Grain Systems PNEG-743 - Manual (Page 9)

10
Series 2000 Top Dry Heater Control
OPERATING PROCEDURE
shut down, and then the fan will shutdown. If a
limit opens or an error condition occurs during dry-
ing, the control will lockup in the error display
mode. Power must be shut off and back on to clear
the error condition, even when the error or limit that
caused the shut down has been corrected.
The main display shows either dry run time
(lower left cursor), cool down time (lower 2nd
from left cursor), plenum (lower 2nd from right
cursor) or grain temperature (lower right cursor).
The "mode select" (fan bypass) is used to select
the mode to be displayed. Note, that the cursors
do not flash when in the normal display. They do
flash when in the program mode (see page 18).
The dry and cool down shown on the display is
the amount of time remaining in the dry or cool pe-
riod. Note, that if unit is in the dry time period,
you cannot view the cool time remaining, since the
unit is not in the cool period. However, the cool
period may be altered or viewed by entering the pro-
gram mode. The same is true if the heater control is
in the cool period. You cannot view the dry run time,
since that time has already expired.
20. Increase the cycle set point to return to high flame.
21. Turn off fan/heater by placing the toggle switch in
the "OFF" position.
22. Repeat process on second fan/heater if appli-
cable.
23. Watch heater run several minutes to make sure
it cycles between hi and lo flame properly.
24. Hi-flame pressure should be adjusted so plenum
reaches cycling temperature easily.
25. Lo-flame should be adjusted so temperature
drops slowly, until switching back to high flame.
Running The Dryer
Run Hours Display
Run hours are recorded when the controller detects
that the fan is on (airflow). The hours may be viewed
by depressing the "HOURS" to get hours and
"HOURS X 1000" to get the number of 1000 hours
accumulated.
17. Press the "PROGRAM TEMPERATURE" but-
ton to change the temperature set points. Press it
again to change the "CYCLE SET POINT".
The display should read 160°.
18. Decrease the "CYCLE SETPOINT TEMPERA-
TURE" until the heater cycles to low flame.
19. Open or close the low cycle ball valve until the gas
pressure is 3-5 lbs. for LP, or 1-2 lbs. for natural gas.
The display will indicate "FLAME" when flame is sensed.
If no flame is sensed the "FLAME" message will be off.
The display indicates what part of the cycle it is in. The
display will indicate whether it is in the "HI-FLAME" or
"LO-FLAME" part of the cycle (see "Programming Top
Dry Plenum And Grain Temperatures" page 15, for set-
ting the HI/LO-FLAME temperature). If the tempera-
ture is above the high temperature setting, the flame will
be off, the "FLAME" message will be out and the dis-
play will be flashing "OFF-CYCLE".
The limits are continuously checked during the
drying operation. A limit switch open or any other
error condition will cause the dryer to
Running Fan Without Burner
1. To run fan without burner press the down arrow
key then press the start key. This will start the fan
without running the burner. The fan will run
continuously until the toggle switch is shut off.