Buderus Logamax plus GB142-24 Servicing Instructions page 90

8 Actions
 Disconnect the plug and socket connection of the cable for the
sensor concerned.
 Test the resistance of the sensor concerned.
Supply sensor see fig. 14, pos. 1.
Return sensor see fig. 14, pos. 2.
Safety sensor see fig. 15, pos. 1.
 Measure the temperature near the sensor using a seconds
thermometer.
 Compare the values measured to the values in table 4 on the
next page. If the values differ, the sensor is broken.
 Reconnect the plug and socket connection if the sensor is OK.
 Fit the casing.
 Switch on the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "1" (On).
90 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
1
fig. 15 Checking the safety sensor
Temperature in
°F °C
32 0
41 5
50 10
59 15
68 20
77 25
86 30
95 35
104 40
113 45
122 50
131 55
140 60
149 65
158 70
167 75
176 80
185 85
194 90
203 95
212 100
table 4 Sensor resistance values (target values)
Resistance in
Ω
29,490
23,462
18,787
15,136
12,268
10,000
8,197
6,754
5,594
4,656
3,893
3,271
2,760
2,339
1,990
1,700
1,458
1,255
1,084
940
817