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Chapter 4: Operation
4-1 Start-up
1. Turn on (energize) the disconnect switch in your power drop, and then turn on the one on the
dryer.
2. Turn the system
ON/OFF switch to ON to energize the display panel.
3. Close the slide gate at the bottom of the drying hopper.
Make sure that the blowers turn in the right direction.
4. Fill the drying hopper with material.
5. Turn the dryer
ON switch to START to start the dryer.
The process blower starts.
6. If your dryer has a water-cooled aftercooler, make sure that sufficient cooling water (3gpm at
85°F or lower) flows properly through the coil and that you have bled any trapped air from the
system. Make sure the aftercooler has the proper supply water temperature.
7. Set the process set point on the temperature controller.
8. After the proper pre-drying time for the initial hopper fill has elapsed, fully open the drying
hopper slide gate.
9. Turn on the machine convey ON/OFF switch to ON, and set the convey timer for the proper
conveying time.
Note: To allow proper residence time during continuous processing,
maintain the material level in the hopper at the midpoint of the air trap
assembly.
4-2 Controller Description and Operation
Identifying Control Panel Indicator Lights and Switches for the Standard
Controller
Switches
System OFF/ON/START Switch. This switch energizes or de-energizes control power to
the indicator panel and starts the dryer. (The controller can be energized without the dryer
running.)
Optional Alarm Silence Switch. Press this switch to silence the horn when a high
temperature process/regeneration or blower failure alarm activates.
Indicator Lights
Alarm Light. This feature works in conjunction with the alarm horn to warn the operator of
a high bed safety temperature, a regeneration heater fault, or a blower failure. This warning
is reset by pressing the alarm silence button.
Figure 4: Typical Dryer Control Panel (shown with the optional dew point monitor).
Dehumidifying Dryers Chapter 4: Operation 19 of 53