H.w. Flow Switch, Filter And Flow Limiter; Function; Checks; Removal Of The Flow Switch Sensor - Biasi RIVA ADVANCE HE M110.24SM/C Service Manual

14 D.h.w. flow switch, filter and flow
limiter
14.1

Function

The d.h.w. flow switch A in Fig. 14.1 is a device that
generates an electrical signal when hot water is drawn.
Fig. 14.1
When the flow rate through the d.h.w. circuit reaches
about 2,5 litres/min', the float 6 (Fig. 14.3) is drawn to-
wards the right.
The resulting magnetic field of ring 5 increases and re-
aches the flow switch sensor 1.
The sensor generates an electrical signal that switches
the boiler d.h.w operation ON.
The state of the sensor is also indicated by means of the
lamp B placed on the sensor body.
Fig. 14.2
14.2 Description and location of parts
(Fig. 14.3)
1 Flow switch sensor
2 Body
3 O---ring
4 Spring
5 Magnetic ring
A
B
C
6 Float
7 Threaded ring
8 Flow limiter (M110.28SM/... optional accessory)
9 Filter
10 Spring seat
Fig. 14.3
14.3

Checks

Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
Flow switch sensor operation
n
1 Remove the front panel of the case.
2 Switch on the boiler and open a d.h.w. tap. The
lamp B (Fig. 14.2) placed on the sensor body is
switched on when the flow rate reaches about 2,5
litres/min'.
14.4 Removal of the f
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
1 Remove the front panel of the case.
Disconnect the connector C (Fig. 14.2) and re-
2
move the sensor by delicately levering down-
wards with a screwdriver.
14.5 Removal of the flow switch group and
d.h.w. circuit filter
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
1 Remove the front panel of the case and empty the
d.h.w. circuit.
2 Remove the flow switch sensor (see section
14.4).
1
2
3
4
5
6
7
8
9
low switch sensor
29