Sterling 350-2100 CFM Process Heater Replacement Procedure, Desiccant Amounts Required

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Figure 6: Desiccant Amounts Required

Dryer		Desiccant Required per Tower
Model	Large Bead	Small Bead	Total
350	30	76	106
350-RT	30	76	106
425	30	90	120
425-RT	30	90	120
500	40	100	140
500-RT	40	100	140
600	40	120	160
600-RT	40	120	160
700	40	35	175
700-RT	40	35	175
850	120	120	240
850-RT	120	120	240
1000	120	130	250
1000-RT	120	130	250
1250	120	180	300
250-RT	120	180	300
1500	120	240	360
1500-RT	120	240	360
1800	120	310	430
1800-RT	120	310	430
2100	120	360	480
2100-RT	120	360	480

6-9 Process Heater Replacement Procedure

ACS dryers have a number of single phase Calrod-type heater elements wired in a delta formation. They are mounted in the vertical compartment behind the right hand desiccant tower. The number and wattage of the heaters varies with model, voltage, temperature range, etc., but the replacement procedure is the same.

WARNING! Disconnect and lock out power before heater replacement.

1.Remove the bolts securing the process heater access cover.

2.Sketch the heater wiring configuration so the heaters may be re-wired properly. Heaters are mounted on a common plate of three or six for easy maintenance.

3.Remove the jumper bars and wires for the heater plate assembly(ies) being removed or replaced.

4.Remove the bolts securing the heater plate assembly and slide out the assembly. Avoid damaging the gasketing.

5.Remove individual heaters for replacement by removing the large brass nuts and washers.

6.Re-install the heaters and heater plate assemblies in reverse order, replacing gaskets if necessary.

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

7.Re-install the jumper wires and bars according to the sketch made earlier.

8.Re-secure the process heater access cover.

350-2100 cfm Dryers

Chapter 6: Maintenance

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Contents SDA Series 350 2100 CFM Large Dehumidifying DryersWrite Down Your Serial Numbers Here For Future Reference Shipping Info Table of Contents Maintenance How to Use This Manual SafetySafety Symbols Used in this Manual Safety Tag Information Dryer Safety TagsWear Safety Glasses and Work Gloves General Responsibility ResponsibilityOperator Responsibility Maintenance Responsibility RememberReporting a Safety Defect Typical Features and Components Optional FeaturesFunctional Description Models Covered in This ManualClosed Loop Drying System What is Desiccant?Process/Regeneration Cycle Cfm Dryers Functional Description TOP View Left Side View Installation Work RulesElectrical Connections Check For Proper Blower RotationAftercooler Cooling Water Connection Drying Hopper Air TrapTypical Control Panel Control Panel Indicator Lights Control PanelProcess Blower Failure Alarm Switches and Meters Valve Position ErrorProcess Air Temperature Controller PLC ControlProcess Air Temperature Controller Temperature Controller LED Indicators Process Value Numeric LEDTemperature Controller Keys See in Section Optional Communications ProtocolsPre-Startup Checks Startup, Shutdown & OperationStartup Setting the Process Air Temperature Setting the High and Low Temperature AlarmsTo Change the Process Air High Temperature Alarm Setting ShutdownTemperature Controller Autotune Procedure Temperature Controller Internal SwitchesTemperature Controller Anti-Tamper Lockout Switch Enabling the Lockout FeatureChanging the Display from Fahrenheit to Centigrade Setting the Dewpoint Extend Shift PointTo Change the Dewpoint Shift Point Regeneration Monitoring System Signal Processor LL Setpoint Low Regeneration Alarm Setpoint 130FSetpoint Regeneration Blower Shutdown Temp 160F HH Setpoint Heater Cut Off Temp 300FAuxiliary Process Safety System Optional Seven Day Timer OptionalSetting the Current Day of the Week, Hour and Minute Setting the start up timePut the timer into Run mode Setting the stop timeSet the days of the week for automatic operation Filter Cleaning/Replacement MaintenanceServicing the Process Air Filters Models Filter Cleaning/Replacement Servicing the Process Air Filters Models 850 through To Clean the Regeneration Filter Dirty Filter Alarm Calibration Servicing the Regeneration Filter Symptoms of Worn Out Desiccant Dewpoint Control System ServiceTo check the dewpoint sensor and dewpoint control board Desiccant Replacement Procedure First AIDProcess Heater Replacement Procedure Desiccant Amounts RequiredRegeneration Heater Replacement Procedure Spots and lead to premature heater failureRestoring a Temperature Controller to the Factory Setup Switch To select a setting 10F Process Temperature Control Error Messages Regeneration Monitor Signal Processor Error Messages Regeneration Monitor Advanced Programming Moving Between LevelsHysteresis SetpointsInput Shift Security Protection Scale Indication Sensor Input TypeDisplay Refresh Cycle Troubleshooting Problem Possible Cause Corrective ActionProblem Possible Cause Corrective Action Problem Possible Cause Corrective Action Warranty Returns AppendixReturned Material Policy Credit ReturnsCfm Dryers Appendix Preventive Maintenance Checklist Dehumidifying Dryers Service Department Technical AssistanceParts Department Sales Department