IBC SL 30-175 Installation And Operating Instructions Manual page 50

Supply water temperature sensor
Return water temperature sensor
IBC Outdoor Sensor
10KΩ Temperature sensors
supplied with boiler (above)
See table #9 for resistance values
5-2
SL 30-175 MODULATING GAS BOILER
5.2
This section details the method for troubleshooting the non-standard electronic
components on the boiler including the electronic differential air pressure sensor
and the temperature sensors.
5.2.1 Temperature Sensors
The resistance of the temperature sensors varies inversely with temperature. To
test, measure the temperature of the sensed environment and compare with the
value derived from the measurement of the resistance (obtained by connecting a
good quality test meter capable of measuring up to 5,000 kΩ (5,000,000Ω) at the
controller end of the sensor lead).
To obtain a resistance reading, remove power to the boiler. For the supply water
and return water temperature sensors, remove the wire leads by disconnecting
their respective Molex connectors. Place multi-meter probes into sensor's female
Molex connector socket. Do not apply voltage to the sensor (damage may result).
TEMPERATURE
°F
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
Table 9: Temperature Sensor resistance values
RESISTANCE
°C Ω
-18 85,362
-15 72,918
-12 62,465
-9 53,658
-7 42,218
-4 39,913
-1 34,558
2 29,996
4 26,099
7 22,763
10 19,900
13 17,436
16 15,311
18 13,474
21 11,883
24 10,501
27 9,299
29 8,250
32 7,334
35 6,532
INSTALLATION AND OPERATION INSTRUCTIONS
TEMPERATURE RESISTANCE
°F °C
100 38
105 41
110 43
115 46
120 49
125 52
130 54
135 57
140 60
145 63
150 66
155 68
160 71
165 74
170 77
175 79
180 82
185 85
190 88
195 91
Ω
5,828
5,210
4,665
4,184
3,760
3,383
3,050
2,754
2,490
2,255
2,045
1,857
1,689
1,538
1,403
1,281
1,172
1,073
983
903