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15
TEMPERATURE PROBE
15 .1 Function
The Temperature probe has the function of converting the tempera-
ture 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 output
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 and Figure 15.4.
c.h.
return
Figure 15 .2
- 34 -
TEMPERATURE PROBE
A
c.h.
d.h.w.
flow
inlet
15 .2 Checks
Sensor operation
Warning: isolate the boiler from the mains electricity
supply before removing any covering or component .
Disconnect the cable from the Temperature probe.
Measure the temperature of the pipe C where the Tempera-
ture probe is located and check the electrical resistance ac-
cording to the graph in Figure 15.1.
15 .3 Removal of the c .h . temperature probe
Warning: isolate the boiler from the mains electricity
supply before removing any covering or component .
1
Remove all the case panels and the sealed chamber lid.
°C
Figure 15 .3
2
Remove the electric connector D and remove the c.h. Tempera-
ture probe A (Figure 15.3).
3
Reassemble the c.h. temperature probe carrying out the removal
operations in reverse order.
15 .4 Removal of the d .h .w . temperature probe
Warning: isolate the boiler from the mains electricity
supply before removing any covering or component .
B
Figure 15 .4
1
Remove the front panel of the case.
2
Empty the d.h.w circuit of the boiler.
3 Remove the fixing spring E (Figure 15.4).
4
Remove the electric connector F and unscrew the d.h.w. Tem-
perature probe B (Figure 15.4).
B
5
Reassemble the d.h.w. temperature probe carrying out the re-
moval operations in reverse order.
d.h.w.
outlet
Warning: to lubricate the O-ring gaskets exclusively
use a silicone base grease compatible to be in contact
with foods and approved by the local water Authorities .
F
E
A
D
C
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