Bradford White EFR160T120 Series Installation & Operating Manual page 70

Procedure for Checking Thermostat Sensors
Set the thermostat above water temperature (See temperature adjustment section) and observe system through one (1)
complete cycle. Make sure system operates as desired.
To check the sensor assembly, compare the resistance of the sensor wires (either outside black to center wire with
yellow marking) as measured by an ohmmeter to the water temperature as measured by an accurate thermometer.
Thermistor resistance increases as the temperature decreases. The tables below show the correct sensor resistance at
various temperatures. Both thermistors in the sensor assembly should have approximately the same readings.
Replace the sensor if the ohm reading in the chart does not approximate the reading from the sensor at the temperature
measured in the tank. Use a thermometer or thermocouple to measure the temperature from the hot water outlet or
T&P valve.
°F
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
°C
0
10
20
30
40
50
60
70
80
90
Manufactured under one or more of the following U.S. Patents: RE.34,534;
B1 5,341,770; 4,416,222; 4,628,184; 4,669,448; 4,672,919; 4,808,356; 4,829,983;
4,861,968; 4,904,428; 5,000,893; 5,023,031; 5,052,346; 5,081,696; 5,092,519;
5,115,767; 5,199,385; 5,277,171; 5,372,185; 5,485,879; 5,574,822; 5,596,952;
5,660,165; 5,682,666; 5,761,379; 5,943,984; 5,954,492; 5,988,117; 6,142,216;
6,684,821; 7,063,132;
Other U.S. and Foreign patent applications pending. Current Canadian Patents:
1,272,914; 1,280,043; 1,289,832; 2,045,862; 2,092,105; 2,107,012; 2,108,186;
2,112,515
0 1 2
26109 25400 24712
19906 19383 18876
15314 14925 14548
11884 11592 11308
9299 9078 8862
7333 7165 7000
5827 5697 5570
4663 4562 4464
3758 3679 3602
3048 2986 2925
2488 2439 2391
2043 2004 1966
1688 1656 1625
1402 1376 1351
1170 1150 1129
982 965 949
828 814 801
0 1 2
32648 31026 29495
19898 18968 18088
12492 11942 11419
8057 7722 7403
5327 5117 4917
3602 3468 3340
2488 2400 2316
1752 1693 1637
1256 1216 1177
916 888 861
In Degrees F
3 4 5
24045 23399 22771
18383 17905 17440
14180 13823 13477
11032 10763 10502
8653 8449 8250
6839 6683 6531
5446 5326 5208
4368 4274 4183
3527 3453 3382
2866 2808 2752
2344 2298 2253
1928 1891 1856
1595 1566 1567
1327 1303 1280
1110 1090 1071
933 917 901
788 775 762
In Degrees C
3 4 5
28049 26682 25389
17253 16461 15710
10922 10450 10000
7099 6808 8532
4726 4543 4368
3217 3099 2986
2235 2157 2083
1582 1530 1480
1140 1105 1070
835 810 786
70
6 7 8
22163 21573 21000
16990 16553 16128
13140 12812 12494
10248 10000 9760
8057 7869 7685
6383 6238 6098
5094 4982 4873
4094 4006 3922
3312 3244 3177
3697 3643 2590
2209 2166 2124
1820 1786 1753
1509 1481 1454
1257 1235 1213
1053 1035 1017
886 871 857
749 737 725
6 7 8
24166 23010 21915
14998 14322 13680
9572 9165 8778
6268 6016 5775
4201 4042 3889
2878 2774 2675
2011 1942 1876
1432 1385 1340
1037 1005 974
763 741 719
9
20445
15715
12185
9526
7507
5961
4767
3839
3112
2538
2083
1720
1427
1191
999
842
713
9
20879
13071
8409
5546
3742
2579
1813
1297
944
698