Sterlco SHA Series Hot Air Dryer - Manual (Page 14)

Hot Air Dryers Chapter 5: Maintenance 14 of 17
faceplate panel. High alarm adjustment for the West controller is located on
the upper left hand corner on the inside of the faceplate.
4. Quickly lower the process temperature set point by the number of degrees of
separation you want. (Example: 25˚, from 200˚ to 175˚)
5. Turn the safety set point separation adjustment until the second pilot light on
the controller changes state. The second pilot light will illuminate just below
the safety set point.
5-5 Replacing the Heater Element
The best quality industrial heaters are used in the air heater compartment. Because most
dryers are working 24 hours a day, everyday that your processing machines are operating,
these heaters may need occasional replacement.
1. Disconnect the electrical power source.
2. Remove guards from unit.
3. Remove the heater cover, exposing both the heater bank and the terminals of
the heaters. Note the location of lead and jumper wires.
4. Remove the four bolts on each heater element in the 60, 150, 225 and 450
models. Remove the six bolts on the 1000-1500 model assembly, which
includes 3 elements, and remove.
5. Check each heater element individually with an ohmmeter to determine
which element burned out.
6. When replacing heater elements, make sure gaskets are good. If gaskets are
damaged, replace immediately. Rewire the elements, making sure jumpers
are in their correct position. The 60, 150, 225 and 450 models are wired in
the parallel wye. The 1000-2500 models is wired in parallel delta.
Note: Make sure the individual heater element loops are not touching. This will
cause a hot spot on the heater and lead to premature heater failure!