54
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Installation and Servicing Instructions Logamax plus GB142-24/30/45/60 • Version 12/2004
Buderus Hydronic Systems • http://www.buderus.net
Servicing
14
14.8 Replacing the supply/return/safety
sensors
z
Disconnect the heating system from the power
supply, remove the main fuse or switch off the circuit
breaker.
z
Set the main switch on the BC10 to "0" (Off).
z
Remove the casing.
z
Close the maintenance shut-off valves.
z
Drain the Logamax plus GB142.
z
Disconnect the plug and socket connection.
z
Unscrew the sensor concerned and replace it by a
new one.
Supply sensor see fig. 55, pos. 1.
Return sensor see fig. 55, pos. 2.
Safety sensor see fig. 56, pos. 1.
z
Restore the plug and socket connection.
z
Open the maintenance shut-off valves.
z
Purge air from the appliance.
Temperature
Resistance in
:
°F
°C
32
0
29,490
41
5
23,462
50
10
18,787
59
15
15,136
68
20
12,268
77
25
10,000
86
30
8,197
95
35
6,754
104
40
5,594
113
45
4,656
122
50
3,893
131
55
3,271
140
60
2,760
149
65
2,339
158
70
1,990
167
75
1,700
176
80
1,458
185
85
1,255
194
90
1,084
203
95
940
212
100
817
Table 13 Sensor resistance values (target values)
Fig. 55
Replacing the supply/return sensors
1
2
