Bradford White RG130T*N Series Service Manual page 24

SERVICE PROCEDURE RG-VI
Gas Control Testing, Disassembly &
Replacement (Honeywell)
Stored water may be HOT when performing the following steps in this procedure.
DETERMINE WATER TEMPERATURE INSIDE TANK
Note: It is important to understand once the resistance for the temperature sensor is determined
from the previous page, water flow through the water heater should not occur. Prior to
drawing water from drain valve, turn off the cold-water supply to the water heater. This will
prevent cold water flow into the tank affecting the resistance value of the temperature sensor.
Step 1.
Set the Gas Control knob to the "OFF" position. Turn
Step 2.
off inlet water supply to water heater.
Step 3.
Draw approximately 4 gallons of water from drain valve into a container, or suitable drain, and
discard. Draw an additional gallon and immediately measure water temperature using an accurate
thermometer. It may be necessary to open a hot water faucet to allow water heater to drain.
Step 4.
Using the chart below, determine correct resistance value for the water temperature from step 3.
Example:
If temperature of water is 84°F, then the resistance through the sensor
would be 8449 (see shaded area). NOTE: Sensor resistance increases
as the temperature decreases.
5 6 °F 7 0
22771 22163 40 21573 26109
17440 16990 50 16553 19906
13477 13140 60 12812 15314
10502 10248 70 10000 11884
8250 8057 80 7869 9299
6531 6383 90 6238 7333
5208 5094 100 4982 5827
4183 4094 110 4006 4663
3382 3312 120 3244 3758
2752 2697 130 2643 3048
2253 2209 140 2166 2488
1856 1820 150 1786 2043
1537 1509 160 1481 1688
1280 1257 170 1235 1402
1071 1953 180 1035 1170
901 886 190 871 982
762 749 200 737 828
24
24
Take necessary precaution to prevent personal injury.
Sensor Resistance at Various Temperatures
8 1 9 2 3
21000 25400 20445 24712 24045
16128 19383 15715 18876 18383
12494 14925 12185 14548 14180
9760 11592 9526 11308 11032
7685 9078 7507 8862 8653
6098 7165 5961 7000 6839
4873 5697 4767 5570 5446
3922 4562 3839 4464 4368
3177 3679 3112 3602 3527
2590 2986 2538 2925 2866
2124 2439 2083 2391 2344
1753 2004 1720 1966 1928
1454 1656 1427 1625 1595
1213 1376 1191 1351 1327
1017 1150 999 1129 1110
857 965 842 949 933
725 814 713 801 788
SERVICE PROCEDURE RG-VI
Gas Control Testing, Disassembly &
WARNING
In Degrees F
4 5 6
23399 22771 22163
17905 17440 16990
13823 13477 13140
10763 10502 10248
8449 8250 8057
6683 6531 6383
5326 5208 5094
4274 4183 4094
3453 3382 3312
2808 2752 2697
2298 2253 2209
1891 1856 1820
1566 1537 1509
1303 1280 1257
1090 1071 1953
917 901 886
775 762 749
Replacement (Honeywell)
7 8 9
21573 21000 20445
16553 16128 15715
12812 12494 12185
10000 9760 9526
7869 7685 7507
6238 6098 5961
4982 4873 4767
4006 3922 3839
3244 3177 3112
2643 2590 2538
2166 2124 2083
1786 1753 1720
1481 1454 1427
1235 1213 1191
1035 1017 999
871 857 842
737 725 713