H.w. Flow Switch, Filter And Flow Limiter; Function; Description And Location Of Parts - (Figure 14.2); Removal Of The Sensor - Biasi ActivA Plus Service Manual

D.H.W. FLOW SWITCH, FILTER AND FLOW LIMITER
14 D.H.W. FLOW SWITCH, FILTER AND FLOW
LIMITER

14.1 Function

7KH GKZ ÀRZ VZLWFK A in Figure 14.1 is a device that generates
an electrical signal when hot water is drawn.
Figure 14.1
:KHQ WKH ÀRZ UDWH WKURXJK WKH GKZ FLUFXLW UHDFKHV DERXW 
OLWUHVPLQ¶ WKH VHQVRU FORVHV WKH HOHFWULF FRQWDFW WKDW VZLWFKHV
the boiler d.h.w operation ON.
14.2 Description and location of parts - (Figure
14.2)
1 Flow switch plug
2 O-ring
3 Flow limiter (Activ A 30C. Activ A 35C. optional accessory)
4 %RG\ ZLWK ÀRZ PHWHU WXUELQH
5 Filter
1
2
3
Figure 14.2

14.3 Removal of the sensor

Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent.
Figure 14.3
A
1 Remove the front panel of the case.
2 Disconnect the connectors B and remove the sensor holder
3 Remove the sensor.

14.4 Checks

5
Figure 14.4
4
2
1 Remove the front panel of the case.
2 Don't disconnect the connectors B
3 Measure the electrical frequency at the leads of the sensor.
C (Figure 14.3).
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent.
Sensor operation
0..32 Hz
(without flow rate)
33..200 Hz
(witht flow rate)
wh = white
bu = blue
rd = red
:LWKRXW ÀRZ UDWH WKH HOHFWULFDO IUHTXHQF\ PXVW EH ÷32Hz.
:LWK ÀRZ UDWH WKH HOHFWULFDO IUHTXHQF\ PXVW EH ÷200Hz.
E
D
B
C
bu
wh
rd
B
5V
rd
bu
wh
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