Identification Serial Number Tag7-7Technical Assistance Service DepartmentContract Department 15, 30, & 60 cfm Compact Dryers