Grain Systems PNEG-1181 User Manual
Page 61
9. Wiring Reference
PNEG-1181 Portable Dryer Troubleshooting
61
Procedure for Locating, Testing and Replacing a Defective
Plenum Temperature Sensor
Symptoms of a bad sensor may include:
• Temperature readings that are not consistent with the ambient outside temperature or with a verified
plenum temperature that has been taken with a thermometer.
• Erratic plenum display readings.
• Plenum temp open or plenum temp short.
Troubleshooting:
1. There is only one sensor to check for each plenum. The process of checking the sensor is similar
to checking the grain sensors.
2. The actual plenum sensor is located in the plenum just inside the rear access door to the left.
(Facing the rear of the dryer)
3. Start at the heater board that is associated with the plenum sensor to be checked.
(Each plenum has its own plenum sensor.)
4. The wires from the sensor (which are butt connected at the sensor) go through a conduit in the
plenum section of the dryer. This conduit terminates at a white plastic 4" x 4" junction box. This box
is located on the front of the dryer to the right of the fan/heater. (Facing the front of the dryer.) From
that point to the heater board.
5. The wires are connected to terminals J7-12 (white wire) and J7-13 (black wire) on the back of the
of heater board.)
Figure 9C Heater Board (Part No. HF-7276N)
6. Unhook these wires.
7. Check for resistance in relationship to a known temperature.