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STT40 / STT70
Maintenance 5-10
5.5. Replacing the Process Heater
The dehumidifying dryers utilize a thru-phase Calrod-type heater element. This heater element is
mounted to the inlet of the drying hopper. Although the replacement procedure is the same for
each heater, the wattage varies by model, voltage, temperature range, etc.
• Hazardous electrical current present.
Disconnect and lock out power before you replace heater
elements!
Figure 4: Process Heater Location and Disassembly
Procedures
1. Remove access cover from the junction box located on the bottom of the
heater.
2. Remove the wiring from all terminals that are inside the junction box. (Note:
Sketch all wiring locations so that you can properly re-install later.)
3. Remove the clamp that is attaches the process heater to the hopper. Also,
remove the hose from the heater.
4. Place the process heater assembly on a workbench to begin disassembly.
5. Carefully unscrew heater/junction box subassembly from the process heater
housing. (You must replace both the process heater element and the
junction box.)
6. Replace with new heater element/junction box subassembly.
• Heater loops should not touch each other.
“Hot spots” lead to premature heater failure!
Process Heater
Remove Clamp