Grain Systems PNEG-1702 - Manual (Page 48)

7. Vision Test Firing
48 PNEG-1702 ETL Listed GSI/FFI Portable Dryer Manual
Fan Switches
Briefly turn each Fan switch to ON and observe the fan rotation. The fan should run counterclockwise.
Sometimes on 3 phase models, all motors run backwards. They can easily be reversed by interchanging
two of the three power supply wires. Reverse the two (2) outside wires, L1 and L3 and leave the middle
one in the same position.
NOTE: The bottom fan on the dryer is always referred to as fan 1.
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. Turn the Heater switch ON for that fan. The dryer will shutdown 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 must be full of grain, otherwise the air switch will need to be disabled,
if the dryer is empty. To disable, touch the Setup button at the bottom of the Default Operation Screen.
When the Setup Screen appears touch the Diagnostics button to display the system diagnostics. To
disable the air switch select the Disable Testing button in the air switch box of the System Diagnostics
Screen. The vision computer will then display a prompt asking if you wish to disable the air switch. Choose
yes to continue. Once the air switches are disable the Fan switches on the switch panel will illuminate and
the fan/heaters on the display animation will change to blue indicating that “airflow” is simulated.
There is only a 5 minutes period after the dryer is turned ON that the air switches can be disabled. After
that time the Air switches cannot be disabled and any Air switches that are disabled will return to the
enabled state causing an airflow shutdown if the dryer is empty. To restart the 5 minutes testing period the
dryer must be shutdown and restarted. The 5 minutes testing period starts when the Control Power switch
is turned ON.
Test fire each burner by starting 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 setpoint to 200°F (93°C), causing the burner to operate
on high-fire. Observe the gas pressure on the gauge and lower the plenum setpoint until it causes the
burner to cycle into low-fire. When the plenum temperature setpoint is met, the gas pressure should show
a noticeable drop, indicating that the cycle solenoid is closed and the burner is being supplied with less
gas through the cycle solenoid bypass port. At this time set the high-fire and low-fire pressure settings.
Use the pressure regulator for high-fire and the adjustment screw on the cycle solenoid for low-fire. The
computer should cycle the burners between high and low, approximately 1 to 3 times per minute.
Use only the amount of pressure required to obtain the desired temperature.
WARNING
All power should be switched OFF and locked out before attempting to reverse
the connections.