8.2.7 Thermistors
ALL THERMISTORS ARE IDENTICAL.
Refer to Section 8.1.2, page 89, for a description
of the thermistor functions.
To check the thermistor:
1. Verify the temperature of the water
with a calibrated test instrument.
2. Refer to Section 7.4.2, page 74-75,
Connector CN3 on the Temperature/
Pressure Display Board provides the
test points for checking the thermistor
temperature output.
To replace the thermistor:
1. Turn the main water supply to the
machine off.
2. Push the POWER pushbutton off,
if machine is ON, to enter auto-shutdown.
Otherwise, turn machine on then off.
This will bleed pressure off water line.
3. Turn off main incoming power.
4. Pull machine out if necessary.
5. Remove panels as required.
6. Disconnect the molex connector
on the thermistor leads.
7. Remove the thermistor.
8. Apply Loctite 565 pipe sealant, or
comparable, to the threads of the
replacement part.
9. Install in reverse order.
10. Restore power and water, and check for
leaks and proper operation.
11. Reinstall panels.
12. Return machine to permanent location
ensuring machine is level.
13. Check supply hoses at rear of machine
to ensure they are not kinked.
Part 8:
COMPONENT REPAIR AND REPLACEMENT
Final rinse manifold
UH-200B, UH-200
Fill chute
UH-100B, UH-100,
UL-100
Booster tank
UH-200B, UH-100B
Wash tank
All models
Thermistor Resistance Chart (Approx. Ohms)
80
°
F/27
°
C
=
9,165
90
°
F/32
°
C
=
7,400
100
°
F/38
°
C =
5,775
110
°
F/43
°
C =
4,725
120
°
F/49
°
C =
3,740
130
°
F/55
°
C =
2,985
140
°
F/60
°
C =
2,490
150
°
F/66
°
C
=
2,010
160
°
F/71
°
C
=
1,690
170
°
F/77
°
C
=
1,385
180
°
F/82
°
C
=
1,180
190
°
F/88
°
C
=
975
200
°
F/93
°
C
=
840
210
°
F/99
°
C
=
870
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