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Sterling STT40, STT70 Replacing/Cleaning the Cooling Coils, Hazardous electrical current present

Models: STT40 STT70

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5.5.1.Replacing/Cleaning the Cooling Coils

STT40 / STT70

7.Re-clamp process heater assembly onto the drying hopper.

8.Reattach wiring according to the sketch that was made previously.

9.Replace the air hose to the process heater.

10.Replace access cover on junction box of process heater assembly.

5.5.1.Replacing/Cleaning the Cooling Coils

•Hazardous electrical current present.

Disconnect and lock out power before you replace cooling coil!

Figure 5: Cooling Coil Location and Disassembly

Cooling Coil

Location

1.In order to gain access to the cooling coil, the cover plate on the side of the dryer must be removed.

2.Remove cooler from the cooler housing.

3.To clean the cooling coil, use compressed air or a steam cleaner to blow the dust off or clean any oily residue on the coil.

4.Re-install the cooler in reverse order. Install new gaskets and securely tighten all fasteners.

5.Secure the access cover on the side of the dryer.

Maintenance 5-11

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Sterling STT40, STT70 manual Replacing/Cleaning the Cooling Coils, Hazardous electrical current present

Contents

Operation Instructions Dehumidified air dryer STT40 STT70Sterling Material Processing Sterling Material Processing Technical service Service department5200 West Clinton Ave Milwaukee, WI TelephoneSTT40 / STT70 Table of contents STT40 / STT70 1.1. Warnings and symbols 1. General InformationCaution High noise pollution 1.3. Legal basis 1.2. Explanations and information1.4. Field of application 1.5. Notes on Usage2. Safety instructions Safety instructionsSTT40 / STT70 2.1 General 2.1.2. Operation 2.1.1. Assembly2.1.3. Maintenance 2.2. For the safety of the device 3. Start up STT40 / STT70Start up 3.1. Initial Operation 3.1.1. Switching on the DryerWait until the blower has stopped The “power” signal lamp turns offFor operation with the optional timer clock 3.2.1. Switching the Dryer onFor operation without timer clock 3.2. Continuous Operation3.2.2. Setting the Drying Temperature If “tunE” stops flashing, Autotuning is finished Autotuning the temperature controllerPress the “EXIT” key for at least 2 seconds Press the “EXIT” key3.3. Switching the Dryer off The “power” signal lamp turns offWait until the blower has stopped 4. Error and error correction Error and error correctionSTT40 / STT70 Regeneration heater The following errors can cause an alarm BlowerRegeneration heater Hopper heater5. Maintenance Please observe the maintenance schedule Photocopythis page for your maintenance records 5.1. Maintenance scheduleSystem model # Serial #5.2.1. Servicing Process Air Filters 5.2. Preventative MaintenanceDO NOT clean/wash filter with water Figure 1 Air Filter Location & Disassemblywhen operating without return air cooler ID when operating with return air cooler IDThe sensor will be destroyed 5.2.3. Servicing the Dew Point Monitor5.3. Corrective Maintenance 5.3.1. Symptoms of Worn DesiccantFIRST AID 5.3.2. Replacing Worn Desiccant Figure 2 Desiccant Bed Location and DisassemblyDESICCANT BEDS ARE HOT DURING OPERATION Remove Hose Clamps Remove ClampFigure 3 Required Desiccant Amounts 5.4. Disposing of Drying Agents5.5. Replacing the Process Heater Figure 4 Process Heater Location and Disassembly5.5.1.Replacing/Cleaning the Cooling Coils Figure 5 Cooling Coil Location and DisassemblyHazardous electrical current present 5.5.2. Replacing the regeneration heating coil Figure 6 Heating Coil Location and DisassemblyHazardous electrical current present Heating Coil5.6. Cleaning the Drying Hopper Figure 7 STT Figure 8 STT 60 - STTSTT 6. Functional description STT40 / STT70Functional description The dryer is rated for continuous operation 6.1. General Information➅➄ ➃ Figure 9 Functional diagram of STT40 / STT70Figure 10 Operating unit Read the timer clock operating manualFigure 11 Drying Hopper 6.2. Drying Hopper Optional6.2.1. Hopper Heater Figure 12 Temperature controllerPARAMETERS THAT ARE CHANGED IN TESTING AREA DEFAULT SETTINGS FOR JUMO TEMP. CONTROLLERPARAMETERS THAT ARE NOT CHANGED FACTORY DEFAULTS Contact informationFigure 13 Suction Box 6.4. Return Air Cooler Optional7. Transporting, Assembly and Storage Transporting, Assembly and StorageSTT40 / STT70 7.1. Transporting and Packing 7.3. Storage 7.2. Assembly8. Assembly instructions 8.1.Installation of the exhaust fan for regeneration of exhaust STT40 max. 1.1 kW, STT70 max. 2.0 kW 8.3. Electrical ConnectionThe fuse protection must have STT40 16 A STT70 16 A8.4. Connection of Return Air Cooler Optional Problem 9. Troubleshooting9.1. Introduction Possible causeProcess heaters are faulty ProblemPossible cause Corrective actionProblem Possible causeCorrective action Using a Platinum Resistance Thermometer Using a ThermocoupleProblem Possible cause10.1. STT40 10. Technical data10.2. STT70 Return Air Cooler optional10.3. Dimension Sheet 11. Spare parts list Spare parts listSTT40 / STT70 ID-number STT40Description Return air cooler optionalID-number STT70Description Return air cooler optionalOperating unit ID-numberDescription Hopper heater Control unit STT40Control unit STT70 Hopper heater12. Electrical manual STT40 / STT70Electrical manual 13. Accessories AccessoriesSTT40 / STT70 Code Basic temperature controller settings STT40Parameter Parameter setCode Basic temperature controller settings STT70Parameter Parameter set14.1. for STT 40 Dryer 14. Quick Start GuidesOFF On with timer On without timer5.Turn the hopper heater switch to position “I” Position “O” Position “I”Process Display LED “Status” LED Ramp/Program Set Point PGM Arrow downEXIT Arrow up Note Due to the following circumstancesPage Position “O” Position “I” OFF 14.2.Proper Shut-downGuide for STT 40 DryerOFF On with timer On without timerMain power High Temp Safety 14.3. Quick Start Guide for STT 70 DryerPosition “O” Position “I” EXITSet Point PGM Arrow down Process Display LED “Status” LED Ramp/Programinitial dryer start-up Note Due to the following circumstancesPosition “O” Position “I” OFF 14.4. Proper Shut-downGuide for STT 40 DryerParts Department Service DepartmentSales Department Contract Department