Ntc Heating Delivery Probe - Ntc Maximum; Probe Ntc, D .H .W . Temperature Probe Ntc; Function; Checks - Biasi RINNOVA ADAPTIVE M300V.2025 SM Service Manual

15 NTC HEATING DELIVERY PROBE -
NTC MAXIMUM TEMPERATURE, C .H .
TEMPERATURE RETURN PROBE NTC,
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.
12500
12000
11500
11000
10500
10000
9500
9000
8500
8000
7500
7000
6500
6000
5500
5000
4500
4000
3500
3000
2500
2000
1500
1000
20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Figure 15 .1
On the boiler there are three temperature probes. One on the
output of the primary condensing heat exchanger (NTC heating
delivery probe - NTC maximum temperature) "A" in Figure 15.2
and Figure 15.3, one on the return of the primary condensing
heat exchanger (C.H. temperature return probe NTC) "B" in Fig-
ure 15.2 and Figure 15.4; one on the output of the D.H.W. heat
exchanger (D.H.W. temperature probe NTC) "C" in Figure 15.2
and Figure 15.5.
C.H.
return
Figure 15 .2
TEMPERATURE PROBE
A
B
C.H. D.H.W.
flow inlet

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 "D" (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 Empty the primary circuit of the boiler.
3 Remove the electric connector "E" and the NTC probe "A"
(Figure 15.3).
4 Reassemble the NTC probe carrying out the removal opera-
tions in reverse order.
°C
Figure 15 .3
15 .4 Removal of the C .H . temperature return
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.
C
2 Empty the D.H.W. circuit of the boiler.
3 Remove the electric connector "B" and the NTC probe "F"
(Figure 15.4)
D.H.W. 4 Reassemble the NTC probe carrying out the removal opera-
outlet
tions in reverse order.
D
E
A
- 39 -