Servicing
5
52
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 11S/19S/24S/24C • 02/2006
Buderus • http://www.buderus-domestic.co.uk
Subject to modifications resulting from technical improvements!
5.3.17 Checking the hot water / boiler sensor
z
Disconnect the plug-and-socket connection on the hot
water sensor cable (fig. 73, item 1) and/or the boilersensor
(fig. 73, item 2).
z
Measure resistance, take a temperature reading at the
thermal pressure gauge (tolerance ± 5 K) and compare
with the values listed in table 8. If there is any marked
mismatch, the hot-water sensor is defective.
z
If the hot water / boiler sensor is in order, plug it back in.
Table 8 Resistance values for hot water / boiler sensor
(approximate values)
Fig. 73 Checking the hot water / boiler sensor
Fig. 74 Boiler temperature sensor diagram
2
1
Temperature
[°C]
Resistance
[
Ω
]
0
29,490
.0
5
23,462
.0
10
18,787
.0
15
15,136
.0
20
12,268
.0
25
10,000
.0
30
8,197
.0
35
6,754
.0
40
5,594
.0
45
4,656
.0
50
3,893
.0
55
3,271
.0
60
2,760
.0
65
2,339
.0
70
1,990
.0
75
1,700
.0
80
1,458
.0
85
1,255
.0
90
1,084
.0
95
1,
939.6
100
1,
817.2
Fig. 75 Outside temperature sensor diagram
(°C)
R (
Ω
)
0
5
10
15
20
25
-20
-15
-10
-5
50,000
20,000
80,000
40,000
30,000
10,000
60,000
70,000
Outside temperature sensor