Temperature Probe; Function; Checks; Removal Of The C.h. Temperature Probe - Biasi Advance Plus 25C ERP Service Manual

15 TEMPERATURE PROBE

15 .1 Function

The Temperature probe has the function of converting the tem-
perature 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 two temperature probes. One on the out-
put of the primary condensing heat exchanger (C.H. temperature
probe) "A" in Figure 15.2 and Figure 15.3; one on the output of
the D.H.W. heat exchanger (D.H.W. temperature probe) "B" in
Figure 15.2 and Figure 15.4.
C.H.
return
Figure 15 .2
- 38 -
TEMPERATURE PROBE
A
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 C.H. temperature
probe) where the Temperature probe is located and check the
electrical resistance according to the graph in Figure 15.1.
15 .3 Removal of the C .H . Temperature probe
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 "C" and unscrew the C.H.
Temperature probes "A" (Figure 15.3).
4 Reassemble the C.H. Temperature probes carrying out the
removal operations in reverse order.
°C
Figure 15 .3
15 .4 Removal of the D .H .W . Temperature probes
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
B
Removal of the D .H .W . Outlet Temperature probe
1 Remove the front panel of the case and lower the control
D.H.W.
panel.
outlet
2 Empty the D.H.W. circuit of the boiler.
3 Remove the electric connector "E" (Figure 15.4)
4 Remove the fork "F" and pull the D.H.W. Temperature probe
"B".
5 Reassemble the D.H.W. Temperature probe carrying out the
removal operations in reverse order.
A
C
D