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12 primary circuit flOw switch
12 .1 function
The Primary circuit flow switch (A in Figure 12.1) function is to
check the presence of water in the primary hydraulic circuit and
that the pressure is above the minimum.
b
figure 12 .1
This device is connected to the main electronic control p.c.b. and if,
it does not activate the control board will indicate that a fault condi-
tion (see section 4.1 of this manual) has occurred.
12 .2 checks
warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
Electrical check
It is possible to verify the general operation of the switch by
measuring the electric resistance between the contacts "bk" and
"wh" of the switch.
1 Measure the electrical resistance between the tabs "bk" and
"wh" (Figure 12.2).
The contact must close (resistance zero) with c.h. pressure of
0,35 bar or higher.
Primary circuit flow switch
a
rd
wh = white
bk = black
rd = red
figure 12 .2
12 .3 removal
warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Remove the front and right hand side panels of the case, turn
off the flow and return isolation valves and empty the primary
circuit.
2 Remove the fixing spring D (Figure 12.3) and remove the pri-
mary circuit pressure switch C.
3 Disconnect the connectors E (Figure 12.3).
c
d
figure 12 .3
4 Reassemble the primary circuit pressure switch in reverse
order of removal.
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 .
rd
5V
bk
wh
wh
The contact close
(resistance zero)
bk
with c.h. pressure of
0,35 bar or higher.
e
- 35 -
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