Grain Systems PNEG-1181 - Manual (Page 67)

PNEG-1181 Portable Dryer Troubleshooting 67
11. Air Switch Tip
Network Series Air Switch Adjustment
1. With the Load Auger, Fan, Heater, and Unload switches in the OFF position, turn ON the Control
power then push the Dryer Power Start switch.
2. With power applied to the dryer, flip one of the fan switches to the ON position and watch for the
light to illuminate the fan switch knob. If the light illuminates when the fan reaches half its full speed,
then no adjustment is required. However, if the light does not illuminate until the fan is running at
full speed or the light does not illuminate at all and the dryer shuts down, then the air switch is
adjusted too high (skip to
step 3a ). If the light illuminates before the fan reaches half its full speed
the air switch is adjusted too low (skip to step 3b ).
3a. If the light illuminates after the fan reaches full speed or did not illuminate at all and the dryer shut
down then the air switch needs to be made more sensitive. Turn adjustment screw counter
clockwise (more sensitive). Make this adjustment on the air switch 1/4 turn at a time and each time
restart the fan and watch to see when the light illuminates.
3b. If the light illuminates before the fan reaches half its full speed then the air switch needs to be less
sensitive. Turn adjustment screw clockwise (less sensitive). Make this adjustment on the air switch
1/4 turn at a time and each time restart the fan and watch to see when the light illuminates.
4. Flip the fan switch to the OFF position and watch the light. It should go out when the fan is about
half its full speed. Adjust the air switch if necessary. Remember that less sensitive (clockwise
adjustment) will require a higher fan speed to close the air switch, and more sensitive (counter
clockwise adjustment), the switch can close at a slower fan speed.
Figure 11A
IMPORTANT: To adjust the air switch, the grain columns need to be full of grain so that the plenum can
build up air pressure and close the air switch.
Lower air switch
Upper air switch Air switch locations