Grain Systems PNEG-1717 - Manual (Page 33)

7. Vision Test Firing
PNEG-1717 CE Approved GSI/FFI Portable Dryer Manual 33
Dryer Pre-Season Checks (Continued)
16. Confirm that the meter roll control increases and decreases speed.
NOTE: Brushes inside the DC meter roll motor to become corroded after a period of no use, causing
a roll malfunction. This may be fixed by tapping the motor with a rubber mallet. Subsequent
operation should be normal.
17. Check fan rotation (counterclockwise) and reverse if required. (Swap any 2 phases on the fan
power supply.)
18. Check the burner safety function. Turn OFF the main gas valve. With the fans ON, turn the Heater
ON. The dryer should shut down after 20 seconds and “Ignition Failure Fan #” will appear. Reset the
dryer and repeat for each fan/heater.
Burner Test Fire
Repeat the following for each fan/heater:
1. The dryer must be full of grain, or the Air switch disabled. (SETUP > DIAGNOSTICS > DISABLE
TESTING > Yes > EXIT) After 5 minute, air switches will return to normal and cannot be disabled
again until the dryer has been re-started.
2. Test fire each burner. Turn the Burner switch to ON. The burner should ignite after a 10 seconds
purge delay.
3. Gas pressure should be shown on the gauge.
4. Adjust the plenum set point to 90°C (Temp > Plenum 1 Temp > 90 > Accept). Burner should be
in High-Fire.
5. Set gas pressure at regulator (use ball valve on NG).
6. Drop plenum set point until burner goes to Low-Fire.
7. Set Low-Fire pressure using needle valve screw on cycle valve. Burner should cycle between high
and low 1-3 times per minute.
8. If the burner does not cycle to Low-Fire, increase the regulator setting.
9. If the burner does not cycle to High-Fire, decrease gas pressure cycle valve.
10. If the flame pops or flutters, the pressure is too low. This can damage the burner. Increase pressure
to eliminate.
Approximate setting should be:
LP Gas Natural Gas
High-Fire 450 mBar High-Fire 450 mBar
Low-Fire 70-220 mBar Low-Fire 70-220 mBar