Grain-systems PNEG-526 User Manual download pdf (Page 39)

Tower Dryer Operations & Service TROUBLESHOOTING

Problem What to do

Pilot will not light.

(Continued) - If pilot still doesn’t light, check pilot area on burner. Clean if necessary.

- If pilot area is hot indicating that the pilot was lighting, replace flame rod.

- If pilot area is cold, replace spark plug.

- If pilot still doesn’t light, check the Protectofier components in the control box.

Pilot lights but main burner - Check for water in gas train by opening drain valve.

will not light - Maxon valve should offer some resistance when opening. If it doesn’t,

check latching solenoid inside Maxon valve.

- Check for broken or bent butterfly valve.

- Check to make sure burner ports around the pilot are clean.

Dryer will not reach operating - Increase gas pressure on main gas regulator.

temperature. - Make sure dryer is completely full of grain.

- Gas ports on burner need to be drilled. Clean by using a #43 drill bit.

- Check to make sure butterfly valve is fully opening.

- Check for water in gas train by opening drain valve.

Plenum temperature fluctuates. - Gas pressure is to high. Lower gas pressure on main gas regulator.

Dryer loses flame at regular - Loose or dirty flame rod. Clean and/or tighten.

intervals while running. - Defective Protectofier SS3CP transformer in control box. Replace.

Modulating Valve - Check to see that Maxon shutoff valves are open.

does not open. - Check to see that the plenum setpoint temperature is higher than the ambient

temperature.

- Check to see that 120VAC is being provided to the black and white wires in

the modutrol motor.

- Check the operation of the modutrol motor be momentary jumping the “F” and

“-“ terminals in the motor to see if the motor will open.

TROUBLESHOOTING – GENERAL

Problem What to do

Control power switch - Check to see that main circuit breaker in power box is on.

will not light. - Check fuses “F1”, “F2”, “F3” in power box.

- Check circuit breaker “CB-04” in power box.

- Check MicroLogix PLC in control box.

OIU fails to light. - Check to see that main circuit breaker in power box is on.

- Check fuses “F1”, “F2”, “F3” in power box.

- Check circuit breaker “CB-04” in power box.

Dryer shuts down, red light lights - Check for possible fire in heat section of dryer.

and horn sounds, display shows: - Make sure the plenum high limit control is set at least 30° above the desired

“OVERHEAT AT PLENUM” drying temperature.

“POSSIBLE FIRE” - Check for a malfunctioning gas train component that could be causing excessive

plenum temperatures.

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Grain-systems PNEG-526 User Manual Page 39