Grain Systems PNEG-728 - Manual (Page 39)

39
Autoflow Operation
TERMINOLOGY
Linear Actuator-The linear actuator is attached to
the cable that controls the dump chutes. When the
dryer enters into the dump cycle the linear actuator
extends giving slack to the dump chute cable.
When slack is given to the dump chute cable the
dump chutes open dumping grain from the drying
chamber into the storage chamber. The linear
actuator is located in the actuator control box.
Load Delay-The load delay is not used in single
fill systems. The load delay is located on the dryer
control panel next to the display screen. The load
delay controls how long fill system #2 runs after
grain has reached the chamber high level rotary
switch in units with two fill systems.
Low-Fire-Low-fire is the state the burner is in
when the plenum temperature meets or exceeds the
cycle setpoint on the hi-lo thermostat. When the
unit is in low-fire the plenum temperature should
be declining. When the unit is in low-fire the gas
pressure should be set around 5 lbs. for liquid
propane and 2 lbs. for natural gas. The gas pres-
sure required to make the temperature fall in the
plenum may vary with ambient air conditions.
Master Drying Fan-The master drying fan is
located on the fan platform just beneath the drying
chamber on the outside of the bin and is used to
force heated air through the grain to dry it. The
master drying fan is the only fan and heater in a
single fan unit. In two fan units the master drying
fan is the fan and heater with airswitch and hi-lo
thermostat.
Moisture Control Thermostat-The moisture
control thermostat is located on the dryer control
panel. The moisture control thermostat uses four
temperature sensors located in the drying chamber
to sense the grain temperature. The grain tempera-
ture setpoint is set on the moisture control thermo-
stat.
Out of Grain Timer-The value set on the out of
grain timer is the amount of time that grain has to
reach the drying chamber low level rotary switch
when the dryer is refilling after the dump cycle in
an Autobatch system. When the dump cycle is
complete the out of grain timer begins to count
down. If grain does not reach the drying chamber
low level switch before the out of grain timer
reaches zero the dryer will give an out of grain
error and shut down. The out of grain timer is not
used in an Autoflow system. The out of grain
timer is located on the dryer control panel next to
the display.
Plenum Temperature-The plenum temperature
is the temperature of the air coming out of the fan
and heater unit(s) that is being forced through the
grain in the drying chamber. The plenum tem-
perature is sensed by the hi-lo thermostat.
Purge Delay-The purge delay is a built-in delay
used to prevent the ignition of the burner with
raw gas in the bin. After proof of airflow has
been established the computer starts counting
down the purge delay to allow the fans to dis-
perse any gases that may have accumulated in the
bin before igniting. When the purge delay
reaches zero the burner ignites and the drying
begins. The purge delay is not set by the user.
Slave Drying Fan-The slave drying fan is not
present in single fan units. In two fan units the
slave drying fan is the fan and heater without the
airswitch and hi-lo thermostat.
Storage Chamber-The storage chamber is the
chamber where grain is cooled and stored. Hot
dry grain is dumped from the drying chamber into
the storage chamber during the dump cycle. A
rotary switch warns the computer when the
storage chamber is full.
Storage Chamber High Level Rotary Switch-
continued to page 40