5. Dryer Pre-Start Checks
Metering Roll Operation
To check the metering roll operation, turn high speed knob clockwise. The metering roll speed should increase. Turning the knob counterclockwise will decrease the speed. Turn ON the MOISTURE CONTROL switch. If the Grain Temperature Setpoint is set above the outside temperature, the system will switch to Low Speed if working correctly. Make sure the drive chain tension is properly adjusted and all sections of the metering rolls rotate. Turn the unload switch OFF after these checks are complete. The bottom auger will continue to run for 30 seconds after the switch is turned OFF to allow for
Figure 5B The Metering Roll Access Area
Fan Switch
Bump the FAN switch and observe the fan rotation. The fan should run counterclockwise. Sometimes on three phase models all motors on the dryer will run backwards. They can easily be reversed by interchanging two of three power supply wires. Reverse the two outside wires, L1 and L3 and leave the middle one in the same position.
NOTE: If the dryer is empty, the burner does not operate. The fans cannot create enough static pressure to engage the air switch. You will receive a “no airflow” message. To start the dryer when it is low on grain, the airflow switches must be turned OFF. Switching Dip Switch number eight (#8), on the back of the computer control board, to ON turns the Air Switch OFF.
Dip switch number eight (#8) must be turned back to the OFF position after this test is complete or no air testing will occur.
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