Sterling STT70, STT40 manual Preventative Maintenance, Servicing Process Air Filters

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STT40 / STT70

5.2. Preventative Maintenance

This section describes maintenance procedures which will increase the longevity and efficiency of your dehumidifying dryer. Perform them at the regular intervals listed on the dryer checklist on the previous page.

5.2.1. Servicing Process Air Filters

Caution! Operating the dryer without the process air filter installed voids your warranty!

Dehumidifying dryers have a single cartridge canister-type filter in the process air loop. The filter protects blowers from plastic fines drawn in from the drying hopper and prevents the desiccant from being contaminated. Regular filter cleaning is essential to keep your dryer operating at peak efficiency.

You can blow or vacuum the dirt out of the filter with compressed air, but remember, it could become damaged from high-pressure blowing.

Set the “Timer” release switch to the position.

Recommendations for Cleaning and Replacing Filters

•Remove the threaded fastener securing the filter access cover, then remove the cover.

•Remove the nut on the center retaining rod to remove the filter cartridge.

/Wait until the blower has stopped.

The blower will continue running for 10 minutes once the dryer is turned off.

If there is a return air cooler installed, switch off the coolant circuit.

/Switch off the dryer’s main power switch (the “power” signal lamp turns off).

Interrupt the main power supply so that the device cannot be turned on unintentionally.

Clogged filters substantially reduce the amount of circulating air and lead to a production lag of your dryer. Clogged filters may also damage the heating elements.

Maintenance 5-4

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Contents Operation Instructions Dehumidified air dryer STT40 STT70STT40 / STT70 STT40 / STT70 Table of contents 10-5 General Information STT40 / STT70 Field of application Explanations and informationLegal basis Safety instructions General Assembly OperationMaintenance For the safety of the device Start up Switching on the Dryer Initial OperationPower signal lamp turns off Continuous Operation Switching the Dryer onFor operation with the optional timer clock Setting the Drying Temperature Autotuning the temperature controller Switching the Dryer off Error and error correction Hopper heater Following errors can cause an alarm BlowerRegeneration heater Maintenance STT40 / STT70 Maintenance schedule System model # Serial # Every weekServicing Process Air Filters Preventative MaintenanceRecommendations for Cleaning and Replacing Filters Cleaning or Replacing the Return Air Filter STT40 / STT70Servicing the Dew Point Monitor Corrective Maintenance Symptoms of Worn DesiccantReplacing Worn Desiccant Remove Hose ClampsDisposing of Drying Agents Required Desiccant AmountsRemove Clamp Process Heater Procedures Replacing the Process HeaterReplacing/Cleaning the Cooling Coils Cooling Coil LocationReplacing the regeneration heating coil Heating CoilCleaning the Drying Hopper STT STT 60Functional description General Information ➅ ➄ Read the timer clock operating manual Drying Hopper Optional Drying HopperTemperature controller Hopper HeaterDefault Settings for Jumo TEMP. Controller Contact informationConnection to a Pneumatic Conveying System Optional Return Air Cooler OptionalTransporting, Assembly and Storage Transporting and Packing Assembly StorageAssembly instructions Grounding the equipment against electrostatic charging Grounding the equipmentElectrical Connection Connection of Return Air Cooler Optional STT70Troubleshooting IntroductionSTT40 / STT70 Check resin manufacturer’s data Using a Platinum Resistance Thermometer Determining Temperature Controller Errors or Sensor ErrorsUsing a Thermocouple STT70 Technical dataSTT40 Return Air Cooler optionalDimension Sheet Spare parts list STT40 Pos ID-number DescriptionSTT70 Operating unit Pos ID-number Description Control unit STT40 Control unit STT70Electrical manual Accessories Parameter Parameter set Basic temperature controller settings STT40Code Basic temperature controller settings STT70 Quick Start Guides For STT 40 DryerPosition O On without timerOn with timer Arrow up Set PointArrow down Process Display LED Status LED Ramp/Program Page Proper Shut-down Guide for STT 40 Dryer Heater Connection Thermocouple Main power High Temp SafetyQuick Start Guide for STT 70 Dryer Exit Page Proper Shut-down Guide for STT 40 Dryer Parts Department

STT40, STT70 specifications

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