User Guide & Service Manual

USER GUIDE
Thermistor 1
u-line.com
SAFETY • INSTALLATION & INTEGRATION • OPERATING INSTRUCTIONS • MAINTENANCE • SERVICE
Thermistors
Thermistors are used for various temperature readings.
Thermistors provide reliable temperature readings using a
resistance which varies based on surrounding
temperatures. If a faulty thermistor is suspected it may
be tested using an accurate ohmmeter.
Thermistor connections must be kept clean. A thermistor
connection that has become corroded can cause
resistance values from the thermistor to change as they
pass through a dirty connection to the board.
It is for that reason that we apply dielectric grease to all of
our thermistor connections. Dielectric grease will help to
keep thermistor connections clean and dry.
If you change a thermistor in the unit please re-apply
dielectric grease to the connection. If you encounter a
dirty thermistor connection, you should replace the
thermistor and the thermistor harness.
This unit has three thermistors.
Thermistor one (Ice Bin):
Located along the right hand side wall of the ice bin. It is
used to maintain the ice level in the bin.
Thermistor two (Condensor Line Out):
Located on the liquid line. It is used during freeze/
harvest.
Thermistor three (Ambient):
Located in the base of the unit (secured to the
condenser). It is used to monitor the ambient temperature
within the base compartment. It is used for diagnostics.
This unit uses two different thermistors: Ice Bin and
Ambient Thermistors; Condenser Line Out Thermistor.
The Ice Bin and Ambient Thermistors are both type 1
thermistors. If a thermistor is suspected of being defective
the resistance can be verified. Place the thermistor in an
ice water bath, the resistance should read 16.5k OHMs
+/-5% on your meter.
Thermistor Resistance Data - Type 1
Temp (F) Temp (C)
Nominal Resistance
(OHMS)*
-40 -40 169157
-31 -35 121795
-22 -30 88766
-13 -25 65333
-4 -20 48614
5-15 36503
14 -10 27681
23 -5 21166
32 0 16330
41 5 12696
50 10 9951
59 15 7855
68 20 6246
77 25 5000
86 30 4029
95 35 3266
104 40 2665
113 45 2186
122 50 1803
131 55 1495
140 60 1247
149 65 1044
158 70 879
167 75 743
176 80 631
* (+/-5%)
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