Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
11 Technical documentation
83311002 1/2018-03 La
101-132
11 Technical documentation
11.1 Probe and sensor variables
DHW outlet sensor
Flow sensor
Flue gas sensor
Buffer sensor
De-couple sensor
Combustion air sensor
External sensor
DHW sensor (B3)
NTC 5 kΩ
NTC 600 Ω
NTC 12 kΩ
°C
Ω
°C
Ω
°C
Ω
-20
48 180
-35
672
-15
71 800
-15
36 250
-30
668
-10
55 900
-10
27 523
-25
663
-5
44 000
-5
21 078
-20
657
0
35 500
0
16 277
-15
650
5
27 700
5
12 669
-10
642
10
22 800
10
9 936
-8
638
15
17 800
15
7 849
-6
635
20
14 800
20
6 244
-4
631
25
12 000
25
5 000
-2
627
30
9 800
30
4 029
0
623
35
8 300
35
3 267
2
618
40
6 600
40
2 665
4
614
45
5 400
45
2 185
6
609
50
4 500
50
1 802
8
605
55
3 800
55
1 494
10
600
60
3 200
60
1 245
12
595
65
2 700
65
1 042
14
590
70
2 300
70
876
16
585
75
2 000
75
740
18
580
80
1 700
80
628
20
575
85
1 500
85
535
22
570
90
1 300
90
457
24
565
95
393
26
561
100
338
28
556
105
292
30
551
110
254
35
539
System pressure sensor
Return sensor
Combustion chamber pres-
sure sensor
bar
Volt
°C
Volt
mbar
Volt
0
0.5
0
0.5
0
0.5
1
1.25
25
1.25
2.5
1.0
2
2.0
50
2.0
5.0
2.0
3
2.75
75
2.75
7.5
2.6
4
3.5
100
3.5
10.0
3.5
