Options, Dewpoint Extend | Sterling SDA AP-1 manual

•Sequence shutdown switch

;NFPA86, UL, AGA & CGA machinery electrical standards (Gas Dryers)

;Available supply voltages of 208, 230, 460, 575/3/60 and 400/3/60

2-4 Options

Dewpoint Extend

The Dewpoint Extend option measures the temperature of the moist air as it is bled to the atmosphere after regeneration. After a period of time, the bleed temperature will rise. This condition, called "bed breakthrough" indicates that the bed is dry. At bed breakthrough, the bleed air temperature peaks between 350°F and 400°F.

The regeneration heaters turn off automatically on bed breakthrough for additional energy savings. A 550°F regeneration temperature will dry the desiccant beds sufficiently to produce process air dewpoint of -40°F. In a properly sized system, this ultra-low humidity level will be more than adequate to dry plastics to as little as .003% moisture.

Closed-Loop Regeneration

An optional regeneration closed-loop valve and heat exchanger can be used to close the regeneration loop during the cooling portion of the regeneration cycle. If this option is enabled on the dryer, air will be bled to the atmosphere until the heating portion of the regeneration cycle is finished. Then, the regeneration closed loop valve will direct air through a water-cooled heat exchanger and back into the regeneration loop (see Figure 2).

		Figure 2: Closed Loop Regeneration
		Regeneration		Regeneration
		Blower		Blower
	AD600-AD1500		AD600-AD1500
	Dryer Flow Schematic	Dryer Valve	Dryer Flow Schematic	Dryer Valve
	Regeneration Closed Loop	Regeneration	Regeneration Heating is
	Cooling is Activated	Regeneration	Activated
	Cooling is Activated	Filter	Activated	Regeneration
				Filter
		Optional		Optional
		Regeneration		Regeneration
	Regeneration	Closed Loop	Regeneration	Closed Loop
	Regeneration	Cooler	Regeneration	Cooler
	Heaters	Cooler	Heaters	Cooler
	Heaters		Heaters
		Regenerarion		Regeneration
		Exhaust		Regeneration
		Exhaust		Exhaust
				Exhaust
		Optional		Optional
		Regeneration		Regeneration
		Closed Loop		Closed Loop
		Valve		Valve
	Left Desiccant		Left Desiccant

Large Dehumidifying Dryers

Functional Description

15

Image 15

Sterling SDA AP-1 specifications Options, Dewpoint Extend, Closed-Loop Regeneration

Contents

SDA Large AP-1 Control Dehumidifying Dryer If the Shipment is Not Complete Shipping InfoUnpacking and Inspection Event of Shipping Damage Returns Table of Contents Operation Troubleshooting Safety How to Use This ManualSafety Symbols Used in this Manual Dryer Safety Tags Description Responsibility General ResponsibilityOperator Responsibility Maintenance Responsibility Reporting a Safety Defect Functional Description Models Covered in This ManualGeneral Description Sequence of Operation Process/Regeneration Cycle Electrical Features Standard FeaturesAuto Start Timer Mechanical Features Options Dewpoint ExtendClosed-Loop Regeneration Drawings and Diagrams Optional dryer dust collector Aftercooler Design Specifications Process AftercoolerProcess Air Dust Collector Process Air Dust Collector Material Overdrying Protection Recommended Temperature Settings Mechanical Options Electrical OptionsController Options Fail Safe Operation Safety Devices and InterlocksSafety Circuit Standards Safety Device Lock-OutsPage Mechanical Options Denotes availability Dimensions and Specifications Denotes availability Denotes availability Making Electrical Connections Mechanical InstallationUncrating the Equipment Rigging and Placing Unit Description Making Gas Line Connections Gas-Fired Models Only Checking Blower Rotation Checking for Proper Blower Rotation Dryer/Drying Hopper Process Air Connections Making Dryer/Drying Hopper Process Air Connections Process Air Heater on Drying Hopper Large Dehumidifying Dryers Mechanical Installation Aftercooler Components & Flow Rates Connecting Aftercooler/Precooler Cooling Water Optional Drying Hopper Air Trap Using the Drying Hopper Air Trap Controller Description Controls Dryer Status Screen Startup Screen Process Air Temperature and Conveying Process Controller Dryer Alarms Help System LOG OFF Identifying Controller ScreensMain Menu Screen Setting Values Dryer Status Dryer Setup Over DRY Protect Alarms Auto Tune Dryer MenuAuto Start Main Menu Dryer Setup Screen 2 Dryer Setup Screen 3Dryer Setup Screen 4 Overdry Protection Overdry Protection Screen 1Overdry Protection Screen 2 Alarm History Screen AutotuneProcess AutoTune Screen Auto Start DEW Point SetupDew Point Setup Screen Autostart Timer Screen System Menu System Setup SET Clock Hour Meters Alarm History StatusHelp Menu Help Menu Screen System Backup Service Menu Main Menu System Setup System Setup ScreenLOW Level Detection Setup Autostart Clock Screen Clock Menu Screen Output Status Hour Meter ScreenInput Status Input Status Screen System Backup Screen ServiceService Menu Screen Alarm Screens Alarm Screen Example Redundant Safety Controller Display Always put your set point to 30F above set point Setting the Redundant Safety Controller Large Dehumidifying Dryers Controls Start-up Operation Using the Dryer Status Screen Alarm Descriptions Alarms Shutdown Maintenance Maintenance SchedulePhotocopy this page for your maintenance records Cleaning or Replacing the Process Air Filters Preventative Maintenance Calibrating the Dirty Filter Alarm Cleaning or Replacing the Regeneration Filter Checking the Dewpoint Control System Corrective Maintenance Symptoms of Worn Out DesiccantReplacing the Desiccant Replacing the Process Heater Electric Dryers Desiccant Tower Assembly Replacing the Regeneration Heater Electric Dryers Process Heater Box Assembly Regeneration Heater Box Assembly Troubleshooting Basic TroubleshootingIntroduction Large Dehumidifying Dryers Troubleshooting Determining Temperature Controller Errors or Sensor Errors Using a ThermocoupleUsing a Platinum Resistance Thermometer Credit Returns Warranty ReturnsAppendix Returned Material Policy Annex B Information Technical Specifications Spare Parts List Level 3 Mechanical Components Located on back of Dryer Dryer Identification Serial Number Tag Sales Department Service DepartmentTechnical Assistance Parts Department