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350-2100 cfm Dryers Chapter 5: Startup, Shutdown & Operation 28 of 58
6. If the dryer has an aftercooler, make sure there is proper flow of cooling water flow through the
coil, and any trapped air has been bled from the system.
7. Make sure the damper on the hopper air inlet tube is about 50% open.
8. Remove the lower end of the 2½" flex hose from the tube stub on the lower drying hopper.
Carefully adjust the damper valve on the return line back to the filter to achieve approximately
200 cfm air flow out of the flex hose.
9. Set the process setpoint on the temperature controller.
10. After the proper pre-drying time for the initial hopper fill has elapsed, fully open the drying
hopper slidegate.
To allow proper residence time during continuous processing, the material level in the hopper should be
maintained at the midpoint of the air trap assembly.
5-3 Shutdown
• Turn off the conveying system supplying the drying hopper.
• When processing is complete, close the hopper slide gate and shut down any in-line
companion equipment, i.e. an aftercooler.
• Push the Start/Stop button. After both blowers have shut down and regeneration is
complete, turn the On/Off selector switch "OFF".
• Empty the drying hopper, if desired.
• For maintenance or long-term shut down, open (de-energize) the electrical disconnects at
the dryer and in the power drop.
5-4 Setting the Process Air Temperature
To Change Process Air Temperature Set Point:
• Press
to raise the Setpoint.
• Press
to lower the Setpoint.
5-5 Setting the High and Low Temperature Alarms
To Change the Process Air High Temperature Alarm Setting:
1. Press
for at least two seconds to access the level 1 parameters.
2. When the PV LED display shows
, use and to set the desired high
temperature alarm value.
The high temperature alarm value is a deviation of the process air temperature set point. The alarm
value will track the set temperature. If the high temperature alarm is set to "25", a high temperature
alarm occurs if the process air temperature rises more than 25°F above the process air temperature
setpoint.
3. Press
until the PV LED shows . Use and to set the desired low
temperature alarm value.