Grain Systems PNEG-1702 - Manual (Page 43)

6. Competitor/Dri-Tek Test Firing
PNEG-1702 ETL Listed GSI/FFI Portable Dryer Manual 43
Fan Switch
Bump the Fan switch and observe the fan rotation. The fan should run counterclockwise. Sometimes on
3 phase models all motors on the dryer will run backwards. They can easily be reversed by interchanging
two of three power supply wires. Reverse the two (2) outside wires, L1 and L3 and leave the middle one
in the same position.
NOTE: If the dryer is empty, the burner does not operate. The fans cannot create enough static pressure
to engage the Air switch. You will receive a “no airflow” message. To start the dryer when it is low
on grain, the Airflow switches must be turned OFF. Switching Dip Switch number eight (#8), on the
back of the computer control board, to ON turns the Air Switch OFF.
Burner Safety
To check the burner safety function, 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 shutdown after 20 seconds. The
safety message, “loss of flame” will appear.
Burner Test Fire
The following test should be done with grain in the dryer. If no grain is present, set approximate pressure
settings and fine tune when grain arrives. Test fire the burner by starting the fan and then turn the
Burner switch to ON with the fuel supply turned ON. The heater should ignite after a short purge delay of
approximately 10 seconds. Gas pressure should be shown on the gauge. At this time, set the high-fire and
low-fire pressure settings. Use the pressure regulator
(See Figure 6D on Page 44) for high-fire and the
needle valve located in the side of the cycle solenoid (low-fire) valve (See Figure 6D on Page 44) for
low-fire. The burner should cycle between high-fire and low-fire, approximately 2 or 3 times per minute.
Approximate settings should be:
If the burner remains on high-fire and does not cycle, increase the regulator setting, in order to reach the
thermostat setting. If the burner remains in low-fire and does not cycle, slightly decrease gas pressure with
the low-fire solenoid needle valve. If the gas pressure is decreased too much, a popping or fluttering
sound will be heard. Be sure to adjust the low pressure needle valve anytime the high pressure regulator
is adjusted.
LP Gas Natural Gas
High-Fire 6-15 lbs. High-Fire 6-10 lbs.
Low-Fire 2-6 lbs. Low-Fire 1-3 lbs.
WARNING
Dip switch number eight (#8) must be turned back to the OFF position after this
test is complete or no air testing will occur.