Grain Systems PNEG-1459 - Manual (Page 18)

18 PNEG-1459 L Series Operators
TEST FIRING
utes, and then the dryer will shutdown leaving the safety shutdown message (out of grain warning) displayed. Press the dryer
power stop button to reset the panel, then press the start button.
UNLOAD AUTO OPERATION
To check auto operation place the unload switch in the auto setting. Turn the meter roll dial until the meter rolls start rotat-
ing. The bottom auger should rotate counterclockwise as viewed from the drive end. The meter roll drive motor should ro-
tate clockwise as viewed from the drive end of the gear box. If the dry grain take away auxiliary is wired to the dryer, it
should start and rotate in the proper direction.
UNLOAD MANUAL OPERATION
To check manual operation move the unload switch to the manual position. Turn the meter roll dial until the meter rolls start
rotating. The bottom auger should rotate counterclockwise as viewed from the drive end. The meter roll drive motor should
rotate clockwise as viewed from the drive end of the gear box. If the dry grain take away auxiliary is wired to the dryer, it
should start and rotate in the proper direction.
METER ROLL OPERATION
To check the meter roll operation turn the knob clockwise, and the meter roll speed should increase. Turning the knob coun-
terclockwise will decrease the speed. When the meter rolls are set to maximum (1000) the meter roll speed should be 17.5
RPM for 8” (20 cm) discharge augers. Make sure the drive chain tension is properly adjusted and all sections of the meter
rolls rotate. Turn the unload switch off after these checks are complete. The bottom auger will continue to run for 60 sec-
onds (default clean out delay setting) after the switch is turned off to allow for clean out.
Note: Due to the nature of the DC drive motor used on the meter rolls, it is possible for the brushes inside the motor
to become corroded if the dryer has not been operated for several months. This will cause the meter rolls not to func-
tion. To fix this problem, use a rubber mallet or a piece of wood to tap the DC drive motor. The shock is usually all
the motor needs to start working again. You should not have any more problems with this during the rest of your
drying season.
FAN SWITCHES
Momentarily turn each fan switch to on and observe the fan rotation. The fan should run counterclockwise. Sometimes on
three phase models all motors will run backwards. They can easily be reversed by interchanging two of the three power sup-
ply wires. All power should be switched and locked off before attempting to reverse the connections. Reverse the two out-
side wires, L1 and L3, and leave the middle one in the same position.
BURNER SAFETY
To check the burner safety function, first make sure the main gas valve is off. Turn the fan switch on and allow the fan to
start. Then, turn the heater switch on for that fan. The dryer will shut down after 20 seconds. The safety message, “Ignition
Failure Fan #” will appear. Reset the dryer and repeat for the other fan/heater(s).
BURNER TEST FIRE
To perform this test the dryer will need to be full of grain or the air switch need to be disabled. Test fire each burner by start-
ing the fan. Turn on the fuel supply then, turn the burner switch to on and the burner should ignite after a short purge delay
of approximately 10 seconds. Gas pressure should be shown on the gauge. At this time adjust the plenum set point to 200°F
(93°C), causing the burner to operate on hi-fire. Observe the gas pressure on the gauge, and lower the plenum set point until
it causes the burner to cycle into lo-fire. When the plenum temperature set point is met, the gas pressure should show a no-
ticeable drop, indicating that the cycle solenoid is closed and the burner is being supplied with less gas through the cycle so-
lenoid bypass port. At this time set the hi-fire and lo-fire pressure settings. Use the pressure regulator (for LP models) or the
supply line ball valve (for nat. gas models) for hi-fire and the ball valve on the lo-fire bypass line for lo-fire (see images on page
39 for help). The computer should cycle the burners between high and low, approximately 1 to 3 times per minute.
Only use pressure required to obtain desired temperature.