Grain Systems PNEG-1707 - Manual (Page 35)

7. Test Firing
PNEG-1707 TM-Series Tower Dryer 35
Unload Auto Operation
To check auto operation place the Unload switch in the AUTO setting. Check unload equipment for
proper rotation.
Unload Manual Operation
To check manual operation move the Unload switch to the MANUAL position. Check unload equipment
for proper rotation.
Accutrol Sweep Metering System Operation
To check the metering operation turn the knob clockwise, and the metering speed should increase.
The metering system should be turning clockwise when viewed from above. Turning the knob
counterclockwise will decrease the speed. When the meter system is set to maximum (1000) the meter
roll speed should be 2.6 RPM. Turn the Unload switch OFF after these checks are complete. The
adjustable dry grain auger will continue to run for 60 second (default clean out delay setting) after the
switch is turned OFF to allow for clean out.
Fan Switch
Momentarily turn the Fan switch to ON and observe the fan for rotation.
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. The dryer will go through a 15 second purge
time follower by a 10 second ignition time. The dryer will them shut down. The safety message, “Ignition
Failure Fan #” will appear.
Burner Test Fire
Test fire the burner by starting the fan. Adjust the plenum temperature set point to 140°F (60°C). On LP
fired dryers, open the liquid shut off valve and the manual shut off valve. On NG fired dryers, open the
manual shut off valve. Turn the Burner switch to the ON position. After a 30 second purge time, the main,
blocking and bypass solenoid shut off valves (and the liquid solenoid valve on LP fired dryers) will open
and the burner will illuminate. The Burner switch should be illuminated and the plenum temperature will
start to increase. On LP fired dryers, adjust the gas pressure regulator so that the inlet pressure on the
fuel train is at approximately 7-9 PSI. On NG fired dryers, the manual shut off valve should be used to
adjust the inlet pressure to 7-10 PSI of pressure.
(See Figure 7A and Figure 7B on Page 36.) When the
plenum temperature reaches the set point, the bypass solenoid will close. Adjust the bypass solenoid
adjustment screw so that the burner pressure gauge reads approximately 8-12 ounces of pressure on
Low-Fire. Turning the adjustment screw clockwise decreases the burner pressure when the bypass
solenoid is closed. The computer should cycle the burner between High-Fire and Low-Fire 4 to 5 times
a minute. If, during normal operation, the burner continuously remains on High-Fire or does not get to
operating temperature, slightly open the manual shut off valve on NG dryers or slightly increase the
regulator pressure on LP dryers. If the burner stays on Low-Fire and does not cycle, slightly close the
bypass solenoid by turning the adjusting screw clockwise.