H.w. Flow Switch, Filter And Flow Limiter; Function; Nomenclature And Location Of Parts; Checks - Biasi GARDA M90F.24S Service Manual

13 D.h.w. flow switch, filter and flow
limiter
13.1

Function

The d.h.w. flow switch A in Fig. 54 is a device that gener-
ates an electrical signal when hot water is drawn.
Fig. 54
When the flow rate through the d.h.w. circuit reaches
about 2,5 litres/min', the float 6 (Fig. 56) 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. 55
26
13.2
1 Flow switch sensor
2 Body
3 O---ring
4 Spring
5 Magnetic ring
6 Float
7 Threaded ring
8 Flow limiter (optional accessory)
9 Filter
10 Spring seat
A
Fig. 56
13.3
Warning: isolate the boiler from the mains
electricity supply before removing any
covering or component.
Flow switch sensor operation
n
B
1 Remove the front panel of the case.
2 Switch on the boiler and open a d.h.w. tap. The
lamp B (Fig. 55) placed on the sensor body is
switched on when the flow rate reaches about 2,5
litres/min'.
C 13.4
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. 55) and remove
2
the sensor by delicately livering downwards with
a screwdriver.

Nomenclature and location of parts

(Fig. 56)

Checks

Removal of the f
low switch sensor
1
2
3
4
5
6
7
8
9