Grain Systems PNEG-526 - Manual (Page 39)

Tower Dryer Operations & Service TROUBLESHOOTING
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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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