Airstream PNEG-343 service manual Problem Possible Cause

TROUBLE ANALYSIS PROCEDURE

Problem Possible Cause

Grain not moving through columns.

1.Check the dryer for fine material buildup inside the columns.

2.Avoid leaving the dryer columns full for long periods at a time (2-3 days) while not operating the dryer or during rainy weather.

3.Empty the dryer. Keep the dryer clean! Do not allow fine material to gather in the plenum chamber.

4.It may be necessary to open the strike off plates in the affected columns in half inch intervals.

Uneven drying-Some kernels appear brown while others

are under dried.

Uneven heat exiting from dryer columns.

1.Check plenum thermostat temperature setting. Some varieties of grain are more sensitive to higher operating temperatures. It may be necessary to lower the plenum operating temperature to accommodate this.

2.Check for proper burner alignment (side to side). Vibration during shipment may have caused misalignment.

Burner will not fire with fan operating.

1.Burner switch must be on.

2.Check for power to ignition board.

Heater switch light and gas solenoids go on and off

erratically-The light blinks on and off while the solenoids

"chatter".

1.The blinking light indicates the flame sensor is not detecting flame.

2.The "chattering" solenoids are caused by the loss of flame detection, and the thermostat and Fenwal ignition board trying to reestablish a flame. Check for loose wires on flame sensor; replace or repair wires or sensor.

Burner will not fire-No gas pressure with fan operating at least 15 seconds (gas supply or fan heater malfunction).

1.Check gas supply. Also, check gas filter and gas line for possible obstruction or closed valves. Refill tank; replace or repair parts, as required.

2.Inspect gas solenoid valves (including liquid valve on LP units) for defective coils or improper wiring. Replace valve or coil if valve will not open with proper voltage applied (120 volts).

3.Check for proper voltage. 120 volts across L1 and L2 incoming voltage to the Fenwal Ignition Board, and 115 volts outgoing across V1 and V2 to the solenoids.

Burner will not fire-But gauge shows gas pressure.

1.Fenwal Ignition Board: Check board for spark by removing ignition wire from board, and holding aninsu- lated screwdriver against the output terminal and 1/4" away from the control box casing. There should be a strong spark. Check board wire connections. Replace the Fenwal board, if necessary.

2.Ignitor: Check that the ignitor is properly gapped to 1/8" and that it has a strong spark. Inspect the porcelain and electrodes for damage or cracking. Replace or clean if necessary.

Burner maintains desired drying temperature-but cycles

from hi-fire to off (without going to lo-fire).

1.Make sure the low flow control valve is not completely closed. Valve must be adjusted open to provide the proper lo-fire gas pressure listed in this manual.

2.Check lo-fire solenoid valve for proper operation.

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