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TROUBLESHOOTING
SFC BOILER / WATER HEATERS - SFC 199
5.2.9 DHW Tank Sensor
The SFC series units allow the use of a tank sensor for controlling the domestic
hot water tank temperature. IBC Indirect water heaters come with a 10KΩ sensor.
An Aquastat can also be used.
If a field supplied domestic hot water sensor is used, it must be a 10KΩ sensor
matching the following table.
TEMPERATURE
RESISTANCE
°F
°C
0
-18
5
-15
10
-12
15
-9
20
-7
25
-4
30
-1
35
2
40
4
45
7
50
10
55
13
60
16
65
18
70
21
75
24
80
27
85
29
90
32
95
35
Table 16: Temperature Sensor resistance values – 10KΩ sensor
TEMPERATURE
Ω
°F
85,362
100
72,918
105
62,465
110
53,658
115
42,218
120
39,913
125
34,558
130
29,996
135
26,099
140
22,763
145
19,900
150
17,436
155
15,311
160
13,474
165
11,883
170
10,501
175
9,299
180
8,250
185
7,334
190
6,532
195
RESISTANCE
°C
Ω
38
5,828
41
5,210
43
4,665
46
4,184
49
3,760
52
3,383
54
3,050
57
2,754
60
2,490
63
2,255
66
2,045
68
1,857
71
1,689
74
1,538
77
1,403
79
1,281
82
1,172
85
1,073
88
983
91
903
5-5
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