Grain Systems PNEG-584 - Manual (Page 19)

19
SERIES TWO HEATER
PROGRAMMING SET POINTS
multiple heaters may be done at any
heater control console. The infor-
mation programmed is automatically
transmitted to all other heaters when
the programming is complete.
Hi Limit Set Point--The upper
left cursor is flashing indicating the
mode. If the plenum temperature
increases above this point, the flame
is shut off--"OFF-CYCLE" is dis-
played on screen.
Cycle Set Point--The upper 2nd
from left cursor is flashing indicat-
Depressing the "PROGRAM" switch (lower left) causes
the display to enter the program mode. Each item below
is programmed by using the up and down arrow switches.
Holding down these up and down arrow switches for
about 2 seconds will cause the numbers to increase/de-
crease rapidly until the switch is released. When fin-
ished programming an item, depressing the "PROGRAM"
switch again will cause the new setting to be entered into
memory, and the display will advance to the next func-
The limits are continuously checked during the dry-
ing operation. A limit switch open or any other error
condition will cause the dryer to shut down, and the fan
will be shutdown. If a limit opens, or an error condi-
tion occurs during drying, the control will lockup in
the error display mode. Power must be shut off and
back on to the control to clear the error condition--
even if the error or limit that caused the shutdown
has been corrected. This is to keep the display locked up
with the condition that caused the error, allowing the opera-
tor time to determine what caused the shutdown.
above this point the dryer operates normally--flame on
and off at the high limit and cycle set points. If the hu-
midity is below this point the dryer goes into the "OFF-
CYCLE" mode. Note: At this time a true humidity
sensor has not been introduced. To use this option,
set the humidity setting to 50% and use a humidistat
switch. When the humidity is high the switch is closed,
indicating high humidity. At this setting, the dryer runs
normally.
Temperature Differential--The upper right cursor is
flashing indicating the mode. If the flame shuts off because
the temperature is greater than the high limit set point, the
temperature must fall below the (Set Point minus Tempera-
ture Differential) for the flame to come back on.
Programming the high-limit set point.
HEATER OPOERATION PROCEDURE
tion to be programmed.
Programming may be done at
anytime (unless an error condi-
tion exists) even while the dryer
is in operation.
Programming a system with
ing the mode. If the dryer is not a hi-lo dryer, this
function is skipped. If the plenum temperature increases
above this point, the flame reduces to "LO-FLAME".
Humidity Set Point--The upper 2nd from right cur-
sor is flashing indicating the mode. If the humidity is