Grain Systems PNEG-526 - Manual (Page 15)

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Tower Dryer Operations & Service DRYER START UP
11. Start the burner by turning the BURNER
selector switch to the "ON" position. The dryer
automatically goes through a 30 second purge
period once the blowers are started. The amount
of time remaining on the purge cycle will be
displayed on the LCD display screen. After the
purge period the burner pilot will automatically
light. Once the flame control circuit on the dryer
senses flame, the light in the BURNER selector
switch will illuminate. If the pilot fails to light in 15
seconds the burner will lock out and must be
restarted by turning the BURNER switch "OFF"
then back "ON".
12. Cock and open the Maxon valves. After the
pilot is ignited, the main burner can be lit by
cocking and opening the two Maxon gas shutoff
valves. These valves will automatically open on
dryers equipped with motorized Maxon Valves.
The main burner will light and the dryer's plenum
temperature will be automatically controlled by
the modulating motor and maintained at the
selected temperature.
12.1 Open firing valve (Canadian dryers only)
13. Let plenum come up to temperature and
begin drying. Depending upon ambient condi-
tions, the dryer may take 10 minutes or more to
reach the drying temperature.
14. Start unload system. Before discharging grain
from the dryer, first make sure all dry legs and con-
veyors are operating ahead of the dryer. Turn the
UNLOAD CONVEYOR selector switch to the
"ON" position to operate the dry grain conveyor
leading from the dryer. Turn the METERING DE-
VICE selector switch to the "FORWARD" position
15. Set Unload Rate/Moisture Control Tem-
perature manually. While operating the dryer in
manual mode, set the unload rate by touching the
U.L. Rate box on the LCD display. On the pop-
up keypad, enter the new unload rate and press
return.
16. Check discharge moisture content after 10
minutes. Take five small samples from the dis-
charge and mix before taking a moisture reading.
17. Switch over to Automatic Moisture Control.
When the discharge moisture content has stabi-
lized at the desired amount for 20 to 30 minutes,
the dryer may be switched over to Automatic
Moisture Control.
17.1 Press the MOISTURE CONTROL button at
the bottom of the LCD screen.
17.2 On the Moisture Control Setup screen, set the
upper and lower limits by touching the corre-
sponding box and using the pop-up keypad.
These values prevent the unload from moving too
fast or too slow should the incoming moisture be
significantly greater or less than anticipated.
17.3 Press the CONTROL MODE box to toggle
between Manual and Automatic moisture control.
The metering device will not run unless the un-
load conveyor is also running.
If the discharge moisture content is consis-
tently too high or too low, adjust the target grain
temperature as follows:
5 o F increase = 1 moisture point decrease
5 o F decrease = 1 moisture point increase
Allow 30 minutes between adjustments.
Note that the current and target grain tempertures
are displayed next to the Temperature History
Chart.
to start discharging grain from the dryer.
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