Page 23 from 76 6 720 814 719
SM FP_Australia 2017/04 EN
On the Picture 35 is presented the old terminal that is being replaced and the new one in the electrical cable
supply, so this cable will now always be supplied with new PCB.
Picture 35 – Old male terminal (left) and new male terminal (right)
4.11
Water Flow Sensor
Water flow is measured by a turbine flow sensor that is fed by a DC signal, proportional to the measured
water flow.
-
Flow rate to operate the appliance: 2 l/min
-
Flow rate to shut off the appliance: 1.6 l/min
Pict.36 – Motorized water valve (water flow stepper motor)
In case Q > 2 l/min following P
out
verification occurs:
- If P
out
> Minimum Power, the appliance will run with the calculated minimum water flow, in order to
reach the set point with a temperature stability of + / - 1ºC;
-
If P out < Minimum Power, In case expected T out > set point, burner will shut down.
Flow
[l/min]
Frequency
[Hz]
24
96
18
72
14
56
10
40
8
32
4
16
2
8
Table 12 – Water flow sensor values
