Biasi M275V.2024 SM, Руководство по обслуживанию

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TEMPERATURE PROBE
15 NTC HEATING DELIVERY PROBE - NTC
MAXIMUM TEMPERATURE AND D .H .W .
TEMPERATURE PROBE NTC
15 .1 Function
The NTC probe has the function of converting the temperature
of the water in the hydraulic circuit where it is installed into an
electrical signal (resistance).
The relation between temperature and electrical resistance is
stated in Figure 15.1.
Figure 15 .1
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
6500
7000
7500
8000
8500
9000
9500
10000
10500
11000
11500
12000
12500
20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Ω
°C
On the boiler there are two temperature probes. One on the out-
put of the primary condensing heat exchanger (NTC heating de-
livery probe - NTC maximum temperature) "1" in Figure 15.2 and
Figure 15.3 and one on the output of the D.H.W. heat exchanger
(D.H.W. temperature probe NTC) "2" in Figure 15.2 and Figure
15.4.
Figure 15 .2
C.H.
flow
C.H.
return
D.H.W.
inlet
D.H.W.
outlet
1
2
15 .2 Checks
Temperature-resistance relationship
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
Disconnect the cable from the Temperature probe.
Measure the temperature of the pipe "3" (only NTC heating deliv-
ery probe - NTC maximum temperature) where the Temperature
probe is located and check the electrical resistance according to
the graph in Figure 15.1.
15 .3 Removal of the NTC heating delivery probe
- NTC maximum temperature
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Remove all the case panels and the sealed chamber lid.
2 Remove the electric connector "4" and the NTC probe "1"
(Figure 15.3).
3 Reassemble the NTC probe carrying out the removal opera-
tions in reverse order.
Figure 15 .3
3
1
4
15 .4 Removal of the D .H .W . temperature probe
NTC
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Remove the front panel of the case and lower the control
panel.
2 Empty the D.H.W. circuit of the boiler.
3 Remove the electric connector "5" (Figure 15.4)
4 Unscrew the NTC probe "2".
5 Reassemble the NTC probe carrying out the removal opera-
tions in reverse order.