U-Line U-3018CLR User Manual & Service Manual page 61

USER GUIDE
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)
-40 -40
-31 -35
-22 -30
-13 -25
-4 -20
5 -15
14 -10
23 -5
32 0
41 5
50 10
59 15
68 20
77 25
86 30
95 35
104 40
113 45
122 50
131 55
140 60
149 65
158 70
167 75
176 80
* (+/-5%)
u-line.com
Nominal Resistance
(OHMS)*
169157
121795
88766
65333
48614
36503
27681
21166
16330
12696
9951
7855
6246
5000
4029
3266
2665
2186
1803
1495
1247
1044
879
743
631
Thermistor 1