Grain Systems PNEG-1181 - Manual (Page 59)

9. Wiring Reference
PNEG-1181 Portable Dryer Troubleshooting 59
Procedure for Locating, Testing and Replacing a Defective Grain
Temperature Sensor (Continued)
7. Strip back about 1/4 inch from the end of each 26 Ga. sensor wire.
8. With an ohm meter, set the scale to 20k (if it is not an autorange model).
9. Place the black lead into the butt connected wire connection with the 2-26 Ga. wires.
10. Connect the red lead to either of the disconnected 26 Ga. wires and note the reading.
11. Move the red lead to the other disconnected 26 Ga. wire and note this reading.
12. Repeat Step 6 through Step 11 on the other side of the dryer.
13. Notice that three (3) readings will be very close to each other, but one reading will be different. The
different reading identifies the defective sensor. (Compare readings to Resistance/Temperature
Chart on Page 60 .)
14. If a replacement sensor is not immediately available, jump to How to Bypass the Grain
Temperature Sensor .
Sensor Replacement:
15. The grain sensors are mounted to the grain overheat capillary and need to be removed together.
16. To remove the overheat switch, disconnect the grain thermal overheat wires.
17. Remove the two (2) self-tapping screws and slide the bracket, overheat switch and sensors out of
the conduit.
18. Remove the tape surrounding the defective grain sensor and then remove the sensor.
19. Place the new sensor upon the capillary and apply tape to secure it.
20. Slide the overheat switch and sensors back into the conduit until the bracket for the overheat switch
is in the same mounting position as before.
21. Replace both mounting screws into the overheat switch mounting bracket.
22. Butt connect together one wire from each of the grain sensors.
23. Connect one of the remaining grain sensor wires to the black 18 Ga. wire.
24. Connect the other remaining grain sensor to the white 18 Ga. wire.
25. Connect one of the grain overheat switch wire to each one of the colored wires.
26. Reconnect the other side of the dryer following steps 22 through 24 .
27. Double check the wire connections and replace the covers on the boxes.
How to Bypass the Grain Temperature Sensor
If an extra grain sensor is not immediately available to replace the defective one, it is possible to rewire
the sensors so that only one (1) sensor monitors the grain temperature rather than four (4) sensors. The
dryer will continue to operate normally with only one sensor, however, it will only monitor a small section
of the grain columns.
1. On the side of the dryer in which sensor is defective, leave this sensor and the joining sensor
disconnected from the white and black 18 Ga. wires. Be sure to cap these 18 Ga. wires OFF.
2. On the other side of the dryer, take one of the small white grain sensor wires and connect it to the
white 18 Ga. wire.
3. From the same sensor connected to the white 18 Ga. wire, connect the other small white grain
sensor wire to the black 18 Ga. wire.
4. Double check the wire connections then replace the covers on the boxes.