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L8104A,B,C,D
SETTING AND CHECKOUT
SET CONTROL TEMPERATURE
If the potentiometer is mounted on the control module,
turn the selector knob to the desired temperature.
If the potentiometer is remotely mounted, the position of
the flat part of the shaft determines the approximate control
temperature. Fully counterclockwise
the shaft is towards you is the minimum setting. Fully
clockwise
rotation is the maximum setting. Actual
temperature range depends on the control module and the
potentiometer selected. See Fig. 11.
CHECKOUT
Set the L8104 above water temperature and observe the
system through one complete cycle. Make sure system
operates as desired.
To check the thermistor or thermistor/ECO assembly,
compare its resistance as measured by an ohmmeter to the
water temperature as measured by an accurate thermom-
eter. Thermistor resistance increases as the temperature
falls. See Table 1 or 2 for the correct sensor resistance at
various temperatures.
TABLE 1—THERMISTOR RESISTANCE AT VARIOUS TEMPERATURES IN FAHRENHEIT.
Temp-
erature
(°F)
0
40
26109
50
19906
60
15314
70
11884
80
9299
90
7333
100
5827
110
4663
120
3758
130
3048
140
2488
150
2043
160
1688
170
1402
180
1170
190
982
200
828
68-0063—3
rotation when
1
2
3
25400
24712
24045
19383
18876
18383
14925
14548
14180
11592
11308
11032
9078
8862
8653
7165
7000
6839
5697
5570
5446
4562
4464
4368
3679
3602
3527
2986
2925
2866
2439
2391
2344
2004
1966
1928
1656
1625
1595
1376
1351
1327
1150
1129
1110
965
949
933
814
801
788
Setting and Checkout
Fig. 11—Scale range for 3K remotely mounted
potentiometer when used with L8104B Dual
Bulb Controller.
200650 POTENTIOMETER
180
MAXIMUM SETTING AT
FULLY CLOCKWISE
POSITION
Resistance (K ohms)
4
5
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
1053
917
901
775
762
10
o
F
o
90
F
o
135
F
3
2
1
M133A
6
7
8
21573
21000
16553
16128
12812
12494
10000
9760
7869
7685
6238
6098
4982
4873
4006
3922
3244
3177
2643
2590
2166
2124
1786
1753
1481
1454
1235
1213
1035
1017
886
871
857
749
737
725
9
20445
15715
12185
9526
7507
5961
4767
3839
3112
2538
2083
1720
1427
1191
999
842
713
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