Grain Systems PNEG-728 - Manual (Page 32)

Autoflow Operation
32
in the “on” position. Place the aeration fan switch
on the Autoflow control box in the “on” position.
Go to the master fan and heater unit. Place the fan
service switch in the “on “ position. The master
fan should start. In two fan, units the slave fan
should start after the fan delay. In single fan units
the light on the master fan service switch should
light up after the master fan reaches half speed. If
the service switch light lights up before the fan
reaches half speed, adjust the airswitch by turning
it clockwise. If the service switch light does not
light up, adjust the airswitch by turning it counter-
clockwise. In two fan units, the light on the master
fan service switch should light up after the slave
fan reaches half speed. If the service switch light
lights up before the fan reaches half speed, adjust
the airswitch by turning it clockwise. If the ser-
vice switch light does not light up, adjust the
airswitch by turning it counterclockwise.
Burner Test Fire
Make sure the heater service switch on the
main drying fan(s) is in the “off” position. Place
the heater switch on the Autoflow control box in
the “on” position. Start the main drying fan(s), if
they are not already running. Make sure the fuel
supply is on. Go to the fan and heater unit(s) and
place the heater service switch in the “on” posi-
tion. The burner should ignite after a short purge
delay. Gas pressure should be shown on the
gauge. Adjust the high fire gas pressure by turning
the regulator in and out on LP units; or, by open-
ing and closing the main ball valve on natural gas
units. The high fire pressure should be approxi-
mately 6-15 lbs. for LP units and 6-10 lbs. for
natural gas units. At this time adjust the Hi-Lo
thermostat all the way to the right. Watch the
thermometers. When the temperature in dryer gets
to the desired setpoint (160°-180°), turn the knob
back to the left until the heater cycles from high
fire to low fire. While the heater is in low fire,
adjust the low fire gas pressure by opening or
closing the valve located on top of the pipetrain.
The low fire gas pressure should be approximately
2-6 lbs. for LP units and 1-3 lbs. for natural gas
units. If the burner remains in low fire and does
not cycle, slightly decrease the gas pressure at the
low fire gas valve. Any time the high fire gas
pressure is adjusted, the low fire gas pressure
needs to be checked. The basic rule-of-thumb for
setting gas pressure is as follows: make sure that
the temperature in the bin is increasing at a rapid
rate when in high fire, and the temperature in the
bin is falling at a rapid rate while in the low fire.
Dryer Shutdown
To shut down the dryer, first close the fuel
supply valve at the tank or the valve along the fuel
supply line. If the burner is operating, let the dryer
run out of fuel. It should shut down due to loss of
flame. Press the dryer stop button to clear the
error, and turn off the main power disconnect at
the entrance panel.
Emergency
In case of an emergency push the emer-
gency stop switch located on the side of the
Autoflow control box. This will shut everything,
that is controlled by the dryer, off immediately.
FILL SYSTEM CONTROL BOX