Sterling SDA Series 25-100 specifications Troubleshooting, 6-1Introduction, High Temp

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Chapter 6: Troubleshooting

6-1 Introduction

The utmost in safety precautions should be observed at all times when working on or around the machine and the electrical components. All normal trouble-shooting must be accomplished with the power off, line fuses removed, and with the machine tagged as out of service.

The use of good quality test equipment cannot be over-emphasized when troubleshooting is indicated. Use a good ammeter that can measure at least twice the AC and DC current that can be encountered for the machine. Be sure that the voltmeter has at least minimum impedance of 5,000 OHMS-per-volt on AC and 20,000 OHMS-per-volt on DC scales. Popular combination meters, VOM and VTVM can be selected to provide the necessary functions.

Before making haphazard substitutions and repairs when defective electrical components are malfunctioning, we recommend that you check the associated circuitry and assemblies for other defective devices. It is common to replace the obviously damaged component without actually locating the real cause of the trouble. Such hasty substitutions will only destroy the new component. Refer to wiring diagrams and schematics.

Locating mechanical problems, should they occur, is relatively straightforward. When necessary, refer to the parts catalog section.

Alarm Message	Cause	Corrective Action	Dryer Status

HIGH TEMP	The process	Make sure the process filter	- Dryer Shuts down:
	temperature has	is clean. Clean or replace if	- Process blower OFF.
	exceeded the alarm	necessary.	- Process heaters OFF.
	set point.		- Regen heaters OFF.
	set point.	Double check the alarm set	- Regen heaters OFF.
		point.	- Alarm light is ON
	The high temperature	point.	- Alarm light is ON
	snap switch of the	Check the positioning of the	- Alarm horn is ON.
	process heater box	thermocouple inside the air
	has tripped.	inlet of the drying hopper.
	has tripped.	The tip of the thermocouple
		The tip of the thermocouple
		should be centered to the
	The high temperature	should be centered to the
	snap switch on of the	tube, and not touching any
	regeneration heater	metal part of the tube.
	boxes has tripped	The drying temperature set
		point is lower than dryer
		capabilities. Check the dryer
		specs.
		Make sure all the hose
		connections are tight.
		Make sure the regeneration
		timing cycle matches the
		specs. If not contact Service
		department.

15, 30, & 60 cfm Compact Dryers

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Contents SDA Series 15-60cfm Compact Dehumidifying Dryers Unpacking and Inspection Shipping InformationIn the Event of Shipping Damage If the Shipment is Not CompleteCHAPTER 3 INSTALLATION Table of ContentsCHAPTER 1 SAFETY CHAPTER 2: FUNCTIONAL DESCRIPTIONCHAPTER 6 TROUBLESHOOTING CHAPTER 5 MAINTENANCECHAPTER 7 APPENDIX 15, 30, & 60 cfm Compact Dryers1-1How to Use This Manual Chapter 1 SafetySafety Symbols Used in this Manual 1-3Warnings and Precautions 1-2Safety Tag InformationRead Operation and Installation Manual Dryer Safety TagsGeneral Responsibility 1-4ResponsibilityOperator Responsibility REMEMBER Reporting a Safety Defect Maintenance Responsibility2-1Models Covered in This Manual Chapter 2 Functional Description2-2General Description What is desiccant?Figure 1 Typical Dryer Air Flow Schematic 2-3Standard FeaturesMechanical Features 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 Three-PhaseModels 3-4Setup ProceduresChecking for Proper Blower Rotation Floor Mount ModelsInstalling Water Lines 3-5Initial Start-upDrying Hopper Air Trap Considerations Optional AftercoolerShutting Down the Dryer Auto-Tuningthe Dryer4-1Controller Description and Operation Chapter 4 OperationSwitches Indicator LightsPV SV Process Air Temperature ControllerLit when Control Output 1 is on. The Out1 IndicatorLit when Control Output 2 is on. Not used in IndicatorIndicator Setting the Process Air TemperatureAdjustment Level IndicatorName IndicatorDescription Entering Operating Parameters to Select ModesProcess Air Dew Point Display Setting the High Dew Point AlarmOptional Controller Operation 4-2Dryer Operation ProceduresAlarm Display Messages HEAT COOL 50 SYSTEM NORMAL HIGH TEMP VALVE MTRValve Motor Time-Out Blower Overload No Alarms PROC BLWR5-1Preventative Maintenance Schedule Chapter 5 MaintenanceEvery Day Every weekFigure 9 Air Filter Location and Disassembly 5-2Preventative MaintenanceServicing Process Air Filters VacuumingCleaning with Compressed Air 5-3Corrective MaintenanceSymptoms of Worn Desiccant Servicing the Dew Point MonitorReplacing Worn Desiccant + FIRST AID +Figure 11 Required Desiccant Amounts 13X Type Figure 10 Desiccant Bed Location and DisassemblyReplacing the Process/Regeneration Heater ProceduresWARNING! Hazardous electrical current present Figure 13 Cooling Coil Location and Disassembly Replacing/Cleaning the Cooling CoilReplacement Procedures 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 Alarm Message PROC BLWRHIGH TEMP CauseUsing a Thermocouple VALVE MTRAlarm Message CauseChapter 7 Appendix 7-1WarrantyWarranty Specifications Warranty RestrictionsCustomer Responsibilities 7-2Technical SpecificationsAnnex B Information Aftercooler Design Specifications 7-3Drawings and DiagramsRegeneration MoistureMake Up Air Exhaust High Pressure Peripheral BlowerAfter-Cooler Regeneration MoistureMake Up Air Figure 16 Low Heat Model 120F to 250F Air FlowExhaust High Pressure Peripheral BlowerDRYER SPARE PARTS LIST 15, 30, 60 cfm Models 7-4Spare Parts List15, 30, & 60 cfm Compact Dryers Mechanical ComponentsHI-COREDESICCANT DRYER 15/30/60 CFM UNITS 15, 30, & 60 cfm Compact Dryers30 CFM 15, 30, & 60 cfm Compact DryersDescription 60 CFM 15, 30, & 60 cfm Compact DryersDescription A0571672 15, 30, & 60 cfm Compact Dryers120V CONTROL COMMON PARTS DescriptionCredit Returns 7-5Returned Material Policy7-7Technical Assistance 7-6Dryer Identification Serial Number TagWarranty Returns Service Department15, 30, & 60 cfm Compact Dryers Contract Department