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TEMPERATURE PRoBE
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.
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 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.
figure 15.2
c.h.
flow
c.h.
return
d.h.w.
inlet
d.h.w.
outlet
A
B
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 near the Temperature probe
and check the electrical resistance according to the graph in Fig-
ure 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. tem-
perature probe A - Figure 15.3.
4 Reassemble the c.h. temperature probe carrying out the re-
moval operations in reverse order.
figure 15.3
A
B
C
D
15.4 Removal of the d.h.w. Temperature probe
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.
2 Empty the d.h.w circuit of the boiler.
3 Remove the electric connector D and unscrew the d.h.w.
temperature probe B - Figure 15.3.
4 Reassemble the d.h.w. temperature probe carrying out the
removal operations in reverse order.
Warning: to lubricate the o-ring gaskets exclusively
use a silicone base grease compatible to be in con-
tact with foods and approved by the local water Au-
thorities.