Design Information, Underfloor Heating / Dhw Circulation - Wolf FGB-K Series Installation And Maintenance Instructions For Contractors

Underfloor heating system
If pipes which are impermeable to oxygen are used, an
underfloor heating system can be connected directly to a
heat source with up to 10 kW heating output, depending on
the system pressure drop.
Always install a temperature limiter for the underfloor heating
system to protect the pipes from overheating.
The output of the integrated pump should be increased if
underfloor heating is connected (parameters HG16 and
HG17). Recommendation HG16 Þ 75% and HG17 Þ 100%
For connection of an underfloor heating system with an
output requirement in excess of approx. 10 kW, a 3-way mixer
(accessories MM) and an additional pump are required.
Install a regulating valve in the return; this can be used to
reduce the excessive head of the additional pump if required.
Ensure the system user cannot adjust any
Please note
regulating valves.
When using pipes that are diffusion-proof to
oxygen, it is necessary to provide system
separation by means of a heat exchanger.
Inhibitors may not be used.
If an additional heating circuit is operated in parallel to the
underfloor heating system, it must be hydraulically matched
to the underfloor heating system.
NTC
Sensor resistances
3064458_201811
32. Design information, underfloor
heating / DHW circulation
Flow temperature sensor, cylinder temperature sensor, DHW outlet temperature
sensor, outside temperature sensor, return temperature sensor, flue gas temperature
sensor
Temp. °C Resist. Ω Temp. °C
-17 40810
-16 38560
-15 36447
-14 34463
-13 32599
-12 30846
-11 29198
-10 27648
-9 26189
-8 24816
-7 23523
-6 22305
-5 21157
-4 20075
-3 19054
-2 18091
-1 17183
0 16325
1 15515
2 14750
3 14027
4 13344
5 12697
6 12086
7 11508
8 10961
9 10442
10 9952
11 9487
12 9046
13 8629
14 8233
15 7857
16 7501
Fig: Underfloor heating system (example
For heating systems with plastic pipes, we recommend the
use of impermeable pipes to prevent the diffusion of oxygen
through the pipe walls.
When
Please note
conjunction with an underfloor heating system,
we recommend sizing the usable volume of a
diaphragm expansion vessel 20 % larger than
recommended by DIN 4807-2. An diaphragm
expansion vessel of insufficient size results in
oxygen ingress into the heating system, causing
corrosion damage.
Resist. Ω Temp. °C
17 7162 51
18 6841 52
19 6536 53
20 6247 54
21 5972 55
22 5710 56
23 5461 57
24 5225 58
25 5000 59
26 4786 60
27 4582 61
28 4388 62
29 4204 63
30 4028 64
31 3860 65
32 3701 66
33 3549 67
34 3403 68
35 3265 69
36 3133 70
37 3007 71
38 2887 72
39 2772 73
40 2662 74
41 2558 75
42 2458 76
43 2362 77
44 2271 78
45 2183 79
46 2100 80
47 2020 81
48 1944 82
49 1870 83
50 1800 84
operating the condensing
Resist. Ω Temp. °C
1733 85
1669 86
1608 87
1549 88
1493 89
1438 90
1387 91
1337 92
1289 93
1244 94
1200 95
1158 96
1117 97
1078 98
1041 99
1005 100
971 101
938 102
906 103
876 104
846 105
818 106
791 107
765 108
740 109
716 110
693 111
670 112
649 113
628 114
608 115
589 116
570 117
552 118
boiler in
Resist. Ω
535
519
503
487
472
458
444
431
418
406
393
382
371
360
349
339
330
320
311
302
294
285
277
270
262
255
248
241
235
228
222
216
211
205
93