Grain Systems PNEG-1820 - Manual (Page 30)

30 PNEG-1820 CE Compliant Top Dry Series 2000 Autoflow
12. Autoflow Theory
Top Dry Autoflow Theory of Operation
Control Panel Switch Status
• Control power: “ON”
• Moisture control thermostat: “ON”
• Aeration fan: “AUTO”
• Load auger: “AUTO”
• Fan: “AUTO”
• Heater: “AUTO”
• Dump: “AUTO”
• Dry and hold: “OFF”
Emergency Stop Switch Status
• Autoflow control box emergency stop: “pulled out”
• Fill system control box emergency stop: “pulled out”
• Actuator control box 24V switch: “ON”
• Aeration fan bypass: “enabled”
With no grain in the drying chamber and wet grain in the wet storage tank, fill system #1 and fill system #2
(if fitted) will start.
When grain reaches the Drying Chamber Low Level switch, the aeration fan and the master drying fan
will start.
After the fan delay time the slave drying fan (if fitted) will start, the air switch will close and the dry timer
will start to count down.
After a 20 seconds purge delay, the fan/heater unit(s) will ignite.
When the plenum temperature reaches the cycle set point, the fan/heater unit(s) will cycle to low-fire.
The fan/heater units will continue to cycle throughout the drying process.
When grain reaches the Chamber High Level switch, the fill #2 delay will begin to count down.
When the fill #2 delay reaches zero, fill system #2 will shut off and the fill #1 delay will begin to count down.
When the fill #1 delay reaches zero fill system #1 will shut off.
If the grain drops below the High Level switch, the fill system(s) will start and refill the drying chamber.
When the dry timer reaches zero, if the grain temperature is below set point, the dryer will go into
temperature hold.
When the grain temperature reaches set point, the unit will continue to the dump cycle.
In the dump cycle, the grain is dumped into the storage chamber.
When the dump timer reaches zero, the dump chutes raise.