Grain Systems PNEG-1181 - Manual (Page 58)

58 PNEG-1181 Portable Dryer Troubleshooting
9. Wiring Reference
Procedure for Locating, Testing and Replacing a Defective Grain
Temperature Sensor
Symptoms of a bad sensor may include:
• Temperature readings that are not consistent with the ambient outside temperature or with any
known or verified grain temperatures entering the dryer.
• Grain temperature open or grain temperature short on network dryers.
• Display readings of 255°F or -127°C.
Figure 9A Grain Thermistor Sensor
Troubleshooting:
1. Locate the left and right grain sensor electrical boxes on the dryer. (See Figure 9B.)
2. Open each box by removing the lid, which is held in place by four (4) phillips head bolts and nuts.
3. Determine which wires to test by identifying the wire routing.
Figure 9B
4. The grain sensor wires are small white wires (26 Ga.) and are connected to a 18 Ga. white and a
18 Ga. black wire with two (2) of the smaller (26 Ga.) grain sensor wires butt connected together.
5. The grain thermal overheat switch is a black disk mounted on a silver bracket with two (2) black
18 Ga. wires connected to two (2) colored wires.
6. Disconnect the white and black 18 Ga. wires from the smaller white grain sensor wires.
Sensor wires
(small white
26 Ga.)
Sensor wires (small
white 26 Ga.)
Grain thermal
overheat wires
Grain thermal
overheat wires
Mounting screws
Grain thermal
overheat switch