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Sterling STT40, STT70 manual Connection of Return Air Cooler Optional

Models: STT40 STT70

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STT40 / STT70

8.4. Connection of Return Air Cooler (Optional)

)A return air cooler must be used if the return air temperature is higher than 149°F (+65 °C).

You can connect the return air cooler to a coolant circuit or to the water main network. The water flow rate in the water main network* is for:

STT40	approx. 7.16 ft3 (0.2 m3/h),
STT70	approx. 14.13 ft3 (0.4 m3/h)

(*water temperature:42.8°F) (+6 °C) Rate your coolant circuit accordingly.

Connect the coolant in- and outlets to the return air cooler. Observe the flowing direction of the coolant.

Check the tightness of the connections. Connections are made with ½” NPT.

Figure 15: Connection of Return Air Cooler STT40 (A) / STT70 (B)

Assembly instructions 8-4

Page 51

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Sterling STT40, STT70 manual Connection of Return Air Cooler Optional

Contents

Operation Instructions Dehumidified air dryer STT40 STT70Sterling Material Processing Telephone Technical service Service departmentSterling Material Processing 5200 West Clinton Ave Milwaukee, WISTT40 / STT70 Table of contents STT40 / STT70 1.1. Warnings and symbols 1. General InformationCaution High noise pollution 1.5. Notes on Usage 1.2. Explanations and information1.3. Legal basis 1.4. Field of application2. 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 off3.2. Continuous Operation 3.2.1. Switching the Dryer onFor operation with the optional timer clock For operation without timer clock3.2.2. Setting the Drying Temperature Press the “EXIT” key Autotuning the temperature controllerIf “tunE” stops flashing, Autotuning is finished Press the “EXIT” key for at least 2 seconds3.3. 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 Hopper heater The following errors can cause an alarm BlowerRegeneration heater Regeneration heater5. Maintenance Please observe the maintenance schedule Serial # 5.1. Maintenance schedulePhotocopythis page for your maintenance records System model #5.2.1. Servicing Process Air Filters 5.2. Preventative Maintenancewhen operating with return air cooler ID Figure 1 Air Filter Location & DisassemblyDO NOT clean/wash filter with water when operating without 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 Remove Hose Clamps Remove Clamp Figure 2 Desiccant Bed Location and Disassembly5.3.2. Replacing Worn Desiccant DESICCANT BEDS ARE HOT DURING OPERATIONFigure 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 Heating Coil Figure 6 Heating Coil Location and Disassembly5.5.2. Replacing the regeneration heating coil Hazardous electrical current present5.6. 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 controllerContact information DEFAULT SETTINGS FOR JUMO TEMP. CONTROLLERPARAMETERS THAT ARE CHANGED IN TESTING AREA PARAMETERS THAT ARE NOT CHANGED FACTORY DEFAULTSFigure 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 STT70 16 A 8.3. Electrical ConnectionSTT40 max. 1.1 kW, STT70 max. 2.0 kW The fuse protection must have STT40 16 A8.4. Connection of Return Air Cooler Optional Possible cause 9. TroubleshootingProblem 9.1. IntroductionCorrective action ProblemProcess heaters are faulty Possible causeProblem Possible causeCorrective action Possible cause Using a ThermocoupleUsing a Platinum Resistance Thermometer ProblemReturn Air Cooler optional 10. Technical data10.1. STT40 10.2. STT7010.3. Dimension Sheet 11. Spare parts list Spare parts listSTT40 / STT70 Return air cooler optional STT40ID-number DescriptionReturn air cooler optional STT70ID-number DescriptionOperating unit ID-numberDescription Hopper heater Control unit STT40Hopper heater Control unit STT7012. Electrical manual STT40 / STT70Electrical manual 13. Accessories AccessoriesSTT40 / STT70 Parameter set Basic temperature controller settings STT40Code ParameterParameter set Basic temperature controller settings STT70Code Parameter14.1. for STT 40 Dryer 14. Quick Start GuidesPosition “O” Position “I” On without timerOFF On with timer 5.Turn the hopper heater switch to position “I”Note Due to the following circumstances Set Point PGM Arrow downProcess Display LED “Status” LED Ramp/Program EXIT Arrow upPage Position “O” Position “I” OFF 14.2.Proper Shut-downGuide for STT 40 Dryer14.3. Quick Start Guide for STT 70 Dryer On without timerOFF On with timer Main power High Temp SafetyProcess Display LED “Status” LED Ramp/Program EXITPosition “O” Position “I” Set Point PGM Arrow downinitial dryer start-up Note Due to the following circumstancesPosition “O” Position “I” OFF 14.4. Proper Shut-downGuide for STT 40 DryerContract Department Service DepartmentParts Department Sales Department