SERVICE (cont.)
Steam Sensor (Thermistor)
Location:
The thermistor is located on the end of the overflow tube above the overflow cup.
To test the thermistor, access will also be needed to the electronic control board.
H 5X |
P1993 |
FIG. 17a LOCATION |
H 10X |
P1993 |
FIG. 17b LOCATION |
Test Procedure:
1.Disconnect the dispenser from the power source.
2.Disconnect the thermistor from J5 on control board.
3.Check the resistance across thermistor with a ohmmeter. The resistance range is approximately 9K
@ room temperature to approximately 2K
@ 200°F.
4.Disconnect the dispenser from the power source.
If resistance was present as described, the thermistor is working.
If resistance was not present as described, replace the control board.
17
Removal and Replacement:
1.Disconnect the dispenser from the power source.
2.Disconnect the thermistor from J5 on control board.
3.Loosen the set screw and the two screws securing the two half blocks together. Remove thermistor assembly from overflow tube.
4.Install new thermistor on tube and slide down until it contacts the flared end. NOTE: It’s critical that the thermistor be centered directly under the tube opening.
5.Snug the set screw so the block assembly does not move aroung easily.
6.Connect the thermistor to J5 on control board.
NOTE: DO NOT TEST OPERATION WITH PANELS REMOVED, AS AIR MOVEMENT CAN HINDER PROPER READINGS ON THERMISTOR.
Mounting screws |
Set screw |
DO NOT BEND |
THERMISTOR |
UP/DOWN |
FIG. 17c STEAM SENSOR EXPLODED |
Thermistor centered |
under tube opening |
FIG. 17d THERMISTOR POSITION |
42311 080510 |
