Grain Systems PNEG-900 - Manual (Page 27)

3. Installation
PNEG-900 Series 2000 Autoflow Fan/Heater and Control Installation Instructions 27
Drying Chamber Rotary Switches Mounted in Bin Roof
The three (3) Drying Chamber rotary switches are used by the Series 2000 Autoflow to monitor the
location of grain in the drying chamber. The rotary switch with the shortest shaft extension is the Drying
Chamber Overflow Rotary switch. It is used as a safety in the event the Chamber High-Level Rotary switch
fails. The rotary switch with the longest extension is the Drying Chamber Low-Level Rotary switch. It is
used to inform the computer when the peak has been covered with grain so the drying process can begin;
and, will shut down if the drying chamber empties unexpectedly. The third rotary switch is the Drying
Chamber High-Level Rotary switch. It is used to inform the dryer when the drying chamber is full so loading
can stop.
When mounting the Drying Chamber Rotary switches some foresight is needed. The Drying Chamber
Rotary switches should be located in close proximity to one another to lessen the amount of conduit and
wiring required. The rotary switches should also be mounted so that they are located in an area of the
drying chamber that fills evenly with the rest of the drying chamber. The component placement
on Page 11
shows the placement of the Drying Chamber Rotary switches in relation to the fill system #1 transport
auger/downspout.
The rotary switches should NOT be located in a part of the drying chamber that fills unevenly with the rest
of the drying chamber. If the area of the drying chamber where the rotary switches are located fills faster
that the rest of the drying chamber the drying chamber will not fill to capacity and uneven drying will result.
If the area of the drying chamber where the rotary switches are located fills slower than the rest of the
drying chamber an overflow situation may occur.
It is very critical that the drying chamber fill evenly and that the grain falls from fill system #1 directly onto
the perforated cone in the drying chamber.
Figure 3Q